CN1104809C - SECAM video signal recording/reproducing apparatus having function of picture quality compensation - Google Patents
SECAM video signal recording/reproducing apparatus having function of picture quality compensation Download PDFInfo
- Publication number
- CN1104809C CN1104809C CN95121725A CN95121725A CN1104809C CN 1104809 C CN1104809 C CN 1104809C CN 95121725 A CN95121725 A CN 95121725A CN 95121725 A CN95121725 A CN 95121725A CN 1104809 C CN1104809 C CN 1104809C
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- China
- Prior art keywords
- signal
- carrier chrominance
- burst
- output
- chrominance signal
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- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/86—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded sequentially and simultaneously, e.g. corresponding to SECAM-system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/793—Processing of colour television signals in connection with recording for controlling the level of the chrominance signal, e.g. by means of automatic chroma control circuits
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
The present invention relates to an SECAM system video signal recording/reproducing device which has an image quality compensating function. This device is provided with a 4.3 MHz band-pass filter which passes only a chroma signal, a 4.28 MHz bell filter which emphasizes the chroma signal that passes through the 4.3 MHz band-pass filter and an image quality compensation circuit which amplifies the size of a chroma signal in accordance with the fluctuation of a burst level to a reference signal. It is further provided with a limiter to fixedly limit the amplitude of a chroma signal and eliminates noise and an amplitude modulation part and a low-pass conversion circuit which performs low-pass conversion of the frequency of chroma signal that is outputted from the limiter.
Description
The present invention relates to a kind of SECAM (order transmits and the colour signal system of storage) video signal recording/reproducing device that has the compensating images quality function, or rather, relate to a kind of burst signal level and compensate the level of a carrier chrominance signal with SECAM video signal recording/reproducing device this vision signal of resetting, that have the function of compensating images quality decline by the SECAM vision signal.
Fig. 1 is a calcspar, is used for being illustrated in the recording process of a carrier chrominance signal in a kind of SECAM video signal recording/reproducing device of routine.A band pass filter (BPF) 11 receives a composite video signal so that only separate and export this carrier chrominance signal.Though the logical filter 11 of band should have the centre frequency of its 4.28MHz, in fact this BPF has the centre frequency of 4.3MHz, so that centre frequency differs 0.02MHz, and this does not cause any problem from the viewpoint of performance.When vision signal when send a broadcasting station, because this vision signal is by an anti-bell filter, so a frequency modulation carrier chrominance signal changes a luminance signal in a black and white television set.The signal of being changed appears on its screen then, so and generation point-like noise.Therefore, this carrier chrominance signal is by band pass filter 11, then by a bell filter 12, makes this carrier chrominance signal evenly and prevent to produce the point-like noise whereby.Carrier chrominance signal may comprise noise between transmission period or this signal and itself decay into amplitude modulation.Therefore, an amplitude limiter 13 receives the output of bell filter 12 so that the amplitude of this carrier chrominance signal is become evenly, separates and removing noise and amplitude modulation component, and removes them, then to the remaining signal component of a frequency divider 14 outputs.Frequency divider 14 is the carrier chrominance signal low pass conversion from amplitude limiter 13 outputs.Through the carrier chrominance signal of low pass conversion BPF15, increase the weight of at bell filter 16 places of a 1.072MHz, then to 17 outputs of an adder by a 1.1MHz.Adder 17 is added on a frequency inverted luminance signal to this lowpass frequency conversion carrier chrominance signal.
Composite video signal A that Fig. 2 A represents to send from the broadcasting station as a frequency range, Fig. 1.Fig. 2 B represents the signal by 4.3MHz BPF11, and this signal is equivalent to the label X among Fig. 1.Fig. 2 C represents the signal that will write down on tape, promptly in adder 17 lowpass frequency conversion carrier chrominance signal is added on the signal that the frequency inverted luminance signal is respectively obtained, and this signal is equivalent to the label S among Fig. 1.
In general, SECAM VHS (video home system) form can not use autochroma controller (ACC) but come record with the direct writing-method of a kind of frequency, and this method can not be used for PAL (line-by-line inversion S-SYSTEM) system or NTSC (colour television standard that the American National television system committee formulates) system.Therefore, if the burst signal level that will import is very low, the SECAM quality video signal that then will write down descends, and causes and produce the carrier chrominance signal noise when resetting this vision signal.In other words, because the compensating circuit that SECAM video signal recording/reproducing device does not change the chroma level of picture signal, a problem that exists is: according to the input state of this carrier chrominance signal, the play capability of image quality reduces because of the record format characteristic of lowpass frequency conversion SECAM vision signal.
