JPS5578648A - Fm demodulator - Google Patents

Fm demodulator

Info

Publication number
JPS5578648A
JPS5578648A JP15227378A JP15227378A JPS5578648A JP S5578648 A JPS5578648 A JP S5578648A JP 15227378 A JP15227378 A JP 15227378A JP 15227378 A JP15227378 A JP 15227378A JP S5578648 A JPS5578648 A JP S5578648A
Authority
JP
Japan
Prior art keywords
signal
stereo
waveform
demodulation
subcarrier
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
JP15227378A
Other languages
Japanese (ja)
Inventor
Junichi Hikita
Masaki Nakagawa
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 JP15227378A priority Critical patent/JPS5578648A/en
Publication of JPS5578648A publication Critical patent/JPS5578648A/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 secure demodulation for the stereo wave in the monophonic from through the same operation as the synchronous AM detection of the stereo composite signal by providing the low pass filter in front of the synchronous AM detection part for the stereo demodulation. CONSTITUTION:In the case of the stereo demodulation, the sample holding is given to either peak value of the stereo composite signal via the sampling signal synchronizing with the pilot signal to obtain the waveform B of Fig.(a). Waveform B is then averaged. In case the composite signal is demodulated into the monophonic form, the composite signal is made to pass through the low pass filter to obtain the signal in which the subcarrier component of 38kHz is attenuated. At the same time, the delayed phase is secured up to about 90 deg. for the subcarrier signal, and the sample holding is given to the point corresponding to nearly the middle between both peak value of the subcarrier signal via the sampling signal to obtain waveform B shown in Fig.(b). This waveform is then averaged to obtain the signal in which signals L and R are added together.
JP15227378A 1978-12-07 1978-12-07 Fm demodulator Pending JPS5578648A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15227378A JPS5578648A (en) 1978-12-07 1978-12-07 Fm demodulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15227378A JPS5578648A (en) 1978-12-07 1978-12-07 Fm demodulator

Publications (1)

Publication Number Publication Date
JPS5578648A true JPS5578648A (en) 1980-06-13

Family

ID=15536891

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15227378A Pending JPS5578648A (en) 1978-12-07 1978-12-07 Fm demodulator

Country Status (1)

Country Link
JP (1) JPS5578648A (en)

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