JPH01225229A - Pulse-like noise removing device in fm receiver - Google Patents

Pulse-like noise removing device in fm receiver

Info

Publication number
JPH01225229A
JPH01225229A JP5042188A JP5042188A JPH01225229A JP H01225229 A JPH01225229 A JP H01225229A JP 5042188 A JP5042188 A JP 5042188A JP 5042188 A JP5042188 A JP 5042188A JP H01225229 A JPH01225229 A JP H01225229A
Authority
JP
Japan
Prior art keywords
circuit
noise
output
signal
detecting
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
JP5042188A
Other languages
Japanese (ja)
Inventor
Yasuo Kawakami
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.)
Pioneer Corp
Original Assignee
Pioneer Electronic 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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP5042188A priority Critical patent/JPH01225229A/en
Publication of JPH01225229A publication Critical patent/JPH01225229A/en
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To detect a pulse noise without fail and to execute the removal of the noise securely by obtaining a direct current signal to correspond to the size of an output signal level and controlling the gain of an amplifying means with this direct current signal.
CONSTITUTION: The output of an FM detecting circuit 1 is inputted through an HPF6 and a noise amplifier 7 to a noise detecting circuit 8 and a rectifying circuit 12. The noise detecting circuit 8 detects a high level signal as a noise detecting signal and an output is waveform-shaped in waveform shaping circuits 9 and 17. Gate circuits 3 and 13 are made in an interrupting condition by the output of the waveform shaping circuit 9. A detecting signal, which is outputted from the FM detecting circuit 1 and passed through a delay circuit 2, is disconnected by the gate circuit 3. The output to be obtained from the rectifying circuit 12 through the gate circuit 13 and an LPF11 controls the gain of the noise amplifier 7. When the gate circuit 13 is disconnected, a direct current level to be held by a capacitor 15 of the LPF11 is supplied to the noise amplifier 7.
COPYRIGHT: (C)1989,JPO&Japio
JP5042188A 1988-03-03 1988-03-03 Pulse-like noise removing device in fm receiver Granted JPH01225229A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5042188A JPH01225229A (en) 1988-03-03 1988-03-03 Pulse-like noise removing device in fm receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5042188A JPH01225229A (en) 1988-03-03 1988-03-03 Pulse-like noise removing device in fm receiver

Publications (1)

Publication Number Publication Date
JPH01225229A true JPH01225229A (en) 1989-09-08

Family

ID=12858400

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5042188A Granted JPH01225229A (en) 1988-03-03 1988-03-03 Pulse-like noise removing device in fm receiver

Country Status (1)

Country Link
JP (1) JPH01225229A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04297134A (en) * 1991-02-27 1992-10-21 Fujitsu Ten Ltd Pulse noise detection circuit in am receiver
US5303415A (en) * 1991-02-27 1994-04-12 Fujitsu Ten Limited Pulse noise detecting circuit of AM receiver

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5358712A (en) * 1976-11-08 1978-05-26 Clarion Co Ltd Noise detecting circuit
JPS5735426A (en) * 1981-05-21 1982-02-26 Clarion Co Ltd Noise detecting circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5358712A (en) * 1976-11-08 1978-05-26 Clarion Co Ltd Noise detecting circuit
JPS5735426A (en) * 1981-05-21 1982-02-26 Clarion Co Ltd Noise detecting circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04297134A (en) * 1991-02-27 1992-10-21 Fujitsu Ten Ltd Pulse noise detection circuit in am receiver
US5303415A (en) * 1991-02-27 1994-04-12 Fujitsu Ten Limited Pulse noise detecting circuit of AM receiver

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