Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1977-01-03
1978-01-31
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
325 38R, 325 38B, H03K 1322
Patent
active
040718425
ABSTRACT:
An input analog signal is converted to a digital output signal by an oversampled predictive DPCM coder which includes an n stage delay line in the feedback loop. The n delay line outputs are weighted by coefficients a.sub.i . . . a.sub.n selected according to the relationship ##EQU1## AND THEN SUMMED. Alternatively, the feedback loop may comprise a chain of n integrators arranged so that the signal fed back to the comparator is the sum of single, double, triple...n order integration. By so doing, the coder attenuates the signal power at the quantizer input while the attenuator coefficients are independent of the input signal statistics.
A similar technique may also be applied in an oversampled error feedback coder, which includes a feedback loop having an n stage delay line. Here again, the delay line outputs are weighted in accordance with the above relationship. Alternatively, a chain of n integrators may be used in the coder input, and an identical chain employed in the feedback loop. By so doing, the coder attenuates the coding noise power in the signal band while the coder design is rendered independent of the quantizing error statistics.
REFERENCES:
patent: 3502986 (1970-03-01), Lucky
patent: 3621397 (1971-11-01), Murotani
Bell Telephone Laboratories Incorporated
Freedman Barry H.
Miller Charles D.
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