JPS5464958A - Automatic frequency control unit - Google Patents

Automatic frequency control unit

Info

Publication number
JPS5464958A
JPS5464958A JP13171177A JP13171177A JPS5464958A JP S5464958 A JPS5464958 A JP S5464958A JP 13171177 A JP13171177 A JP 13171177A JP 13171177 A JP13171177 A JP 13171177A JP S5464958 A JPS5464958 A JP S5464958A
Authority
JP
Japan
Prior art keywords
frequency
value
circuit
difference
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP13171177A
Other languages
Japanese (ja)
Inventor
Hiroshi Kitaura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP13171177A priority Critical patent/JPS5464958A/en
Publication of JPS5464958A publication Critical patent/JPS5464958A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/02—Details
    • H03C3/09—Modifications of modulator for regulating the mean frequency

Abstract

PURPOSE:To secure the steady frequency at the FM modulator circuit of VTR to record the video signals over a wide band by decreasing the difference between the sum frequency value and the highest value of the frequency handled at the circiut of the frequency control unit and then lowering the value of these frequencies. CONSTITUTION:The video signals to be applied to input terminal 1 and 2 are clamped through clamping circuit 3 and 4 to be transmitted to variable capacity diode 5 and 6 whose chainging directions of the capacity are set opposite to each other even to the same-polarity video signals. The output is applied to FM oscillator 7 and 8, and this output is transmitted in the form of the low carrier FM signal from output terminal 11 via difference frequency draw-out circuit 101 comprising the balanced mixer and LPE. In this case, the output of oscillator 7 and 8 is applied to frequency difference circuit 102, 103 and 104 which are controlled by reference CW oscillator circuit 106 as well as frequency control circuit 12. Thus, the difference between the highset frequency value and the sum frequency value is decreased, and the value is set to 227.16MHz, 216.32MHz and others.
JP13171177A 1977-11-02 1977-11-02 Automatic frequency control unit Pending JPS5464958A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13171177A JPS5464958A (en) 1977-11-02 1977-11-02 Automatic frequency control unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13171177A JPS5464958A (en) 1977-11-02 1977-11-02 Automatic frequency control unit

Publications (1)

Publication Number Publication Date
JPS5464958A true JPS5464958A (en) 1979-05-25

Family

ID=15064402

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13171177A Pending JPS5464958A (en) 1977-11-02 1977-11-02 Automatic frequency control unit

Country Status (1)

Country Link
JP (1) JPS5464958A (en)

Similar Documents

Publication Publication Date Title
JPS5298408A (en) Mixer circuit
JPS53117363A (en) Modulator
JPS5464958A (en) Automatic frequency control unit
JPS55147060A (en) Fsk and psk modulating circuit
JPS5514782A (en) Television picture receiver
JPS56160192A (en) Processing circuit of chrominance signal
JPS57140058A (en) Demodulation system for phase displacement modulation signal
JPS56117405A (en) Fm modulation system
SU1133667A1 (en) Automatic frequency control circuit
JPS5478053A (en) Filter circuit
JPS5317252A (en) Ssb modulator and demodulator
SU465716A1 (en) Electrical signal delay device
JPS57135555A (en) Phase continuous fsk modulating circuit
JPS57190413A (en) Receiver
JPS558658A (en) Signal delay circuit
JPS5428562A (en) Reproduction circuit for reference carrier wave
JPS5613853A (en) Band variable type timing reproducing circuit
JPS5366353A (en) Carrier reproducer
JPS57188151A (en) Am stereo signal transmission system
JPS5680949A (en) Pseudo-leading-in evading circuit of reference carrier reproducing circuit
JPS55140306A (en) Fm am direct converter
JPS57136810A (en) Frequency modulating system using pll
JPS55658A (en) Amplitude modulation device
JPS5320847A (en) Automatic pulse phase shifter
JPS53131814A (en) Phase linear type emphasizer