SU1363497A2 - Apparatus for automatic measuring of frequency characteristics of communication channels - Google Patents

Abstract

The invention is further to the invention in a. No. 924876 and provides increased reliability. The device contains a program-1 amm block (PB) 1, generators 2, 3, switches 4, 5, reversing register (PP) 6, display block 7, control block 8, mixers 9, 12, selective amplifiers 10, 13, converters 11, 14 analog-code and block 15 matches. Information about the required oscillator frequency 2, 3 is fed to oscillators 2, 3. When calibrating, the mixer 9 receives the signal of generator 2 directly and the signal of generator 3 through the switch 5. Mixer 9 selects the difference frequency, which through the selective amplifier 10, converter 11 is analog code and switch 4 is written to the subtraction input of PP 6 and compared via PB with a sample of block 8. If the deviation does not exceed the allowable one, generator 3 is connected to the input of the measured channel, the output of the measured channel is to the mixer 9, and output One analog-code converter 11 to the input of the addition of the RR 6. The measurement result is found from the RR 6 through PB 1 to block 7. To eliminate errors in the channel quality estimation, arising due to a significant difference in the frequencies of the oscillators 2, 3, blocks 12 - 15 are introduced The presence of signals at the inputs of block 15 is an indication of the consistency of the frequencies of the control oscillators 2, 3. SL from 05 00 to 1H

Description

The invention relates to radio engineering and can be used in complexes of automated quality control of communication channels.

The purpose of the invention is to increase credibility.

The drawing shows a structural electrical circuit of the proposed device.

The device for automatically measuring the frequency characteristics of the communication channels comprises a software unit 1, the first 2 and second 3 generators, the first 4 and second 5 switches, the reversing register 6, the display unit 7, the control unit 8, the first mixer 9, the first selective amplifier 10, the first analog-to-code converter 11, second mixer 12, second selective amplifier 13, second analog-code converter 14, block 15 coincidence.

The device works as follows.

By commencing the measurement command, information about the required oscillator frequency 2 and 3 is read from display unit 7 and through software block 1 is sent to oscillators 2 and 3. At the same time, this command is sent to a similar device in executive mode at the other end of the communication channel.

The software unit 1 commands to the second switch 5 to connect the second generator 3 to the second input of the first mixer 9, to the first switch 4 to connect the output

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software block 1 with the sample present in block 8. If the deviation does not exceed the allowable, the device is recognized as intact and the measurement continues. The software unit 1 issues a command to the second switch 5 to connect the output of the second generator 3 to the input of the measured channel and the output of the measured channel to the input of the first mixer 9, to the first switch 4 to connect the output of the first analog-code converter 22 to the addition input of the reversing register 6 and to the device at the opposite end of the communication channel to perform similar switching.

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The measurement result is read from the reversing register 6 through the software unit 1 to the display unit 7. The measurement at the following frequencies of the desired diazon is similar.

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In the case where the frequencies of the calibration oscillators 2 and 3 at different ends of the communication channel are significantly different, erroneous estimates of the channel quality are possible. To eliminate these errors, the signals from the second generator 3 and the channel output go to the second mixer 35 12. If the frequencies differ slightly, then. the signal passes through the second selective amplifier 13 to the second input of the second analog-code converter 14. From the output of the second-first converter analog-code 11 to the ryl analog-code converter 14 to the addition or subtraction input, the signal 1 is fed to the first input of the version 6 register Block 15, at the second entrance

Next, a calibration block-15 operation is performed. A match is also present.

povki. The signal from the output of the second generator 3 is fed through the second switch 5 to the first mixer 9, the second input of which from the first generator 2 receives a signal with a frequency below (or above) the frequency of the second generator 3 (for example, at 30 kHz). From the output of the first mixer 9, the difference frequency (e.g., 30 kHz) is fed to the first selective amplifier 10 and the first analog-code converter 11, from the output of which the sequence of pulses through the first switch 4 is written to the subtraction input of the reverse register 6 and compared through

software block 1 with the sample present in block 8. If the deviation does not exceed the allowable, the device is recognized as intact and the measurement continues. The software unit 1 issues a command to the second switch 5 to connect the output of the second generator 3 to the input of the measured channel and the output of the measured channel to the input of the first mixer 9, to the first switch 4 to connect the output of the first analog-code converter 22 to the addition input of the reversing register 6 and to the device at the opposite end of the communication channel to perform similar switching.

The measurement result is read from the reversing register 6 through the software unit 1 to the display unit 7. The measurement at the following frequencies of the desired diazon is similar.

In the case when the frequencies of calibration generators 2 and 3 at different ends of the communication channel are significantly different, erroneous estimates of the quality of the channel are possible. To eliminate these errors, the signals from the second generator 3 and the channel output go to the second mixer 12. If the frequencies differ slightly, then. the signal passes through the second selective amplifier 13 to the second input of the second converter analog-code 14. From the output of the second converter analog-code 14, signal 1 is fed to the first input of the coincidence unit 15, at the second input

The signal 1, the one that controls the second switch 5. If there are coincidences of these signals at the inputs of block 15, the signal from its output goes to block 7, where it indicates a consistency of the frequencies of the control oscillators. In the case of differences in frequency of the first and second generators more than the permissible signal, the second amplifier 13 does not pass through, respectively, the output of the second converter 14 en shock code and the matching unit 15 contains the signal O, which is perceived in block 7 as a symptom of one of the terminals.

313634974

Claims (1)

Claims of the invention which are connected respectively with the outputs of the second generator and the second Automatic switch device, second selective measure the frequency characteristics of the amplifier, the second transducer bond fee by auth. No. 924876, analog code and match block, second characterized in that the input and output of which are connected according to the purpose of increasing the reliability, in an introductory way with the second output, the programmed sequentially connected second-to-many units and an additional input swarm mixer, first and second inputs of the display i-block.