RU32949U1 - Device for measuring the busy time of the radio channel - Google Patents

Description

DEVICE FOR MEASURING EMPLOYMENT TIME

The utility model relates to radio engineering, and more specifically to devices for measuring the busy time of a radio channel in a radio network with multiple random access.

A sound decoder is known that contains a microphone, an active filter, a counter and a load switching device connected in series, as well as an ADC, four memory devices, two comparators, two timers, a pulse generator, an address indicator and a mode switch, which is designed for sequential sequential control of up to four independent loads while providing noise immunity to false sound signals.

The disadvantage of this device is the impossibility of simultaneously controlling independent loads and the inability to measure the time of action of the schial at the input of the decoder.

A multi-frequency signal receiver is also known, comprising an amplifier with AGC 1, narrow-band pass filters 2, 3, 4, 5, 6 and 7, detectors 8.9, 10, II, 12 and 13, the 1st and 2nd depragrator 14 and 35, channel selectors for durations 15, 16 and 17, elements 18, 19, 20 and 21, parallel register 22, disambiguation element 23, 1st and 2nd switches 24 and 30, one-shot 25, random access memory 26, shaper 27, generator 28, buffer register 29, trigger 31, majority processing unit 32, display unit 33, addressing unit 43, inductive call receiver 36, matching unit 37, generator from ETA 38, the timer 39 and the phone 40.

MnK: H04Ql / 36

RADIO CHANNELS

The disadvantage of this device is the impossibility of simultaneously fixing several signals with determining the duration of each of them and the total time of occupation of the radio channel.

This technical solution is selected as a nrototype. The purpose of the utility model is to increase the accuracy of measuring the busy time of a radio channel.

This goal is achieved by the fact that in the known device containing the amplifier, to the output of which 4 narrow-bandpass filters are connected, to the outputs of which, in turn, 4 detectors are connected, the fifth detector and the generator additionally have a receiver tuned to the carrier frequency of the radio channel to the output which amplifier is connected; a low-pass filter connected to the output of the amplifier, to the output of which, in turn, is connected a fifth detector, a first electronic key, the first input of which is connected to the output of the first detector, and the second input to the output of the generator; a second electronic key, the first input of which is connected to the output of the second detector, and the second input to the output of the generator; a third electronic key, the first input of which is connected to the output of the third detector, and the second input to the output of the generator; a fourth electronic key, the first input of which is connected to the output of the fourth detector, and the second input to the output of the generator; a fifth electronic key, the first input of which is connected to the output of the fifth detector, and the second input to the output of the generator; 5 counters, the inputs of which are connected to the outputs of the corresponding electronic keys.

In a radio channel with multiple random access on a single carrier frequency, a large number of radio stations operate. Only one radio station is transmitting at a time, and the rest is receiving. Radio stations are divided into groups, each of which is assigned its own calling frequency of the tone signal: 700 Hz, 1000 Hz, 1400 Hz and 2100 Hz. To effectively use the radio channel and reduce the latency for transmitting, you must limit the number

radios operating on the same carrier frequency. Measuring the busy time of the radio channel allows you to optimize the number of radio stations.

Improving the accuracy of measuring the busy time of the radio channel is achieved by the fact that the generator generates second pulses, and the busy time is determined separately for ringing tonal frequencies emitted by narrow-band bandpass filters, and speech signals emitted by a low-pass filter.

A diagram of the proposed device for measuring the busy time of the radio channel is presented in FIG. 1.

The proposed device comprises a receiver 1, to the output of which an amplifier 2 is connected, to the output of which, in turn, narrow-band bandpass filters 3, 4, 5 and 6 and a low-pass filter 7 are connected, to the outputs of which detectors 8.9, 10, 11 and 12, the first inputs of the corresponding electronic keys 13, 14, 15, 16 and 17, the second pulse generator 18, to the output of which the second inputs of the electronic keys, counters 19, 20, 21, 22 and 23, the inputs of which are connected to the outputs of the corresponding electronic keys.

The proposed device operates as follows. The receiver 1 constantly receives a signal on the carrier frequency of the radio channel. Amplifier 2 amplifies the output signal of the receiver to the value necessary for the normal operation of the narrow-band bandpass filters 3, 4, 5 and 6 of the low-pass filter 7. The band-pass filter 3 selects a frequency of 700 Hz, the band-pass filter 4 - 1000 Hz, the band-pass filter 5 - 1400 Hz and bandpass filter 6 2100 Hz. The cutoff frequency of the low-pass filter is 2700 Hz, it emits speech signals and all signals of ringing tonal frequencies. Detectors 8, 9, 10, II, and 12 convert AC signals into DC pulses, the duration of which is equal to the transmission time of a tone signal or the time of a voice message. The electronic keys 13, 14, 15, 16 and 17 otfitsya for the duration of the duration of the DC pulses, and

allow the transfer of second pulses from the generator 18 to the counter. Counter 19 determines the busy time of the radio channel with a tone signal of 700 Hz, a counter of 20 - 1000 Hz, a counter of 21-1400 Hz, a counter of 22-2100 Hz and a counter 23 — the total transmission time of tonal and speech signals.

The proposed device can be used to measure the occupancy of the radio channel in the systems of technological, repair and station radio communications in railway transport and allows you to determine which group of radio stations loads the radio channel to the greatest extent.

Applicant:

Chief engineer of the Kuibyshev railway;

V.P. Mokhonko

Claims (1)

A device for measuring the busy time of a radio channel containing an amplifier, the output of which is connected to the first, second, third and fourth narrow-band bandpass filters, the outputs of which, in turn, are connected to the first, second, third and fourth detectors, the fifth detector and generator, characterized in that it additionally includes a receiver tuned to the carrier frequency of the radio channel, to the output of which an amplifier is connected, a low-pass filter connected to the output of the amplifier, to the output of the low-pass filter, in turn, the fifth detector is switched on, the first electronic key, the first input of which is connected to the output of the first detector, and the second input to the output of the generator, the second electronic key, the first input of which is connected to the output of the second detector, and the second input to the output of the generator, the third electronic key, the first input of which is connected to the output of the third detector, and the second input - to the output of the generator, the fourth electronic key, the first input of which is connected to the output of the fourth detector, and the second input - to the output of the fifth detector, the fifth electronic key One of which is connected to the output of the fifth detector, and the second input to the output of the generator, the first, second, third, fourth and fifth counters, the inputs of which are connected to the outputs of the corresponding electronic keys, and the generator generates second pulses.