JPS6166258A - Frequency detecting circuit - Google Patents

Frequency detecting circuit

Info

Publication number
JPS6166258A
JPS6166258A JP18837084A JP18837084A JPS6166258A JP S6166258 A JPS6166258 A JP S6166258A JP 18837084 A JP18837084 A JP 18837084A JP 18837084 A JP18837084 A JP 18837084A JP S6166258 A JPS6166258 A JP S6166258A
Authority
JP
Japan
Prior art keywords
signal
frequency
revolutions
motor
time base
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
JP18837084A
Other languages
Japanese (ja)
Other versions
JPH0476190B2 (en
Inventor
Masaaki Kondo
Nobuyuki Ogawa
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP59188370A priority Critical patent/JPH0476190B2/ja
Publication of JPS6166258A publication Critical patent/JPS6166258A/en
Publication of JPH0476190B2 publication Critical patent/JPH0476190B2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE: To attain the accurate detection of frequency for a rotary recording medium reproducer by counting the frequencies of a VCO in an N-revolution period and therefore eliminating the effects of the fluctuation of a time base which is synchronous with revolutions of a motor.
CONSTITUTION: An FG signal generator 18 produces a signal having a frequency of an integer multiple as much as the rotational frequency of a motor. This signal is supplied to a gate pulse generator 16 in the form of a reference signal. Then the FG signal is divided to produce the count section pulses in an N- revolution period (N: an integer) and then produces the output section pulses for a fixed period after counting and decision. Thus the oscillation frequencies of a VCO12 are counted for the N-revolution period despite the fluctuation of a time base which is synchronous with the revolutions of the motor. Then the fluctuation component of the time base synchronizing with the revolution is equal to 0 by averaging the N revolutions. This secures an accurate frequency detecting point and also secures a desired follow-up range when an APC circuit is locked.
COPYRIGHT: (C)1986,JPO&Japio
JP59188370A 1984-09-07 1984-09-07 Expired - Lifetime JPH0476190B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59188370A JPH0476190B2 (en) 1984-09-07 1984-09-07

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59188370A JPH0476190B2 (en) 1984-09-07 1984-09-07

Publications (2)

Publication Number Publication Date
JPS6166258A true JPS6166258A (en) 1986-04-05
JPH0476190B2 JPH0476190B2 (en) 1992-12-02

Family

ID=16222424

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59188370A Expired - Lifetime JPH0476190B2 (en) 1984-09-07 1984-09-07

Country Status (1)

Country Link
JP (1) JPH0476190B2 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS535608A (en) * 1976-07-05 1978-01-19 Sony Corp Hunting characteristic measurement device
JPS5897136A (en) * 1981-12-04 1983-06-09 Matsushita Electric Ind Co Ltd Optical recorder

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS535608A (en) * 1976-07-05 1978-01-19 Sony Corp Hunting characteristic measurement device
JPS5897136A (en) * 1981-12-04 1983-06-09 Matsushita Electric Ind Co Ltd Optical recorder

Also Published As

Publication number Publication date
JPH0476190B2 (en) 1992-12-02

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