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Cutting Edge Unity AM, Manual

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The transformer will distort the waveform in a manner that will add to the amplitude of the signal.

This added amplitude becomes wasted modulation, since the peak of this signal must never exceed

the maximum modulation limit.

All is not lost! Within the Unity AM is an adjustment that will provide compensation to offset tilt that

can be generated by the transmitter. By creating a pre-distortion signal that is exactly opposite of the

distortion created by the transmitter, tilt can be reduced, if not eliminated. Refer to the following

example diagram.

 +

=

P

REDISTORTED

 

INPUT

 

SIGNAL

TRANSMITTER

 

RESPONSE

DESIRED

 

WAVEFORM

To accomplish the procedure, an audio generator and oscilloscope must be used. This adjustment is

also only available on the #8 low pass filter board. As with the symmetry adjustment, the top must be

removed.

Set the audio generator for 60Hz sine wave output and an operating level of +4 dBm. Connect this

signal to the input of the Unity AM. Set the following processing parameters to allow the audio signal

to activate the clippers. Set all Limiter Thresholds to 0%, and set the Clipper Drive to 100%. This

should create a clipped square wave at the output of the Unity AM. Modulate the transmitter at about

75% - 80% modulation. There is no need to operate at 100% modulation, and this will prevent

additional stress on tubes and transformers.

Set the oscilloscope to monitor the transmitter carrier signal. Synchronize the scope so that one or two

cycles can be observed. If the signal appears as the the desired waveform pictured in the above

diagram, then there is no tilt present, and no adjustment is necessary. If the waveform appears like or

similar to that as described as 

TRANSMITTER RESPONSE

 in the diagram, then adjustment in

needed.

Located on the #8 low pass filter board are four tilt adjustments, two per audio channel. One is

marked 

“FREQ”

, and the other 

“EQ”

.  Adjust each of the 

“FREQ”

 and 

“EQ”

 pots until the

observed signal matches the desired waveform diagram.  If the desired waveform can not be

achieved, adjust for the closest resemblance. Adjust each channel independently for stereo. When

finished, restore the processing parameters to a normal operating preset. 

Note:

 When using the Matrix

Processing Option, only use the left tilt adjustments for both 

FREQ

 and 

EQ

. The two right trim pots

should be set to the full counter-clockwise position.

With the completion of this test, and adjustment, maximum modulation can be efficiently achieved

with the Unity AM.

Summary of Contents for Unity AM

Page 1: ...1 Cutting Edge Unity AM Broadcast Processor Cutting Edge Technologies 2101 Superior Avenue Cleveland OH 44114 USA 216 241 3343 Fax 216 241 4103 Manual Version Preliminary AM 4 0 0 Jan 1995 ...

Page 2: ...too well how subjective audio processing is There is no right way or wrong way to do it As the sneaker manufacture Nike would say Just Do it I love the Can Do attitude We all know when it does not sound right but to just get it right can take quite an effort So as you proceed with the installation of our product I can only hope that you will approach this endeavor with an open mind patience and ti...

Page 3: ...s Bernie Kosar Dorothy Fuldhiem Billy Joel Roxette Chief Wahoo Dire Straits Jack Barnes Steve Pepe Wickliffe Sr High and the many many individuals who helped make this project a reality Kindest Regards Frank Foti Jan 1995 ...

Page 4: ...y to demonstrate some self control This manual is designed to first introduce you to the capabilities of the Unity AM and then clearly instruct you on its installation and operation Unlike most other manuals large sections don t even require you to be sitting in front of the product We hope you will take the time to read the manual We trust you will enjoy it and that it will provide you with new a...

Page 5: ...r Processing designed for the ears Feedforward control Quality versus loudness Keep and open mind Installation 21 Clarify your objectives Available time Installation considerations Installation checklist Mounting and connections Setting pre emphasis Rear panel connections Setting de emphasis Operation 32 The obvious The LCD display The jog wheel and buttons Security The real time clock Orientation...

Page 6: ...efore you make adjustments to the presets Modifying and adding presets Loading user added presets Updating user added presets Deleting user added presets Renaming user added presets Main Menu Reference 54 Leveler Menu Limiter Menu Clipper Menu Other Menu In Case of Difficulty Technical Descriptions 69 Troubleshooting Guide 81 Appendix 83 Remote Operation Worksheets Schematics ...

