SU809327A1 - Magnetic recording and reproducing apparatus - Google Patents

Description

(54) DEVICE FOR MAGNET RECORDING AND REPRODUCTION

I

This invention relates to magnetic recording, in particular, magnetic recording and reproducing devices.

A device for magnetic recording and playback is known comprising an input bus connected to the base of the first transistor connected by a collector to the base of the second transistor whose collector is connected via a capacitor to the output bus.

The known device has a relatively simple design, but does not provide noise reduction.

It is also known that a magnetic recording and playback device contains an input bus connected to the base of the first transistor connected by a collector directly to the base of the second transistor whose collector is connected through the first capacitor to the output bus and to the moving contact of the switch whose first stationary pin is connected through the first resistor and connected in parallel the second resistor and the second capacitor with the emitter of the first transistor connected through the third resistor to the common bus, and the black Fourth resistor and three connected in parallel

capacitor through a fifth resistor with a second fixed contact switch, and a noise suppressor. made with output key 2. This device allows for a relatively high degree of noise reduction.

The disadvantage of this device is the considerable complexity of its design.

The purpose of the invention is to simplify the design of the device.

This goal is achieved due to the fact that the output key of the squelch switch is connected between the second fixed contact of the switch and the common bus.

The drawing shows a diagram of a device for magnetic recording and playback.

The device contains an input bus 1 connected to the base of the first transistor 2 connected by a collector to the base of the second transistor 3. The collector of the second transistor is connected through the first capacitor 4 to the output bus 5 and to the moving contact of switch 6. The first fixed contact of switch 6 is connected through the first resistor 7 and

connected in parallel the second resistor 8 and the second capacitor 9 with the emitter of the first transistor 2. The emitter of the first transistor 2 is connected through the third resistor 10 to the common bus 11, and through the fourth resistor 12 connected in parallel and the third capacitor 13 and through the fifth resistor 14 to the second fixed contact switch b.

The proposed device also contains a squelch 15, made with an output key 16 connected between the second fixed contact of the switch 6 and the common bus 11.

In the process of magnetic recording, the moving contact of the switch b is closed to its first fixed contact, and during playback to the second fixed contact. In the process of reproducing, when the -signal on input wider 1 is below the threshold level, the squelch 15 ensures that its output key 16 closes the output bus 5 to the common bus. If during playback, the signal on the input bus i exceeds the threshold level, then you have to open its output key 16, which ensures that the output bus 5 is disconnected from the common bus 11.

The use of the proposed device allows to significantly simplify the design of the device for magnetic recording and reproduction.

Claims (2)

1. Korolkov V.G. and others. Electrical circuits tape. M., Energie, 1967, p. 114-116. 2. Japanese patent number 51-1408, 5 cells. 102 E 311, 1976 (prototype).