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Model 760-03/77 User Guide

Issue 4, October 2016

Studio Technologies, Inc.

Page 55

for Surround

The following provides a summary of the action performed when the downmix modes
are active. Signals at unity gain unless noted. 1 = 0 dB; 0.707 = –3 dB; 0.5 = –6 dB;
0.35 = –9 dB; 0 = full attenuation.

Surround to Stereo

L = (1 or 0.707)L + (0.707 or 0.5)C + (0.707 or 0.5)LS +(0 or 0.5)LFE
R = (1 or 0.707)R + (0.707 or 0.5)C + (0.707 or 0.5)RS + (0 or 0.5)LFE
C, LFE, LS, and RS monitor outputs mute

Stereo to Mono

With a stereo input selected the result is:
C = 0.707L + 0.707R
L, R, LS, RS, and LFE monitor outputs mute
With a surround input selected the surround to stereo downmix function automatically
enables resulting in:
C = (0.707 or 0.5)L + (0.707 or 0.5)R + (0.707 or 0.5)C + (0.5 or 0.35)LS
+ (0.5 or 0.35)RS + (0 or 0.5)LFE

Appendix C—Downmix Formulas

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Содержание 760-03

Страница 1: ...Model 77 Control Console User Guide Issue 4 October 2016 This User Guide is applicable for systems consisting of Model 760 03 serial number M760 03 00151 and later with software version 4 20 and higher and FPGA version 4 15 and higher Model 77 serial number M77 00151 and later with software version 4 20 and higher for Surround ...

Страница 2: ...This page intentionally left blank ...

Страница 3: ...gies Inc Page 3 for Surround Table of Contents Revision History 4 Introduction 5 Installation 9 Conﬁguration 17 Operation 39 Technical Notes 46 Speciﬁcations 50 Appendix A Connection Pin Out Charts 52 Appendix B Sync Input Sources 54 Appendix C Downmix Formulas 55 ...

Страница 4: ...016 Revised text for error codes Err1 Err2 and Err3 added text for error code Err4 Issue 3 April 2015 Revised speciﬁcations to reﬂect ﬁnal audio performance measurements Issue 2 January 2015 Text clariﬁcations Reﬂects ﬁnal product nomenclature Model 760 03 Model 77 Issue 1 April 2014 Initial release as Model 76DA 110 Model 77 ...

Страница 5: ... s command center and is designed to reside at a user s location allowing ﬁn gertip selection of all monitoring functions Numerous LED indicators provide com plete status information A 4 digit numeric display indicates the post fader monitor output level in real time A major strength of the Model 77 is its ability to conﬁgure under software control many important operating parameters Intended for ...

Страница 6: ...r surround digital monitor out put can be used with metering systems that require signals that aren t impacted by level control or other monitoring functions The stereo input C direct digital monitor output allows an installation to directly access the SRC capabilities The digital monitor out puts are compatible with equipment that re quires balanced AES3 digital audio signals with an output imped...

Страница 7: ... and analog monitor output signal connections are made using two 25 pin female D subminiature connectors One 9 pin female D subminiature connector is used to connect the Model 760 03 with up to four Model 77 or Model 71 Control Consoles A second 9 pin female D sub connector is used to interface with remote control signals AC mains power is con nected directly to the Model 760 03 with an acceptable...

Страница 8: ... monitored Multiple channels can also be simultane ously selected for muting or soloing A special solo mode is also provided called channel pop solo which offers a unique aid when monitoring audio material Chan nel pop solo allows the level of a single post fader digital and analog monitor out put channel to be raised while the level of the other channels is reduced This helps to emphasize the con...

Страница 9: ... Any additional Model 77 or Model 71 Control Consoles will be shipped in separate cartons Mounting the Model 760 03 The Model 760 03 Central Controller re quires one space 1U in a standard 19 inch 48 3 cm equipment rack Secure the Model 760 03 into the equipment rack using two mounting screws per side Select a location that is convenient for making connections to the audio signals as well as inter...