Page 7: ...gineering skills during the three years he spent at WHK WMMS He began to explore processing the art and science of enhancing audio and tailoring sound to fit programming needs It was here in Cleveland that Frank first tinkered with various processing theories and hot rodding existing audio components In 1981 Malrite shipped Frank west to be Chief Engineer at country formatted KNEW KSAN in San Fran...

Page 8: ... in the basement Frank knew what kind of processor radio demanded And in 1994 he delivered it The Unity AM Just what the world needs another audio processor Next to the fates and fortunes of local sports teams nothing causes more arguments at radio stations than processing In one corner there is the group who wants to burn a hole in the dial In this day of high octane Tastes Great Less Filling ext...

Page 9: ...as that the world did need another audio processor A device that has an open accurate sound over the full range of processing It took Frank a long time to get the Unity AM right The proof that he got it right is the way the Unity AM sounds A word about loudness Making this confession is a little like telling your parents you dented the car But here it goes It is OK for your station to be loud Very...

Page 10: ...ll find engineers programmers and managers happier than ever with their on air sound Today Cutting Edge is more than just Frank Foti While Frank is glad to have someone else build the boxes and keep the books he s still a busy guy And we don t mean spends the summers watching Cleveland Indian games No he is still working on new ways to improve the sounds of broadcast audio And he is still spending...

Page 11: ...ion Gone are mechanical switches and pots In their place are a button pad jog wheel and LCD screen Through user menus you can achieve better flexibility as well as rapidly store and retrieve settings In designing our user menus we have avoided creating too many layers that would require excessive navigation Most processes and functions are accessed in three steps and the menus are arranged in a lo...

Page 12: ...enly For heavier processing situations use of the phase rotators helps cut down on clipper induced distortion on voices For lighter processing requirements the phase rotators can be defeated 3 Selectable and adjustable low frequency Bass Enhancer circuit that provides a deep full and rich texture to the bass line This is not just another low frequency equalizer This section provides up to a 12dB b...

Page 13: ... to each Processor Leveler band to provide consistent peak control and low dynamic distortion Each limiter band operates in a fashion similar to the leveling scheme described above The exception is that the limiter bands deal predominately with peak level information and work at higher yet consistent ratios Each band is fed directly from the preceding leveler band Adjustment is available for attac...

Page 14: ...u require One port is located just after the Wide Band AGC and the other is between the Processor Leveler and Limiter Special Features All of the Unity AM s features can be accessed by an IBM compatible computer through the Serial Communications port With a modem connected to the computer you can control the Unity AM from virtually anywhere Compare processing settings in your home or even your car...

Page 15: ...g in natural content LRA on the other hand yields improved transparency in the presence and high frequency bands As the ear is more sensitive to fatigue and distortion in these ranges thanks to LRA the Unity AM sounds more musical Processing designed for the ears We won t pretend that we have the answers to all of the audio processing questions that exist in our industry But we do think that the e...

Page 16: ... or no peak energy LEVELERS LIMITERS FINAL LIMIT RMS Control Peak Control Clipping Figure This diagrams a simplified system that produces an RMS signal that will yield a high peak to average ratio The above illustrated system can produce both quality and quantity dBs of audio The perceived processing artifacts are minimized by the gentle qualitative operation of the RMS stage which the ear recogni...

Page 17: ...ping can sound overly aggressive or even offensive if used within the wrong stages of a processing system Later we will put this concept to use with respect to making adjusts of the parameters on the processing system Feedforward Control Vital to the great sound of the Unity AM is our use of feedforward control circuitry in all the dynamic processing functions i e the Wide Band AGC Multiband Level...

Page 18: ...e The gain element in a feedforward control scheme is a dumb device It only does what it is told to do by the control information and nothing more If the control circuits are able to develop the correct information then the gain element is capable of providing a very natural and smooth effect to the audio that is available over a wide operating range If the control circuits develop the wrong infor...

Page 19: ...ore fatiguing sound the harder it is driven with audio level This explains why these systems always will have a narrow sweet spot of operation that is usually ranges only a few dB This discussion may lead you to ask why feedforward control is not more prevalent The reason is in part to the difficulty in designing the needed control circuits within the true analog domain In order for this style of ...

