SU1298953A1 - Device for recording and reading television signal - Google Patents

Abstract

The invention relates to television (TV). The purpose of the invention is to reduce the amplitude-frequency distortions horizontally and vertically while simultaneously increasing the signal-to-noise ratio. The device contains an amplifier (U) 1 record, two filters 2 and 14 low frequencies, two delay lines (LZ) 3 and 11, two attenuators 4 and 6, an inverter 5, a distribution amplifier (UR) 7, input and output switches 8 and 10, an adder 12, a read 13, a clock pulse generator 15, a control pulse driver 16, a control signal driver 17 and N write-read channels 9 each consisting of input and output switches 18 and 20 of the polarity and the device 19 with charge coupling. The goal is achieved by introducing LZ 3 and 11, attenuators 4 m 6, inverter 5, UR 7 and adder 12, which are used to extract the envelope of the TV signal amplified to the required value on the device code. The device in accordance with clause 2 of the f-ly is characterized by the fulfillment of channels 9, 1, c. f-ly, 2 ill. S yu 00

Description

The invention relates to application and broadcasting television and can be applied in a television (TV) channel multiplexing system to two or more television programs, in a TV multiplexing system with extraneous discrete information and in systems with standard conversion.

The aim of the invention is to reduce the amplitude-frequency distortions horizontally and vertically while simultaneously increasing the signal-to-sound ratio.

FIG. Figure 1 shows the electrical circuit diagram of a device for recording and reading a TV signal at an APS; Fig. 2 shows timing diagrams explaining the operation of the device.

The recording and reading device for the TV signal contains the write amplifier 1, the first low-pass filter 2, the first delay line 3, the first attenuator 4, the inverter 5, the second attenuator 6, the distribution amplifier 7, the input switch 8, N read-write channels 9 , output switch 10, second delay line It, adder 12, read amplifier 13, second low-pass filter 14, 15 clock pulse generator, control pulse driver 16, control signals driver 17, N input polarity switches 18, N devices with charge connection new (CCD)

19, N output switches 20 of the polarity.

The device works as follows. ,

The processed TV signal is parallelized with a clock frequency corresponding to the Kotel'nikov theorem (Fig. 2a, b) in the N output first delay line 3 and the distribution amplifier 7 for N channel groups of N channels in each group such that the input switch 8 forms at the inputs of N identical write-read channels 9 a sequence of N samples of the same name, where Ne N-1 samples have amplitude reduced in proportion to the total transfer inefficiency in write-read channel 9 and perform the functions of sample drums.

The polarity of the samples in the write-read channels 9 is reversed with an odd-multiple 35

40

the second attenuator 6, (figure 2 D, e).

The input switch 8 samples the TV signal at a frequency according to the Kotelnikov theorem (Fig. 2a) in such a way that a sequence of five samples corresponding to one element of the TV signal e is formed at the input of each write-read channel 9 (Fig. 2j, 3jH ), and the first channel includes the samples marked with the index 1, the next 1st channel with the index 2, the last with the index 5.

The sequences of groups of samples from the outputs of the input switches 18 of the polarity are electrically introduced into the CCD 19. The read sequences of groups of samples are brought to a single polarity50

nonempty

ti in the output switches 20 polnnul for each group ,. nosti. Thus, at the inputs of the output switch 10 there are sequences of three samples of the same name as a result of the fact that the compensating samples, eliminating the possibility of

s

0

5 jp

five

half the frequency of the TV signal lines to reduce the visibility of crosstalk between adjacent elements. Vertical.

The output switch 10 generates N-2 sequences of samples of the TV signal, which, after eliminating the time error in the second delay line 11, are summed in the adder 12.

Let us consider the operation of the device in more detail on the example of 5 write-read channels (Fig. 1).

