JPS57125542A - Multi-path distortion detector for fm radio receiver - Google Patents

Multi-path distortion detector for fm radio receiver

Info

Publication number
JPS57125542A
JPS57125542A JP1074581A JP1074581A JPS57125542A JP S57125542 A JPS57125542 A JP S57125542A JP 1074581 A JP1074581 A JP 1074581A JP 1074581 A JP1074581 A JP 1074581A JP S57125542 A JPS57125542 A JP S57125542A
Authority
JP
Japan
Prior art keywords
signal
detection
pulse component
stereo
differential
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
JP1074581A
Other languages
Japanese (ja)
Inventor
Motomiki Hirano
Hiroshige Fukuhara
Norio Fujiki
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co 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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP1074581A priority Critical patent/JPS57125542A/en
Publication of JPS57125542A publication Critical patent/JPS57125542A/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

Abstract

PURPOSE:To prevent the erroneous detection of multi-path distortion, by tanking a signal in audible frequency band for a signal in FM detection of a stereo FM signal as a reference and detecting the level difference with a signal summing each of stereo audio signals separated left and right. CONSTITUTION:When a multi-path reception takes place, a continuous pulse component is caused in an FM detection signal E0. An LPF 13 picks up a (L+R) signal in 15kHz or less from the FM detection signal E0 including this pulse component. On the other hand, a stereo demodulation circuit 7 samples an FM detection signal E0 in the timing shown in thick lines from the FM detection signal E0 including the continuous pulse component to obtain L, R signals. But, an L' signal different from the correct L signal is outputted. Thus, synthesis is made at an adder 14 and (L'+R) signal in 15kHz or less is picked up at an LPF 15. A differential amplifier 16 outputs a differential signal as (L'+L), and an AM detector 17 outputs a DC voltage according to the differential signal as a distortion detecting signal.
JP1074581A 1981-01-29 1981-01-29 Multi-path distortion detector for fm radio receiver Pending JPS57125542A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1074581A JPS57125542A (en) 1981-01-29 1981-01-29 Multi-path distortion detector for fm radio receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1074581A JPS57125542A (en) 1981-01-29 1981-01-29 Multi-path distortion detector for fm radio receiver

Publications (1)

Publication Number Publication Date
JPS57125542A true JPS57125542A (en) 1982-08-04

Family

ID=11758839

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1074581A Pending JPS57125542A (en) 1981-01-29 1981-01-29 Multi-path distortion detector for fm radio receiver

Country Status (1)

Country Link
JP (1) JPS57125542A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4590615A (en) * 1983-07-06 1986-05-20 Pioneer Electronic Corporation Multipath distortion reducing circuit
JPH0186736U (en) * 1987-11-30 1989-06-08
US8237532B2 (en) 2008-12-11 2012-08-07 Sanken Electric Co., Ltd. Electronic circuit device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4590615A (en) * 1983-07-06 1986-05-20 Pioneer Electronic Corporation Multipath distortion reducing circuit
JPH0186736U (en) * 1987-11-30 1989-06-08
US8237532B2 (en) 2008-12-11 2012-08-07 Sanken Electric Co., Ltd. Electronic circuit device

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