Page 20: ...ns it is suggested that when making changes work with small 5 increments Keep an open mind The Unity AM is a different kind of processing system We realize that many of your views on audio processing are based upon your experiences with products with which you have previously worked You may find that the techniques and procedures that you have utilized up until the present may not create perform o...

Page 21: ...e a good deal of serious time to process your station We realize in our business today time is a precious commodity Our Unity AM and its competitors are expensive and multifaceted We hate to sound like we are nagging but don t try to install the Unity AM in between other major projects or the week your boss or your assistant is on vacation Make certain in advance that the staff members who helped ...

Page 22: ...dified the common response is that something is wrong Mic processing can be a very important part of your overall station sound 4 Operating Levels This is another simple area where trouble can develop Make sure the input and output levels of the Unity AM are at the operating at the proper level within your system Did you know that operating a processor with insufficient level into an STL system wi...

Page 23: ... it quit adjusting If it does not continue with this method until you re satisfied If the procedure is working you will find that each day the discrepancies are smaller and you re making fewer adjustments 9 When you get it where you like it STOP Nothing more said 10 Send in the second registration card Now we know who you are an how you are using the Unity AM A Word About Relative Phase If the rel...

Page 24: ...y AM is the modified 75µs NRSC standard The pre emphasis can be changed will relative ease Before going on to the next step be aware sophisticated microprocessor controlled products like the Unity AM do not like to be zapped by static electricity Please take all required precautions to create a static free environment before opening the Unity AM To change the pre emphasis locate and remove card 8 ...

Page 25: ...ns AC connection AC power is applied to the EIC style connector The Unity AM will operate from 100 to 240VAC Voltage selection is made using the jumper located in the fuse compartment of the AC connector assembly The default voltage shipped by the factory is 120VAC We may have changed the operating power setting at your request before shipping the unit ...

Page 26: ...io to the Unity AM you need to choose either 10dB or 4dB as your input operating level The factory default setting is 4dB If you want the input sensitivity to be configured for an input level of 10dB you will need to change some berg jumpers on the input board Before going on to the next step be aware sophisticated microprocessor controlled products like the Unity AM do not like to be zapped by st...

Page 27: ...ecific amount of pre emphasis is utilized to boost the high frequencies and then the corresponding de emphasis is used to reduce to the high frequencies to an overall flat response If there are two options what are the differences and why use them Good question In the first instance there is never any boost to the high frequencies Because of this any subsequent pre emphasis boost employed AFTER th...

Page 28: ...uses an emphasis technique for improved S N ratio Setting De emphasis The jumpers for the de emphasis options are located in the upper right hand corner of the Motherboard If you are facing the unit it would be the area to the right in the rear Position the jumpers as described in the following diagrams for the desired de emphasis X X X X X X X X X X X X AD 713 CONNECTOR JUMPERS JUMPERS UNITY MOTH...

Page 29: ...the Wide Band AGC and the other is between the Processor Leveler and Limiter Should you choose to install ancillary equipment through the interface ports we recommend that you first complete total installation of the Unity AM without the external device s This will allow you to set audio and processing levels that you can then maintain after adding your extra component The DB 25 connector labeled ...

Page 30: ...ctivated When you do your processing set up be sure to review the instructions for setting the return level from you external device to the Processor Leveler inputs Set the output level of the ancillary device to provide unity gain This will insure that the same amount of audio drive is provided to the multiband processors If the output gain of the ancillary device is too high the multiband proces...

Page 31: ...even with two networks in the Unity AM you have fewer than you had before Put the cover back on the Unity AM and place it back into service When you do you processing set up be sure to review the instructions for setting the return level from your external device to the Limiter inputs Serial Communication Port RS 232 RS 422 and RS 485 serial communication is available at the Serial Port Using a wi...

Page 32: ...S PARAMETERS CURRENT PRESET MENU LEVEL DAY DATE TIME ACCESS LEVEL INDICATOR STATUS SECTION LAYOUT OF LCD SCREEN Figure Layout of LCD Screen The Status Section provides current status of certain system functions CURRENT PRESET indicates the processing preset currently active MENU LEVEL indicates where you are in a particular menu hierarchy DAY OF WEEK DATE TIME ACCESS LEVEL indicates the security l...