The TV video signal amplified to the required value in the recording amplifier 1 and limited in spectral composition by the first low-pass filter 2 is fed to the first delay line 3. Signals delayed relative to each other for the duration of one TV element through the distribution amplifier 7 are fed to the input switch 8 of five write-read channels 9 (Fig. 2b, c, d, e, f), and at the fourth inputs of the input switch 8 TV signal enters weakened in attenuator 4 and polarity changed in inverter 5, and to the fifth inputs weakened in attenuator 6. The attenuation coefficient of the first attenuator 4 is chosen equal to K cdxM, where ui is the inefficiency of one transfer, and M is the number of transfers , coefficient value and weakening

0

the second attenuator 6, (figure 2 D, e).

The input switch 8 samples the TV signal at a frequency according to the Kotelnikov theorem (Fig. 2a) in such a way that a sequence of five samples corresponding to one element of the TV signal e is formed at the input of each write-read channel 9 (Fig. 2j, 3jH ), and the first channel includes the samples marked with the index 1, the next 1st channel with the index 2, the last with the index 5.

The sequences of groups of samples from the outputs of the input switches 18 of the polarity are electrically introduced into the CCD 19. The read sequences of groups of samples are brought to a single polarity

the effect of transfer inefficiency on signal samples is destroyed after all acts of transfer (Fig. 2k, l).

The output switch 10 generates three sequences of samples, corresponding to a BevcTByronmfx input TV signal, which, after compensating for the relative time delay in the second delay line 11 (Fig. 2k, l, m), are summed in adder 12, which improves the signal-to-noise ratio.

The second low-pass filter 14 selects the envelope of the TV signal samples amplified to the required value in the read amplifier 13.

The control and synchronization of the operation of the device is provided by a generator 15 of clock pulses, a driver of the 16 control pulses, a CCD 19 and a driver 17 of the control signals for the input and output switches 8 and 10, the input and output switches 18 and 20 polarity.

Claims (2)

1. A device for recording and reading a television signal containing a series-connected recording amplifier and a first low-pass filter whose input switch, N outputs of which are connected to the inputs of the corresponding N write-read channels, the first control input of each of which is connected to the corresponding output of the driver pulses, the input of which is connected to the first output of the clock pulse generator, an output switch, whose N inputs are connected to the outputs of the corresponding write-read channels Serially connected amplifier and the read second lowpass filter driver control signals. The first and second outputs of which are connected to the control inputs of the input and output switches, and the input is connected to the second output of the clock pulse generator, characterized in that, in order to reduce the amplitude-frequency distortion in the horizontal direction while simultaneously increasing the signal-to-noise ratio, the first and second delay lines, the first and second attenuators, the inverter, the distribution amplifier, and the adder, the output of the first low-pass filter connected to the input of the first delay line, the N-2 first outputs of which are connected Eny with the corresponding inputs. Amplifier distributor directly, (H-1) -th output is connected to the corresponding input of the amplifier-distributor through serially connected first attenuator and inverter, and the Nth input is connected to the corresponding input of the amplifier-distributor through the second attenuator , while each of the N output groups of the amplifier-distributor is connected to the corresponding inputs of the internal switch, N-2 outputs of the output switch are connected via serially connected second delay line and su A mapper with an input to the read amplifier, wherein the second and third control inputs of each write-read channel are connected to the third and fourth outputs of the control signal generator. 2. The device according to claim 1, characterized in that, in order to reduce the amplitude-frequency distortions in the vertical direction, each of the N write-read channels is designed as a series-connected polarity input switch, whose input is the input of the write channel a readout device with a charge connection, the control input of which is the first control input of the write-read channel, and an output polarity switch, the output of which is the output of the write-read channel, while the control inputs of both switches are polar These are the second and third write-read channel control inputs. and LJOTU J JlJnJlJnJTrijnj 5c L 1 Z 3 JL 567 1 Z 3. . 567 i-) / 7 2 3 5 6 r 2 22 2 2 7 7 IT I -r I -rU g 5 5 5 5 u. P. 666 ggpp j - 5 5 5 J1JU1 Lll ll Mb 1 2 3 L-g-c-shlgig gllLLL. ( j - j-iJlJ lrijT.4jTJTrLrL t FIG. 2 Compiled by G.Rosatkevich Editor A.Shandor Tehred A.Kravchuk Proofreader I.Muska Order 901/61 Circulation 639. Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4