JPS57198512A - Noise reduction device - Google Patents

Noise reduction device

Info

Publication number
JPS57198512A
JPS57198512A JP8172481A JP8172481A JPS57198512A JP S57198512 A JPS57198512 A JP S57198512A JP 8172481 A JP8172481 A JP 8172481A JP 8172481 A JP8172481 A JP 8172481A JP S57198512 A JPS57198512 A JP S57198512A
Authority
JP
Japan
Prior art keywords
signal
audio multiplex
multiplex signal
noise reduction
amplifiers
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
JP8172481A
Other languages
Japanese (ja)
Inventor
Tsuneo Tateshimo
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP8172481A priority Critical patent/JPS57198512A/en
Publication of JPS57198512A publication Critical patent/JPS57198512A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G11B20/22—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing distortions

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To increase the quality of recording and reproduction of a normal signal, through specific circuit constitution, in a magnetic recorder and reproducer which can record and reproduce an audio multiplex signal. CONSTITUTION:A band pass filter 32 has a band pass characteristic for a pilot signal of an audio multiplex signal, a detector 33 outputs a discriminating signal whether or not an input signal is an audio multiplex signal and the output is applied to a control terminal of amplifiers 22 and 35. The suffix (a) of a changeover switch is selected at the recording mode and the (b) is at the reproduction mode. When an audio multiplex signal is inputted to a terminal 21, the pilot signal is detected and the level is controlled to a specified level at the amplifiers 22 and 35, and when a signal not being the audio multiplex signal is inputted at the recording mode, the control of the gain of the amplifier is made and the input is amplified by about 6 dB in comparison with the amplification of the main signal at the audio multiplex signal processing. Thus, the noise reduction can effectively be made.
JP8172481A 1981-05-28 1981-05-28 Noise reduction device Pending JPS57198512A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8172481A JPS57198512A (en) 1981-05-28 1981-05-28 Noise reduction device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8172481A JPS57198512A (en) 1981-05-28 1981-05-28 Noise reduction device

Publications (1)

Publication Number Publication Date
JPS57198512A true JPS57198512A (en) 1982-12-06

Family

ID=13754355

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8172481A Pending JPS57198512A (en) 1981-05-28 1981-05-28 Noise reduction device

Country Status (1)

Country Link
JP (1) JPS57198512A (en)

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