SU1508275A1 - Method of input of data signals into digital processing device - Google Patents

Abstract

The invention relates to the field of information transfer and can be used in radio engineering, magnetic recording and other areas of technology where quality control of the input of an information signal with the use of a reference signal is required. The method provides detection and measurement of the duration of the disappearance of the reference signal, which serves to generate sampling pulses of the information signal. New is the introduction of a periodic auxiliary signal that is sampled simultaneously with the information signal. 2 Il.

Description

The invention relates to the transmission and processing of information using reference (clock) clock signals, mainly with subsequent digital processing of information, and can be used & in the communication technique, in the technique of single-instrument and multi-channel information recording, in the measurement technique, etc. ., in particular, in relation to the technology of accurate multi-channel magnetic recording and processing of measurement information.

The aim of the invention is to increase the reliability of the input information by detecting information loss, Pa Fig, 1 shows a block diagram of the device for implementing method j in Fig. 2, the time diagram of the read auxiliary signal

A device for implementing the method (FIG.) Contains a source 1 of information and reference signals, such as a tape recorder, the output of which is connected to the inputs of the first analog-digital converter (ADC) 2 and the reference signal extracting and generating unit 3 of the sampling pulses, whose input is connected to the input control the first 2 and second 4 ADCs; The input of the second ADC 4 is connected to the output of the generator 5 of the periodic auxiliary signal. Digital outputs o6oiix ADC 2 and 4 are connected to the inputs of a buffer storage device (memory) 6, the outputs of which are connected to the inputs of a digital-to-analog converter (D / A converter) l 7, One of the outputs of the digital-analog converter 7 is connected to one of the inputs 3 auxiliary signal generator

The method is implemented as follows.

cl

SP

00

uh

01

3150

The reference signal reproduced from the magnetic tape together with the information signal is extracted by block 3 (if the reference signal was recorded on a separate tape track, then the need for a reference signal extraction block 3 is no longer necessary). The selected reference signal is fed to the sampling control inputs of two A / D converters 2 and 4, the second information inputs of which receive information and auxiliary signals from the output of the generator 5, respectively. Thus, they are synchronously sampled with the frequency of the reference signal. Both signals are digitally fed into the buffer memory 6. The auxiliary signal output from memory 6 is fed to one of the inputs of the phase meter 8, the second input of which is fed from the output of the auxiliary generator 5 signal. With equal frequency of the reference signal and the frequency of outputting signals from the memory 6, the frequencies of the signals at the inputs of the phase meter 8 coincide on average. A phase meter measures the phase of the output signal, which can be recorded, for example, using a recorder (not shown). The initial value of the output signal depends on the parameters of the device and does not matter.

If during the measurement the reference signal disappears, both ADCs 2 and 4 stop working for the time of the loss and the signals in the memory 6 do not arrive. When the reference signal is resumed, information enters memory 6 again, and at the output of the D / A converter 7, a phase roll appears | which will be recorded with a phase meter. The moment of occurrence of a phase roll corresponds to the beginning of the disappearance of the reference and information signals. The duration of the disappearance determines the magnitude of the phase rejection. From this, using the results of measuring the phase, one can calculate the duration of signal loss by the formula

 ffiMx

2Tf,

where iiicfg i, is the measured phase throw value;

f - - auxiliary frequency

n ly

in signal.

If the period T of the auxiliary signal is less than the duration of the prop5

0 5 0 0

5 0 5

tribute, then there will be an error in the measurement results, equal to the whole number of missing auxiliary signal periods. Therefore, the period of the auxiliary signal should be greater than the expected maximum duration of the loss.

To eliminate the error in determining the necessary amount of the period of the auxiliary signal, the method provides for repeated sampling of signals with different, mainly repeatedly increasing, periods of the auxiliary signal. The preservation of the measured signal loss duration for two measurements indicates that the selected periods of the reference signal are longer than the fault duration, i.e. measurements made without error.

An example of determining the presence and duration of disappearances, implemented on a computer, is shown in FIG. 2, showing the results of measuring the phase of the auxiliary signal when inputting them using reference signals reproduced from two magnetic tapes (domestic tape type I-4406-6). It is obvious that on one of the records there are two losses, the magnitudes of which are insignificant. On another record there were 4 disappearances of different sizes. Note that, based on the results of measuring the full phase of the auxiliary signal, a decision is made on the possibility of further processing the information signal, and the memory area in which the auxiliary signal was recorded can be used for the next input of information.

 Thus, the method of inputting information signals to ensure the possibility of determining the moments of occurrence and measuring the duration of disappearances of information signals transmitted together with the reference signal arising in the transmission channel of these signals, while providing a condition for evaluating the correctness of information input and deciding whether to use it further ; the possibility of eliminating ambiguity in measuring the duration of disappearances; preservation of the possibility of using the reference signal for the intended purpose, for example, for

5/150

suppression of the influence of temporal distortions of the scientific research institute arising in the transmission channel of information signals.

Claims (1)

Invention Formula The method of inputting information signals into a digital processing device, including the temporary storage of incoming information signals, dis. cracked I1-5 pulses of the reference signal, characterized in that, in order to increase the reliability of the input information due to detect and determine the duration of the loss of 1-1 information, simultaneously with the information signals, remember; - monotonically varying or periodic auxiliary signals sampled by pulses of the reference signal, the period of which exceeds the expected duration of the disappearance of information signals, and then the processing unit determines the presence and magnitude of phase spikes of the auxiliary signals by which the correctness of the input of information signals is estimated , Compiled by N. Makarenko Editor M. Tsitkina Tehred M. Khodanych Corrector M. Vasilyeva Order 5545/53 Circulation 558 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 fc / FIG. 2 Subscription