ES475021A1 - Record noise suppression system - Google Patents

Record noise suppression system

Info

Publication number
ES475021A1
ES475021A1 ES475021A ES475021A ES475021A1 ES 475021 A1 ES475021 A1 ES 475021A1 ES 475021 A ES475021 A ES 475021A ES 475021 A ES475021 A ES 475021A ES 475021 A1 ES475021 A1 ES 475021A1
Authority
ES
Spain
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.)
Expired
Application number
ES475021A
Other languages
Spanish (es)
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 ES475021A1 publication Critical patent/ES475021A1/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
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Confectionery (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

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).
ES475021A 1977-11-15 1978-11-13 Record noise suppression system Expired ES475021A1 (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 (1)

Publication Number Publication Date
ES475021A1 true ES475021A1 (en) 1979-04-16

Family

ID=19829537

Family Applications (1)

Application Number Title Priority Date Filing Date
ES475021A Expired ES475021A1 (en) 1977-11-15 1978-11-13 Record noise suppression system

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)

Families Citing this family (4)

* 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
DE3016779C2 (en) * 1980-04-30 1986-09-18 Siemens AG, 1000 Berlin und 8000 München Click protection for digital audio program transmission
DE3212615C2 (en) * 1982-04-05 1984-09-06 Bayerische Motoren Werke AG, 8000 München Method for switching the reproduction of a broadcast signal to another broadcast signal and circuit arrangement for carrying out the method
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.

Also Published As

Publication number Publication date
SE7811667L (en) 1979-05-16
HK33882A (en) 1982-07-30
JPS5479002A (en) 1979-06-23
GB2007945A (en) 1979-05-23
MX147638A (en) 1982-12-24
AT357780B (en) 1980-07-25
AR216346A1 (en) 1979-12-14
BR7807453A (en) 1979-07-17
NL7712534A (en) 1979-05-17
GB2007945B (en) 1982-05-06
FR2408965A1 (en) 1979-06-08
CA1110548A (en) 1981-10-13
BE871969A (en) 1979-05-14
DE2849375A1 (en) 1979-05-17
IT1101046B (en) 1985-09-28
IT7829694A0 (en) 1978-11-10
ATA811878A (en) 1979-12-15

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