The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 28, 1994
Filed:
May. 07, 1992
Tsutomu Takamori, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
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.