Therefore, in order to overcome the above problems, one object of the present invention is, a kind of SECAM video signal recording/reproducing device that has the function of compensating images quality is provided, way is to detect burst signal and change according to the burst signal level to amplify this vision signal from a composite video signal, so that record institute amplifying signal.
In order to realize above purpose, the invention provides a kind of SECAM video signal recording/reproducing device that has the function of compensating images quality, this equipment comprises: one is used for from a composite video signal of being sent by the broadcasting station removing luminance signal and the 4.3MHz band pass filter by carrier chrominance signal only; A 4.28MHz bell filter that is used for increasing the weight of by the carrier chrominance signal of this 4.3MHz band pass filter; Output that is used for receiving this 4.3MHz band pass filter and burst gating pulse be so that change according to the burst signal level and to produce direct voltage, and receive the output of this 4.28MHz bell filter so that amplify the image quality compensating circuit of this carrier chrominance signal with respect to the variation of a reference signal according to the burst signal level; One is used for receiving the output of this bell filter so that the amplitude of this carrier chrominance signal is become evenly and removes the amplitude limiter of noise and amplitude modulation component from this carrier chrominance signal; And the low pass change-over circuit of the frequency of this carrier chrominance signal that is used for the output of four fens these amplitude limiters.
In a kind of SECAM video signal recording/reproducing device of the function that has a compensating images quality, preferably this image quality compensating circuit comprises output and this burst gating pulse that is used for receiving this 4.3MHz band pass filter, so that produce the burst signal level detector of direct voltage according to the burst signal level; And an output that is used for receiving output voltage He this 4.28MHz bell filter of this burst signal level detector, so that amplify the voltage-adjusting amplifier of the size of this composite signal with respect to the variable quantity of described reference signal according to this burst signal level.In addition, preferably this voltage-adjusting amplifier amplifies difference between the output voltage of the burst signal level that is in a kind of standard state and this burst signal level detector.
In order to realize other purposes of the present invention, the present invention also provides a kind of SECAM video signal recording/reproducing device of the function with the compensating images quality, and this equipment comprises: one is used for removing luminance signal from a composite video signal of being sent by the broadcasting station and the 4.3MHz band pass filter by carrier chrominance signal only; A 4.28MHz bell filter that is used for increasing the weight of by the carrier chrominance signal of this 4.3MHz band pass filter; This composite signal that is used for receiving by the bell filter institute filtering of this 4.28MHz is so that be amplified to the composite signal of this process filtering in a kind of amplifier of predetermined amplitude; One with the output that receives this amplifier, so that the amplitude of this carrier chrominance signal is become uniformly and removes the amplitude limiter of noise and amplitude modulation component from this carrier chrominance signal; And one be used for four fens frequencies from this tonal signaling of this amplitude limiter output, so that low pass is changed the low pass change-over circuit of this four fens frequencies.
Describe most preferred embodiments more of the present invention in detail by contrasting all accompanying drawings, above purpose of the present invention and advantage will become clearer.In these accompanying drawings:
Fig. 1 is a calcspar, is used for being illustrated in the recording process of a carrier chrominance signal in a kind of SECAM video signal recording/reproducing device of routine;
A signal of the every part shown in Fig. 2 A to 2C presentation graphs 1;
Fig. 3 A is a calcspar, is used for representing an embodiment according to the SECAM video signal recording/reproducing device of a kind of function that has a compensating images quality of the present invention;
Fig. 3 B is a calcspar, is used for representing another embodiment according to the SECAM video signal recording/reproducing device of a kind of function with the compensating images quality of the present invention;
A signal of the every part shown in Fig. 4 A to 4D presentation graphs 3A; And
Fig. 5 is the circuit diagram that is used for implementing a detector shown in Fig. 3 A.
Hereinafter will contrast all accompanying drawings and describe the present invention in detail.