Page 33: ...sed to store your settings The Escape button moves you up the menu system one step at a time until you reach the Home Screen The Escape button can be of great help when you are not certain to where in the menu system you have navigated Just a few presses on the button and you are back to the Home Screen Security Password Security Levels A this point you may be getting a little impatient You ve bee...

Page 34: ...the purpose of entering passwords use the top button for 1 the next button for 2 and so on down the row Changing Password Security Levels The first time you power up your Unity AM the Password Security Level will be set to 0 To access the Change Password Sub menu press the Enter button Next to the text NEW LEVEL the number 0 will appear reverse highlighted in a box on the screen The number will ma...

Page 35: ...sing the third fourth and fifth Clipping Stereo Generator and Composite Clipper Main Menu buttons one at a time in the indicated order Press the Enter button The level indicated in the Status Section of the LCD display should now be 3 and you will see a message that reads PASSWORD CORRECT LEVEL CHANGED You will have full access Press the Enter button to return to the Home Screen Changing passwords...

Page 36: ... erase all of your custom programming and processing settings And we mean all of your custom programming Hours and hours of processing decisions could be lost forever if you do not have a backup copy of your settings Remember this is a consequence of losing your password Hardware Initialization should only be used as a last resort Before going on to the next step be aware sophisticated microproces...

Page 37: ... it is press the Enter button and you will now see the sub menu From the Systems Options Sub menu locate the Clock Sub menu and turn the jog wheel until it is highlighted Press the Enter button and you will see the Clock Sub menu From the Clock Sub menu locate the Set Clock function and turn the jog wheel until it is highlighted Press the Enter button The current Real Time Clock setting will appea...

Page 38: ...e rules for the start and end dates or Daylight Savings Time will not change in your locality In the event that the daylight savings format be changed or different we have also provided access to the programming function so that it can be modified To turn on and set the Daylight Savings Time feature you should be in the Clock Sub menu If you are not in the Clock Sub menu start at the Home Screen p...

Page 39: ...ts You can switch from a Main Menu to another by just pushing a Main Menu button You may also move from a sub menu to a Main Menu by pressing a Main Menu button a few times until the desired Main Menu appears Let s move from the Leveler Main Menu The Unity AM saves you steps by allowing you to navigate directly between any two Main Menus Press the Clipping button We are now looking at the Main Men...

Page 40: ...meter Section of the LCD screen are at 50 If you have the Unity AM set for 10dB operation the 50 settings apply when a 10dB input is provided Remember that the Wide Band AGC will accommodate input levels that may be a little too high or a little too low For best Unity AM performance with lowest noise and processing artifacts you will want to set the input levels properly When you are finished adju...

Page 41: ...quickly and efficiently At this time take some time to Select the other Main Menus of the Unity AM We recommend that you do this to get a feel for the operation of the Unity AM Try to avoid changing too many of the setting just yet but do not worry if you do After the next section which describes the Processing Display we will use the factory processing presets to listen to audio through your Unit...

Page 42: ... This correlates to the meter returning to mid scale indication and unity gain of the Wide Band AGC The activity of the gate correlates to both a silence and noise gate function Any momentary or short term pauses in the audio will activate the silence gate function This function basically freezes the gain until the audio level exceeds the gate level again Then the processing action of the Wide Ban...

Page 43: ... the meter returning to mid scale indication and unity gain of the Leveler The Gate function operates exactly in the same manner as the procedure described above for the Wide Band AGC section Note When operating in the Matrix mode for stereo the left Gate indicator will indicate the status for the L R signal and the right indicator will reflect the Gate operation for the L R Since most stereo prog...

Page 44: ...ercials or music Music with passages of sustained level A good test example is the AEROSMITH CD PUMP This record has very little dynamic range Try any up tempo selection from this disk and you will see the LEVELER sections make initial adjustments along with small amounts of limiting Once adjusted the LEVELER sections will basically not move and limiting action will almost be non existent When the...

Page 45: ...ith the sonic integrity of the audio signal For this reason the LIMITER sections operate very quickly on an as needed basis Since these displays are capable of providing a wide range of information we do not recommend setting up this system to any specified amount of processing based upon meter indications Instead we recommend setting up the processing by using the ears to judge the sound and we p...

