资料介绍
In the past, adding speech recording and playback
capability to a product meant using a digital signal
processor or a specialized audio chip. Now, using a
simplified Adaptive Differential Pulse Code Modulation
(ADPCM) algorithm, these audio capabilities can be
added to any PIC
Æ
microcontroller or DSC digital signal
controller. This application note will cover the ADPCM
compression and decompression algorithms, and an
application using a PIC18F67J10 microcontroller. AN643
Adaptive Differential Pulse Code Modulation
Using PIC Microcontrollers
3.00. The ITU (formerly CCITT) G.721 ADPCM algo-
Author: Rodger Richey
Microchip Technology Inc. rithm is well known and has been implemented on
many digital signal processors, such as the TMS320
DSP family of devices from Texas Instruments and
INTRODUCTION the ADSP-2100 family of devices from Analog Devices.
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