Method for encoding analog signals using PCM difference code wor

Details Method for encoding analog signals using PCM difference code wor Method for encoding analog signals using PCM difference code wor

1980-09-22

1984-03-20

Sloyan, T. J.

Pulse or digital communications

Repeaters

Testing

340347AD, 340347M, H03K 1322

Patent

active

044385226

ABSTRACT:
A method for encoding analog signals for storage or transmission purposes, particularly for the digital recording of audio signals in studio devices, samples periodic values of the analog signals and converts the sampled values into pulse-code modulation code words. Successive pulse-code modulation code words are transformed by means of subtraction into pulse-code modulation difference code words and, together with additional auxiliary code elements, form a reference code word having a selected constant length. A reduction of the digital signal flow is achieved as a result of the reference code word, including the auxiliary code elements, being selected shorter than the maximum possible length of a pulse-code modulation difference code word. The generated pulse-code modulation difference code words are continuously monitored as to length, and upon the identification of a difference code word having an excess length, that is, greater than the reference code word, either the excess-length difference code word is abbreviated or is replaced by a pulse-code modulation code word of suitable length.

REFERENCES:
patent: 3403226 (1968-09-01), Wintringham
patent: 3422227 (1969-01-01), Brown
patent: 3945002 (1976-03-01), Duttweiler et al.
Blesser, Digitization of Audio: A Comprehensive Examination of Theory. . . , Journal of the Audio Engineering Society, Oct. 1978, vol. 26, No. 10, pp. 739-771.
Gilchrist, Digital Sound Signals: Tests to Compare the Performance . . . , BBC Research Department Report 1978/26, 8/78; pp. 1-7+3 sheets.

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