SU1365122A1 - Device for receiving tape recorder control commands - Google Patents

Description

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The invention relates to instrument making, namely to devices for controlling the operating modes of a tape recorder at a distance,

The purpose of the invention is to increase noise immunity, reduce power consumption and enhance functionality by externally controlling command reception.

The drawing shows a block diagram of a tape recorder command receiving device.

The device contains a photodetector 1, an amplifier 2, a driver 3, a power supply source 4, a counter 5, an AND-NE element 6, an initial setup pulse generator 7, a decoder 8, a gate pulse driver 9, an element 10, a control switch 11 , power bus 12, controllable key 13, additional element AND-HE 14, controllable discharge circuit 15, integrating element 16, threshold element 17, level matching link 18, drive 19, light (audible indicator 20, additional logic element OR 21 and the external control bus 22.

The device works as follows.

In the initial state, the power from source A is supplied only to the amplifier 2, driver 3 and the input of the controlled switch 11. When a light pulse is received from the command in the photodetector 1, the electrical signal is transmitted, which after amplifier 2 and the driver 3 through the controlled key 13 and the logical the OR 10 element is fed to the control input of the controlled switch 11. The switch 11, which supplies the rest of the device to the bus 12, is triggered by this signal. At the same time, immediately after the supply of voltage to bus 12, the signal at the output of threshold element 17 triggers shaper 7 of the initial setup pulse, which produces a pulse whose duration is shorter than the duration of the first adjusting pulse sent by the remote control transmitter

with

f 0 5

ABOUT

five

0

five

0

five

222

setting the counter 5. Simultaneously, the signal from the direct output of the driver 9 locks the decoder 8 and through the I-NE 6 and the control key 13 gives permission for the input signal to the counting input of the counter 5, as well as through the control circuit 15 prohibits charging capacity of the integrating link 16. The signal from the inverted output of the former 9 in the AND-HE element 14 is compared with the output signal of the threshold element 17. The result of the comparison in the form of a logic level through the OR element 10 maintains the switch in the on state. Thereafter, the signals are read out by a counter. After the next pulse signal, the logical level at the output of the IS-NE 6 element is reversed, as a result of which the capacitance of the integrating circuit 16 is disabled and the control key 13 is activated, which simultaneously improves the shape of the signal pulse. The charge time of the capacitance of the integrator 16 before the triggering of the threshold element 17 is 1.5-2.0 times the duration of the intervals between the input signals. If the signal has not passed during such a time, the threshold element 17 is triggered and the level at its output is reversed. Such a level change triggers the shaper 9. The pulse duration is chosen from such a calculation that it is sufficient to control the switching of the modes in the tape recorder itself (for example, 5 ms), since this pulse controls the decoder. As a result of the input of this signal to the input of the element IS-NE 6 at its output, regardless of the signal at the other input, a logic level is present for the duration of the gating pulse, which, acting on the control key 13, prohibits the signal to the input of the counter 5. During the time of action of the strobe pulse, the logical signal at the output of the NAND 14 element does not change, which keeps the controlled switch in the on state. After the end of the strobe pulse, the control switch 11 is turned off and a new cycle of operation begins after the appearance of a new signal.

Claims (3)

1. DEVICE FOR RECEIVING MAGNETOPHONE CONTROL COMMANDS, containing a photodetector connected to a series-connected amplifier and driver, a counter, the counting input of which is connected to the output of the AND-NOT element, and a setting input - to the output of the initial setting pulse shaper, a decoder whose information inputs are connected to the outputs counter, control input - to the direct output of the gate pulse generator and to the first inputs of the AND-NOT element, a group of command signal buses is connected to the outputs of the decoder, AND element LI, the output of which is connected to the control input of a controlled voltage stabilizer, the input of which is connected to a power source, and the output to a power bus connected to the power circuits of the counter, decoder, initial pulse shapers and strobe pulses, characterized in that, in order to increase noise immunity, a controlled key, an additional AND-NOT element, and a series-connected controlled discharge circuit integrating a link and a threshold element, a link of level matching, are introduced in it, and the adjustable key is connected between the input of the driver and the second input of the NAND element, the output of which is connected to the control input of the controlled key, the first input of the additional element is connected to the inverse output of the driver of the strobe pulses, and the second input is connected to the inputs of the pulse shapers of the initial setup and strobe pulses connected to the output of the threshold element, the output of the additional element is NOT connected to the first input of the OR element, the second input of which is connected to the output of the controlled key, the input is systematic way discharge circuit connected to the output of AND-NO element, the power circuit controllable switch is connected to the power source, and the remaining input power circuit elements .soedineny with bus power. 2. The device according to p. ^ Characterized in that, in order to reduce power consumption, it is equipped with a drive that is connected between the power source and the controlled voltage regulator. SU ,,. 1365122 3. The device according to claim 1, characterized in that, in order to expand the functionality by external control of command reception, an additional OR element is introduced into it, the first input of which is connected to the output of the AND-NOT element, and the second input is connected to the external control bus , the output of the additional OR element is connected to the control input of the managed key.