Page 46: ...pect that 100 of the Unity AM users will create added presets of their own Our presets range in operation from Classical which is probably the most tame most relaxed setting to CHR MODERN ROCK which is set for the most aggressive processing On initial power up the unit defaults to the A C Oldies preset This is indicated by the preset being named in the upper left hand corner of the Status Section ...

Page 47: ... you have selected You will need to set your output modulation in the Discrete Output Menu but at this point you should be able to go on the air If you want to work with the Unity AM off the air you may make initial adjustments using the audio output as it will indicate the effects of all of the Unity AM s processing Before you make adjustments to the presets At this point you may be ready to cust...

Page 48: ...nu rotate the jog wheel until the Preset List Sub menu is selected Press the Enter button Turn the jog wheel until you have highlight the ADD PRESET choice Press the Enter button and the ADD PRESET item will change to a highlighted bracket blank field The brackets indicate the maximum amount of space the name can be which is twenty characters The first character space in the field will be highligh...

Page 49: ...d RENAME appear on the right side of the screen A will appear next to the preset about to be modified This indicates that the preset is ready to be loaded but has not yet been loaded To load the preset turn the jog wheel until LOAD is highlighted and press the Enter button again All processing parameters are now set according to the preset you have loaded Notice that once you have selected a prese...

Page 50: ...modify Press the Enter button At this point you will see the words LOAD SAVE DELETE and RENAME appear on the right side of the screen A will appear next to the preset about to be delete To delete your preset turn the jog wheel until DELETE is highlighted and press the Enter button again The preset has now been deleted Renaming user added presets Any user preset can be deleted Factory presets may n...

Page 51: ...nform the Unity AM that you have reached the last character To do so turn the jog wheel until the carriage return symbol ø appears after the last character of your preset name This tells the Unity AM that you have completed the naming process The carriage return symbol is one character before the bank space near the end of the character list The fastest way to get to it is to turn the jog wheel in...

Page 52: ...ocated to the right of the LCD display INPUT LEVEL PHASE ROTATOR ON OFF WIDE BAND AGC ON OFF BASS ENHANCE CROSS OVER POINTS MIX LEVELS GATE LEVEL To select a particular menu item use the jog wheel to highlight your selection Push the Enter button to turn on off functions or to gain access items that represent sub menus Input Level Sub menu The right and left input gain of the Unity AM are individu...

Page 53: ...ne if you will someone that would continually insure that the output of the audio console was always within a specific level The platform leveling control circuit for the AGC is intelligent enough to know that if the incoming audio level is correct it will shut down its operation and wait until gain correction is needed The AGC is therefor only operating when needed eliminating the constant seekin...

Page 54: ...en The components that determine the shelf equalizer are mounted on a dip socket so that the contour of the enhancement can be altered if desired Contact Cutting Edge for details Crossover Points The phase linear 4 way adjustable Crossover Networks allow all processing to be tailored to any format requirement The crossover follows a 6dB octave slope This network provides perfect linearity as well ...

Page 55: ...to the Leveler Menu Limiter A multiple time constant Limiter is dedicated to each Processor Leveler band to provide consistent peak control and low dynamic distortion Each band is fed directly from the preceding Leveler band Adjustment is available for attack release and threshold levels for each Limiter band An output mix function allows contouring of the spectral levels that are sent to the subs...

Page 56: ...ms Threshold This sets the level at which the limiter will begin operation and is adjustable for all four bands This is not a drive control A high threshold level will yield less dynamic limiting little or no meter activity and allows more peak energy to pass to the Clipper stage that follows A low threshold level produces more dynamic limiting heavier meter activity and reduces energy to the Clip...

Page 57: ...cond patch point of the Interface Port this controls the return audio level to the multi band Limiter To adjust the Patch Point Input levels use the jog wheel to select the Patch Point Input Sub menu in the Limiter Menu Press the Enter button Use the Select buttons to highlight the left Patch Point Input level and use the jog wheel to adjust the bar graph to the desired level Again use the Select ...

Page 58: ...few that can not set from the front panel Since it is normally a one time only adjustment this should be performed during installation To adjust the symmetry remove the top cover Locate the Low Pass Filter board 8 It is the second board over from the right side of the unit when facing the front Located at the very front of board 8 is a twenty turn pot While monitoring the output adjust this contro...

Page 59: ... a clipped square wave at the output of the Unity AM Modulate the transmitter at about 75 80 modulation There is no need to operate at 100 modulation and this will prevent additional stress on tubes and transformers Set the oscilloscope to monitor the transmitter carrier signal Synchronize the scope so that one or two cycles can be observed If the signal appears as the the desired waveform picture...

Page 60: ...y need to enter two events Your first event is to start the preset change and the second will be to resume you previous format This may sound very obvious but is a step that can easily be forgotten Adding Events The Day part scheduling system is not active unit an event is added to the system This is accomplished through the Day part List Sub Menu in the Other Menu Use the jog wheel to highlight t...

Page 61: ...day and Preset of the event Just below the line ADD EVENT appears To add more events select this with the jog wheel and repeat the above procedure To create a Day part event using the Specific Date Format rather than the Sunday through Saturday Format detailed above the procedure varies slightly When you first press the Enter button after selecting ADD EVENT you will see SMTWTFS displayed Notice t...

Page 62: ...remote computer all front panel adjustments can be achieved This is accomplished with use of software designed to access the serial communications port Installation and usage of the remote software for the Unity AM is covered in a later section but very soon The Unity AM supports RS 232 RS 422 and RS 485 interfacing The pinout description at the front of this manual provides interconnect informati...

Page 63: ... bit slower but that is acceptable CONNECTION allows you to choose whether the Serial Port will be directly connected to your computer s Serial Port or will communicate with a remote computer via modem Use the jog wheel to select CONNECTION Press the Enter button until the desired status appears Your choices are DIRECT and MODEM Use the jog wheel to adjust another item in the sub menu or press Esc...

Page 64: ... the jog wheel to select the option desired and press ENTER The SCREEN SAVER DELAY can be useful in prolonging the life of the backlight and LCD screen This feature works like most screen saver options found on computer systems When there is no activity with the user interface beyond the selected time the screen will go dark Pressing any key will restore the operation of the LCD and backlight The ...

Page 65: ... mean all of your custom programming Hours and hours of processing decisions could be lost forever if you do not have a backup copy of your settings Re Init System should only be used as a last resort From the Other Menu use the jog wheel to select the System Options Sub menu and press the Enter button Use the jog wheel to select the Re Init System function and press the Enter button You are prese...

Page 66: ...ware loses control the Watchdog will reset the system in hopes of returning the operation to a normal level U708 is an UART which is used to establish serial communications with the microprocessor Jumper JP 1 sets the HARDWARE RE INITIALIZATION mode When the jumper is set in the normal position the CTS pin on the UART U708 is tied low When the jumper is the in INIT position the CTS pin is tied hig...

Page 67: ...ith any closure of the keypad that specific address line is read back into the system Depending which address is read will decode as to which button was pushed DIGITALALGORITHM The technique by which all dynamic processing is accomplished is known as Digital Sampled Analog This approach was chosen for two specific reasons First it is capable of exceptional audio performance Second it provides abso...

Page 68: ...ay or phase characteristics vary with frequency This feature is provided in an effort to create symmetrical waveforms associated with the human voice Most human voices are naturally asymmetrical This means that either the positive or negative half of the waveform is larger in amplitude than the other half The all pass network is designed to create a non linear time delay through the 300 2000 Hz fr...

Page 69: ...d level form U105B exceeds the reference level U106C goes to a low condition This opens U109B and enables NOR gates U107A and U107B for dynamic adjustment The integration time of C111 and R139 is set fairly fast This will allow the WB AGC to freeze during short term pauses in the audio signal This creates the silence gate A longer time constant is developed around R147 and C112 to form the noise g...

Page 70: ...h level change in incoming level to warrant any needed processing Whenever the present control signal and the incoming averaged signal are equal or close to equal their level will fall into the dead band area of the comparator When this occurs the outputs of comparators U106A B C are all low Since each state is low there is not any activity among the bilateral switches and no dynamic leveling is t...

Page 71: ... side CROSS OVERandDIGITALPROCESSORS Circuit Boards 3 6 Circuit boards 3 and 6 are essentially the same board Board 3 handles the initial cross over network and provides the multiband leveling audio path While 6 performs the limiting function and provides a second cross over necessary only when the second path point is utilized Since the technical description is similar only the 3 board will be di...

