Coded data generation or conversion – Analog to or from digital conversion – Nonlinear
Patent
1994-12-12
1997-05-20
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Nonlinear
333 14, 370202, 341110, 341154, H03M 188, H04B 164
Patent
active
056316488
ABSTRACT:
A signal-processing circuit adapted for signal compression and expansion performed in the transmitter and receiver of mobile communication equipment. The signal-processing circuit comprises a multiplication type D/A converter to which an analog signal is applied, a level detector circuit that detects the level of the analog signal, and an A/D converter. The D/A converter converts the analog input signal into an analog output signal having an amplitude corresponding to digital control data. The A/D converter digitizes the output signal from the level detector circuit and supplies it as said digital control data to the D/A converter. These circuits can be fabricated from CMOS circuits.
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Analog Devices, Inc.; Analog-Digital Conversion Handbook; .COPYRGT.1986 Analog Devices, Inc.; pp. 117-120.
Kumano Kazuo
Takeda Kazuhiro
Yamada Takaaki
Sony Corporation
Williams Howard L.
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