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Lectrosonics DMTH4, Справочное руководство

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Digital Telephone Hybrid

Rio Rancho, NM

29

Filter Set Notebook 

(cont) 

Input Select 

Frequency Response 

Graph

 

 

Graph Scale

Filter Number - One of six tabs used to select the filter number.  One of six different filter 

types can be applied to each output filter. 

Set of three tabs to select output to which filters will be applied: TEL, CODEC and AUX. 

Each output channel page contains a graph which displays two plots: 

The frequency response of the currently selected output filter (red line) 
The total frequency response for the output channel (blue line)
The plot for the currently selected filter contains 

handles which can be used to change 

the center frequency, boost/cut, or bandwidth of the filters with the mouse.  The related 

numerical control will be updated with the exact value corresponding to the position of 

the handle. At all times the impact of changes to the currently selected filter on the over-

all response of the channel are visible in the blue plot. Frequency and gain are set by 

a single handle - movement in the horizontal axis controls frequency, movement in the 

vertical axis controls gain. Bandwidth handles move only in the horizontal axis. 

Used to select the amplitude scale of the Frequency Response Graph.  Two ranges are 

available: -15 to +15 or -30 to +30 (dB gain).

Name

Description

Содержание DMTH4

Страница 1: ...DMTH4 Digital Telephone Hybrid REFERENCE MANUAL Rio Rancho NM USA www lectrosonics com Fill in for your records Serial Number Purchase Date...

Страница 2: ...DMTH4 LECTROSONICS INC 2...

Страница 3: ...chments accessories specified by the manufacturer 12 Use only with the cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus When a cart is used use caution when...

Страница 4: ...tup easy operation and high sound quality make the DMTH4 an ideal choice for board rooms conference rooms talk radio and countless other applications Product Highlights Built in DSP based acoustic ech...

Страница 5: ...up Tabs 16 Activity Tab 16 Inputs Tab 18 In Filters Tab Input Filters 20 In Comp Tab Input Compressor 22 Matrix Tab 24 Out Source Tab Output Source 26 Out Filters Tab Output Filters 28 Out Comp Lim Ta...

Страница 6: ...he DSP at the crosspoints in the matrix which essentially provides 24 separate automatic mixers each with its own NOM mixing bus Four different mixing modes can be selected at the crosspoint for each...

Страница 7: ...a variety of issues The automatic mixer pro vides seamless allocation of gain to local microphones through a mix minus matrix to reduce background noise and decouple loudspeaker and microphones while...

Страница 8: ...or the tone generator as needed for setup diagnostics or operation Each of the 3 outputs includes extensive signal processing to optimize the mixed signal for the intended purpose such as sound reinfo...

Страница 9: ...utomatic mixing algorithm applies a patented gain proportional algorithm US Patents 5 414 776 and 5 402 500 al lowing each input assigned to a particular output to behave differently relative to the o...

Страница 10: ...he attack time is signal con trolled and varies from about 2 ms to about 100 ms as is needed to handle the signal dynamics See page 14 for a closer look at this unique and effective compressor Compres...

Страница 11: ...zation The filter types include Low pass High pass Band pass Parametric EQ Low shelving High shelving Filter slopes can be selected with 6 or 12 dB per octave Butterworth or Bessel parameters Multiple...

Страница 12: ...h attack and release times are dynamically controlled to track the RMS value of the signal level as it passes To simplify setup a single time constant value is entered to set the desired release time...

Страница 13: ...atus LED will blink rapidly In this case pressing the Mode switch will force the unit to boot up temporar ily in Master mode to allow settings to be examined or changed Cycling the power returns the D...

Страница 14: ...trol panel also acts as a controller for the DMTH4 for simple operational scenarios or trouble shooting purposes Every function of the device can be monitored and adjusted in real time The control pan...

Страница 15: ...al flow used for setting up the DMTH4 Status Bar Connection status Offline Displayed when the control panel is opened but the computer is not connected to a DMTH4 Menu options for features that requir...

Страница 16: ...hannels C C LED Glows yellow if the input channel compressor has become active or red if the input channel audio is clipping Level Meter True RMS level meter displaying the input audio level in dBu as...

Страница 17: ...enabled only when the control panel is connected to a DMTH4 If the telephone interface is not connected to the line it will be automatically connected before the number is dialed Tone pad complete DTM...

Страница 18: ...er True RMS level meter displaying the input audio level in dBu as measured after application of the main and rear panel input channel gains but before the signal is processed by the input filters and...

Страница 19: ...Digital Telephone Hybrid Rio Rancho NM 19...

Страница 20: ...adjustable center frequency and boost cut param eters Rolloff rate is selectable as 6dB or 12dB per octave High Shelving HS filter with adjustable center frequency and boost cut param eters Rolloff r...

