SU372721A1 - ALL-UNION - Google Patents

Description

one

The invention relates to automation and communication.

Devices are known for discriminating telegraph codes by the parity polarity ratio, comprising a generator to which a frequency changing unit is connected, a polarity counting unit included in the package and a memory unit whose output is connected via a code period determining unit and a drive to the comparator included in output of the device, as well as a block of permanent memory, connected via a buffer stage to the comparator.

In order to accelerate the recognition of a code by its probabilistic characteristics, fixed in a fixed memory unit, a block for determining signal and stop parcels, connected by inputs to a device input and a generator, and outputs by a frequency changing unit, to a field counting unit, is entered into the device. parcels, to the block of permanent memory and to the block of determining the period of the code.

The imp is a functional block diagram of the device.

In the initial state, the memory block /, block

2 Parcel polarity counting and storage

3 is in the state "O, and in the block of permanent memory 4 the probability characteristics of the telegraph codes are recorded. With

In this case, the frequency measurement unit 5 does not emit pulses of the error signals to the generator 6, which is in the operating state.

Information coming from equipment not shown in the drawing to the input of the block from memory 1 is recorded in binary code and simultaneously enters block 7 of determining the signal and stop parcels, if the latter are in the transmission, and block 2 of the parcel polarity. In the latter, the signal bursts are calculated for a certain period of time corresponding to the number of quantization pulses, in this case, the signal bursts of telegraph combinations.

In addition, block 7 issues a signal in block 4 of the presence of a stop parcel in the telegraph text to read the probabilistic characteristics of codes of quite definite significance.

The information from the memory block / signal of the period determining block of code 8 is copied to the accumulator 3. In this case, the sending period is determined by stop parcels between the signal sendings, and not by the signal of block 8, because the block of determining the signal and stop signals passes through this block parcels

The signal of block 7 also enters the block of permanent memory 4, under the influence of which the probability characteristics of the telegraph codes are read into the buffer cascade 9, and from it to the comparator W. The value of the telegraph code is determined by the same block 7.

If synchronous transmission occurs in the telegraph channel, i.e., transmission without service parcels or with them, but of the same duration as the signal parcel in telegraph transmission combinations, and the ratio of current parcels to non-current ones does not match the previously established ratio, the parcel period is determined the code period determination unit 8, after which the information from the memory block / is accumulated by the parcel combinations in the accumulator 3. Comparator 10 compares the values of the probable characteristics of the codes in the constant block constant memory 4, the data transmission frequency in the stacker 3.

If the cumulative frequency code values in. the received transmission corresponds to the probability data of block 4, this means that the code is defined, and the signal from comparator 10 is fed to the indicator (not shown in the drawing).

If the transmission rate has changed, i.e., the duration of the signal package does not correspond to the pulse duration of the generator 6, the block 7 for determining the signal and stop parcel sends a signal to the change block

the quantization frequency 5, which generates the error signals to the generator 6. Depending on how the duration of the signal signal in the received transmission has changed, the duration of the pulses of the generator 6 changes up or down, i.e., the input information is automatically tuned.

Subject invention

A device for recognizing telegraph codes by the parity ratio of parcels, comprising a generator to which a frequency changing unit is connected, a parcel counting unit included at the input and a memory unit whose output is connected through a code period determining unit and a drive to a comparator enabled at the output device, as well as a block of permanent memory, connected via a buffer cascade to a comparator, characterized in that, in order to accelerate the recognition of a code by its probabilistic characteristics, fixed in constant memory block detecting signal is entered and stop parcels inputs connected to the input device and the generator, and outputs - to the block frequency variations to block counting polarities parcels to block permanent memory unit and to determine the code period.