Television signal processing device

专利摘要:
A DEVICE FOR TREATING A TELEVISION SIGNAL comprising a series-connected first buffer amplifier, a delay unit, a first adder and a compensating delay unit, a second adder, the first million low frequencies, the output of which is connected to the output of the third adder, the output of which is a luminance signal, a band-pass filter, the output of which is the output of the chroma signal, the inverter, the frequency multiplier, whose input is the input of the color subcarrier frequency, and the output through the clock generator A diner with control inputs of a delay unit, a first smoothing amplifier, characterized in that, in order to improve the quality of the image, a second buffer amplifier, the first and second equalizer delay blocks, the second smoothing amplifier and the second low-pass filter are inserted, the input the first buffer amplifier is combined with the inputs of the inverter and the second buffer amplifier, the output of which is connected through the first delay unit to the second input of the first adder, and the output of the inverter through the second input The delay unit is connected to the B input of the second sumAl torus, the second input of which is connected to the second 4 output of the delay unit, the output is connected to the input of the second smoothing amplifier, the first output of which is connected to the input of the first low-pass filter, and the second output is connected to the input of the bandpass filter, except for Moreover, the first smoothing amplifier is switched on by the output of the block of the compensating delay and the second input of the third adder through the second filter to the low frequencies. . ABOUT)
公开号:SU1158056A3
申请号:SU782599298
申请日:1978-03-24
公开日:1985-05-23
发明作者:Гарольд Притчард Дальтон
申请人:Рка Корпорейшн (Фирма)；
IPC主号:

专利说明:

I The invention relates to the field of television f, in particular, to devices for extracting a brightness signal or a chroma signal from a full color television (TV) signal. The aim of the invention is to improve the image quality. The drawing shows a structural electrical circuit of a device for processing television signals. The device for processing television signals contains the first buffer amplifier 1 delay unit 2, the first adder 3, the compensating delay unit 4, the first smoothing amplifier 5, the second buffer amplifier b, the first equalizing delay unit 7, the inverter 8, the second equalizing delay unit 9, the second sump 10, second smoothing amplifier 11, first lower filter 12 (low pass filter), second low pass filter 13, third sumat 14, salt filter 15, smart frequency frequency 16 and clock generator 17. The device works as follows. The full color TV signal arrives simultaneously through the first and second buffer amplifiers 1 and 6 and the inverter 8 to the inputs of blocks 2.7 and 9. The first equalizing unit 7 has a delay of N periods of the clock frequency of the generator 17, the unit 2 has a delay of one line and N periods of the so-called frequency, and the second leveling unit 9 also has N periods. All three blocks 2.7 and 9 are made on charge-coupled devices (CCD), which are controlled by the signals of generator 17. The signals from the outputs of blocks 2 and 7 are sent to the first adder 3, where combining the luminance signal is performed. This signal is additionally delayed in block 4, processed in the first smoothing of amplifier 5, and the output of the second low-pass filter 13 shows a luminance signal in the band up to 5 MHz, which does not contain the components of the signal from the HaetHocTH signal. the second adder 10, dd is a comb filtering of the chroma signal. The latter is processed in the second smoothing amplifier 11 and from its first 6th turn is fed to the first low-pass filter 12, where a vertical signal is generated in the band up to 1.5 MHz. The vertical signal is summed in the third adder 14 with a luminance signal and is output. devices. The signal from the second output of the second anti-aliasing amplifier 11 is fed to the input of the band-pass filter 15, at the output of which a chroma signal is generated. At the same time, the color subcarrier frequency arrives at the input of the multiplier 16, which triples and is converted in the generator 17 into a sequence of clock pulses for the CCD. In the proposed embodiment of the device and block 2, the TV-dial is delayed by 68255 + 1 period of the clock frequency. With a color subcarrier frequency of 3.579545 MHz, the delay time between blocks 2.7 and 9 is 63.555 ISS. The need to introduce a half cascade delay in block 2 is associated with the choice of the synchronization frequency. The frequency is chosen to be equal to the triple frequency of the color subcarrier to satisfy the Nyquist criterion, and to provide the required stability of the synchronization signals without complicating the generation of synchronization signals. The delayed discrete signals are fed to the inputs of the first and second adders 3 and 10. The components (components) of non-interlacing frequencies. each other. The additional high-frequency components above and below the synchronization frequency are removed by the first and second low-pass filters 12 and 13. The combinately filtered luminance signal at the output of the first adder 3 essentially does not contain the components of the chroma signal. Consequently, the image reproduced from such a luminance signal is free from the effects of dashes and line creeping over large areas of a color image and along the vertical edges that occur in conventional TV-processing systems without comb filtering.
3 11580564
which limits the sig-ation frequency of 10.7 MHz), and evens out the zonal resolution. Block 4 can be comb-filtered
more fully in the form of a cascade line of eduged signal luminance relative to
ki on a CCD having a delay of 186 non-signal vertical definition,
(each stage of each line creates one that passes through the first
the delay 93 is not at the frequency of the sync sync-low-pass filter 12.
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L "rrr

权利要求:
Claims (1)
[1]
DEVICE FOR PROCESSING TELEVISION SIGNALS, comprising a first buffer amplifier, a delay unit, a first adder and a compensating delay unit, a second adder, a first low-pass filter, the output of which is connected to the output of the third adder, the output of which is the output of the brightness signal, bandpass filter, output which is the output of the color signal, an inverter, a frequency multiplier, the input of which is the input of the color subcarrier frequency, and the output through the clock generator is connected to the control inputs of the delay unit, the first smoothing amplifier, characterized in that, in order to improve image quality, a second buffer amplifier, first and second equalization delay units, a second smoothing amplifier and a second low-pass filter are introduced into it, while the input of the first the buffer amplifier is combined with the inputs of the inverter and the second buffer amplifier, the output of which is connected through the first equalizing delay unit to the second input of the first adder, and the output of the inverter through the second equalizing delay unit ki soe- _Λ of the connections to the second input of the second summa- torus 3, a second input coupled to the second output of the delay unit, an output connected to an input of the second smoothing amplifier, a first output coupled to an input of the first lowpass filter and a second output connected to the input of the bandpass filter, the first smoothing amplifier is connected between the output of the compensating delay unit and the second input of the third adder through the second low-pass filter.
*

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法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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US05/781,303|US4096516A|1977-03-25|1977-03-25|Electronic signal processing apparatus|

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