SU560316A1

SU560316A1 - Device for discrete gain control

Info

Publication number: SU560316A1
Application number: SU2179815A
Authority: SU
Inventors: Михаил Соломонович Хвиливицкий
Original assignee: Предприятие П/Я А-3150
Priority date: 1975-10-03
Filing date: 1975-10-03
Publication date: 1977-05-30

Description

1one

Изобретение относитс к радиовещанию.The invention relates to broadcasting.

Известно устройство дл дискретной регулировки усилени , в котором используетс цифровой аттенюатор, представл ющий собой ступенчатую схему на резисторах, затухание которой зависит от кода, поступающего на управл ющие входы аттенюатора. Кодовые сигналы подаютс на электронные ключи , каждый из которых вводит определенную ступень аттенюатора. В зависимости от того, какие ступени включены, измен етс и общее затухание аттенюатора. Аттенюатор управл етс реверсивным счетчиком, который имеет столько же каскадов, сколько ступеней у аттенюатора . Счетчик -переводитс в режим работы «Сложение или «Вычитание в зависимости от Сигналов, подаваемых на его управл ющий вход. Эти сигналы перевод т аттенюатор в режим введени или выведени затухани . На основной вход реверсивного счетчика подаютс импульсы, вырабатываемые автоколебательным мультивибратором.A device for discrete gain control is known in which a digital attenuator is used, which is a stepped circuit on resistors, the attenuation of which depends on the code fed to the control inputs of the attenuator. The code signals are applied to electronic keys, each of which introduces a specific attenuator level. Depending on which stages are included, the total attenuation of the attenuator varies. The attenuator is controlled by a reversible counter, which has as many stages as the steps of the attenuator. The counter is switched to the "Addition or Subtraction" mode depending on the Signals fed to its control input. These signals place the attenuator in fade-in or fade-out mode. The main input of the reversible counter is supplied with pulses produced by a self-oscillating multivibrator.

Однако в известном устройстве сложно измен ть пределы регулировани .However, in the known device it is difficult to change the control limits.

Иаиболее близким техническим решением к данному изобретению вл етс устройство дл дискретной регулировки усилени , содержащее дискретный аттенюатор, к входам управлени которого подключен реверсивный счетчик, к счетному входу которого подключенAnd the closest technical solution to this invention is a device for discrete gain control, containing a discrete attenuator, to the control inputs of which a reversible counter is connected, to whose counting input is connected

управл емый генератор импульсов, а к управл ющим входам - выходы триггера реверса.controlled pulse generator, and to the control inputs - the outputs of the reverse trigger.

В таком устройстве требуетс значительное вре.м дл перестройки пределов изменени усилени .Such a device requires considerable time to re-adjust the limits of variation of the gain.

Цель изобретени - сокращение времени перестройки пределов изменени усилени .The purpose of the invention is to reduce the time for restructuring the limits of change in gain.

Дл этого в устройство дл дискретной регулировки усилени , содержащее дискретный аттенюатор, к входам управлени которого подключен реверсивный счетчик, к счетному входу которого подключен управл емый генератор импульсов, а к управл ющим входам -For this, a discrete gain control device containing a discrete attenuator, to the control inputs of which a reversible counter is connected, to the counting input of which a controlled pulse generator is connected, and to the control inputs -

выходы триггера реверса, введены две цепи обратной св зи между выходами реверсивного счетчика и соответствующими плечами триггера реверса, кажда из которых содержит последовательно соединенные многоканальный управл емый блок равнозначности, первый элемент И и второй элемент И, другой вход которого соединен с выходом противоположного .плеча триггера реверса, при этом к выходам вторых элементов И обеих цепейreverse trigger outputs, two feedback circuits are inserted between the outputs of the reversible counter and the corresponding shoulders of the reverse trigger, each of which contains a series-connected multi-channel controlled equivalence block, the first And element, and the second And element, the other input of which is connected to the output of the opposite shoulder of the trigger reverse, with the outputs of the second elements And both circuits

