JPS5636239A - Squelch unit of receiver - Google Patents

Squelch unit of receiver

Info

Publication number
JPS5636239A
JPS5636239A JP11270779A JP11270779A JPS5636239A JP S5636239 A JPS5636239 A JP S5636239A JP 11270779 A JP11270779 A JP 11270779A JP 11270779 A JP11270779 A JP 11270779A JP S5636239 A JPS5636239 A JP S5636239A
Authority
JP
Japan
Prior art keywords
level
voltage
squelch
light emission
input
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.)
Granted
Application number
JP11270779A
Other languages
Japanese (ja)
Other versions
JPS6214137B2 (en
Inventor
Giichi Maekawa
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP11270779A priority Critical patent/JPS5636239A/en
Publication of JPS5636239A publication Critical patent/JPS5636239A/en
Publication of JPS6214137B2 publication Critical patent/JPS6214137B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • H03G3/341—Muting when no signals or only weak signals are present

Landscapes

  • Noise Elimination (AREA)

Abstract

PURPOSE:To make it possible to set and change a squelch level simply and accurate ly, by displaying the squelch level visually. CONSTITUTION:The DC voltage (DC voltage corresponding to the receiving input level) dependent upon the automatic gain control signal of intermediate frequency amplifying circuit 5 and reference voltages which correspond to the input signal level of 0dB, 10dB, and 20dB respectively are compared by comparators 21, 27 and 23. When the DC voltage is larger than reference voltages, light emission diodes 25, 31 and 37 are driven by outputs of comparators to display the input level; and when the DC voltage is smaller than the minimum reference voltage (voltage corresponding to the input signal level of 0dB), only light emission diode 19 is driven. Consequently, since the receiving input level can be detected by states of respective light emission diodes, the squelch level corresponding to the input level can be set and changed easily by connection switches 20, 26, 32, and 38.
JP11270779A 1979-09-03 1979-09-03 Squelch unit of receiver Granted JPS5636239A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11270779A JPS5636239A (en) 1979-09-03 1979-09-03 Squelch unit of receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11270779A JPS5636239A (en) 1979-09-03 1979-09-03 Squelch unit of receiver

Publications (2)

Publication Number Publication Date
JPS5636239A true JPS5636239A (en) 1981-04-09
JPS6214137B2 JPS6214137B2 (en) 1987-03-31

Family

ID=14593476

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11270779A Granted JPS5636239A (en) 1979-09-03 1979-09-03 Squelch unit of receiver

Country Status (1)

Country Link
JP (1) JPS5636239A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58154934A (en) * 1982-03-09 1983-09-14 Matsushita Electric Ind Co Ltd Interrupting circuit of demodulation signal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58154934A (en) * 1982-03-09 1983-09-14 Matsushita Electric Ind Co Ltd Interrupting circuit of demodulation signal
JPH0418488B2 (en) * 1982-03-09 1992-03-27 Matsushita Electric Ind Co Ltd

Also Published As

Publication number Publication date
JPS6214137B2 (en) 1987-03-31

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