SU1297237A1 - Meter of level of non-stationary electric signals - Google Patents

Abstract

The invention relates to telecommunications. The purpose of the invention is to increase the measurement accuracy. The device contains an input matching unit 1, 2 audio frequencies, a detector 3, an integrator 4, a logarithmic. a functional converter 5, i channels, each of which contains a comparator 6, a key 12 and an LED 13, forming an indicator 14, a voltage source 11. The sensor of the 7 time intervals connected in series is newly introduced, r.-8 clock pulses, (i-2) el-OR 9 and in each of the i channels an el-10 memory has been inserted. 1 il. . u; co 1 IsD ICO vj

Description

The invention relates to telecommunications and can be used in monitoring systems for broadcasting, wire broadcasting, television and sound amplification equipment.

The purpose of the invention is to increase the measurement accuracy.

The drawing shows a structural electrical circuit for measuring the level of non-stationary electrical signals.

The non-stationary electric signal level meter contains an input matching unit 1, an audio amplifier 2, a detector 3, an integrator 4, a log-function functional converter 5, i channels, each of which contains comparators 6, a sensor 7 time intervals, a generator of 8 clock pulses, elements OR 9 , memory elements 10, voltage source 11, keys 12 and LEDs 13, forming indicator 14,

The device works as follows.

Measure electric signal. through the input matching unit 1 enters the amplifier 2 audio frequencies, amplifies them to the desired value, is detected by the full-wave detector 3, averaged by the integrator 4, which determines the main dynamic parameters of the device (integration time and return time), is logarithmized using functional transducer 5, which determines the amplitude response of the device and. his graduation. Then, the measured signal is fed to i parallel channels, with the help of which the% of the current signal level is produced.

When the input signal of the device decreases, at which, for example, the (i - 1) th comparator is triggered, the keys of the t2 i - 1 channels open and the voltage from the voltage source 11 goes to the corresponding LEDs 13, which begin to shine. The signal from the i-ro output of the key goes to the OR 9 elements from the first through (i-1) -th channel, from the output of which the signal goes to the first control input of the element and is displayed. The beginning of measurements of the maximum level of 10 memory from the first to the (i - 1) -th stationary electric signal channel and holds the elements of memory 10

for a certain time interval, it is determined by a signal from the sensor output of 7 time intervals to the inputs of the memory elements 10, which set them to their initial state, as well as to the input of the generator 8 clock pulses. As long as there is no measured signal at the device input, all the comparators 6 and the memory elements 10 are in the initial state, in which all the keys 12 are closed and none of the LEDs 13 is illuminated.

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When a signal appears at the input of the device, at which i input comparators operate, the keys 12 of the i channel open and the voltage from the voltage source 11 is supplied to the corresponding LEDs 13, which begin to shine.

The signal from i - 2 outputs of keys 12 (except for the first and i-ro channels) goes to elements OR 9, from the output of which the signal goes to the fourth control input of memory element 10 from the first channel to (i - 1) -y and holds the elements 10 memories in the initial state. At the same time, the signal from the output i of the comparators 6 is fed to the first (informational) inputs of the memory elements 10, and when a clock pulse arrives from the clock generator 8, the i-ro memory element 10 of the memory switches to the one state, since all other elements 10 are held in the initial state of the signals from the outputs of the elements OR 9. The signal from the output of the i-ro element 10 of the memory opens the key of the i-ro channel and at the same time the potential from the output of the voltage source 11 is applied to the corresponding LED 13, which continues to shine, the signal Isiru about the maximum signal level at the current time.

When the input signal of the device decreases, at which, for example, the (i - 1) th comparator is triggered, the keys of the t2 i - 1 channels open and the voltage from the voltage source 11 goes to the corresponding LEDs 13, which begin to shine. The signal from the i-ro output of the key goes to the OR 9 elements from the first through (i - 1) -th channel, from the output of which the signal goes to the first control input eleo0

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45 cop 10 memory from the first to (i - 1) -th channel and holds the elements of 10 memory

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in the initial state.

At the same time, the level of the current signal is indicated by a light indicator (bar) and the maximum level is fixed for a measured period of time, i.e. LED 13 channel is lit ,,

When the signal at the input 55 of the device increases to a value, with a kbtor, for example, (i + 1) -th comparator 6 is triggered, the signal from the i - 1 outputs of the keys 12, except for the first and (i + 1) - th, goes to the OR 9 elements , the signal from the output of which holds the memory elements 10 from the first to (1-1) -th in the initial state. At the same time, the signal from the i + 1 output of the Comparators 6 is fed to the information inputs of the memory elements 10, and when a pulse arrives from the clock generator 8, the (i + 1) -th memory element 10 of the memory 10 is switched to a single state, since the memory elements 10 From the first to the (i - 1) -th channel, they are held in the initial state by signals from the outputs of the OR 9 elements, and the memory element 10 of the i-channel is reset to the initial state by a signal from the output of the OR element 9 of the i-ro channel.

The signal from the output of the (i + 1) th memory element 10 opens the key of the 12th (i + 1) th channel, and the voltage from can be chosen for practical reasons, for example, 3 min or any other value,

Claims (1)

5 claims A non-stationary electrical signal level meter containing a series-connected input matching unit, an audio frequency amplifier, a detector, an integrator, and a logarithmic function converter, i channels, each of which consists of series-connected comparators, a key and an LED, a voltage source, the output of which is connected En to the second input of each key, characterized in that, in order to improve accuracy, The voltage point 11 is supplied to co-20 rhenium, the series-connected LED 13 is inserted in series, which remains on, indicating the maximum signal level at the current time. 25 The time sensor, the clock pulse generator, (i-2) elements of the lump and each of the i channels have a memory element inserted between the comparator output and the third key input, while the output of the time sensor and the clock generator output are connected to the second and third inputs of each memory element, the inputs of each of the (i-2) elements of the NL are connected to the outputs of each of the (i-1) keys of the subsequent channels, and the output is connected to the fourth input of the element Upon completion of the received measurement time interval, the sensor of 7 time intervals turns off the generator of 8 clock pulses. In this case, the clock pulses are not fed to the inputs of the memory elements 10 and the memory elements 10 retain their state, and the luminous LED 13 of the indicator 14 fixes the maximum value of the signal level for the measured period of time that the memory of the corresponding channel is 35. Editor N.Shvyschka Order 796/61 Circulation 639 Subscription VNIIPI USSR State Committee for inventions and discoveries, 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 may be chosen from practical considerations equal, for example, 3 minutes or any other value, Invention Formula A non-stationary electrical signal level meter containing a series-connected input matching unit, an audio frequency amplifier, a detector, an integrator, and a logarithmic function converter, i channels, each of which consists of series-connected comparators, a key and an LED, a voltage source, the output of which is connected En to the second input of each key, characterized in that, in order to measure accuracy rhenium, introduced sequentially The time sensor, the clock pulse generator, (i-2) elements of the lump and each of the i channels have a memory element inserted between the comparator output and the third key input, while the output of the time sensor and the clock generator output are connected to the second and third inputs of each memory element, the inputs of each of the (i-2) elements of the NL are connected to the outputs of each of the (i-1) keys of the subsequent channels, and the output is connected to the fourth input of the element Compiled by A. Seselkin Tehred A. Kravchuk Proofreader T. Kolb