SU628619A1 - Receiver in digital signal asynchronous interfacing systems - Google Patents

Description

The invention relates to telecommunications and can be used in multichannel communication systems for the transmission of asynchronous pulse sequences.

A receiving device in the asynchronous interface of digital signals is known, containing the first OR or NO elements and storing the unit, another way through which the auto-tuning generator connected in series and the phase detector is connected to the output of the first el & M net NO, command decoder, first and The second output of which, respectively, is connected to the first inputs of the second and tr & there are NO elements, the outputs of the latter are connected to the other inputs of the first elements, OR and NO, respectively, and the output of the auto-tuning generator is connected to another input of the phase detector

However, the known receiver in asynchronous conjugation systems 1СФРО. OU signals has 1 very high noise immunity of reception, so

as a distortion of two or more commands leads to frame alignment failure.

In order to improve noise immunity, a second OR element and a trigger are introduced in the asynchronous digital signal interface systems in the proposed receiver, the first and second OUTPUTS of the decoder i command being connected respectively to the first and second inputs of the second OR element, the output of which is connected to the first trigger input, another the input of which is connected to the output of the phase detector, and the trigger output is connected to the second inputs of the second and third NO elements.

FIG. Figure 1 shows the functional diagram of the proposed receiver in the asynchronous interface systems of digital signals; in fig. 2 - timing diagrams for the operation of the device

Claims (1)

The receiver in the asynchronous interface systems of digital signals contains serially connected first elements OR 1, NO 2 and for the switching unit 3, another input of which is connected through a serially connected oscillator 4 with self-tuning and phase detector 5 connected to the output of the first element NO 1, a decoder 6 commands, its first and second outputs, respectively, are connected with the first inputs of the second and third elements NO 7 and 8, the outputs of which are connected respectively to the other inputs of the first elements OR 1 and NO 2, and the output The auto-tuned generator 4 is connected to another input of the phase detector, the second element OR 9 and the trigger 10, the first and second outputs of the decoder 6 commands connected to the first and second inputs of the second element OR 9 respectively, the output of the last .. connected to the first trigger input 10, the other input of which is connected by g output of the phase detector 5, and the output of TpKr hera 10 is connected to the second inputs of the second and third elements NO 7 and 8, the input 11 is supplied with a decompressed information signal to the input 12 - clock recording frequency from the block, to input 13 - code stuffing commands further comprises an output device 14. The receiving device in the asynchronous digital signal interfacing systems operates as follows. The information signal from input 11 is recorded in the storage unit 3 using the clock frequency of the recording coming from input 12 through the first element OR 1 and the first element NO 2 to the first input of the storage unit 3. The decoder 6 commands from the sequence of alternating commands from input 13 selects paired commands of one character and, in the case of a pair of negative commands, forms at its first output a signal that makes an additional entry to the storage unit 3 through the allowed second element NO 7 and the first element OR 1 Combustible commands The signal from the second output of the decoder 6 commands through the permitted third element NO 8 prohibits the first element NO 2 for a time equal to one period of recording pulses, and therefore the information in the storage unit 3 is stopped. In both cases, the generator 4 is auto-tuned. and smoothly shifts the reading pulse sequence at the second input of the jamming unit 3 in one direction or another (depending on the command sign) for one period. This reorganization takes place in a time slightly less than the formation period of the pair commands. At the moment when the shift between the write and read frequencies reaches 2, the phase detector 5 turns off the rebuilding of the geyator 4 with auto-tuning and cocks trigger 10, while the second and third elements of NO 7 are resolved and 8, which skip the first detected pair command from the decoder 6 commands. The same command through the second element OR 9 resets the trigger 10. The elements NO 7 and 8 are prohibited and do not pass from the decoder 6 commands all subsequent pair commands resulting from interference in the channel connection, until testing the already received command, and trigger 10 is not cocked. In FIG. 2, a shows the change in the phase of the read frequency relative to the write frequency DF), and FIG. 2, сГ- corresponding to him the structure of commands formed in the transmitting device. When the phase difference is attained ± JZit, paired commands are formed (-and or -). At smaller phase shifts, a sequence of commands (+ - + - +) is alternated with. Since after the arrival of the pairing command, the receiving device locks its input for the entire time it has been working off and opens it only shortly before the arrival of the next pairwise command (Fig. 2, d), any distortions, including And single commands (Fig. 2, ), did not lead to frame synchronization failure. Thus, in this receiver, the noise immunity of the reception is increased, which allows reliable communication on radio links with an energy deficit and high level of interference. Claims Receiver in asynchronous interface of digital signals containing serially connected first elements OR, NO and storage unit, another input of which through serially connected generator with automatic control and phase detector connected to the output of first element NO, command decoder, first h second outputs which, respectively, are connected to the first inputs of the second and third elements NO, the outputs of which are connected respectively to other inputs of the first elements OR and NO, moreover, the output of the generator J is automatically controlled, connected to another input of the phase detector, which is 6 so that, in order to improve noise immunity, a second OR element and a trigger are introduced, the first, “second outputs of the decoder of commands are connected respectively to the first and eye inputs of the second OR element, the code of which is connected to the first trigger input, the other input of which is connected with the output of the phase detector, and the trigger output is connected to the second inputs of the second and third elements of NO. , Sources of information taken into account in the examination:  one . USSR author's certificate No. 470924, cl. H 04 J 1/14, 1973. 1 | distorted horses