SU766038A1 - Method of transmitting time and standard frequency signals in compression signal - Google Patents

Description

one

The invention relates to a communication technique and can be used to assign spatially separated time scales, centralized clock detection and verification of exemplary measures of time and frequency.

A known method of transmitting time signals and a reference frequency in a television signal, consisting in mixing the reference frequency into the first half of the nth line (where is the line number) of the television signal, generating high frequency clock pulses from the reference frequency, converting the parallel time code to serial code the frequency of the high-frequency clock pulses, mixing the received signal at a high clock frequency into the second half of the U -th lines of the TV signal l

However, the limestone method does not provide sufficient noise immunity.

The purpose of the invention is to improve noise immunity.

For this, the method of transmitting time signals and the reference frequency of the TV signal, consisting in mixing the reference frequency into the first half of the P-AND line (where is the number of the TV signal), generating high-frequency clock pulses using the reference frequency to convert the parallel time code to the serial the frequency of the high-frequency pulses, mixing the received signal at a high clock frequency into the second half of the P-th line of the television signal, simultaneously with the formation of the clock mpulsov vysszhoy frequency formed nneksL clock frequency while transforming the parallel time code in serial time code with the frequency of low frequency clock pulses, the received signal is kneaded at a low clock hour Tote second half | -and strzzhi TV svgnala, compare temporary

shifting between the received signal and the analogous signal of the primary standard of time and frequency, corrects the received signal by linearly measuring the phase of the television clock signals, moreover, the generated parashelny code is compared periodically with the similar primary time / frequency standard code and frequency and the resulting signal is corrected by the parallel time code code.

The proposed method is.

in the following.

WITH

The parallel current time code is converted into two code groups, each of which contains complete information in a serial binary or binary-decimal code about hours, minutes and seconds, with the first code group being formed by pulse width modulation of time signals, which are pulses, following with the frequency of repeating frame sync pulses and containing information on the time scale of the primary standard of time and frequency in the leading edge of time signals, and the second code group is formed independently imo from the place of formation of the television program by forming different-polarity pulses with a clock frequency much higher than the repetition frequency of frames 1X sync pulses, and transmit the above code group after the beginning of every second. the second half of the line of the frame gus Shego pulse, and first transmitting the first code group, after which the second code group is transmitted, and the hidden information alphabet is transmitted by changing the pulse output time of the first code group relative to the start time of the sync pulses, and the carrier frequency of the television transmitter is additionally stabilized relative to reference clock frequency.

The drawing shows the structure: an electronic circuit of the device for adjusting the method of transmitting time and frequency signals in a television signal.

The device contains a reference: frequency fan 1, reserve keeper. frequency 2, switch 3, driver 4 exemplary sync pulses, driver 5 time signals.

converter 6 correction signals, fs emitter 7 phase shift, electric part 8, shaper 9 consecutive code, groups, modulator 1O mixer 11 and selector 12 lines. The device works as follows.

The output voltage of the reference frequency custodian 1 and the backup frequency custodian 2 is fed through switch 3 to shaper 4, which output horizontal synchronization pulses at one output and combined frame sync frame pulses with them, and two other codes encode synchronization pulses .

: The synchronization pulses from the outputs of the former 4 are fed to the inputs. Rovatel 5, which gives time signals.

From the outputs of the imaging unit 5, the time signals arrive simultaneously on the inputs of the electronic clock 8, the imaging unit 9, the modulator 10 and the mixer 11.

Electrical clock 8 includes a parallel binary-decimal six-digit current time code, from which, after passing through shaper 9 and modulator 10, two code groups are formed, each of which contains complete information about hours, minutes, and seconds, and the first code group is formed by pulse width modulation of time signals,. and the second code group is formed independently of the place where the television program is formed by generating different-polarity pulses, after the input to the driver b, allowing the conversion, from the output, a selector of 12 lines.

Using a mixer 11, code groups are entered into the second half of the sixth row of the first half of the full damping impulse of the television; signal, and in the first half of this line, sinusoidal oscillation packets are inserted, formed on the frequencies of the reference frequency store 1 by the gating method.

Claims (1)

; To tfive the time scale of the reference frequency holder 1 to the scale of the benchmark standard in frequency In the location of the primary section of the section 5pot information about the exact time and frequency and comparing 1bg with similar information of the primary standard and in case of discrepancy I correct using correction signals, received by the communication channel through the 1Framer 6 to the world distributor 4 and the electronic clock 8, the correction signals in the shaper 4 controlling the phase shifters, and the electronic clock correcting at once across all bits with Strongly converted in the body 6 converts correction signals. For transmission from the source of the message. the alphabet of hidden information on the background of time signals in the imaging unit 7 discretely changes the delay of the time signals by means of delay lines delaying the signals for a different time, and the shift and match schemes determining the delay order. Thus, at the output of mixer 11, there is a POLAND teleconsultant signal, in the first half of the sixth lines of which the first-half frame damping pulse contains packets of the reference frequency, and the second half of the same line contains information on the exact time, as the output of the mixer 11 is connected to the television channel through which the full television signal arrives at the inputs of the radio-relay lines and the central transmitter, the information about the time and the reference frequency can be transmitted to the first place, allowing reception mother tse gralnog6 television programs, and to improve the accuracy self telyyu consumers can measure propagation scheem television signals and, since it remains for a long time constant, its uchitshat at receptions. Moreover, since the television transmitter master oscillator (not shown in Fig.) Operates in the external synchronization mode from the reference frequency band 1 hr, and the sync pulses are stabilized from the same frequency holder 1, the reference frequency information in the carrier frequency and also in sync pulses. Formula of the invention A method of transmitting signaling time and a standard frequency in a Eviziss TV (TV) gel, consisting in mixing the reference frequency to the first half L line of the TV signal (where L is the line number) of the television signal, generating high frequency clock pulses from the reference (ZH) frequency, parallel time code formation into a serial one with a frequency of high-frequency clock pulses, mixing the received signal at a clock frequency into the second half of the n-th line of the TV signal, characterized in that Increasing noise immunity, often with the formation of high frequency tits, generate low-frequency clock pulses with one-time conversion of a parallel time code to a serial time code with a frequency of low I1 clock pulses, knead the received signal at a low clock frequency into the second half of the p-line and TV signal, compare the time shift of the received signal with the same signal as the primary signal of the time and frequency standard, correct the received signal by eynogo change: no phase sync television signal, furthermore, are periodically compared sformirovanny parallel code with the corresponding time code and the primary time reference frequency and the received signal is corrected formed. parallel code. Sources of information are taken into account in the examination of l / Teeev sion Brodcast ZEEE Voe.iM-21. 1972 (prototype).