Страница 10: ...ature connector On the Model 760 03 stereo input C uses a 3 pin female XLR connector for interfac ing with a digital audio signal source The mating cable should have a 3 pin XLR connector wired such that signal goes to pin 2 the signal to pin 3 and shield to pin 1 Unbalanced AES3 digital audio signals can also be used with the Model 760 03 s inputs if external coupling transformers baluns are util...

Страница 11: ...o signals this allows support for 16 audio channels eight interfaces each supplying two audio channels A wiring assembly prepared for the Model 760 03 s monitor outputs would typically be identical to that of a TASCAM type output assembly An assembly of this type would have a 25 pin male D subminiature connec tor DB 25M on one end and eight 3 pin male XLR connectors on the other For compatibility ...

Страница 12: ...r outputs The surround analog monitor output chan nels are intended to connect to analog inputs associated with the surround loud speaker system incorporated in a facility The stereo analog monitor output allows support for a secondary set of stereo monitor loudspeakers The analog monitor output channels are designed for connection to audio ampliﬁers associated with monitor loudspeakers or to the ...

Страница 13: ...o equipment however the importance of this type of sync seems to be waning Both bi level and tri level signals can be found at numerous rate combinations conﬁgured to allow for com patibility with the various video formats With the wide range of allowable sync sources proper Model 760 03 operation should be easy to obtain Extensive testing has been done using many different sync source types and r...

Страница 14: ...his is used to interface the unit with Model 77 Control Consoles Refer to Figure 8 or Appendix A for details A 9 pin female D sub connec tor labeled To From Central Controller is provided on the back panel of each Model 77 Control Console A cable with 9 pin male D sub DE 9M connectors on each end is used to interconnect the Model 760 03 with the Model 77 units A cable is included in the shipping c...

Страница 15: ...support the desired interconnection length Calculate the volt age drop by multiplying the total resistance in ohms of the proposed cable by 0 1 the Model 77 s required current in amperes Remember to include the resistance in both the DC and DC wires when calculating the voltage drop If it s greater than 3 V your cable is too long or the wire gauge is too small Additional Control Consoles Some inst...

Страница 16: ...nds initial system operation will commence and the two LEDs will perform their intended func tions Once operating data is being inter changed with the one or more connected Model 77 or Model 71 Control Consoles the control console status LED will also light The sync status LED will light if a valid sync source has been recognized The sync status LED will ﬂash if a valid sync source is not recogniz...

Страница 17: ...ntrol Consoles Conﬁgurable Parameters Many StudioComm functions can be con ﬁgured to meet the exact needs of an installation A Model 77 Control Console is used to display and select the desired system conﬁguration Here s an overview of what can be conﬁgured Model 77 Device Address must be unique for each unit Stereo Input C Sample Rate Converter Post Fader Stereo Digital and Analog Monitor Output ...

Страница 18: ...ing the system s operating parameters to achieve the desired performance The conﬁguration data is stored in nonvolatile memory which is rated for thousands of read and write cycles and a retention time in tens of years Note that memory integrat ed circuits are located in the Model 760 03 Central Controller as well as the Model 77 and Model 71 Control Consoles The in dividual device address is stor...

Страница 19: ...ttings are simple to make great care must be taken in ﬁrst reviewing the entire monitor system Only after a full understanding of the performance of the associated sur round and if present stereo loudspeaker systems are determined can a plan for bass management be established Bass management can be enabled so that the function is active when the surround post fader monitor outputs are enabled It c...

Страница 20: ...s selected a 75 ohm load is applied to the signal When the sync input is not terminated the input im pedance is very high essentially applying no load to the source If the sync source is connected only to the Model 760 03 then enabling termination is typically appropriate However if the sync source is being shared by multiple inputs then care must be taken so that the signal is only ter minated by...

Страница 21: ...again become active Conﬁrm that the correct level has been stored by pressing the reference level button The SPL meter should display the desired level If not repeat the calibration procedure to achieve the desired goal You might wonder why you have to press and hold the reference level button for ﬁve seconds before the selected value is recognized This is provided speciﬁcally so that unauthorized...

Страница 22: ... dB relative to the post fader monitor outputs current level There are four dim level values available 10 0 15 0 20 0 and 25 0 dB Remote Mute All Two conﬁguration choices are associated with the remote mute all function disabled and enabled To utilize the remote mute all function simply requires you to select the enabled setting Remote Dim Two conﬁguration choices are associated with the remote di...

