SU1260969A2 - Interface for linking digital computer with audio magnetic tape recorder - Google Patents

Abstract

Scratch refers to digital computing and can be used to interface a digital computer with a tape recorder. The aim of the invention is to increase the reliability of reading information. The interface device contains a synchronization unit, an input channel, an output channel, an address decoder, a command decoder, a device readiness signal generating unit. The device provides increased reliability in reading information due to the use of two channels of an audio tape recorder during recording and reproduction, the second channel being used for synchronization. The invention is additional to auth.St. No. 1188745. 3 Il. (p (L with 0 th go

Description

The invention relates to digital computing (s) and can be used (1; for pairing a digital H (1st computer) (PC) with a sound recorder.

The purpose of the invention is to increase the reliability of reading information.

FIG. shows a block diagram of an interface device; figure 2 - structural diagram of the input channel; Fig. 3 is a block diagram of the output channel.

The device contains synchronization unit 1, input channel 2, analog information output 3 of the first channel of the device, output channel 4, outputs 5-8 of synchronization unit 5, third input 9 of output channel 4, first 10, second 11 and third 12 outputs of output channel 4, decoder 13 addresses, a decoder 14 commands, a node 15 forming the device readiness signal first output 16 of channel 2 of input, output 17 of decoder 13 addresses, second output 18 of channel 2 of input, first 19 and second 20 outputs of decoder .14 commands, third output 21 of input channel 2 , bus 22 readiness reset, fourth exit 23 channel 2 input and fourth input 24. channel 4 output

Input channel 2 is formed by optocoupler element 25, element OR 26, first element AND 27, code message end generator 28, serial code to parallel converter 29, parallel code to serial converter 30, input channel control trigger 31, element 32 , the second element is AND 33, the counter 34, the element OR 35, the first modulator 36 ,, parity bit shaping circuit 37 and the second modulator 38,

The output channel 4 contains the analog information converter 39 of the first channel of the tape recorder, the serial code 40 converter to parallel, the decoder 41, the synchronization trigger 42, the counter 43, the parity check element 44, the output channel control trigger 45, the digital parcel driver 46, the element And 47, counter 48, element OR 49, galvanic isolation element 50, element 51 at the same parity level, analog information converter 52 second. go channel tape recorder, output 53 tak609692

output pulses record information channel input and input 54 synchronize input information channel output. The proposed device works

5 as follows.

The information zone, recorded on a magnetic tape, consists of code packages, issued by the digital computer in response to the Ready command, which is formed in the device for interface. The first word of each parcel is service. It contains the device address and operation code. A little words are informational. The first of the N parcels contains the synchronization bytes, the second post contains the information on the zone number, “the subsequent posts are informational. The length of the parcels and zones is chosen from the conditions of convenience of hardware implementation, programming and information processing. The last of the N parcels contains the command End of Exchange.

The first word of the parcel is in Play mode (i.e.

25 reading information from a tape recorder and transmitting it to a digital computer) - service. It is the word Ready, formed in the mating device. Ate food 1e words - informational.

30 The number of read words is set programmatically and fixed by the number of received words Ready.

Consider the operation of the device co-stv in recording mode, i. when recording information from a digital computer to a magnetic tape.

On buses O and 11, which is a bipolar communication line, information with a digital computer is fed to the input of channel 2 of the input. The output of the digital computer and the input of the device for coupling are galvanically developed using an optocoupler pair 25. - At the output of the block 26, clock signals of the digital computer are generated. In the initial state, -. SRI on bus 12 there is a signal to read information from a digital computer. Signals from the output of block 26 through element 27 are fed to the synchronization input of a serial-to-parallel converter 29 to the signal generator 28 End of the send and to the third modulator input 38.

Form (signal 28) The end of the parcel is a connection by the integrator of the RC chain, computer, and pulse shaper. After the effect on the integrating chain of the signal sequence sequence code,

40

45

The value on it changes. When a certain threshold is reached, a comparator is triggered, as a result of which a pulse.c is formed at block 28. At the output of block 25, a signal is generated corresponding to the presence of the edt-schichoy information in the parcel and arriving at the information input of the sequencer code generator 29 in parallel, which is a register of 10 C pulses corresponding to the sync shift. At its outputs, after the end of the information bogus, a parallel code is generated from the DVR, in bits Op-7p of which contains information on the address cipher and the radio code, which is transmitted via bus 18 to the input of address decoder 13 and command decoder 14. The information from the 8th to the Nth bit is transmitted to the input of the converter 30 of the parallel code 20 to the serial one, which is a register operating in the parallel information shift mode. Using the trigger 31, the register 30 via S-INPUT sets 25 seconds to the parallel information recording mode, and on the leading edge of the signal End of the parcel, information is recorded from the register input to its output. On the falling edge of the signal, the end of the trigger, the trigger 31 is set to one, as a result of which the register 30 is shifted to the information shift mode, and the information recording clock from the bus 7 through the AND 33 element when there is a Write command on the bus 19 arrive at the counting input of the counter 34 and through the OR element 32 to the synchronization input of the block 30. At the output of the converter 30, a serial code is formed, which is fed through the OR element 35 to the modulator 36.

