JPS55136774A - Audio buzz erase unit for television receiver - Google Patents

Audio buzz erase unit for television receiver

Info

Publication number
JPS55136774A
JPS55136774A JP4414579A JP4414579A JPS55136774A JP S55136774 A JPS55136774 A JP S55136774A JP 4414579 A JP4414579 A JP 4414579A JP 4414579 A JP4414579 A JP 4414579A JP S55136774 A JPS55136774 A JP S55136774A
Authority
JP
Japan
Prior art keywords
audio
signal
output
amplitude
detection section
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
JP4414579A
Other languages
Japanese (ja)
Inventor
Masanori Ogino
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP4414579A priority Critical patent/JPS55136774A/en
Publication of JPS55136774A publication Critical patent/JPS55136774A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Receiver Circuits (AREA)
  • Noise Elimination (AREA)
  • Picture Signal Circuits (AREA)

Abstract

PURPOSE:To reduce the audio buzz interference, by interruption the output of audio demodulation circuit with the switch means separately provided and holding the audio signal instantaneous value immediately before in place of it, when the amplitude of audio intermediate frequency signal or amplitude of video signal is in failure. CONSTITUTION:The signal is processed sequentially with the tuner 1, video intermediate frequency amplifying and detection section 2, SIF amplifier 3, audio demodulator 4, and video signal processing circuit 5. At the audio buzz interference production of SIF signal A, the deficient part B is present, and this is detected by detecting the minimum part of the envelope amplitude at the detection section 6, and the output B of the envelope detection is wave-shaped at the pulse shaping circuit 7, and the output pulse C is fed to the switch 8 as the control pulse to open the transmission line of the audio input signal D fed to the input terminal 23 and the audio output signal E is obtained at the output terminal. The abnormal amplitude of the video signal is detected at the failure detection section 9 and wave shape circuit 10 and the audio buzz is erased by controlling the switch 8 similarly.
JP4414579A 1979-04-13 1979-04-13 Audio buzz erase unit for television receiver Pending JPS55136774A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4414579A JPS55136774A (en) 1979-04-13 1979-04-13 Audio buzz erase unit for television receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4414579A JPS55136774A (en) 1979-04-13 1979-04-13 Audio buzz erase unit for television receiver

Publications (1)

Publication Number Publication Date
JPS55136774A true JPS55136774A (en) 1980-10-24

Family

ID=12683461

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4414579A Pending JPS55136774A (en) 1979-04-13 1979-04-13 Audio buzz erase unit for television receiver

Country Status (1)

Country Link
JP (1) JPS55136774A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5210334A (en) * 1975-07-15 1977-01-26 Honny Chem Ind Co Ltd Electro-deposition coating composition
JPS53114309A (en) * 1977-03-16 1978-10-05 Sony Corp Receiver

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5210334A (en) * 1975-07-15 1977-01-26 Honny Chem Ind Co Ltd Electro-deposition coating composition
JPS53114309A (en) * 1977-03-16 1978-10-05 Sony Corp Receiver

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