GB1446088A - Circuit arrangement for sound-reproducing apparatus - Google Patents

Circuit arrangement for sound-reproducing apparatus

Info

Publication number
GB1446088A
GB1446088A GB5531173A GB5531173A GB1446088A GB 1446088 A GB1446088 A GB 1446088A GB 5531173 A GB5531173 A GB 5531173A GB 5531173 A GB5531173 A GB 5531173A GB 1446088 A GB1446088 A GB 1446088A
Authority
GB
United Kingdom
Prior art keywords
signal
generator
noise
filter
audio
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
GB5531173A
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Publication of GB1446088A publication Critical patent/GB1446088A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/802—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving processing of the sound signal
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/02—Analogue recording or reproducing
    • G11B20/025—Error detection or correction
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/02—Driving or moving of heads
    • G11B21/022—Programmed access in sequence to indexed parts of operating record carriers
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B29/00—Generation of noise currents and voltages
    • 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
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • H03G3/345—Muting during a short period of time when noise pulses are detected, i.e. blanking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/93—Regeneration of the television signal or of selected parts thereof
    • H04N5/94—Signal drop-out compensation

Abstract

1446088 Sound playback apparatus BASF AG 29 Nov 1973 [30 Nov 1972] 55311/73 Heading G5R [Also in Division H4] In a sound playback apparatus a detector 7 is responsive to a characteristic signal indicative of an interruption in the playback signal to operate a switch 6 whereby an audio and/or noise generator 8, 9 inserts a bridging signal in the gap caused by the interruption. Detector 7 may operate switch 6 in response to the recorded signal envelope level, e.g. of an angle-modulated signal, dropping below a predetermined level, or to a control signal in the recording, or in response to a torque reduction, track changing or tape drive reversal in a tape recorder or to a predetermined angular position of a pick-up arm in a disc record player. The generator 8, 9 may be a delay circuit receiving an input 5a from transducer 4, or may be a generator in which the noise spectrum of a Zener diode (10), Fig. 2 (not shown), passes through a lowpass or bandpass filter with an upper cutoff at about 1 kHz. Alternatively, the generator may be an oscillator (14), Fig. 3 (not shown), set to a state of unstable equilibrium just prior to oscillation and giving a damped oscillation when triggered, or may comprise an AM demodulator (25), Fig. 4 (not shown), a lowpass filter (26), an AM modulator (27) and a noise and/or audio generator (28), the circuit giving an output signal which is amplitude-modulated with the low-frequency signal components of the envelope of the audio signal reproduced from the record medium 3, the time constant of filter (26) being greater than or equal to the duration of the gap caused by a drop-out or by track-changing of transducer 4. In a further form of generator 8, Fig. 5 (not shown), a potential divider (29) and a filter (30) act on the noise generated in playback of an F.M. recording when the carrier signal disappears during a drop out, to produce a gap-filling noise signal.
GB5531173A 1972-11-30 1973-11-29 Circuit arrangement for sound-reproducing apparatus Expired GB1446088A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722258608 DE2258608C2 (en) 1972-11-30 1972-11-30 Circuit arrangement for switching on a fill signal in a sound gap during sound reproduction

Publications (1)

Publication Number Publication Date
GB1446088A true GB1446088A (en) 1976-08-11

Family

ID=5863110

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5531173A Expired GB1446088A (en) 1972-11-30 1973-11-29 Circuit arrangement for sound-reproducing apparatus

Country Status (7)

Country Link
JP (1) JPS5747483B2 (en)
CA (1) CA989316A (en)
DE (1) DE2258608C2 (en)
FR (1) FR2209166B1 (en)
GB (1) GB1446088A (en)
IT (1) IT996380B (en)
NL (1) NL7316286A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59119511A (en) * 1982-12-27 1984-07-10 Pioneer Electronic Corp Information reproducer
DE3415956A1 (en) * 1984-04-28 1985-10-31 Robert Bosch Gmbh, 7000 Stuttgart METHOD FOR STORING FREQUENCY-MODULATED SIGNALS, AND CIRCUIT ARRANGEMENT THEREFOR
JPS61125854U (en) * 1984-12-05 1986-08-07
JPS62289446A (en) * 1986-06-10 1987-12-16 Honda Motor Co Ltd Material for laminated anti-vibration sound insulator and manufacture therof

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6803340A (en) * 1967-03-09 1968-09-10
US3629494A (en) * 1969-08-18 1971-12-21 Rca Corp Signal processor for dropout correction before demodulation

Also Published As

Publication number Publication date
DE2258608C2 (en) 1983-08-25
DE2258608A1 (en) 1974-06-06
FR2209166A1 (en) 1974-06-28
CA989316A (en) 1976-05-18
JPS4984625A (en) 1974-08-14
FR2209166B1 (en) 1978-03-10
NL7316286A (en) 1974-06-04
IT996380B (en) 1975-12-10
JPS5747483B2 (en) 1982-10-09

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19931128