Page 72: ...ach other For board 3 these act as both EQ and individual band drivers for the following limiter sections For board 6 these act as the final spectral mix for the following clipper filter section Both the 3 and 6 boards provide two forms of output for the audio signal U217A B provides both a summing and balancing function so that wideband balanced audio can be provided This is used for the balanced...

Page 73: ... optimum low frequency modulation is achieved Refer to the discussion on page 54 of this manual for a detailed description MULTIBANDLEVELERANDLIMITERALGORITHMS The processing algorithms for leveling and limiting are performed on circuit boards 4 5 and 7 Boards 4 and 5 handle the multiband levelers 4 for left 5 for right Board 7 takes care of the multiband limiting For both leveling and limiting on...

Page 74: ...dow comparator exceeds the present control level a Decrease level or Decrement state is initiated What transpires is that the output of U304B will go low As long as the system in not in the GATE mode the output of U303B should also be low Both of these low states will cause the output of NOR gate U306 to go high This activates bilateral switch U308D that will then begin decreasing the gain of the ...

Page 75: ...e anything from DC to various widths of the 152 kHz signal This signal is then summed at AND gate U320 This creates the single bit digital signal to feed digital gain cell on board 3 MULTIBANDLIMITERS Circuit Board 7 The MULTIBAND LIMITERS operate much in the same manner as the LEVELERS except instead of controlling the RMS level they will be operating on the PEAK level Feed forward in design the ...

Page 76: ...ter clock for the signal processor sections This clock signal feeds both the LOG PROCESSOR module and the AC couple pulse generator These are the respective signals used with the control signals on boards 2 4 5 and 7 to generate all dynamic processing functions InCaseofDifficulty Should you encounter problems with the Unity AM do not fret Most problems can be diagnosed with the following Troublesh...

Page 77: ...heck DS 1232 U705 on PCB 1 verify PS 5V is within 5 of supply voltage FRONT PANEL BUTTONS DO NOT OPERATE loss of any or all of U9 U11 U12 FRONT PANEL BARGRAGHS DO NOT WORK loss of LED 25V supply loss of A D on PCB 1 ADC0819 sometimes this chip loses memory and just needs to be reseated by removing and re inserting loss of any or all of the following matrix decoding chips U1 U2 U3 U4 U5 U8 U9 U10 U...

Page 78: ...istortion will be created if limiter mix levels are too high distortion will be created if Threshold levels are too low on limiter dist can happen failure of distortion control module check waveforms on PCB 8 ALL ADJUSTABLE FUNCTIONS ARE ERRATIC verify DQ CLK trace connections on Motherboard check PIA s on PCB 1 verify that DQ CLK are present through the system possible shorted DS 1267 that causes...

Page 79: ... The host software is able to automatically acknowledge either a Unity AM 2000i FM processor or a Unity AM AM processor By creating a common host software package it allows the user to have the ability to communicate with either system The software has been designed to automatically create only those needed screen options for whichever system is being utilized Remote operation can be configured in...

Page 80: ...e COPY C then hit the Enter key The computer should copy the program files and put them into the C Unity directory To verify this Select the hard drive by typing C and then Enter The screen should change to C Unity on the display Use the DOS DIR to check the directory This completes the installation of the software Setup Starting the remote software is easy For hard disk users make sure you are in...

Page 81: ...TRANSMITTER 555 1003 Y 2 MASTER CONTROL 9 555 8931 N 3 WCET 555 9825 Y 4 _______________________________ ____________________________ ______ 5 _______________________________ ____________________________ ______ 6 _______________________________ ____________________________ ______ 7 _______________________________ ____________________________ ______ 8 _______________________________ _______________...

Page 82: ...e number will now be displayed in the Telephone Number field on the dialing directory The File Save column on the dialing directory indicates if the selected location has saved the operational settings This is shown with a Yor a N in the column This feature is not accessed from the directory but from the system once connection is made Operation of this feature is discussed later The above diagram ...

Page 83: ...ions menu Use the jog wheel to select Note that for 9600 baud modem operation there are additional options that have been customized to particular modems These should only be selected for those specific listed models If your model is not listed use the generic 9600 baud setting if you are trying to operate at this speed Now the STATUS option can be activated Scroll to the STATUS field and press EN...