Страница 23: ...he surround to stereo downmix func tion is active the level of the L and R inputs remain at unity with no gain or loss applied An alternate setting allows the level of L and R input channels to be reduced attenuated by 3 dB The available chang es in signal level can also be notated as 0 dB or 3 dB When the surround to stereo downmix function is active the left surround LS in put is routed to the l...

Страница 24: ...s active in the channel pop solo mode Refer to Figure 11 for details Post Fader Digital and Analog Monitor Output Level Offsets To provide assistance during room cali bration the relative output levels of the post fader surround and stereo digital and analog monitor output channels can be ad justed over a limited range The eight chan nels can be adjusted in 0 5 dB steps over a 12 dB range During c...

Страница 25: ...for two seconds places this speciﬁc unit in its conﬁgura tion mode normal operation of the Model 760 03 and other connected Model 71 and Model 77 units will continue When a Model 71 enters its conﬁguration mode its three LEDs will no longer perform their usual functions Instead the status LED will blink to indicate that conﬁguration mode is active Refer to Figure 9 for details Device Address The d...

Страница 26: ...urn the buttons to normal operation simultaneously press and hold both buttons for two seconds at which time the two LEDs will ﬂash rapidly To leave the conﬁguration mode and return a Model 71 to normal operation requires one last action again press and hold its conﬁguration button for two seconds The selected conﬁguration parameters will be stored in a nonvolatile memory device that is located in...

Страница 27: ...dio Technologies Inc Page 27 for Surround Conﬁguration Entering and Exiting Conﬁguration Mode Press and hold the conﬁguration button for 2 seconds to enter or exit the conﬁguration mode These LEDs will light alternately when conﬁguration mode is active ...

Страница 28: ...te Solo button to display and conﬁgure the Model 77 s device address stereo input C sample rate converter and post fader stereo monitor output Use the Level control to change this speciﬁc Model 77 s device address Address can be either A1 A2 A3 or A4 See Note below These LEDs display the status of the post fader stereo monitor output function When LED Surround is lit the function cannot be enabled...

Страница 29: ...f the surround output bass management LED lit means surround output bass management enabled LED not lit means surround output bass management disabled Use the button to change the conﬁguration See Note below This LED displays the conﬁguration of the stereo output bass management LED lit means stereo output bass management enabled LED not lit means stereo output bass management disabled Use the but...

Страница 30: ...32 44 1 48 88 2 96 176 4 and 192 kHz This LED displays the conﬁguration of the sync input termination LED not lit means sync input is not terminated LED lit means termi nated with 75 ohms Use the button to change the conﬁguration Use these buttons to select the sync source LED Surround B lit means sync input video LED Stereo A lit means sync input DARS LED Stereo B lit means sync input word clock ...

Страница 31: ...eference level will not be accidently changed To permanently store the new value you must still exit the conﬁguration mode Conﬁguration Reference Level Press and hold the Reference Level button for 5 seconds to take a snapshot of the level control s setting at the time conﬁguration mode was entered The Reference Level LED will ﬂash when the button is initially pressed and then light steadily when ...

Страница 32: ...in dB SPL Press and hold the Mute All button to display and set the overall display mode the reference level in dB SPL and auto reference level off When the Mute All button is pressed use the Channel Mute Solo L and R buttons to select the overall display mode LED L lit means attenuation mode is selected LED R lit means SPL mode is selected Use the buttons to change the conﬁguration When the Mute ...

Страница 33: ... Remote dim enabled This LED displays the conﬁguration of remote mute all LED not lit means remote mute all is disabled LED lit means enabled Use the button to change the conﬁguration This LED displays the conﬁguration of remote dim LED not lit means remote dim is disabled LED lit means enabled Use the button to change the conﬁguration Use these buttons to select dim level LED Surround B lit means...

Страница 34: ...Press and hold the Surround to Stereo button to display and conﬁrm the surround to stereo downmix levels and pre fader surround monitor output mode These LEDs display the conﬁguration of the pre fader surround monitor output mode LED L lit means output channels are pre downmix LED R lit means output channels are post downmix Use the buttons to change the conﬁguration Use these buttons to select th...

