JPS56157148A - Stereo and monaural change-over device - Google Patents

Stereo and monaural change-over device

Info

Publication number
JPS56157148A
JPS56157148A JP6097680A JP6097680A JPS56157148A JP S56157148 A JPS56157148 A JP S56157148A JP 6097680 A JP6097680 A JP 6097680A JP 6097680 A JP6097680 A JP 6097680A JP S56157148 A JPS56157148 A JP S56157148A
Authority
JP
Japan
Prior art keywords
stereo
monaural
change
mode
over
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
JP6097680A
Other languages
Japanese (ja)
Other versions
JPS5920213B2 (en
Inventor
Giichi Shimada
Junichi Hikita
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.)
Rohm Co Ltd
Original Assignee
Rohm Co Ltd
Toyo Electronics Industry 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 Rohm Co Ltd, Toyo Electronics Industry Corp filed Critical Rohm Co Ltd
Priority to JP55060976A priority Critical patent/JPS5920213B2/en
Publication of JPS56157148A publication Critical patent/JPS56157148A/en
Publication of JPS5920213B2 publication Critical patent/JPS5920213B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
    • H04H40/36—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving
    • H04H40/45—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving for FM stereophonic broadcast systems receiving
    • H04H40/81—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving for FM stereophonic broadcast systems receiving for stereo-monaural switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1646—Circuits adapted for the reception of stereophonic signals
    • H04B1/1653—Detection of the presence of stereo signals and pilot signal regeneration

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Stereo-Broadcasting Methods (AREA)
  • Stereophonic System (AREA)

Abstract

PURPOSE:To improve the rise during a change-over between the stereo and monaural modes, by using a means having a prescribed time constant when a change- over is carried out from the stereo mode to the monaural mode and vice versa. CONSTITUTION:For a stereo demodulator of PLL system, the output of a phase comparator 68 is supplied to a differential amplifier 118 via a low pass filter 70. When a forcible change-over signal from stereo to monaural mode is supplied to a stereo-monaural change-over circuit 86, a bias is applied to a terminal 146. Thus a switch 100 is turned on to instantaneously turn a voltage control oscillator 60 into an inactive state. At the same time, the stereo switch circuit is also turned off to prevent the occurrence of a pop noise. The bias is released when the monaural mode is changed to the stereo mode, and accordingly, the oscillator works instantaneously. However, the amplifier 118 is turned on after a lapse of the delay time of the filter 70.
JP55060976A 1980-05-08 1980-05-08 stereo demodulation circuit Expired JPS5920213B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55060976A JPS5920213B2 (en) 1980-05-08 1980-05-08 stereo demodulation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55060976A JPS5920213B2 (en) 1980-05-08 1980-05-08 stereo demodulation circuit

Publications (2)

Publication Number Publication Date
JPS56157148A true JPS56157148A (en) 1981-12-04
JPS5920213B2 JPS5920213B2 (en) 1984-05-11

Family

ID=13157956

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55060976A Expired JPS5920213B2 (en) 1980-05-08 1980-05-08 stereo demodulation circuit

Country Status (1)

Country Link
JP (1) JPS5920213B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03127600A (en) * 1989-10-05 1991-05-30 Samsung Electron Co Ltd Method of preventing malfunction in changeover of audio mode

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03127600A (en) * 1989-10-05 1991-05-30 Samsung Electron Co Ltd Method of preventing malfunction in changeover of audio mode

Also Published As

Publication number Publication date
JPS5920213B2 (en) 1984-05-11

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