JPS5613853A - Band variable type timing reproducing circuit - Google Patents

Band variable type timing reproducing circuit

Info

Publication number
JPS5613853A
JPS5613853A JP8960279A JP8960279A JPS5613853A JP S5613853 A JPS5613853 A JP S5613853A JP 8960279 A JP8960279 A JP 8960279A JP 8960279 A JP8960279 A JP 8960279A JP S5613853 A JPS5613853 A JP S5613853A
Authority
JP
Japan
Prior art keywords
pll
output
lead
agc
mixer
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
JP8960279A
Other languages
Japanese (ja)
Inventor
Yoshinori Uchida
Makoto Miyake
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8960279A priority Critical patent/JPS5613853A/en
Publication of JPS5613853A publication Critical patent/JPS5613853A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop

Landscapes

  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

PURPOSE:To secure a continuous change for the equivalent noise band width of the PLL, by adding the AGC in front of the PLL circuit and then setting the band of the AGC substantially equal to the lead-in frequency range of the PLL. CONSTITUTION:AGC12 is added in front of PLL circuit 11. And now if no synchronism is secured for the PLL loop, the output of mixer 7 for synchronous component becomes 0. At the same time, the output of adder 9 turns to output voltage -Vref of reference voltage generator 10, and amplifier 2 has the gain close to the maximum gain. If the synchronism of PLL11 is secured under these conditions, mixer 7 produces the output equal to the amplitude of the arrival signal. And the output of mixer 7 becomes equal to voltage Vref, and the gain of amplifier 2 is set so that the AGC control voltage may be 0. Then the band of AGC12 is set equal substantially to the lead-in frequency range of PLL11, and the AGC is actuated after lead-in of the PLL. Then the input signal to the PLL is reduced to secure the synchronous lead-in in a high speed and in a wide frequency range. Thus the equivalent noise band width can be changed continuously.
JP8960279A 1979-07-13 1979-07-13 Band variable type timing reproducing circuit Pending JPS5613853A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8960279A JPS5613853A (en) 1979-07-13 1979-07-13 Band variable type timing reproducing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8960279A JPS5613853A (en) 1979-07-13 1979-07-13 Band variable type timing reproducing circuit

Publications (1)

Publication Number Publication Date
JPS5613853A true JPS5613853A (en) 1981-02-10

Family

ID=13975303

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8960279A Pending JPS5613853A (en) 1979-07-13 1979-07-13 Band variable type timing reproducing circuit

Country Status (1)

Country Link
JP (1) JPS5613853A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0221738A (en) * 1988-05-12 1990-01-24 Digital Equip Corp <Dec> Phase locking loop with graded band width
WO2003056558A1 (en) * 2001-12-26 2003-07-10 Matsushita Electric Industrial Co., Ltd. Optical disc apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0221738A (en) * 1988-05-12 1990-01-24 Digital Equip Corp <Dec> Phase locking loop with graded band width
WO2003056558A1 (en) * 2001-12-26 2003-07-10 Matsushita Electric Industrial Co., Ltd. Optical disc apparatus

Similar Documents

Publication Publication Date Title
JPS5479384A (en) System of synchronously leading in phase locked loop
JPS54160150A (en) Frequency selecting circuit
JPS5514734A (en) Pulse noise elimination circuit
JPS5575316A (en) Control circuit for frequency characteristic
GB1506687A (en) Undesired signal canceller
JPS5613853A (en) Band variable type timing reproducing circuit
JPS5586212A (en) Frequency tracking circuit
JPS5658335A (en) Pll
JPS56117405A (en) Fm modulation system
JPS5275917A (en) Phase control circuit
JPS55149539A (en) Pll circuit
JPS54141507A (en) Phase synchronism circuit
JPS5539446A (en) Phase deviation circuit
JPS5361A (en) Fm modulation circuit
JPS5547740A (en) Fm receiver
JPS55125780A (en) Time axis correction unit
JPS5585146A (en) Frequency tracking circuit
JPS5265649A (en) Demodulating system of angle modulation wave signal
JPS55140306A (en) Fm am direct converter
JPS55151817A (en) Clock reproducing circuit
JPS5741018A (en) Dynamic tracking filter of injection synchronizing oscillator type
JPS5366353A (en) Carrier reproducer
JPS55105846A (en) Tracking circuit of vtr
JPS5679503A (en) Fluctuation noize generator
JPS53131814A (en) Phase linear type emphasizer