Страница 21: ...ne The plot for the currently selected filter contains handles which can be used to change the center frequency boost cut or bandwidth of the filters with the mouse The related numerical control will...

Страница 22: ...Gain Makeup gain value Adjustable from 0dB to a limit which is a function of the threshold and compression ratio The makeup gain value automatically responds to changes to the compression ratio so tha...

Страница 23: ...response of the compressor orange line Total response the amplitude response of the compressor plus makeup gain blue line These plots contain handles which can be used to change the threshold level o...

Страница 24: ...4 crosspoints one for each main mix bus form ing a 3 row by 24 column matrix Each row in the expansion matrix contains 2 crosspoints one for each expansion mix bus forming a 3 row by 2 column matrix B...

Страница 25: ...Adaptive Proportional Gain automixing algorithm in the normal manner This is the most common setting Direct Bypasses the automixing algorithm Override Selected when the input applied to the crosspoint...

Страница 26: ...xes are available as selections for the signal source Normally the expansion matrix final mixes are used to supply audio to the TEL and CODEC outputs so they are the default selections Pink Noise A 0d...

Страница 27: ...Digital Telephone Hybrid Rio Rancho NM 27...

Страница 28: ...elving LS filter with adjustable center frequency and boost cut param eters Rolloff rate is selectable as 6dB or 12dB per octave High Shelving HS filter with adjustable center frequency and boost cut...

Страница 29: ...he plot for the currently selected filter contains handles which can be used to change the center frequency boost cut or bandwidth of the filters with the mouse The related numerical control will be u...

Страница 30: ...imiter Active glows red when the limiter for a particular output channel becomes ac tive Compressor Parameters The Compressor parameters are set by the following numeri cal controls For any of these c...

Страница 31: ...om 0 1 to 500 0 ms Gain reduction meter This meter displays the combined reduction in gain in dB that results from compressor and limiter activity Amplitude response graph Each output channel page con...

Страница 32: ...hat the compressor for the corresponding output channel is active or red to indicate that the channel is in limiting Gain control Displays the selected output channel s gain in dB Gain can be adjusted...

Страница 33: ...C and AUX outputs only Allows attenuation of the output signal For normal operation 0 dB no attenuation should be selected If attenuation by 20 or 40 dB is selected the output audio is attenuated by t...

Страница 34: ...ar panel gain for Programmable Inputs Programmable Outputs Select Programmable Input Output Notebooks Programmable Input Output Status Indicators Programmable Input Output Function Select Rear Panel I...

Страница 35: ...e Rear panel input gain controls Analog Output RP Gain Control AO Controls the rear panel gain of one or more audio outputs in response to changes in voltage applied to the programmable input Normally...

Страница 36: ...tiates the running of a macro in response to a contact closure and another macro in response to the subsequent contact opening Normally used with a momentary contact switch and can be applied to any t...

Страница 37: ...he audio inputs controlled by the programmable input are unmuted Momentary Mute Outputs Active when the audio outputs controlled by the program mable input are unmuted Momentary Mute Crosspoints Activ...

Страница 38: ...changes made in this tab take effect immediately As always the changes are not permanent unless the DMTH4 settings are stored to a preset in nonvolatile memory Note There is an exception to the above...

Страница 39: ...hough there is a tradeoff here this setting is not critical The AEC is guar anteed to function effectively at any convergence rate Individual preference or special requirements may dictate a convergen...

Страница 40: ...nswer Check to enable auto answer of incoming calls based on the number of rings identified in Nbr of rings Nbr of rings Sets the number of rings required before DMTH4 automatically answers incoming t...

Страница 41: ...e local room acoustics to provide maximum echo cancellation It must be remembered that the depth of echo cancellation under steady state conditions is limited by the level of noise in the local room A...

Страница 42: ...s connected to a DMTH4 Connect Disconnect Toggles the connection state of the interface Connection LED Glows red when Codec Interface is connected Privacy button Toggles the privacy state of the inter...

Страница 43: ...General Commands actpre active preset This command is used as a query to determine which memory preset is active The active preset is the last preset called from memory The data is an integer type in...

Страница 44: ...ate to set the mode Up dates do not take effect unitl power is cycled on the device A DMTH4 will normally be configured to oper ate in Slave mode when integrated into a system of DM series automixers...

Страница 45: ...contained in the array specify which macros to be run No data is transferred Example Request Response Command run 3 CR OK CRLF Update run 1 3 5 CR OK CR store store settings to preset This command is...

Страница 46: ...K 2 CRLF Query ingn CR OK 10 3 0 CRLF Update ingn 2 6 CR OK CRLF Update ingn 0 0 99 CR OK CRLF iniv input phase invert This command is used as a query to read the input channel phase invert status or...

