JPS5694881A - Automatic gain control system of tv relay broadcasting machine - Google Patents

Automatic gain control system of tv relay broadcasting machine

Info

Publication number
JPS5694881A
JPS5694881A JP17033779A JP17033779A JPS5694881A JP S5694881 A JPS5694881 A JP S5694881A JP 17033779 A JP17033779 A JP 17033779A JP 17033779 A JP17033779 A JP 17033779A JP S5694881 A JPS5694881 A JP S5694881A
Authority
JP
Japan
Prior art keywords
signal
voice
alpha
gain control
automatic gain
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
JP17033779A
Other languages
Japanese (ja)
Other versions
JPS609393B2 (en
Inventor
Kenji Koro
Yasumi Ozaki
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.)
Oki Electric Industry Co Ltd
Japan Broadcasting Corp
Original Assignee
Nippon Hoso Kyokai NHK
Oki Electric Industry Co Ltd
Japan Broadcasting 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 Nippon Hoso Kyokai NHK, Oki Electric Industry Co Ltd, Japan Broadcasting Corp filed Critical Nippon Hoso Kyokai NHK
Priority to JP54170337A priority Critical patent/JPS609393B2/en
Publication of JPS5694881A publication Critical patent/JPS5694881A/en
Publication of JPS609393B2 publication Critical patent/JPS609393B2/en
Expired 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
    • H04N5/52—Automatic gain control

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Receiver Circuits (AREA)
  • Details Of Television Systems (AREA)

Abstract

PURPOSE:To prevent a voice signal from being amplified more than the prescribed level in an automatic gain control circuit of a TV relay broadcasting machine, by controlling the gain by the arithmetic result of the modulated signal and the voice signal. CONSTITUTION:Both the video component and the voice component are detected through the video wave detecting circuit DET2 and by the signal E(t) partially connected by the output band pass filter BPF. The peak value f2(alpha) is detected by the peak detecting circuit DET1, and at the same time the voice level f3(alpha) is obtained by the voice level detecting circuit DET3. These factors are added together by the adder circuit ADD to obtain f4(alpha). This addition signal f4(alpha) receives an error amplification through the error amplifier DCAMP, and the output is kept at a constant level via the automatic gain control circuit amplifier AGCAMP. As a result, the amplification factor of the voice signal is reduced less than the prescribed level even in case the video carrier component of the input signal does not exist.
JP54170337A 1979-12-28 1979-12-28 Automatic gain control method in TV relay broadcasting equipment Expired JPS609393B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54170337A JPS609393B2 (en) 1979-12-28 1979-12-28 Automatic gain control method in TV relay broadcasting equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54170337A JPS609393B2 (en) 1979-12-28 1979-12-28 Automatic gain control method in TV relay broadcasting equipment

Publications (2)

Publication Number Publication Date
JPS5694881A true JPS5694881A (en) 1981-07-31
JPS609393B2 JPS609393B2 (en) 1985-03-09

Family

ID=15903056

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54170337A Expired JPS609393B2 (en) 1979-12-28 1979-12-28 Automatic gain control method in TV relay broadcasting equipment

Country Status (1)

Country Link
JP (1) JPS609393B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1098517A2 (en) * 1999-11-04 2001-05-09 Alps Electric Co., Ltd. AGC circuit eliminating influence of audio intermediate frequency signals

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0420098A (en) * 1990-05-14 1992-01-23 Noboru Denki Seisakusho:Kk Mounting device for speaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1098517A2 (en) * 1999-11-04 2001-05-09 Alps Electric Co., Ltd. AGC circuit eliminating influence of audio intermediate frequency signals

Also Published As

Publication number Publication date
JPS609393B2 (en) 1985-03-09

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