JPS5560356A - Stereo signal demodulation system - Google Patents

Stereo signal demodulation system

Info

Publication number
JPS5560356A
JPS5560356A JP13266778A JP13266778A JPS5560356A JP S5560356 A JPS5560356 A JP S5560356A JP 13266778 A JP13266778 A JP 13266778A JP 13266778 A JP13266778 A JP 13266778A JP S5560356 A JPS5560356 A JP S5560356A
Authority
JP
Japan
Prior art keywords
plog
switching
stereophonic
antenna input
signal
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
JP13266778A
Other languages
Japanese (ja)
Inventor
Tsutomu Noda
Kazuhiko Yamazaki
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 JP13266778A priority Critical patent/JPS5560356A/en
Publication of JPS5560356A publication Critical patent/JPS5560356A/en
Pending 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
    • H04H40/72—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 noise suppression
    • 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

Landscapes

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

Abstract

PURPOSE:To eliminate unpleasantness in switching by providing a semi-stereophonic mode which is close to stereophonic one when an antenna input signal level is high and to monophonic one when low. CONSTITUTION:In accordance with an antenna input signal level, the amplitude of a switching signal obtained by switching signal generator 8 is varied by controlling variable gain amplifier 31 by level detector 11 to drive linear stereophonic demodulator 32. Here, switching signal SWL obtaining left signal L and switching signal SWR obtaining right signal R are given by SWL=1/2+K(S)(sinomegat+sin3omegat/ 3+...).2/pi SWR=1/2-K(S)(sinomegat+sintheta3omegat/3+...).2/pi Here, K(S) varies with the antenna input signal level and when S is between constants A and B, we have Lout=L[1+plog(S/B)]R/2[1-plog(S/B)]/2 Rout=L[1- plog(S/B)]+R/2[1+plog(S/B)]/2.
JP13266778A 1978-10-30 1978-10-30 Stereo signal demodulation system Pending JPS5560356A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13266778A JPS5560356A (en) 1978-10-30 1978-10-30 Stereo signal demodulation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13266778A JPS5560356A (en) 1978-10-30 1978-10-30 Stereo signal demodulation system

Publications (1)

Publication Number Publication Date
JPS5560356A true JPS5560356A (en) 1980-05-07

Family

ID=15086671

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13266778A Pending JPS5560356A (en) 1978-10-30 1978-10-30 Stereo signal demodulation system

Country Status (1)

Country Link
JP (1) JPS5560356A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5711551A (en) * 1980-06-26 1982-01-21 Nec Corp Fm multiplex demodulator
JP2009194506A (en) * 2008-02-13 2009-08-27 Pioneer Electronic Corp Reception device, sound reproducing method, sound reproducing program, and recording medium thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5711551A (en) * 1980-06-26 1982-01-21 Nec Corp Fm multiplex demodulator
JP2009194506A (en) * 2008-02-13 2009-08-27 Pioneer Electronic Corp Reception device, sound reproducing method, sound reproducing program, and recording medium thereof

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