SU720809A1 - Device for compensating for time distorsions of signal - Google Patents

Description

I

The invention relates to a magnetic recording technique and can be used in magnetic recording apparatus of a television signal to compensate for temporal distortion of signals.

A device for compensating temporal distortions of a signal during magnetic recording is known, containing serially connected information and reference signal reproduction amplifier, analog-code converter, buffer storage, code analog converter and low-pass filter, the first band-pass filter, whose input is connected to the output of information amplifier and the reference signal, and the output of the first bandpass filter is connected via a multiplier of the reference frequency to the second input of the analog-code converter, a second input buffer storage means connected to the output of the generator clock pulse sequence and the control unit of the magnetic carrier movement speed ktorogb two inputs connected respectively to the input and output buffer accumulator 1.

The disadvantage of this device is that the compensation of temporal distortions, especially their high-frequency components, is insufficient due to the different phase characteristics of the circuits of the reference and information signals. The compensation circuit in the device is

an open control loop, whose stable operation is determined by the parametric stability of its elements, therefore, the accuracy of compensating temporal distortions of the signal in such a device is insufficient.

The purpose of the invention is to increase the accuracy of the compensation of temporal distortion of the signal.

To achieve this goal, a device for compensating temporal distortions of a signal during magnetic recording, containing serially connected information and reference signal reproduction amplifier, analog code converter, buffer storage, code analog converter and low pass filter,

the first band-pass filter, the input of which is connected to the output of the playback amplifier of the information and reference signals, and the output of the first band-pass filter via a multiplier of the reference frequency, connect bUSrsTii-K. vt - - .- KeHtbBfopbiM input of the analog-code converter, and the second input of the buffer 8 11 1 1 8T1–– –– –– G GyoEdienne with the generator sequence of the pulse sequence, and the block with 6 6 C TV 2 with the input and output of the iSaire pulse, and the block with the 6 output signal with the input and output, the iyyy of the pulse sequence, and the block with the 6 6 , frequency Shdu MtZRTTyoMratbr of the Reference signal, at §1, the conversion of the code-analogue HSSETSHb1 gtRe71End the second band-pass filter, the phase detector and the DLT signal are connected to the input of the generator, and the other is set; mm mms mm: SbDIyen Svto th input of the phase detector is a ;;,; ....:,: ': .., - ..;.. .... „: - ..,. In the drawing there is a wiring diagram of the device ;. Arrangement to compensate for temporal distortion of the signal with magnetic; pJA.1zadis: and Contains the amplifier 1 filter 6, multiplier 7 of the reference frequency, generator 8 of this sequence of pulses, unit 9 v11r И1R1G οrkustyu Dvi - magnetic carrier, second filter 10, phase detector 11, frequency modulator 12, signal generator 13 OUT of signal. The device works as follows. The reproduced information and reference signals are amplified by the surround, playback amplifier 1, and converted into a digital code by an analog-code converter 2. From the Reference signal, selected by the bandpass filter 6, after multiplying and forming the reference frequency in the multiplier 7, the resultant is the isomalization of $ 1 in the Kytshanshman Shi V | i not a Yii information and reference signals. The samples are encoded by level in the analog-to-kD converter 2 and 6 buffer storage 3 is received from the frequency 6: 1: Wan. After memorizing the code in the buffer accumulator and removing it from the black with a stable generator frequency of 8 clock pulses after a pulse equal to the average hour, Totely multiplied by the third time signal, the error in the output signal will be largely compensated. The incomplete combination of temporal distortions, especially the components, is due to the delay of the reference signal relative to the information in filter 6 and multiplier 7, the influence of noise, spurious amplitude modulation, and other causes. Comparison of Bj |) a3qBOM detector of the 1GOPOryoto signal transmitted through the compensation factor together with the information -S t "

msfffSK: ifiSX.

Claims (1)

.K 7 9. The reduction of these distortions is achieved by controlling the error signal with a frequency generator of 8 clock pulses. In order to prevent overflow or zeroing of the buffer accumulators 3, each channel during single-channel recording, and any one during multi-channel, contains a unit for controlling the speed of movement of the magnetic carrier. This block has its own inputs for connecting to the signal input and output of the buffer accumulator 3, and output for the actuator of the magneite drive (not shown). . . ,, ,,. In a multi-device, the generator of the reference signal 13 can be general liSirtiajioB; in recording it can serve as a generator of reference signals. The control unit 9 controlling the speed of movement of the magnetic carrier may be one in each apparatus. ,, ,,,.,. The reference signal can be formed from information if the latter contains time stamps, or from a periodic signal recorded together with information or on a separate track. LH ft yspSHTsTrIleOn the drive mechanism Introduction to the device of an additional Sjyuyutnogo control loop reduces the residual time distortion, seeks the reliability of the device in a whole And thereby expands the scope of its application.,. The invention device for compensating temporal distortions of a signal during magic recording, containing serially connected information reproduction amplifier and orto JHoro system, an analog-code converter, a buffer memory, a code-analog converter and a low frequency filter, first band-pass filter, input Which is connected to the output of the playback amplifier information and reference signal Lov, and the output - through the multiplier of the reference frequency of the connection with the second input of the converter analog-code, and the second input buffer The looper is connected to the output of the clock pulse sequence generator, and the speed control unit of the magnetized system, the two inputs of which are compatible with the input and output of the buffer accumulator, characterized by a hem, which, in order to improve the accuracy of compensation for temporal distortions of the signal, a second bandpass filter was introduced. a phase detector, a frequency modulator, and a reference signal generator; the code-analogue converter output is connected through a second band-pass filter, a phase detector, and a frequency modulator in series to the input of a clock pulse sequence generator. and the output of the reference signal generator is connected to the second input of the phase detector. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 539314, cl. G II 5/04, 1975 (prototype).