Bus 5 and 6 are supplied with frequencies to fill in the information, respectively. O and 1. The counter 34 counts the (N-8) bits, after which the trigger 31 is reset, the register 30 is switched to the parallel information recording mode, the write clock does not pass through the element 33. Over the last N- a parity pulse on element 37 is formed at the output impulse of block 34 output. At output 55 of block 37, potential 1 is formed when there are an odd number of ones in 8-N bits and potential O is at

35

45

50

even number. The signal from the output 3.7 through the OR element 35 is fed to the input of the modulator 36. The signals generated by the output of the modulator 36 for recording on a magnetic tape, corresponding to the information received from the DVR, are recorded on the first channel of the tape recorder.

At the output of the modulator 38 form 5 0 5

five

five

0

pulses of information recording, and go on recording on a magnetic tape through the second channel of the tape recorder.

After the recording of the information on the magnetic tape has been completed, the code package Ready is formed in the device for interfacing and is transmitted to

The formation of the Ready Ready is effected by the signal coming in via bus 2 of the input information block,

To put the device into the information reading mode from a magnetic tape, a code line comes in from the computer (lines 10 and 11), in the first word of which there is a Play operation code. The operation code is decoded in the decoder 14, and the corresponding signal via the bus 20 is fed to the information output channel 4.

The signal Reproduction is fed to the input of the installation in O tri1-gera 42, preparing it for operation.

Analog information from the output of the first channel of the tape recorder via bus 9 is fed to the input of the converter 39, which can be implemented as a digital analyzer. The converted signal, in the form of a sequence of zeros and ones, is fed to the information D input of a serial code to parallel converter 40. Information from the second channel of the tape recorder via bus 24 is fed to block 52, similar to block 39, and the sync input is generated at the output of the synchronization input of converter 40, which is a shift register in which information is shifted: by synchronization pulses, in this case hardwired with the information read. For this reason, disruptions in counted information are excluded completely.

Since the reading of information from a magnetic tape can occur from an arbitrary place, the formation of a code for writing in a digital computer

it happens only after reading the synchronization byte,} in this case two bytes of units. IIpj this at some point in time at all outputs. (From O to M-1) converter

40, potential 1 is set and a positive voltage drop is generated at the output of the decoder 41. The parity check bit of the sync parcel is zero. Therefore, at the output of the decoder, after receiving a 40-bit parity block, a radial difference is formed, i.e. the initial state is established. Negative differential from block output

41 sets the trigger 42 to a single state, enabling the operation of the counter 43, which starts counting the clock signals from the output of the second channel of the tape recorder. Synchronization of reading information, i.e. there is a correspondence between the counting of clock pulses of the read information (the first so-TOBOtviy pulse corresponds to the first bit of information, etc.). For every 17th pulse, the read information is checked for parity. After the parity check is correct, using elements 44 and 51, the trigger 45 is set to one state, allowing the formation of an information boot in a digital computer consisting of the word Ready and two bytes of information received from a tape recorder. A parcel is formed on register 46 with a clock speed that is stepped on bus 8, Taktova often609L9 6

This is chosen in such a way that the transmission of information in a digital computer takes place in a time not exceeding half the period of the frequency of the clock pulses read from the second channel of the tape recorder. The formed parcel as a sequential code, the passage through the galvanic isolation element 50, goes to the JO communication line with the digital computer. The signal generated on the bus 12, blocks the flow of the read information in the input channel.

15

Formulas

the invention

A device for interfacing a digital computer with a tape recorder according to the author. St. No. 1188745, characterized in that, in order to increase the reliability of reading information, a modulator and an analog information converter are inputted into it, where the clock input of the modulator is connected to the output of the input recording information clock, and the frequency inputs O and l are with the corresponding identical outputs of the synchronization unit, the modulator output is connected to the analog input of the second channel of the tape recorder, the analog output of the second channel of the tape recorder is connected to the input of the analog information converter, the output of which is connected ene input to the input sync channel data output.

Compiled by S. Buoukhin Editor L. Pchelinska Tehred M. Khodanych

Order 5234/51 Circulation 671 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and Polygraphic Enterprise, Uzhgorod, st. Project, 4

Proofreader A. T sko

Claims (1)

Claim A device for interfacing a digital computer with magic20 a recording tofon according to ed. St. No. 1188745, characterized in that, in order to increase the reliability of reading information, a modulator and an analog information converter 25 are introduced into it, the clock input of the modulator connected to the output of the clock pulses of the input channel information, and the frequency inputs 0 and 1 with the corresponding one or 3Q with the nominal outputs of the synchronization block, the modulator output is connected to the analog input of the second channel of the tape recorder, the analog output of the second channel of the tape recorder is connected to the input of the analog information converter, the output of which is Valid for prison to synchronize input information output channel. FIG. 2