JPS54118727A - Noise level detector circuit - Google Patents
Noise level detector circuitInfo
- Publication number
- JPS54118727A JPS54118727A JP2685778A JP2685778A JPS54118727A JP S54118727 A JPS54118727 A JP S54118727A JP 2685778 A JP2685778 A JP 2685778A JP 2685778 A JP2685778 A JP 2685778A JP S54118727 A JPS54118727 A JP S54118727A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- video signal
- correlation
- output
- noise level
- 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
Links
Landscapes
- Picture Signal Circuits (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Abstract
PURPOSE: To perform the detection for the noise level contained in the video signal by utilizing positively the inter-frame correlation, the inter-line correlation and the approximation correlation for isolation between the video signal and the noise.
CONSTITUTION: In the detector circuit which detects the noise level contained in the TV video signal to be supplied terminal 1, the input video signal is applied to 1-frame delay unit 2 and subtractor 3 to eliminate the video signal component of the frame correlation degree and then supplied to absolute value circuit 6. Furthermore, the output of circuit 6 is applied to 277Z memory 4 which delays the 227 subcarrier period as well as to subtractor 5. Thus, the video signal component featuring a high inter-line correlation is eliminated, and the output is supplied to absolute value circuit 7. After this, the isolation is given between the high and low parts of the correlation degree for the input video signal. Then the output of circuit 7 is applied to averaging circuit 9 via square circuit 8, and the signals taken into circuit 9 are selected via averaging control circuit 10 to give the square averaging to the output signal of circuit 7 on the time axis.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2685778A JPS54118727A (en) | 1978-03-08 | 1978-03-08 | Noise level detector circuit |
GB08213209A GB2102236B (en) | 1978-03-08 | 1979-03-05 | Noise reduction system for colour television signal |
GB7907699A GB2020508B (en) | 1978-03-08 | 1979-03-05 | Noise reduction system for colour television signal |
GB08213210A GB2102651B (en) | 1978-03-08 | 1979-03-05 | Noise reduction system for color television signal |
FR7905906A FR2419637A1 (en) | 1978-03-08 | 1979-03-07 | NOISE REDUCTION DEVICE FOR COLOR TELEVISION SIGNALS |
CA000322983A CA1117650A (en) | 1978-03-08 | 1979-03-08 | Noise reduction system for color television signal |
US06/018,474 US4242704A (en) | 1978-03-08 | 1979-03-08 | Noise reduction system for color television signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2685778A JPS54118727A (en) | 1978-03-08 | 1978-03-08 | Noise level detector circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54118727A true JPS54118727A (en) | 1979-09-14 |
JPS6154317B2 JPS6154317B2 (en) | 1986-11-21 |
Family
ID=12204940
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2685778A Granted JPS54118727A (en) | 1978-03-08 | 1978-03-08 | Noise level detector circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54118727A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58156270A (en) * | 1982-03-11 | 1983-09-17 | Mitsubishi Electric Corp | Signal processing method |
JPS63132518A (en) * | 1986-04-11 | 1988-06-04 | ビデオ・パテンツ・リミテッド | Noise control type circulation filter |
US6169583B1 (en) | 1996-05-24 | 2001-01-02 | Matsushita Electric Industrial Co., Ltd. | Method and circuit to determine a noise value that corresponds to the noise in a signal |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0513142Y2 (en) * | 1988-07-01 | 1993-04-07 |
-
1978
- 1978-03-08 JP JP2685778A patent/JPS54118727A/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58156270A (en) * | 1982-03-11 | 1983-09-17 | Mitsubishi Electric Corp | Signal processing method |
JPS63132518A (en) * | 1986-04-11 | 1988-06-04 | ビデオ・パテンツ・リミテッド | Noise control type circulation filter |
US6169583B1 (en) | 1996-05-24 | 2001-01-02 | Matsushita Electric Industrial Co., Ltd. | Method and circuit to determine a noise value that corresponds to the noise in a signal |
Also Published As
Publication number | Publication date |
---|---|
JPS6154317B2 (en) | 1986-11-21 |
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