SU949700A1 - Device for start-stop magnetic recording of speech signals - Google Patents

Description

(54) DEVICE FOR START-STOP MAGNETIC RECORDING OF SPEECH SIGNALS

one

The invention relates to magnetic recording, in particular, devices for the start-stop magnetic recording of speech signals.

A device for start-stop magnetic recording of speech signals is known, comprising a comparator associated with a recording head and a start-stop mode unit connected via a control unit with a tape drive mechanism 1.

The disadvantage of this device lies in its low noise immunity.

It is also known a device comprising a recording amplifier and a recording head interconnected, a start-stop signal generating unit comprising a speech signal envelope detector connected via an amplifier connected in series, a comparator and an AND element with a tape drive control unit, the input of the start-stop signal generating unit connected to the second output of the recording amplifier 2.

The shortage of the known device consists in the impossibility of realizing the operational control of the device during operation.

The purpose of the invention is the operational control of the device for start-stop magnetic recording of speech signals.

5The goal is achieved by the fact that

A device is connected in series with a multivibrator, a diode and a controlled oscillator, the output of which is connected via a switch to the second output record player, and the multivibrator and controlled oscillator contain operational amplifiers, the output of each of which is connected to the direct and inverting inputs of the same operational amplifier inverting and direct

5 inputs which through a capacitor and a resistor, respectively, are connected to a zero potential.

The drawing shows a block diagram of a device for start-stop magnetic recording of speech signals.

Claims (2)

The device contains an input busbar 1 connected through a recording amplifier 2 with a recording head 3, a start signal generation unit 4 comprising a speech envelope detector 5, the input of which is connected to an input of a delay unit 6 and a second output of recording amplifier 2, and output through serially connected the amplifier 7 and the comparator 8 are connected to the first input of the element AND 9, the second input of which is connected to the output of the delay unit 6, and the output is connected to the input of the control unit 10 of the tape drive mechanism. In addition, it contains a series-connected multivibrator I, a diode 12 and a controlled oscillator 13, the output of which through the switch 14 is connected to the second output of the recording amplifier 2, the multivibrator 11 and the controlled oscillator 13 containing operational amplifiers 15, the output of each of which through resistors 16 connected to the direct and inverting inputs of the same operational amplifier 15, the inverting and direct inputs of which through a capacitor 17 and a resistor 18, respectively, are connected to a zero potential. The device works as follows. Recordable. Speech signals from the first output of amplifier 2 are fed to the recording head 3, and from the second output of amplifier 2, recordings are sent to the start-stop signal shaping unit 4, which forms speech signals using series-connected speech envelope detector 5, amplifier 7 and comparator 8 as well as the delay unit 6 and the AND element 9, the command to turn on the control unit 10 by the tape-driving mechanism, made it turn on when speech signals appear. Multivibrator 11 generates a pulse sequence with a frequency that coincides with the frequency range of the envelope of speech signals, and the controlled oscillator 13 generates a pulse sequence with a frequency equal to the middle of the frequency range of speech signals. Multivibrator And by means of diode 12 modulates the amplitude of the output signal of the controlled oscillator 13, which through the switch 14 enters the input of the start-stop signal shaping unit 4, which from this signal forms a command to turn on the control unit 10 by the tape mechanism. The use of the invention allows the operational control of a device for the start-stop magnetic recording of speech signals during operation. An apparatus for a start-stop magnetic recording of speech signals comprising an input bus connected via a recording amplifier to a recording head, a start-stop signal generating unit comprising a speech envelope detector, the input of which is connected to an input of a delay unit and a second output of a recording amplifier, and the output through a series-connected amplifier and comparator is connected to the first input of the element I, the second input of which is connected to the output of the delay unit and the output connected to the input of the control unit a tape mechanism, characterized in that, for the purpose of operative control of the device, a multi-vibrator, a diode and a controlled oscillator are inputted into it, the output of which through the switch is connected to the second output of the recording amplifier, the multivibrator and the controlled oscillator containing operational amplifiers, the output each of which is connected through resistors to the direct and inverting inputs of the same operational amplifier, the inverting and direct inputs of which through a capacitor and a resistor correspond are connected to zero potential. Sources of information taken into account during the examination 1. USSR author's certificate No. 546011, cl. G 11 B 15/20, 30.12.75. 2. USSR author's certificate No. 614462, cl. G 11 V 15/02, 01/17/77 (prototype).