Страница 35: ...set level When the Surround A button is pressed use the level control to adjust the channel pop solo up offset level The range is 0 0 to 12 0 in 0 5 dB steps When the Surround B button is pressed use the level control to adjust the channel pop solo down offset level The range is 0 0 to 12 0 in 0 5 dB steps and full mute Full mute is selected by adjusting the level control past 12 0 at which point ...

Страница 36: ...ms for both A and B Press and hold the Stereo A button to display and select input delay A Press and hold the Stereo B button to display and select input delay B Use the level control to adjust the input delay Range is from 0 to 340 The display shows delay in milliseconds at 48 kHz sampling rate The value is scaled up or down for other sample rates ...

Страница 37: ...put level offsets The range is 12 0 to 12 0 in 0 5 dB steps Press and hold both the L and Surround Stereo buttons to conﬁgure the stereo L level offset Press and hold both the R and Surround Stereo buttons to conﬁgure the stereo R level offset Press and hold the R button to conﬁgure the surround R level offset Press and hold the C button to conﬁgure the surround C level offset Press and hold the L...

Страница 38: ...0 dB post fader monitor output level Attenuation display mode selected 85 0 dB SPL reference level Auto reference level off disabled 20 dB dim level Warning Each Model 77 unit must have a unique address Restoring factory defaults will reset only this speciﬁc Model 77 to device address A1 If another connected unit is already conﬁgured for address A1 normal system operation will stop Note The 5 seco...

Страница 39: ...ol Consoles StudioComm for Surround operation is controlled using the up to four Model 77 or Model 71 Control Consoles that have been connected Two system functions can also be controlled by means of the remote control inputs Model 77 Control Console To make things easy to describe the Mod el 77 s operator functions are divided into six main groups input source selection downmix monitor output gen...

Страница 40: ...reo downmix function is en abled this condition will be remembered when switching to one of the stereo input sources Upon returning to surround input A the surround to stereo downmix function will again become active For details on the exact actions performed by the downmix functions refer to Appendix C at the end of this user guide Surround to Stereo When the surround to stereo downmix function i...

Страница 41: ...surround stereo monitor output select button is also used to display the system s current sample rate value Pressing and holding the surround stereo button will cause the current sample rate value to be displayed 32 0 44 1 48 0 88 2 96 0 176 4 or 192 0 This can be useful during troubleshooting or just for general interest Once the button is released normal display operation will resume Reference L...

Страница 42: ...st fader monitor output level reduction will apply no matter whether the level is being set by the rotary level control or by the reference level button The LED associated with the dim button will light whenever dim is active If dim mode is enabled via the remote dim function the dim LED will ﬂash It s worth using a few sentences to dis cuss the auto dim off function Whenever dim is enabled due to...

Страница 43: ...ty The channel mute solo mode button allows the user to select between the mute and solo functions Going from mute mode to solo mode or vice versa clears all active mutes or solos Pressing the mode button twice is a legitimate means of quickly clearing muted or soloed channels To mute or solo a channel simply requires pressing one of the channel mute solo buttons The buttons function in a press to...

Страница 44: ...ew and change the solo mode and input delay settings This LED displays the current setting of the solo mode LED not lit means normal LED lit means channel pop Press the button to change the mode This LED displays the current setting of the input delay LED not lit means input delay A is selected LED lit means input delay B is selected Press the button to change the setting The display shows the cur...

Страница 45: ...4 digit display whenever a channel is actively being soloed in the channel pop solo mode This ensures that a user will understand that the post fad er monitor outputs no longer represent the true inter channel level relationships Remote Control Inputs As previously discussed in the Installa tion section of this user guide two remote control signals can be connected to the Model 760 03 and then con...

Страница 46: ...ion has been disabled The associ ated LED will ﬂash brieﬂy but no operating change will occur The LED will continue to display the status of the reference level function as selected by other Model 77 and Model 71 units Technical Notes Loss of Sync The Model 760 03 relies on an external tim ing reference sync source for proper op eration This can be in the form of an AES3 word clock DARS AES11 bi l...

