SU896790A1 - Device for automatic selection of receiving facsimile apparatus rate - Google Patents

Description

(54) DEVICE FOR AUTOMATIC SELECTION

RATE OF RECEPTION FAX

1 The invention relates to facsimile technology, namely, automatic control devices for facsimile receivers. A device for automatic selection of the speed of a receiving facsimile apparatus is known, containing sequentially switched on integrals, threshold and forming blocks, a time relay that is connected to a control unit consisting of a counter, a decoder, keys and executive relays via a start counting key, and a trigger , adder, coincidence blocks, reference impulse generators, additional time relay, additional key, additional trigger and facsimile transmission end determination block, with output pho the rmiruyuschey block is connected to the first inputs of the blocks of coincidence directly, and to the second through a serially connected additional key, trigger and corresponding gene

Claims (1)

The RATOR of the reference pulses, the second inputs of the trigger and the generators of the reference frequency are connected to the output of an additional time relay, one of the inputs of which is connected to the output of the trigger, and the other to the output of the time relay, the outputs of the coincidence blocks are connected to an adder, the output of which is connected to the inputs account start key and time relay; the control input of the auxiliary key is connected to the output of the auxiliary trigger, one of the inputs of which is connected to the output of the time relay, and the other input through the terminal block No facsimile transmission is connected to the output of the integrating unit fl. However, the known device is cumbersome and not sufficiently protected from incorrect speed selection due to the loss of part of the signals when there is a failure in the communication channel. The purpose of the invention is to improve the accuracy of the nyVeM to prevent spurious 389 triggers while simplifying the device. To achieve this goal, a device for automatically selecting the speed of a receiving fax machine, comprising a series-connected integrating unit, a threshold unit and a forming unit, the output of which is connected to the first input of the match unit, as well as a generator, the output of which is connected to the second input of the coincidence unit, counter , to the first input of which the output of the block of matches is connected, and to the BTODOMV input - the output of the adder, with the first output of the counter connected to the first input of the decoder, the executive relays and the unit determining the end of the facsimile transmission, the input of which is connected to the input of the integrating unit, an additional descrambler, additional counters, the number of which is equal to the number of executive relays, and a cut pulse shaper are input, the cut shaper pulse input is connected to the first input of the adder and to the second input the decoder, the outputs of which are connected to the first inputs of additional counters, the second output of the counter through an additional torus is connected by the third input of the coincidence block, the output of the block is defined dividing completion of facsimile transmission is connected to the second inputs of the additional counters, the outputs of which Con cheny to respective inputs of the adder and to an input of each of executive relay, respectively. FIG. 1 shows a structural electrical circuit of the device; in fig. 2 - timing diagrams for the operation of the device. The proposed device contains integrating unit 1, threshold unit 2 and forming unit 3, generator 4, unit 5 coincidences, counter 6, additional decoder 7, decoder 8, additional counters 9, executive relays 10, cutoff pulse former 11, and facsimile transmission termination determination unit 13. FIG. 2 a, b, c are shown three times. novidity of phase pulses, which determine, respectively, the choice of large, medium, and lower speeds coming from the shaping unit 3. In FIG. 2 b shows also (dotted line) a false pulse or a pulse of interference with a duration longer than phase pulses. FIG. 2 g shows the signal from the output of block 5 of coincidence when a phase pulse arrives, for example, the average speed of FIG. 2 in and false pulse; FIG. 2 d. The signal from the output of the cutter pulse former 11; in fig. 2e - signal from the output of the decoder 8; on fng. 2-gK.- signal from the output of the additional decoder 7; in fig. 2 is a signal from the output of block 13 for determining the end of a facsimile transmission; in fig. 2 tb is the signal from the output of the corresponding counter 9. The device operates as follows. The input signal comes from the forming unit 3 to the first input of block 5 matches and allows the passage of pulses from generator 4 to the first input of counter 6. Allowing potentials corresponding to the number of these pulses go to decoder 8. At the time of the end of the input signal block 5 matches coincide , and in the cut-off pulse shaper 11, an impulse of the trailing edge of the input signal, which is fed to the control input of the decoder 8, is generated, and when it coincides with a certain resolution potential, it appears uyuschem decoder 8. The signal output from the corresponding output of the decoder 8 is stored in a corresponding counter 9, and includes corresponding actuator relay 10, and through the adder 12 resets the counter 6 at the time of transmission. Upon completion of the transmission of the facsimile message, the facsimile transmission termination determination unit 13 generates a pulse, which causes the additional counters .9 to return to the initial state. When the duration of the input signal is longer than all expected, counter 6 stops counting using an additional decoder 7 via the inverting input of block 5 matches, and counter 6 is reset to its initial state using the cutoff pulse former 11 through the adder 12. If the input signal less or does not coincide with the expected value, the counter is also reset using the cutter pulse former 11. When a communication circuit fails during the transmission of speed selection signals, the left response does not occur, since each additional counter 9. accumulates information only from its output of the decoder 8 and the number of accumulated pulses is necessary only for reliable operation of the device. The use of new elements (additional descrambler, additional counters, and a former) favorably distinguishes the proposed device for automatic selection of the speed of a receiving fax machine from the known one, since the possibility of a false response of the device is significantly reduced and thereby the need for retransmission during transmission is reduced. false triggering. In addition, the device for automatic selection of the speed of a receiving fax machine is simple Formula of the Invention An apparatus for automatically selecting the speed of a receiving fax machine, comprising a series-connected integrating unit, a threshold unit and a forming unit, the output of which is connected to the first input of the coincidence unit, as well as a generator, the output of which is connected to the second input of the coincidence unit the counter, to the first input of which the output of the coincidence block is connected, and to the second input - the output of the adder, with the first output of the counter connected to the first input of the decoder, execute The relays and the unit for determining the end of the facsimile transmission, the input of which is connected to the input of the integrating unit, are characterized in that, in order to improve the accuracy of preventing false alarms while simplifying the device, an additional decoder is introduced, additional counters, the number of which is equal to the number of actuating relays, and the cut-off pulse shaper, with the shaper input and the cut slice connected to the first input of the coincidence block, and the output to the first input of the adder and the second input the decoder, the outputs of which are connected to the first inputs of additional counters, the second counter output is connected via an additional decoder to the third input of the coincidence unit, the output of the facsimile transmission definition unit is connected to the second inputs of additional counters, whose outputs are connected to the corresponding inputs of the adder and to the input of each executive relay respectively. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 590866, cl. H 04 N 1/36, 08/12/76 (prototype). / f / / hr / V VO WGW tn "M