GB1415899A - Recording level control apparatus and method - Google Patents

Recording level control apparatus and method

Info

Publication number
GB1415899A
GB1415899A GB652473A GB652473A GB1415899A GB 1415899 A GB1415899 A GB 1415899A GB 652473 A GB652473 A GB 652473A GB 652473 A GB652473 A GB 652473A GB 1415899 A GB1415899 A GB 1415899A
Authority
GB
United Kingdom
Prior art keywords
level
pilot tone
gain
accordance
control
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.)
Expired
Application number
GB652473A
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.)
International Standard Electric Corp
Original Assignee
International Standard 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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1415899A publication Critical patent/GB1415899A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor

Abstract

1415899 Automatic gain control INTERNATIONAL STANDARD ELECTRIC CORP 9 Feb 1973 [11 Feb 1972] 6524/73 Heading H4R In an automatic volume control system for a recorder the gain is controlled, at least in part, in accordance with the level of a residual subcarrier of received signals, e.g. in accordance with the level of the 19 kHz subcarrier of a stereophonic FM broadcast signal. As described the gain of the record amplifier 2 is controlled by a circuit 7 fed both with the level of the recording signal 6 and the pilot tone selected by filter 11 at the output of FM receiver 1. Switching can be provided, which can be automatic on detection of the pilot tone, to select recording gain control in accordance with the level of the pilot tone, the level of the recording signal, or a combination of both. When selecting control by pilot tone the hangover time constant of the control signal rectifier can be reduced.
GB652473A 1972-02-11 1973-02-09 Recording level control apparatus and method Expired GB1415899A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722206638 DE2206638A1 (en) 1972-02-11 1972-02-11 PROCEDURE FOR AUTOMATIC LEVELING CONTROL FOR MAGNETIC SOUND, IN PARTICULAR TAPE RECEIVERS

Publications (1)

Publication Number Publication Date
GB1415899A true GB1415899A (en) 1975-12-03

Family

ID=5835785

Family Applications (1)

Application Number Title Priority Date Filing Date
GB652473A Expired GB1415899A (en) 1972-02-11 1973-02-09 Recording level control apparatus and method

Country Status (4)

Country Link
JP (1) JPS5326804B2 (en)
DE (1) DE2206638A1 (en)
FR (1) FR2171347B1 (en)
GB (1) GB1415899A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5752741Y2 (en) * 1975-12-12 1982-11-16
DE2902616C3 (en) * 1979-01-24 1982-01-14 Blaupunkt-Werke Gmbh, 3200 Hildesheim VHF receiver, especially car receiver, with field strength-dependent volume control

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2783372A (en) * 1955-08-01 1957-02-26 Rca Corp Automatic gain control system
DE1491960A1 (en) * 1966-02-03 1969-08-07 Inst Rundfunktechnik Gmbh Process for automatic gain control (fading control) in radio receivers

Also Published As

Publication number Publication date
JPS5326804B2 (en) 1978-08-04
FR2171347B1 (en) 1976-09-10
DE2206638A1 (en) 1973-08-23
FR2171347A1 (en) 1973-09-21
JPS4890210A (en) 1973-11-24

Similar Documents

Publication Publication Date Title
DK176887A (en) RECEIVER SIDE EQUIPMENT FOR SENDERSIDE CONTROLLED OPERATION
GB1504177A (en) Dictation system
GB1415899A (en) Recording level control apparatus and method
GB2081540B (en) Automatic power supply system
DE3476148D1 (en) Signal-dropout correction circuit for correcting video signals disturbed by signal dropouts
US4455673A (en) Stereo indicating circuit
GB1346078A (en) Four channel record reproducing apparatus
GB1427896A (en) Power supply circuits for combined audio systems
JPS57141004A (en) Recording system for multichannel sound signal
KR880000460B1 (en) Apparatus for demodulating an am stereophonic signal
JPS5634155A (en) Automatic recording system
JPS5528547A (en) Magnetic recorder/reproducer
JPS5288302A (en) Recording level setting device for fm signals
JPS5566160A (en) Transmission system of time information
JPS57208608A (en) Video tape recorder
JPS5736405A (en) Sound recorder
JPS5552567A (en) Automatic music selector of tape recorder
JPS55115779A (en) Reproducing unit of video format signal
JPS568937A (en) Am stereophonic receiver
JPS57107683A (en) Dropout compensating circuit for video signal
JPS5627548A (en) Transmission-reception system for fm broadcast
JPS56106483A (en) Television receiving device
JPS56141679A (en) Error signal compensation system
JPS5694546A (en) Reproducing device for recording disc
JPS5724110A (en) Automatic sound volume adjusting system

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee