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Device for measuring frequency variation in audio frequency channel
SU1427582A1
USSR - Soviet Union
- Other languages
Russian - Inventor
Анатолий Григорьевич Чумаченко Виктор Иванович Зеленин Валерий Федорович Гудилин Владимир Федорович Савилов
Description
translated from Russian
Изобретение относитс к электросв зи и может быть использовано дл измерени изменени частоты сигнала в канале тональной частоты. сThe invention relates to telecommunications and can be used to measure changes in the frequency of a signal in a tone frequency channel. with
Цель изобретени - повышение точ- ;ности измерени при одновременном упрощении устройства за счет сокращени общего числа блоков.The purpose of the invention is to increase the measurement accuracy while simplifying the device by reducing the total number of blocks.
На чертеже представлена структур- Q нал электрическа схема предлагаемого устройства.The drawing shows the structure - Q Nal electrical circuit of the proposed device.
Устройство дл измерени изменени частоты сигнала в канале тональной частоты содержит канал 1 тональной t5An apparatus for measuring a change in the frequency of a signal in a tone frequency channel comprises a channel 1 of a t5 tone
частоты, задающий генератор 2, амплитудный ограничитель 3, блок 4 согласовани , квадратичный детектор 5, фильтр 6 и частотомер 7.frequency, the oscillator 2, the amplitude limiter 3, the matching unit 4, the quadratic detector 5, the filter 6 and the frequency meter 7.
Устройство работает следующим образом .The device works as follows.
Задак ций генератор 2 вырабатывает сигнал (например, частоты 1000 Гц), из которого с помощью амплитудного ограничител 3 формируютс две измерительные частоты (например, 1000 и 3000 Гц), которые с выхода амплитудного ограничител 3 поступают в канал 1 тональной частоты. Суммарное значение амплитуд измерительных частот (огибающа ), поступающих в канал 1 тональной частоты, во времены не измен етс .The generator 2 generates a signal (for example, a frequency of 1000 Hz) from which two measuring frequencies (for example, 1000 and 3000 Hz) are generated using amplitude limiter 3, which from the output of amplitude limiter 3 are fed into channel 1 of the tone frequency. The total value of the amplitudes of the measurement frequencies (envelope) entering the channel 1 of the tone frequency does not change over time.
Приход щие из канала 1 тональной частоты сигналы измерительных частот ) меют отклонение частоты, например от О до 2 Гц. Они поступают на блок Coming frequency signals coming from channel 1 of the tonal frequency have a frequency deviation, for example, from 0 to 2 Hz. They arrive at the block
4, а потом усиленные - на вход квадратичного детектора 5, в котором происходит выделение огибающей амплитуд измерительных частот. Огибающа амплитуд измерительных частот во времени не измен етс . Частота изменени огибающей равна удвоенному отклонению частоты.4, and then amplified - to the input of a quadratic detector 5, in which the envelope of the amplitudes of the measuring frequencies is selected. The envelope of the measurement frequency amplitudes does not change with time. The frequency of change of the envelope is equal to twice the frequency deviation.
Затем вьщеленна квадратичньш де- тектром 5 частота огибающей поступает на вход фильтра 6, в котором происходит подавление сигналов измерительных частот и их гармонических соста- вл ющ1 х, с выхода фильтра 6 частота огибающей регистрируетс частотомером 7.Then, the square of the detector 5, the frequency of the envelope, is fed to the input of the filter 6, in which the suppression of the measuring frequency signals and their harmonic components occurs, and from the output of the filter 6, the frequency of the envelope is recorded by the frequency meter 7.