SigSD8 Audio Module

SigSD4 audio module with 38-pin Mictor analog I/O and breakout ribbon cable are shown above. The SigSD8 is similar in physical size and connector style.

• Overview

• Audio I/O

• Features Summary

• Specifications and Data Sheets

• Mictor-to-DB37 Adaptor Information

• Software Support

• SigSD4 Audio Module

The SigSD8-SODIMM audio module provide a small-form factor 8-channel 16-bit sigma-delta analog I/O solution compatible with SigC54xx and SigC67xx DSP processor modules. Analog I/O data can be routed directly to multiple DSP devices via high-speed TDM serial bitstream, thus increasing system performance and efficiency. The modular approach also creates flexibility in configuring the number of analog I/O channels vs. DSP processors, and allowing product upgrades and configurations for a variable number of voice or audio channels.

Applications for the SigSD8 module include base-station processing, speech, audio, and acoustic algorithm processing, VoIP (voice-over Internet protocol) networking functions, VoDSL (voice-over DSL), Internet routing, multiple-channel speech or audio code / decode (e.g. G.711, G.723, G729A or MELP speech compression and MP3 audio compression), modem banks, and speech recognition.

Audio I/O

Combined with SigC54xx or SigC67xx processor modules, the SigSD8 audio module offers multichannel 16-bit sigma-delta analog I/O as an integrated component in the modular solution. Audio module system integration features include:

• available modules include SigSD4-SODIMM and SigSD8-SODIMM (4-channel and 8-channel, respectively).

• TDM (time division multiplex) serial output allows distribution of multichannel audio data to one or more DSP processors; audio data can be replicated among processors, or distributed uniformly, as needed

• analog input/output signals can be routed directly to the module using a small-outline Mictor 38-pin connector

• Eight (8) channel audio provided by Texas Instruments TLV320AIC23GQE devices with 16-bit sigma-delta audio I/O, sampling rate from 8 to 48 kHz per channel

• Compatible with SigC54xx and SigC67xx modules

• Sigma-delta converters provide sharp anti-alias and reconstruction filter roll-off, and nearly ideal linear phase response

• Sampling rates and filter cutoff frequencies are software programmable; all channels are sampled simultaneously

• High-speed synchronous serial TDM interface

• On-module logic multiplexes channels are allows host-programmable parameters, including sampling rate

• Modules contain small-outline Mictor 38-pin connector (plug), to allow analog I/O signals to be routed directly from module to backplate connection

• SODIMM module form-factor

• Supported by DirectDSP®, VDS™, and Hypersignal® Macro softwares

SigSD8 modules, when used with SigC54xx and SigC67xx processor modules, as well as other C54xx and C67xx platforms such as the Texas Instruments DSK C5402, DSK C6711 and DSK C6211 boards, are supported by Signalogic off-the-shelf DSP software products designed for DSP-based data acquisition and C54xx or C67xx and DSP code development.

Hypersignal®-Macro and Hypersignal-Acoustic software series, which offer a number of simulation and real-time instrument functions. Simulation functions include DSP and math functions, time domain display (including waterfall, contour, magnitude, unwrapped phase), difference equation, digital FIR and IIR filter design, sampling rate conversion, frequency zoom, wavelet transform, minimum phase calculation, and many more. Instrument functions include spectrum analyzer, digital oscilloscope, stimulus & response measurement, continuous signal generation, real-time filtering, continuous disk recode and generate, and more.

DirectDSP® is a Windows library which provides low-level and high-level calls for user-defined C/C++, Visual Basic, MATLAB®, or LabVIEW® programs. DirectDSP includes low-level board control functions such as reset/run/hold, register access, block memory transfer, DSP executable file download, etc. High-level functions include waveform file acquire/generate, continuous signal generation, and execution on afny arbitrary Hypersignal DSP or math function. DirectDSP® includes strip-chart recorder, digital oscilloscope and digital tape recorder demo program and source code examples.

The C54xx and C67xx Source Code Interface software contains numerous C54xx and C67xx algorithms and functions in source and binary form, such as optimized FFTs, filters, matrix, transcendental, trig, signal manipulation function, board initialization and analog I/O examples, etc. These functions form the basis of higher-level software functions and instruments; modification can be used to customize Hypersignal or DirectDSP operation. User-defined C routine hooks are provided for real-time algorithm development. C54xx and C67xx Source Code Interfaces can be used as a basic foundation for user-defined real-time DSP systems and products.

VDS™ (Voice-over-packet Development System) software is an integrated environment that includes numerous development, analysis, measurement, test debug, and simulation functions for developing VoIP and VoATM systems.

The VDS™ environment combines both simulation and real-time operating modes. It includes support for several types of off-the-shelf DSP hardware, including SigC54xx cards and systems, InterWorks™ multiprocessor telecom modules, and Texas Instruments® DSK boards.

VDS™ test and measurement features include both packet analysis and packet impairment. Packets may deliberately be impaired with a variety of error types in order to debug and measure performance of system components such as jitter buffer and echo canceller. The VDS environment and architecture supports operation as a fully automated test system.

Individual voice and audio processing components within VDS™ may be configured either as DSP software (DSP Mode, running on supported DSP hardware), or as host PC software components (Host Mode). Within the VDS user-interface, software components can be easily configured as DSP Mode or Host Mode in various combinations. This flexible and interactive configuration facilitates both development and analysis phases of VoIP and VoATM projects.

VDS™ includes network-side and telephony-side configuration and management. Voice software settings include CODEC type, echo canceller, jitter buffer, silence suppression, real-time parameters, and packet impairment test and measurement options. Voice software selections made from the GUI directly set properties in the Telogy voice software running in real-time on the C54xx DSP devices.