Method for encoding analog signals using PCM difference code word for forming a code word of specified length
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United States of America Patent
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Mar 20, 1984
Grant Date -
N/A
app pub date -
Sep 22, 1980
filing date -
Oct 12, 1979
priority date (Note) -
Expired
status (Latency Note)
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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.
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