System for transmitting or storing input signals

Details System for transmitting or storing input signals System for transmitting or storing input signals

1987-10-13

1989-07-18

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341200, 358 13, 375 27, H03M 304

Patent

active

048497584

ABSTRACT:
In known differential encoder and decoder systems, a number of processing steps within a scanning clock must be performed in the differential pulse code modulator at one location in a time-critical loop, namely a summation, a multiplication with addition, a subtraction and a quantization. For the case, which practically always occurs, particularly in picture processing, where a number of signals not used for the prediction sample is located between the signals used for the prediction sample, a solution is provided in which only a translation and an addition are required within the time-critical loop. Such an arrangement corresponds to a special split-up of the equation for the prediction error signal in single terms. The solution provided can be modified in different manners so as to economize on elaborate components, and can also be used for adaptive modulators. The same measures can also be used in the demodulator.

REFERENCES:
patent: 4179659 (1979-12-01), Tashiro
patent: 4542516 (1985-09-01), Weirich
patent: 4592070 (1986-05-01), Chow et al.
patent: 4743967 (1988-05-01), Takenaka et al.

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