Fig. 3 A is a calcspar, is used for representing an embodiment according to the SECAM video signal recording/reproducing device of a kind of function that has a compensating images quality of the present invention.Contrast Fig. 3 A, this video signal recording/reproducing device comprise that one is used for removing luminance signal from a composite video signal of being sent by the broadcasting station and the 4.3MHz band pass filter 11 by carrier chrominance signal only; A 4.28MHz bell filter 12 that is used for increasing the weight of by the carrier chrominance signal of 4.3MHz band pass filter 11; Output that is used for receiving 4.3MHz band pass filter 11 and burst gating pulse (BGP) produce direct voltage so that change according to the burst signal level, and the output of reception 4.28MHz bell filter 12, so that amplify the image quality compensating circuit 20 of this carrier chrominance signal with respect to the variation of a reference signal according to this sync signal level; An output that is used for receiving image quality compensating circuit 20 is so that become the amplitude of this carrier chrominance signal uniformly and remove the amplitude limiter 13 of noise and amplitude modulation component; And one be used for four fens frequency dividers 14 from the frequency of this carrier chrominance signal of amplitude limiter 13 output.
Voltage-adjusting amplifier 24 had both received the output signal of 4.24MHz bell filter 12, received again from the direct voltage D of burst signal level detector 22 outputs, so that set and the relevant gain of burst signal level that is in a kind of standard state.Then, amplifier 24 changes the output signal of amplifying 4.28MHz bell filter 12 as the difference of direct voltage greatly according to the burst signal level, and to amplitude limiter 13 output institute amplifying signals.Amplitude limiter 13 becomes the amplitude of the carrier chrominance signal of exporting from voltage-adjusting amplifier 24 evenly and removes noise and amplitude modulation component, whereby to the remaining signal of frequency divider 14 outputs.The conversion of frequency divider 14 low passes is from the carrier chrominance signal of amplitude limiter 13 outputs, and the carrier chrominance signal through the low pass conversion increases the weight of in a 1.07MHz bell filter 16 by a 1.1MHzBPF15 then, and to 17 outputs of an adder.Adder 17 is added on this frequency inverted luminance signal to this lowpass frequency conversion SECAM carrier chrominance signal.
Fig. 3 B is a calcspar, is used for representing another embodiment according to the SECAM video signal recording/reproducing device of a kind of function that has a compensating images quality of the present invention.This video signal recording/reproducing device comprises and is used for from the composite video signal of being sent by the broadcasting station removing luminance signal and only by the 4.3MHz band pass filter 11 of carrier chrominance signal, is used for increasing the weight of the 4.28MHz bell filter 12 by the carrier chrominance signal of 11 filtering of 4.3MHz band pass filter; A carrier chrominance signal that is used for receiving by 12 filtering of 4.28MHz bell filter is so that be amplified to this carrier chrominance signal in the amplifier 26 of pre-sizing; And be used for the output of reception amplifier 26, so that the amplitude of this carrier chrominance signal is become uniformly and removes the amplitude limiter 13 of noise and amplitude modulation component.
Composite video signal A among Fig. 3 A that Fig. 4 A represents to be sent by the broadcasting station on a frequency plane.Fig. 4 B represents the burst signal B among Fig. 3 A of input burst signal level detector 22 on a frequency axis.Fig. 4 C represents the burst gating pulse C among Fig. 3 A of input burst signal level detector 22 on a time shaft.Fig. 4 D represents from the direct voltage of burst signal level detector 22 outputs.
Fig. 5 is the circuit diagram that is used for realizing the detector 22 among Fig. 3 A.Contrast Fig. 5 be fed to the base stage of a transistor Q2 by the carrier chrominance signal B of 11 filtering of 4.3MHz band pass filter, and BGPC is fed to the base stage of a transistor Q1, so that transistor Q1 is " leading to " during the BGP gating.So carrier chrominance signal B is amplified by transistor Q2,, by a diode D1, a resistor R 6 and a capacitor C3, cause generation whereby simultaneously as the direct voltage among Fig. 4 D so that make burst signal charging and discharge.
As mentioned above, according to the SECAM video signal recording/reproducing device that has the function of compensating images quality of the present invention, receive the output and the burst gating pulse of this 4.3MHz band pass filter, so that variation produces direct voltage according to the burst signal level, and receive the output of this 4.28MHz bell filter, so that amplify carrier chrominance signal with respect to the variation of reference signal, so that improvement is according to the image quality of the recording/reproducing of this carrier chrominance signal according to the burst signal level.
