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AMBE2000 Datasheet(PDF) 8 Page - List of Unclassifed Manufacturers |
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AMBE2000 Datasheet(HTML) 8 Page - List of Unclassifed Manufacturers |
8 / 47 page AMBE-2000™ Vocoder Chip User’s Manual Version 3.0 page 8 Visit us at www.dvsinc.com Confidential Proprietary, Subject to Change 2 AMBE™-2000 Application Design Overview 2.1 Basic Operation In its simplest model, the AMBE-2000™ can be viewed as two separate components, the Encoder and the Decoder. The Encoder receives an 8kHz. sampled stream of speech data (16-bit linear, 8-bit Alaw, or 8-bit ulaw) and outputs a stream of channel data at the desired rate. Conversely the Decoder receives a stream of channel data and synthesizes a stream of speech data. The timing for the interfaces for the AMBE-2000™ Encoder and Decoder are fully asynchronous. Figure 2-A Basic Operation AMBE-2000 Encoder 8kHz Speech Data Decoder 8kHz Speech Data AMBE-2000 Decoder 8kHz Speech Data Encoder 8kHz Speech Data Compressed Data @ 2400-9600bps Compressed Data @ 2400-9600bps Typically the speech interface is an external A/D-D/A chip. The format of the incoming and outgoing speech data streams are coupled, that is to say they must be the same format (16-bit linear, 8-bit Alaw, or 8-bit µlaw). The channel interface is commonly (but not limited to) an 8 or 16 bit microprocessor or other suitable ‘glue logic’ hardware capable of performing the rudimentary formatting functions between the AMBE-2000™ channel format and the format of the system channel under design. Optional functions of the chip, such as echo cancellation, voice activation/detection, power mode control, data/FEC rate selection, etc. are controlled either through hardware control pins (see Section 0) and/or through the decoder command interface (see Section 4) Data sent into the decoder for function control purposes is distinguished from the data to be decoded into speech through a channel format which is described in Section 4. 2.2 Initial Design Considerations Some of the initial design considerations the application engineer will face are the following: • Choice of A/D-D/A chip. • Choice of Channel Interface. • Speech and FEC Rates. 2.2.1 A/D – D/A Overview The choice of the A/D-D/A chip is critical to designing a system with superior voice quality. Given that Alaw and µlaw companding chips are already incorporating some compression to reduce the number of bits per sample, it is recommended that, when possible, a 16-bit linear device be used for maximum voice quality. When choosing a device, pay particular attention to Signal to Noise ratios and Frequency Responses of any filters that may be present on the analog front end of these chips. The Alaw and µlaw interfaces are also provided for the design engineer who is trying to fit to pre-existing conditions or is under other cost type restraints. |
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