Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1992-05-07
1994-06-28
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
348505, H03M 112
Patent
active
053250931
ABSTRACT:
An analog-to-digital converter. The VCO 111 generates a sampling clock with a frequency four times that of a subcarrier. The A/D conversion circuit 103 converts an analog composite signal on the basis of the sampling clock thus generated. The BPF 113 extracts an input subcarrier from the digital composite signal. The local subcarrier reference generator 112 generates a local subcarrier. The multiplier 114 detects the phase differences between the input subcarrier and the local subcarrier. The averaging (I) circuit 115 averages consecutive 4 n phase differences. The averaging (II) circuit 116 further averages the averages thus obtained over a plurality of lines. The pulse generator 117 generates a pulse signal with a width corresponding to the averages thus obtained. The integrator 118 integrates the pulse signal thus generated thereby to control the oscillating frequency and phase of the VCO 111.
REFERENCES:
patent: 4075577 (1978-02-01), Walker
patent: 4636836 (1987-01-01), Steckler et al.
patent: 4694327 (1987-09-01), Demmer et al.
patent: 4847678 (1989-07-01), McCauley
patent: 4989073 (1991-01-01), Wagner
Hoff Marc S.
Miller Jerry A.
Sony Corporation
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