SU539316A1 - Device for reproducing phase modulated signals - Google Patents

Description

one

The invention relates to the field of instrumentation.

A device for reproducing phase-modulated signals is known when a double-sided limiter is used to form square impulses, installed after the amplifier, the output of which is connected to shaper 1. But due to the fact that the formation of output pulses requires that previous pulses Already, this scheme is significantly more complex. By applying several subdivisions of positioned magnetic heads to narrow pulses, it is possible to simplify the electric circuit 2, but at the same time complicate the block of heads, moreover, due to an increase in the amount of the area in contact with the magnetic carrier, the uniformity of its movement decreases.

It is also known a device for reproducing phase-modulated signals, comprising an input terminal, output rails, an amplifier, a limiter, a driver and a synchronizer connected to a control unit, which is a start-up unit 3.

However, when operating such a device, the probability of occurrence in the pauses between code groups of spurious pulses remains high enough, which reduces the reliability of the reproduced information.

To reduce the probability of occurrence in the pauses between code groups of spurious pulses, the proposed device is equipped with serially connected blocks for indicating the presence and absence of signals connected between the input of the limiter connected through an amplifier to the input terminal and the output of the synchronizer connected to the output of the limiter through the driver with

In this way, the input of the control unit is connected to the connection point of the signal indicating unit and the limiter unit, and the output of the imaging unit is connected with the second input of the last of the indicated units.

The drawing shows a block diagram of the described device.

The amplifier 1 through the limiter 2 and the driver 3 is connected to the synchronizer 4. The driver output is also connected via block 5

Claims (3)

indications of signals with a block; indications of absence of signals. The output of block 5 is connected to the second input of limiter 2 and to the input of control unit 7. After amplification, limitation and the formation of a signal, the signal goes to the synchronizer and to block 5. This block allows the control unit to operate and the synchronizer starts up, and the limiting level switches from below limiter. The synchronizer extracts from the sequence of pulses the code and synchronizing signals and, at the end of the codeose group, the signal; block 5); sends the signal to block 5. Afterwards, the m.i input notional changes, in the direction of increasing the limitation level, and then the control unit receives a signal to terminate the synchronizer operation until the next code group is sent. Thus, when a signal is detected, the level of restriction decreases, which leads to a decrease in the number of dropsouts, and in the pauses between code groups, the level of restriction increases, which reduces the likelihood of the device to respond to a false signal. Apparatus of the Invention A device for reconstructing a phase-modulated vanilla signal comprising an input terminal and output busses, an amplifier, a limiter, a driver and a synchronizer connected to the control unit, in order to reduce the probability of arising in pauses between code groups of false pulses, it is equipped with successively connected blocks of indication of the presence and absence of signals connected between the input of the limiter connected through an amplifier to the input terminal and the output of the synchronizer Coupled to the output through the restrictor driver, and the communication control unit input coupled to the junction point unit signals indicating the presence and the limiter and the output of the - last to a second input of said blocks. Sources of information taken into account in the examination. 1.Patent of Japan Ho 8654, cl. 98FO, 1966. 2. Patent Yaionin number 25932, cl. 102E32, 1963. 3. Japan patent number 18245, cl. 102EZZZ, 1973 (prototype).