'ADPCM' related articles 1

  1. 2008/03/21 VS1103B - MIDI/ADPCM AUDIO CODEC
Description
VS1103b is a single-chip MIDI/ADPCM/WAV audio decoder and ADPCM encoder that can handle upto three simultaneous audio streams.
It can also act as a Midi synthesizer.
VS1103b contains a high-performance, proprietary low-power DSP processor core VS DSP4, working data memory, 5 KiB instruction RAM and 0.5 KiB data RAM for user applications, serial
control and input data interfaces, 4 general purpose I/O pins, an UART, as well as a high-quality variable-sample-rate mono ADC and stereo DAC, followed by an earphone amplifier and a common buffer.
VS1103b receives its input bitstreams through serial input buses, which it listens to as a system
slave.
The input streams are decoded and passed through digital volume controls to an 18-bit oversampling, multi-bit, sigma-delta DAC.
Decoding is controlled via a serial control bus.
In addition to basic decoding, it is possible to add application specific features, like DSP effects, to user RAM memory.

Features
• Mixes three audio sources
– General MIDI 1+ / SP-MIDI
– WAV (PCM + IMA ADPCM)
– Microphone or line input
• Encodes IMA ADPCM from microphone, line input or mixed output
• Input streams can use different sample rates
• EarSpeaker Spatial Processing
• Bass and treble controls
• Operates with a single 12. . . 13 MHz clock
• Internal PLL clock multiplier
• Low-power operation
• High-quality on-chip stereo DAC with no phase error between channels
• Stereo earphone driver capable of driving a 30­ load
• Separate operating voltages for analog, digital and I/O
• 5.5 KiB On-chip RAM for user code / data
• Serial control and data interfaces
• Can be used as a slave co-processor
• SPI flash boot for special applications
• UART for debugging purposes
• New functions may be added with software and 4 GPIO pins

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