Claims (3)
1. SECAM video signal recording/reproducing device that has the function of compensating images quality comprises:
One is used for from a composite video signal removing luminance signal and the 4.3MHz band pass filter by carrier chrominance signal only;
A 4.28MHz bell filter that is used for increasing the weight of by this carrier chrominance signal of described 4.3MHz band pass filter;
An output that is used for receiving output, burst gating pulse and the described 4.28MHz bell filter of described 4.3MHz band pass filter is so that amplify the image quality compensating circuit of the size of this carrier chrominance signal with respect to the variation of a reference signal according to the burst signal level;
An output that is used for receiving described image quality compensating circuit so that the amplitude of this carrier chrominance signal is become evenly, and is removed the amplitude limiter of noise and amplitude modulation component from this carrier chrominance signal; And
One is used for the low pass conversion low pass change-over circuit from the frequency of this carrier chrominance signal of described amplitude limiter output.
2. the SECAM video signal recording/reproducing device of the function described in claim 1 with compensating images quality, wherein said image quality compensating circuit comprises the above-mentioned output and this burst gating pulse that are used for receiving described 4.3MHz band pass filter, so that produce the burst signal level detector of direct voltage according to this burst signal level; With an output that is used for receiving the output voltage and the described 4.28MHz bell filter of described burst signal level detector, so that amplify the voltage-adjusting amplifier of the amplitude of this carrier chrominance signal with respect to the variable quantity of described reference signal according to this burst signal level.
3. the SECAM video signal recording/reproducing device of the function that has the compensating images quality described in claim 2, wherein said voltage-adjusting amplifier comprise the device of the difference between the output voltage that is used to amplify the burst signal level that is in a kind of standard state and described burst signal level detector.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940040132A KR0151018B1 (en) | 1994-12-30 | 1994-12-30 | A picture compensation with secam system video signal in writing and reproducing device |
| KR40132/1994 | 1994-12-30 | ||
| KR40132/94 | 1994-12-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1132977A CN1132977A (en) | 1996-10-09 |
| CN1104809C true CN1104809C (en) | 2003-04-02 |
Family
ID=19405999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95121725A Expired - Fee Related CN1104809C (en) | 1994-12-30 | 1995-12-29 | SECAM video signal recording/reproducing apparatus having function of picture quality compensation |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH08251623A (en) |
| KR (1) | KR0151018B1 (en) |
| CN (1) | CN1104809C (en) |
| FR (1) | FR2729035B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100598016B1 (en) * | 2004-10-25 | 2006-07-06 | 삼성전자주식회사 | Secam chrominance signal decoding method and secam chrominance signal decoder using the same |
| JP4983415B2 (en) * | 2007-06-11 | 2012-07-25 | ソニー株式会社 | Image signal processing apparatus, image signal processing method, and program |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4220964A (en) * | 1977-11-21 | 1980-09-02 | Sony Corporation | Secam recording and reproducing system |
| EP0626795A2 (en) * | 1993-05-27 | 1994-11-30 | Kabushiki Kaisha Toshiba | Secam chroma processing circuit and automatic frequency adjusting circuit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE791543A (en) * | 1971-11-19 | 1973-03-16 | Sony Corp | MAGNETIC RECORDING SYSTEM OF A COMPOSITE COLOR TELEVISION SIGNAL |
| FR2160757B3 (en) * | 1971-11-26 | 1974-08-19 | Int Electronic Dist | |
| JPS5981990A (en) * | 1982-11-02 | 1984-05-11 | Victor Co Of Japan Ltd | Color video signal recording device and recording and reproducing device |
-
1994
- 1994-12-30 KR KR1019940040132A patent/KR0151018B1/en not_active IP Right Cessation
-
1995
- 1995-12-25 JP JP7337432A patent/JPH08251623A/en active Pending
- 1995-12-27 FR FR9515569A patent/FR2729035B1/en not_active Expired - Fee Related
- 1995-12-29 CN CN95121725A patent/CN1104809C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4220964A (en) * | 1977-11-21 | 1980-09-02 | Sony Corporation | Secam recording and reproducing system |
| EP0626795A2 (en) * | 1993-05-27 | 1994-11-30 | Kabushiki Kaisha Toshiba | Secam chroma processing circuit and automatic frequency adjusting circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2729035A1 (en) | 1996-07-05 |
| FR2729035B1 (en) | 1998-04-30 |
| KR0151018B1 (en) | 1998-10-15 |
| KR960025625A (en) | 1996-07-20 |
| CN1132977A (en) | 1996-10-09 |
| JPH08251623A (en) | 1996-09-27 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20030402 Termination date: 20100129 |