Coded data generation or conversion – Digital code to digital code converters – To or from differential codes
Reexamination Certificate
2007-05-08
2007-05-08
Williams, Howard L. (Department: 2819)
Coded data generation or conversion
Digital code to digital code converters
To or from differential codes
C341S143000, C700S094000, C381S104000
Reexamination Certificate
active
11219757
ABSTRACT:
The present invention provides a digital signal processing apparatus which can perform batch processing of mixing and gain controlling, etc., one time while the frequency characteristics of different filters are being mixed to a plurality of input signals in case of the re-quantization only once. The present invention provides a digital signal processing apparatus for outputting a 1-bit digital signal by performing a delta sigma modulation process on a plurality of input signals, which includes a plurality of integrating unit, a plurality of feedforward arithmetic units that supply an arithmetic result calculated based on an independent feedforward coefficient to each input signal, to each of the plurality of the integrating units, a quantizing unit that quantizes the integrated output outputted from one of the plurality of the integrating unit, a plurality of feedback arithmetic units that supply an arithmetic result obtained by calculating quantized data outputted from the quantizing unit based on the independent feedback coefficient, to each of the plurality of the integrating units, and a mixing unit that mixes the output of the integrating unit of the front stage, the output of the feedforward arithmetic unit and the output of the feedback arithmetic unit and supplies the mixed result to the integrating unit of the rear stage.
REFERENCES:
patent: 6078621 (2000-06-01), Eastty et al.
patent: 6144328 (2000-11-01), Eastty et al.
Ichimura Gen
Noguchi Masayoshi
Suzuki Nobukazu
Sony Corporation
Williams Howard L.
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