Pulse or digital communications – Pulse code modulation – Differential
Reexamination Certificate
2005-03-09
2010-10-19
Payne, David C (Department: 2611)
Pulse or digital communications
Pulse code modulation
Differential
C375S247000
Reexamination Certificate
active
07817725
ABSTRACT:
The present invention aims to provide a transmitter circuit that is capable of suppressing quantization noise and operating with a high efficiency, a data converter section13and a data conversion method for use therein, and a communications device using the same. The data converter section13of the present invention performs a predetermined data conversion operation on an input signal. The data converter section13includes: a signal processing section133for discretizing the input signal to produce a signal having a lower resolution magnitude-wise than that of the input signal; a subtractor section134for subtracting the input signal from the signal having a lower resolution to extract quantization noise; a filter135for extracting quantization noise near an intended wave frequency; and a subtractor section136for removing the quantization noise near the intended wave frequency from the signal having a lower resolution.
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Adachi Hisashi
Matsuura Toru
Panasonic Corporation
Panwalkar Vineeta S
Payne David C
Wenderoth Lind & Ponack LLP
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