Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1987-07-08
1989-02-21
Hix, L. T.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358320, 358324, 358326, H04N 979, H04N 989
Patent
active
048070483
ABSTRACT:
A frequency converter for a VTR extracts a carrier chrominance signal f.sub.S of 3.58 MHz in a video signal by an BPF 102 and applies the same to a first frequency converter 103. On the other hand, a signal having a frequency of 4.21 MHz which is the sum of a frequency 3.58 MHz of the carrier chrominance signal f.sub.S and the frequency 629 KHz of a low-frequency converted chrominance signal f.sub.SL is applied from a VCO 117. The first frequency converter 103 outputs signals (f.sub.S +f.sub.SL).+-.f.sub.S responsive to the signal of 4.21 MHz and an LPF 112 passes signal f.sub.SL of 629 KHz. On the other hand, an output of the VCO 117, together with an output of an VXO 114 which is in synchronization with a burst signal in the signal f.sub.S, is applied to a second frequency converter 118. The circuit 118 outputs signals f.sub.S .+-.(f.sub.S +f.sub.SL). An LPF 120 passes the signal f.sub.SL of 629 KHz. A phase comparator circuit 121 compares phases of the signal f.sub.SL and a horizontal synchronizing signal f.sub.H and controls an oscillating output signal of the VCO 117 in accordance with the phase difference.
REFERENCES:
patent: 4490749 (1984-12-01), Hirota
patent: 4524380 (1985-06-01), Shibata et al.
Semiconductor Handbook, "Monolithic Bipolar Integrated Circuit", Edited by Sanyo Electric O., Ltd., 1985, pp. 909 and 910.
Gray David M.
Hix L. T,.
Sanyo Electric Co,. Ltd.
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