Claims

feedback element is connected OR, the output of which and the control input of the pulse generator included controlled trigger trigger. The drawing shows a structural electrical circuit of the proposed device. The device contains a discrete attenuator 1, to the inputs of which the reversible counter 2 is connected, to the counting input of which is connected an equalized generator of 3 pulses, and to the control inputs - the outputs of trigger 4 of the reverse; and two feedback values, each of which consists of a series-connected multi-channel controlled equivalence unit 5, the first element li 6 and the second element 7. And the feedback value are connected between the outputs of the reversing counter 2 and the corresponding arms of the reverse trigger 4. Others the inputs of the second elements And 7 of both prices are connected to the outputs of the opposite arm of the trigger 4 reverses, and the outputs of the second elements And 7 of both circuits are connected to the element P1LI 8, between the output of which and the input of the control of the generator 3 impulses unplugged controllable trigger 9 run. The device works as follows. By pressing the corresponding buttons of the multichannel controlled block of equivalence, the operator dials the lower and upper limits of the operation of the automatic discrete gain control device. If 2 dB and 4 dB are pressed in one row, and 8 dB and 16 dB in the other, the device changes the attenuation from 6 to 24 dB. Assume that in the initial state, the damping is not introduced. After clicking the Start button, the launch trigger 9 is set to one. The signal from its output permits the passage of emulsions produced by a controlled generator of 3 pulses to the input of the reversible counter 2. Reversible counter 2 operating in. “Addition mode starts counting pulses. The code at its output changes. When the code at the output of the reversible counter 2 coincides with the code dialed on the keyboard of the buttons of the multi-channel controlled block of equivalence 5 of the upper adjustment limit, the signal at the output of the first element And 6 becomes equal to "1. This signal will reset trigger 4 reversals and, via OR 8, trigger trigger 9, while the pulses from the controlled generator 3 pulses to the reversing counter 2 are stopped, it is switched to the Subtract mode, and the signaling circuit 10 indicates the attenuation signal entered. The next time you press the start button, the start trigger 9 is set to one again, and the impulses begin to arrive at the input of the reversible counter.

2. Since this counter now operates in the JHMC subtraction, it starts counting back and counts until the code at its output matches the code set using the button keyboard of the multichannel controllable block 5 of the equivalence of the lower limit of adjustment. After the codes coincide with the output of the first element I 6, a signal is generated, which interprets the flip-flop of the reverse 4 to one state and flushes (via the OR element 8) flip-flop 9 to the zero state. The pulsing of the pulses to the counter 2 is stopped and the light signaling is turned off (the attenuation signal is output). Since the attenuation introduced into the main audio path is determined by the code taken from the output of the reversible counter 2, which is fed to the control input of discrete attenuator 1, during the forward counting, the attenuation increases, and during the count, Pazad decreases. The attenuation rate is determined by the pulse frequency of the controlled pulse generator.

3. If the attenuation steps are chosen small, for example, 1 dB, then the automatic discrete gain control device will introduce attenuation, changing in small, inconspicuous steps (creating the illusion of a smooth change in volume). Thus, the proposed device for discrete gain control allows the selection and alteration of the upper and lower attenuation limits to be quickly performed. Apparatus of the Invention A device for discrete gain control, comprising a discrete attenuator, to the inputs of which a reversible counter is connected, to the counting input of which a controlled pulse generator is connected, and to the control inputs - reverse trigger outputs, which in order to shorten the tuning time the limits of the gain change, two feedback circuits are inserted between the outputs of the reversible counter and the corresponding shoulders of the reverse trigger, each of which contains About the connected multi-channel controlled block of equivalence, the first element is And the second element is And, the other input of which is connected to the output of the opposite arm of the reverse trigger, while the element OR is connected to the outputs of the second And elements of both feedback circuits and between the output of the generator control pulses enabled controlled trigger trigger.

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