GB2007945A - Record noise suppression system - Google Patents

Record noise suppression system

Info

Publication number
GB2007945A
GB2007945A GB7844030A GB7844030A GB2007945A GB 2007945 A GB2007945 A GB 2007945A GB 7844030 A GB7844030 A GB 7844030A GB 7844030 A GB7844030 A GB 7844030A GB 2007945 A GB2007945 A GB 2007945A
Authority
GB
United Kingdom
Prior art keywords
noise
input
circuit
suppressed
coupled
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
GB7844030A
Other versions
GB2007945B (en
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB2007945A publication Critical patent/GB2007945A/en
Application granted granted Critical
Publication of GB2007945B publication Critical patent/GB2007945B/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
    • 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

Abstract

A circuit for suppressing audio frequency noise in a signal originating from a gramophone record. A known noise suppressing circuit comprises a signal processing section including a delay circuit coupled between an input and a noise suppressor. Where noise is being suppressed, the noise suppressor by-passes the delay circuit for a fixed period of time. During this time, if noise does occur on the input, it cannot be suppressed. This problem can be overcome by providing a circuit including a signal processing section (9) arranged between an input (1, 2) and an output (3, 4). The signal processing section (9) is provided with a delay unit (7) and a noise suppressor (8) coupled to the delay unit (7). The circuit also comprises a control signal section (10) connected to the input (1, 2) which section is provided with a noise detector (32) which is coupled by a function generator (34) to a control input (49) of the noise suppressor. At the occurrence of noise the audio signal derived from the record is suppressed inaudibly during a short constant period of time. (Figure 1). <IMAGE>
GB7844030A 1977-11-15 1978-11-10 Circuit for suppressing noise caused by scratches on a gramophone record Expired GB2007945B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7712534A NL7712534A (en) 1977-11-15 1977-11-15 CIRCUIT FOR SUPPRESSING FAULTS DUE TO SCRATCHES IN A GRAMOPHONE DISC.

Publications (2)

Publication Number Publication Date
GB2007945A true GB2007945A (en) 1979-05-23
GB2007945B GB2007945B (en) 1982-05-06

Family

ID=19829537

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7844030A Expired GB2007945B (en) 1977-11-15 1978-11-10 Circuit for suppressing noise caused by scratches on a gramophone record

Country Status (15)

Country Link
JP (1) JPS5479002A (en)
AR (1) AR216346A1 (en)
AT (1) AT357780B (en)
BE (1) BE871969A (en)
BR (1) BR7807453A (en)
CA (1) CA1110548A (en)
DE (1) DE2849375A1 (en)
ES (1) ES475021A1 (en)
FR (1) FR2408965A1 (en)
GB (1) GB2007945B (en)
HK (1) HK33882A (en)
IT (1) IT1101046B (en)
MX (1) MX147638A (en)
NL (1) NL7712534A (en)
SE (1) SE7811667L (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0039428A1 (en) * 1980-04-30 1981-11-11 Siemens Aktiengesellschaft Protection against crackle noises for digital audio programme transmission
EP0091067A1 (en) * 1982-04-05 1983-10-12 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Method of switching over the reproduction of one radio signal to another

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE430455B (en) * 1978-04-21 1983-11-14 Nippon Telegraph & Telephone RECEIVER DEVICE WITH THE FUNCTION TO COMPRESS NOISE DURING Sudden Interruptions
NL8402322A (en) * 1984-07-23 1986-02-17 Philips Nv DEVICE FOR DETECTING IMPULSE INTERFERENCES, AND A DEVICE FOR SUPPRESSING IMPULSE INTERFERENCES, INCLUDING DEVICE FOR DETECTING IMPULSE INTERFERENCES.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0039428A1 (en) * 1980-04-30 1981-11-11 Siemens Aktiengesellschaft Protection against crackle noises for digital audio programme transmission
EP0091067A1 (en) * 1982-04-05 1983-10-12 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Method of switching over the reproduction of one radio signal to another

Also Published As

Publication number Publication date
AT357780B (en) 1980-07-25
MX147638A (en) 1982-12-24
FR2408965A1 (en) 1979-06-08
BE871969A (en) 1979-05-14
SE7811667L (en) 1979-05-16
HK33882A (en) 1982-07-30
BR7807453A (en) 1979-07-17
ES475021A1 (en) 1979-04-16
AR216346A1 (en) 1979-12-14
ATA811878A (en) 1979-12-15
GB2007945B (en) 1982-05-06
IT7829694A0 (en) 1978-11-10
CA1110548A (en) 1981-10-13
JPS5479002A (en) 1979-06-23
DE2849375A1 (en) 1979-05-17
IT1101046B (en) 1985-09-28
NL7712534A (en) 1979-05-17

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Legal Events

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