Adaptive Differential Pulse Code Modulation Using PICmicro Microcontrollers

Adaptive Differential Pulse Code Modulation Using PIC Microcontrollers

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® microcontroller or DSC digital signal controller. This application note will cover the ADPCM compression and decompres...

Speech Compression using ADPCM

We propose a simple speech compression algorithm using subband division and ADPCM (Adaptive Differential Pulse Code Modulation) algorithm. Although speech data are stored in a semiconductor memory device, its capacity and the available network capacity are limited. Therefore, it is necessary to compress the data as much as possible. The first is that the reconstructed datum must be understood c...

Toll Quality Voice - 32 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM) MIME Sub-type Registration

Toll Quality Voice-32 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM) MIME Sub-type Registration Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state an...

Quantization is the process of mapping a continuous range of amplitudes of a signal into a finite set of discrete amplitudes Uniform quantization Nonuniform quantization Adaptive quantization Vector quantization Adaptive Differential Pulse Code Modulation

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centroid, 19, 25, 30 circular displacement, 102 code convolutional, 36, 58 Elias, 256 Gallager-vanVoorhis, 255 Golomb, 218, 254 Golomb–Rice, 188 Levenstein, 256 monotonic, 254 prefix-free, 239 terminated convolutional, 37 trellis, 38 unary, 254 zero-tail terminated convolutional, 37 codebook, 26, 27 adaptive, 154 adaptive gain, 155 stochastic, 156 stochastic gain, 156 codec ACELP, 158 code exci...