Страница 47: ...input mute toggle This command is used as a simple command to toggle the input channel mute status The input channel is specified by using the address syntax Addresses must be in the range 1 to 3 Exam...

Страница 48: ...n the command applies to the entire row of the matrix associ ated with the specified input channel The data type is integer with the following values allowed 0 means that the crosspoint is in DIRECT m...

Страница 49: ...in dBu If the channel address is a wildcard then the data type is an array of integer of size 3 Examples Request Response Query outlv 1 CR OK 23 CRLF Query outlv CR OK 3 4 66 CRLF outattn output atten...

Страница 50: ...index is used to specify the mix 12 means that the output channel is fed by Expansion Bus 1 default for the telephone output 13 means the the output channel is fed by Expansion Bus 2 default for code...

Страница 51: ...y determined by the threshold and ratio set tings of the compressor and may be less than the ab solute maximum of 30 dB If the value sent in an update request exceeds this upper limit it will be force...

Страница 52: ...rmined by the threshold and ratio settings of the compressor and may be less than the absolute maximum of 30 dB If the value sent in an update request exceeds this upper limit it will be forced to the...

Страница 53: ...is used as a query to read the attack time or as an update to set the attack time The output channel is specified by using the address syntax Ad dresses must be in the range 1 to 3 The data type is in...

Страница 54: ...prgin CR OK 0 0 1 0 0 0 CRLF prgindef programmable input definition This command may be used as a query to read a pro grammable input definition or as an update to modify the definition The programma...

Страница 55: ...in the range 1 to 12 Together these values specify a group of crosspoints by identifying a single input channel and zero or more output channels Run macro on close A single integer value in the range...

Страница 56: ...a sequence of zero or more integers in the range 1 to 16 The first identifies which NOM bus audio output channel is to be referenced by the function The special value 25 has the meaning ANY Output Ch...

Страница 57: ...alue 99 may be used in an update to indicate that a particular rear panel input gain is to remain unchanged by the command Examples Request Response Query rpingn 1 CR OK 3 CRLF Query rpingn CR OK 13 4...

Страница 58: ...d the rear panel output gain preset or as an update to set the gain preset All rear panel audio output gains are controlled by this preset value which is the value loaded when the device is powered up...

Страница 59: ...CRLF Update telaec 1 CR OK CRLF telaeccr telephone acoustic echo canceller convergence rate This command may be used as a query to read the echo canceller convergence rate The data type is integer in...

Страница 60: ...er the telephone line interface The data type is string with a limit of 1 character The following characters are permitted Characters Description 0 1 2 3 4 5 6 7 8 9 DTMF digits DTMF alphabetic charac...

Страница 61: ...ble the privacy feature on the telephone line interface The data type is integer either 1 meaning enabled or 0 meaning disabled Examples Request Response Query telpriv CR OK 0 CRLF Update telpriv 1 CR...

Страница 62: ...his command may be used as a query to determine if an incoming telephone call is detected by the telephone line interface The data type is integer either 1 meaning true ring pulses detected or 0 meani...

Страница 63: ...the normal audio level Examples Request Response Query codcchmlv CR OK 3 CRLF Update codcchmlv 0 CR OK CRLF codconn codec connection status This command may be used as a query to determine the connect...

Страница 64: ...iv 1 CR OK CRLF codprivmod codec privacy mode This command may be used as a query to read the pri vacy mode setting for the codec interface It may also be used as an update to set the privacy mode The...

Страница 65: ...C D E F a b c d e f DIGIT STR_TOK ALPHA ALPHANUM INT_TOK 1SIGN 1 DIGIT FLT_TOK 1SIGN DIGIT DIGIT note that bare is valid QSTR_TOK DQUOTE QCHAR DQUOTE CRLF CR LF OK_TOK x4F x4B uppercase string OK ERRO...

Страница 66: ...pment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications If this equipment d...

Страница 67: ...Output Dynamic Range Codec AUX 105 dB unweighted 20 20 kHz Audio Performance Codec AUX IMD noise 0 1 max 0 02 nominal input level THD noise 0 1 worst case 0 02 nominal input level EIN 126 dBu Connecto...

Страница 68: ...e approximate charges by phone for out of warranty repairs Returning Units for Repair For timely service please follow the steps below A DO NOT return equipment to the factory for repair without first...

Страница 69: ...Digital Telephone Hybrid Rio Rancho NM 69...

Страница 70: ...horized dealer shipping costs prepaid within one year from the date of purchase This Limited Warranty is governed by the laws of the State of New Mexico It states the entire liablility of Lectrosonics...

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