Page 84: ...Upon connection the computer will display the Leveler screen If the connection is not made a beep will be heard from the computer If unable to connect check all software settings and hardware connections options and try again If using a modem press the F1 key After completing the dialing procedure and connecting the computer will ask for a password Once connection has been made the system will tak...

Page 85: ...oard PIN 2 PIN 3 PIN 5 PIN 2 PIN 3 PIN 5 DB 9 CON NE CTO R TO UN ITY DB 9 CON NE CTO R TO COM PUTER M ODEM RS 232 SERIAL CABLE CONFIGURATION DB 9 TO DB 9 PIN 2 PIN 3 PIN 5 PIN 2 PIN 3 PIN 7 DB 9 CON NE CTO R TO UN ITY DB 25 CON NE CTO R TO COM PUTER M ODEM RS 232 SERIAL CABLE CONFIGURATION DB 9 TO DB 25 Operation Basic operation is achieved by using the following keys TAB Allows movement from one ...

Page 86: ... ENTER keys will be used For most changes the screen will prompt you on which keys to use This prompt will appear just above the menu bar F4 Presets Pressing F4 will display the preset menu screen Use the ARROW keys to select the desired preset and press ENTER The selected preset will be displayed just below the menu bar in the field marked Unity AM PRESET If adding a preset select ADD PRESET and ...

Page 87: ...ocation in the dialing directory Option B will upload any settings that have previously been saved in the dialing directory into the Unity AM This option will also prompt for conformation Upon doing so the computer will then upload all stored settings and overwrite whatever parameters were within the system Selecting option C will erase the dialing directory Any and all Unity AM Locations Telephon...

Page 88: ...arily frozen and all keyboard activity is defeated Once a GOOD condition returns to the screen all operation is resumed to normal operation F10 Freeze Meters Used as a utility function pressing F10 will freeze the metering displays at the present indication This completes the installation setup and operation instructions for the Unity AM remote software It is recommended that before full usage in ...

Page 89: ...ral Low Mid Presence High Bass Enhance 25 Crossover Frequencies 250 1002 3019 Leveler Mix Levels 75 75 60 65 Gate Level 15 Limiter Attack Time 70 60 40 60 Limiter Release Time 55 60 60 40 Threshold Levels 55 50 40 75 Limiter Mix Levels 50 50 45 45 Clipper Drive 40 BYPASS General Low Mid Presence High Bass Enhance 0 Crossover Frequencies 200 1002 3019 Leveler Mix Levels 50 50 50 50 Gate Level 15 Li...

Page 90: ...er Release Time 20 20 20 20 Threshold Levels 55 50 35 75 Limiter Mix Levels 50 50 45 45 Clipper Drive 30 COUNTRY General Low Mid Presence High Bass Enhance 25 Crossover Frequencies 250 1002 3019 Leveler Mix Levels 75 75 50 60 Gate Level 15 Limiter Attack Time 70 60 40 60 Limiter Release Time 60 50 40 50 Threshold Levels 55 50 40 75 Limiter Mix Levels 50 50 45 45 Clipper Drive 40 JAZZ NEW AGE Gener...

Page 91: ... High Bass Enhance 35 Crossover Frequencies 200 1002 3019 Leveler Mix Levels 70 70 55 60 Gate Level 15 Limiter Attack Time 70 60 40 65 Limiter Release Time 75 60 50 50 Threshold Levels 55 50 40 75 Limiter Mix Levels 50 50 45 45 Clipper Drive 40 URBAN General Low Mid Presence High Bass Enhance 65 Crossover Frequencies 200 1002 3019 Leveler Mix Levels 80 70 50 60 Gate Level 15 Limiter Attack Time 70...

Page 92: ...Levels Clipper Drive ITEM General Low Mid Presence High Bass Enhance Crossover Frequencies Leveler Mix Levels Gate Level Limiter Attack Time Limiter Release Time Threshold Levels Limiter Mix Levels Clipper Drive ITEM General Low Mid Presence High Bass Enhance Crossover Frequencies Leveler Mix Levels Gate Level Limiter Attack Time Limiter Release Time Threshold Levels Limiter Mix Levels Clipper Dri...

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