论文信息 - A single-channel PCM codec

A single-channel PCM codec

A single channel PCM codec is described which is being manufactured for use in the new British Post Office range of digital PABXs. The codec works on the principle of converting to and from PCM using an intermediate delta sigma modulation code format. This technique allows relatively simple analog circuitry to be used in conjunction with a digital LSI chip to perform the conversion between the intermediate code and PCM. The codec meets all the relevant CCITT Recommendations with significant operating margins.

J.D. Everard

[1] R. Steele,et al. Delta Modulation Systems , 1975 .

[2] James C. Candy,et al. A Use of Limit Cycle Oscillations to Obtain Robust Analog-to-Digital Converters , 1974, IEEE Trans. Commun..

[3] J. Iwersen. Calculated quantizing noise of single-integration delta-modulation coders , 1969 .

[4] James C. Candy,et al. Using Triangularly Weighted Interpolation to Get 13-Bit PCM from a Sigma-Delta Modulator , 1976, IEEE Trans. Commun..

[5] J. Craig,et al. Digital filters for sample-rate reduction , 1972 .

[6] Hiroshi Inose,et al. A unity bit coding method by negative feedback , 1963 .

[7] David J. Goodman,et al. The application of delta modulation to analog-to-PCM encoding , 1969 .

[8] James C. Candy,et al. A Per-Channel A/D Converter Having 15-Segment µ-255 Companding , 1976, IEEE Trans. Commun..