Страница 47: ...audio black in preparation for a complete loss of signal Electromechanical relays associated with the analog monitor outputs will change to their mute state to minimize the chance of signal transients reaching the connected loudspeaker inputs Power Up Messages Upon mains power being applied to the Model 760 03 all connected Model 77 units will go through a power up sequence The sequence starts by ...

Страница 48: ...abilities of the Model 760 03 s SRC function is stated in this way the sample rate of an input signal can range from 1 6 to six times the Model 760 03 s output sample rate with the additional restriction that it must be no less than 8 kHz and no more than 216 kHz The Model 760 03 s output sample rate is determined by the selected timing reference sync signal and if required a conﬁgured value If a ...

Страница 49: ...roblem relocating one or more Model 77 or Model 71 Control Consoles while the StudioComm system is operat ing You can disconnect the 9 pin intercon necting cable move the unit or units and then reconnect without issue Upon discon nection of all control consoles the Model 760 03 Central Controller will mute the internal digital audio channels as well as saving the current operating parameters No cl...

Страница 50: ...d AES3 110 ohms 5 Vpp Connector 25 pin female D subminiature DB 25F AES59 2012 compliant Analog Monitor Outputs 8 Conﬁguration organized as one surround 5 1 and one stereo 2 channel Type electronically balanced source impedance 200 ohms Nominal Level 4 dBu 20 dBFS input source and level control at maximum setting Maximum Level 24 dBu into 2000 2 k ohms or greater Frequency Response Digital Inputs ...

Страница 51: ...our Model 77 Control Con soles can be connected to a Model 760 03 Central Controller Power 12 Vdc nominal 9 Vdc minimum maxi mum current 100 mA provided by Model 760 03 Central Controller Control Data Type RS 485 Data Rate Format 115 2 kbit s 8 N 1 Connector 9 pin female D subminiature DE 9F Dimensions Overall 7 20 inches wide 18 3 cm 2 20 inches high 5 6 cm 5 40 inches deep 13 7 cm Weight 1 7 pou...

Страница 52: ...ignal Signal Connections Channel High Low Shield Surround Input A L R 1 24 12 25 Surround Input A C LFE 2 10 23 11 Surround Input A LS RS 3 21 9 22 Stereo Input A 4 7 20 8 Surround Input B L R 5 18 6 19 Surround Input B C LFE 6 4 17 5 Surround Input B LS RS 7 15 3 16 Stereo Input B 8 1 14 2 Notes 1 All signals transformer coupled digital audio balanced AES3 110 ohms 5 Vpp compatible 2 Connector ty...

Страница 53: ... 485 6 To From Models 77 71 Data Shield 2 To From Models 77 71 DC 12 V 4 To Models 77 71 DC 12 V Return 9 To Models 77 71 DC Power Shield 5 To From Models 77 71 Note Connector type on Model 760 03 is 9 pin female D subminiature DE 9F Connector uses 4 40 threaded inserts for locking with mating plug Connections between Model 760 03 and Model 77 and Model 71 ...

Страница 54: ...2 kHz DARS AES11 or AES3 Signal with sample rate of 32 44 1 48 88 2 96 176 4 or 192 kHz Bi Level and Tri Level Video See table below Video Format Video Format continued NTSC Black Burst 1035i 59 98 Hz PAL Black Burst 1035i 60 Hz 525i 59 94 Hz 1080i 50 Hz 525p 59 94 Hz 1080i 59 94 Hz 625i 50 Hz 1080i 60 Hz 625p 50 Hz 1080p 23 98 Hz 720p 23 98 Hz 1080p 24 Hz 720p 24 Hz 1080p 25 Hz 720p 25 Hz 1080p 2...

Страница 55: ...o L 1 or 0 707 L 0 707 or 0 5 C 0 707 or 0 5 LS 0 or 0 5 LFE R 1 or 0 707 R 0 707 or 0 5 C 0 707 or 0 5 RS 0 or 0 5 LFE C LFE LS and RS monitor outputs mute Stereo to Mono With a stereo input selected the result is C 0 707L 0 707R L R LS RS and LFE monitor outputs mute With a surround input selected the surround to stereo downmix function automatically enables resulting in C 0 707 or 0 5 L 0 707 o...

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