JPS6481401A - Signal processor - Google Patents

Signal processor

Info

Publication number
JPS6481401A
JPS6481401A JP62239468A JP23946887A JPS6481401A JP S6481401 A JPS6481401 A JP S6481401A JP 62239468 A JP62239468 A JP 62239468A JP 23946887 A JP23946887 A JP 23946887A JP S6481401 A JPS6481401 A JP S6481401A
Authority
JP
Japan
Prior art keywords
circuits
compressing
frequency component
different compression
coefficient
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
JP62239468A
Other languages
Japanese (ja)
Other versions
JP2831996B2 (en
Inventor
Motoaki Kawasaki
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP62239468A priority Critical patent/JP2831996B2/en
Publication of JPS6481401A publication Critical patent/JPS6481401A/en
Priority to US07/666,459 priority patent/US5097336A/en
Application granted granted Critical
Publication of JP2831996B2 publication Critical patent/JP2831996B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Television Signal Processing For Recording (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

PURPOSE:To reduce the influence of a noise component in an input signal and to enable accurate amplification based upon specific amplification characteristics by providing plural compressing means which have mutually different compression characteristics. CONSTITUTION:When compressing circuits 23a and 23b which have mutually different compression characteristics are used, high-frequency component signals outputted by the compressing circuits 23a and 23b after nonlinear processing differ in level because of the different compression characteristics even if high- frequency component signals supplied from high-pass filters HPF22a and HPF22b contain similar random noises unless the levels of the random noises are large. Further, those signals are multiplied by a coefficient K/2 through coefficient multiplying circuits 25a and 25b and added by an adder 21 to an input brightness signal. Consequently, the high-frequency component signals after the nonlinear processing and coefficient multiplication processing by the compressing circuits 23a and 23b owing to the random noises become low in level and accurate nonlinear emphasis is performed.
JP62239468A 1987-09-22 1987-09-22 Signal recording device Expired - Fee Related JP2831996B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP62239468A JP2831996B2 (en) 1987-09-22 1987-09-22 Signal recording device
US07/666,459 US5097336A (en) 1987-09-22 1991-03-05 Signal processing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62239468A JP2831996B2 (en) 1987-09-22 1987-09-22 Signal recording device

Publications (2)

Publication Number Publication Date
JPS6481401A true JPS6481401A (en) 1989-03-27
JP2831996B2 JP2831996B2 (en) 1998-12-02

Family

ID=17045216

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62239468A Expired - Fee Related JP2831996B2 (en) 1987-09-22 1987-09-22 Signal recording device

Country Status (1)

Country Link
JP (1) JP2831996B2 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55142404A (en) * 1979-04-23 1980-11-07 Nippon Columbia Co Ltd Extender for dynamic range
JPS55158715A (en) * 1979-05-29 1980-12-10 Sony Corp Gain control circuit
JPS5717241A (en) * 1980-07-04 1982-01-28 Hitachi Ltd Dynamic emphasis circuit
JPS586613A (en) * 1981-07-06 1983-01-14 Pioneer Electronic Corp Noise reduction common-use circuit
JPS5880107A (en) * 1981-11-04 1983-05-14 Hitachi Ltd magnetic recording device
JPS60140932A (en) * 1983-12-27 1985-07-25 Sony Corp Pre-emphasis circuit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55142404A (en) * 1979-04-23 1980-11-07 Nippon Columbia Co Ltd Extender for dynamic range
JPS55158715A (en) * 1979-05-29 1980-12-10 Sony Corp Gain control circuit
JPS5717241A (en) * 1980-07-04 1982-01-28 Hitachi Ltd Dynamic emphasis circuit
JPS586613A (en) * 1981-07-06 1983-01-14 Pioneer Electronic Corp Noise reduction common-use circuit
JPS5880107A (en) * 1981-11-04 1983-05-14 Hitachi Ltd magnetic recording device
JPS60140932A (en) * 1983-12-27 1985-07-25 Sony Corp Pre-emphasis circuit

Also Published As

Publication number Publication date
JP2831996B2 (en) 1998-12-02

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees