SU1322294A1 - Interface for linking digital computer with magnetic tape recorder - Google Patents

Abstract

The invention relates to the field of computer technology and can be used in the development of devices for exchange with a tape recorder audio. The aim of the invention is to increase the reliability of information transfer. The device comprises an input channel 33 and an output channel 34. The device provides increased reliability of information exchange through the use of bi-phase Manchester coding of dressings in the device output channel. 3 il. S (L ut.}

Description

The invention relates to computing and can be used in the development of devices for exchanging audio tape cassette recorders.

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

Figure 1 shows the functional diagram of the device; figure 2 - timing diagram of the output channel; FIG. 3 is a timing diagram of the input channel operation.

The device contains a comparator 1, the first one-shot 2, the waiting generator 3, the second one-shot 4, the generation of 5 pulses of the following f torus 5 cycles, counters 6 and 7, the first signal, thus the bi-phase encoder trigger 8, the second trigger 9, the third trigger 10, second trigger 11, fifth, fourth triggers 12, 13, first 14, third 15, second 16 elements AND-NOT, 20 Such encoding of the dressing ensures the first trigger 17, fourth element, depending on the incoming IN-AND 18, the element And 19, the fifth 20, the sixth 21, the seventh 22, the eighth 23 elements AND-NOT, the Converter 2A straightway a single pulse into a sine wave, a third one-shot 25, a device 26 input for connecting to a tape recorder readout output, a device 27 input for connecting a resolution output of a digital computer, a device 28 output for connecting an interrupt input of a digital computer, a device input 29 for connecting an information output of a digital computer, output 30 devices, start-stop recording-read packages. When a logical O device arrives at input 29 on the trigger of trigger 8 in sync impulse 5, parcels of duration T are formed from the output of counter 7, and the potential of parcels is reversed through T and their frequency f 1 / 2Т (Fig. 2d, e, f) . Upon enrolment

 About to the input 29 of the unit potential device for T a negative full pulse frequency is generated from the output 28 of the device at the output of the trigger 8

1 / T „, obesko;

assumptions (fige). And each subsequent premise always starts with a potential change on the first trigger.

formation of the formation of the output signal, the initial phase of which depends on the phase of the previous signal, Proceed 25

rectangular pulses to the input of the converter 24, where the high-frequency components are filtered, as well as a decrease in the amplitude of the output signal to the recording input of the tape recorder. As a result, the characteristics of the input signal and the tape recorder are coordinated, and the signal distortions in the recording path are reproduced and connected to the recording input.

tofona, output 31 of the device for 35i (fig.2g).

information entry point

sync output 32, channel

ode, channel 34 output.

filtering out the right ones as well as the output signal, the recording input of the record, providing the characteristics of the background input as well as the signal to the ground

In the mode of sets one triggers and when this is blocked the ale of the nitrophone is on

40

In the input mode of a digital computer, input 27 provides a single potential. All triggers and counters are reset. In this case, the counter 7 is blocked and the element AND 19 is unblocked. From the output of the tape recorder, the analog information with biphasic coding is sequentially received from the output of the tape recorder on the device as follows.

In the output mode, the digital computer on input 27 exposes a zero potential (Fig. 2aX). At the same time, the lock is removed from counter 7 and it goes into the dump mode. When the signal level of the input pulses from the generator at the input of the comparator 1 is reached, the threshold is 5 cycles From the first output of the counter 7 to the synchronous inputs of the triggers 8 and 11 the sequence of pulses comes (Fig.26), and from the second output of the output 50 of the comparator 1 of the second single-oscillator 7 - the sequence the impulse 4 forms short pulses with twice the reduced frequency following (FIG .2c) On the negative differential pulse from the device output 28, the digital computer alternates information bits at the device input 29, and the digital computer converts the pre-parallel code into a serial one, complements its control bits at its output and produces a voltage drop (Fig, Over) On the back and on the leading edge of the pulses with

(fig.Zv), which then go through the element And 19 to the trigger inputs of the first one-shot 2 and the waiting generator. Moreover, the first one-shot 2 is triggered on the leading edge of the pulse from the output of the element I 19 (Fig. 3b). The pulse from the output of the first one-shot 2 is less than the duration of the pulse f followed by the biphasic coding. This encoding provides for

start-stop recording-read packages. When the logic device O arrives at the input 29 on the trigger of trigger 8, parcels of duration T are generated from the output of counter 7, and the potential of parcels is reversed through T and their frequency f 1 / 2Т (Fig. 2d, e, f). Upon enrolment

A single full period of frequency is formed at the output 29 of the unit potential device during T by a negative differential pulse from the output 28 of the device at the output of the trigger 8

1 / T „, obesko;

assumptions (fige). And each subsequent premise always starts with a potential change on the first trigger.

impulses of following f the furnace thereby biphasic coding. Such encoding of sowing provides, depending on the incoming information

formation of formation of the output signal, the initial phase of which depends on the phase of the previous signal,

rectangular pulses to the input of the converter 24, where the high-frequency components are filtered, as well as a decrease in the amplitude of the output signal to the recording input of the tape recorder. As a result, the characteristics of the input signal and the tape recorder are harmonized, and the signal distortion in the recording-reproduction path is also reduced.

In the input mode of the digital computer, input 27 exposes a single potential. All triggers and counters are reset. In this case, the counter 7 is blocked and the element AND 19 is unblocked. From the output of the tape recorder to the device input 26, analog information is sequentially received with bi-phase coding of the dressing. When the level of the signal at the input of the comparator 1 reaches the threshold for the output of the comparator 1, the second one-oscillator 4 generates short pulses

syrup When the level of the signal at the input of the comparator 1 reaches the threshold for the output of the comparator 1, the second one-oscillator 4 generates short pulses

a voltage drop is formed at its output (fig, per), along the trailing and leading edge of the pulses with

45 syrup. When the signal level at the input of the comparator 1 reaches the threshold of the output 50 of the comparator 1, the second one-oscillator 4 generates short pulses

(fig.Zv), which then go through the element And 19 to the trigger inputs of the first one-shot 2 and the waiting generator. Moreover, the first one-shot 2 is triggered on the leading edge of the pulse from the output of an element And 19 (Fig. 3b). The pulse duration from the output of the first one-shot 2 is less than the length of the pulse from the output of the element 19: Gf, which provides a pulse from the one-shot 2 through the element AND-NOT 18 pre-zeroing the counter 6 and blocking the waiting generator 3 at the beginning of the parcel being analyzed. By the beginning of the start of the generator 3 by the negative difference (O) of the pulse, the counter 6 is zero, and the generator 3 is in the initial (waiting) state. On the front (0) of the signal at the input, the generator 3 starts, which begins to form a sequence of short | Pulses with a period

t

T - y - gene. 8 K

where K 1,2, ..., t (fig.Zg).

Moreover, the first impulse generator 3 generates immediately at the beginning of the launch (Г -.0).

Depending on the composition of the information received at the device input 26, the input channel functions as follows.

Upon receipt of zero sums - intervals I and II, single parcels interval III, failed parcels (nonzero and single units) - interval IV (fig.Za).

When the receipt of zero powders, the generator 3 generates at the counting input of the counter 6 counting pulses during the entire duration of the parcel T ,,.

When the fourth pulse arrives at the input of the counter 6 from the output of the generator 3, a single potential is established at the first output of the latter, according to which the trigger 12 is set to one state (Fig. 2e), since its D input is 1. At the same time, the period duration following the pulses of the generator 3 is selected, for example, from a ratio.

L Thus, through time 3/8 T t, (three periods of generator 3) from the start of sending, trigger 12 is set to 1, and during further operation of generator 3, for example, by the sixth counting pulse, counter 6 through time T "(5 periods T) establishes unit levels at its first and second outputs. The element AND-NOT 20 is triggered, the output of which exposes a zero potential, which

About 5

,

0 5

0

It enters the first input of the element IS-NOT 22. The zero potential at the input of the latter causes the appearance of a single (zeroing) potential for the triggers 8.12 and 13. Trigger 12 through the sixth pulse from the beginning of the sprinkling (through five periods T of the pulse sequence) tired to zero state. Upon further receipt of the pulses from the generator 3, a single potential is established at the third output at the input of the counter 6 at its third output, which causes the trigger 10 to be set to the single state (FIG. 3).

Thus, through time / 8 T from the beginning of the zero dressing, a single potential is established at the first input of the second element NAND 15. At the end of the dressing after time T, an impulse (Fig. 3b) appears at the output of the odiovibrator 4, through which the AND-NOT element is gated 15. A negative pulse from the output of the latter sets the trigger 17 to its zero input to the zero state and goes to the second input element AND-NOT 16, a positive impulse appears at the output of the latter (Fig. 3i). On the back (negative) pulse front from the output of the NAND 16 element, a third one-shot 25 is triggered (Fig. 3k), and a signal appears at the output 32 of the device that accompanies the information previously recorded in trigger 17. The sync signal from output 32 of information from output 31 is copied to a digital computer. In addition, a negative pulse from the output of the one-shot 25 through the IS-HE elements 22 and 23 sets the trigger 10 to its initial state. Along with this, a one-shot 2 is triggered on the leading edge of the pulse of the one-shot 4, the signal from which through the IS-NE 18 element zeroes the counter 6 and blocks the generator 3.

Upon receipt of a single sprinkling of a tape recorder (interval III, fig.Za), the single-vibrator 4 triggers three times during a parcel according to the input signal level: at the beginning, at the end of the parcel and at its middle. On the first front of a single parcel, generator 3 is started, and its first impulse is generated at the end of the trigger pulse () from the output of 513222946

ment and 19 (fig.Zg). When a device arrives at output 32, a further pulse from the gene output appears. The signal accompanying the recorded RATOR 3 to the counting input of the counter 6 earlier in the trigger 17 information, which changes its state of the third information from the output 31 of the output outputs according to the number received in the DVR. In addition, the signal of the counting pulses. With the output of the one-shot 25 through the output of the fourth pulse to the input, the NE-NE 22 sets the trigger of the counter 6 to the initial (zero) connection the unit potential is set to the initial (zero) connection.

This is where the trigger 12 is set. On a frontend, this occurs in a single state. Thus () a pulse from the one-shot, after time t, 3/8 T, that 4 starts the one-shot 2, with the output corresponds to the duration of the three half of the last signal through the elementary periods of the pulse sequence, AND-NE 18 zeroes the counter 6 and blocking of the generator 3 from the beginning of the unit 5 generator 3. The device is ready for powder dressing, at the information input it receives the following parcels. In the case of the flip-flop 13, a single arrival at the input 26 of the device appears. According to the second differential in the semiconductor suction (interval IV, fig.Za), the unit sprinkling is triggered if the strobe-pulse (end of sprinkling) the second one-shot 4 (fig.Sv), 20 goes through a time longer than the pulse from the output the interval T after the element I 19 is sent to the synchronous input of the trigger signal of the sending, then, according to the tenth imperial 13, the last pulse in the pulse is always on the second and third output states (fig.Zh). 6 — single potentials. In addition, after the leading edge, elements I-1GE 21 and 23 are triggered, the signal from the output of the element I 19 behind the output of the latter triggers the first one-shot 2 trigger 10. When it arrives short (Fig. 36), the negative impulse with outflow of scree with a duration less than the course of which goes through the element tо, 3/8 T ,, none of the triggers 9, N-HE 18 to preliminary zeroing, o, 12 and 13 does not change its state - counter 6 and generator 3 interlocking, " < R ' sync pulse not transferable into idle (output used. Temporary state used. On the falling edge of the selection of input inputs, the provision of the - signal at the input triggers reception only reliably of the generator 3, which begins, at intervals, the time intervals for the formation of a sequence of selection of single and zero pulses with a period T -v-, and the parcels can be changed by the very first impulse formed immediately. connecting the corresponding slots at the start of the start (). At ° ° "°" of the counter 6 and the choice of the period of the arrival of the fourth pulse on the generator 3 pulses from the ratio of the input of the counter 6 at its first output Ta

a single potential is established,, 8 K, .f., m. on which the trigger is set.,

Claims (1)

9 in a single state (FIG. 3). In the claims of this, the unit potential enters to the first input of the first NAND element. A device for interfacing a digital computer with 14. When entering a mono-tape recorder at the input, containing the channel of the third inverter 4 of the third differential unit “yes, including the first trigger and presetting the third pulse from the output of the single generator the rectangular impulses of the vibrator 4 gates through the element into a sinusoid, the output of which is connected AND 19 the first element AND NOT 14, at the output with the output of the device for connecting de which appears negative to the recording input of the tape recorder, the channel pulse through which the trigger 17 mouth - From the input, which includes the comparator, the input is poured into a single state of which is connected to the input of the device (FIG. 3L). On the falling edge () to connect the readout output of the ma-signal from the output of the IS-NE element 16 of the recorder, the first one-shot, the one-shot 25 is released (FIG. 3k), the ment And, the counter, first to third elements AND-NOT, the first trigger, the output of which is connected to the output of the device for connecting the information input of the digital computer, the second trigger, the output of which is connected to the first input of the first AND-NOT element, the output of which is connected to the single input of the first trigger and -NO, the third trigger, the output of which is connected to the first input of the third NAND element, the output of which is connected to the zero input of the first trigger and to the second input of the second AND NAND element, characterized in that, in order to increase the reliability of transmission information, a counter, a clock generator and a second trigger are entered into the output channel, and in the output channel the clock generator output is connected to the counter input of the counter, the reset input of which is connected to the input of the device for connecting the resolution output of the digital computer, the first output of the counter is connected to the synchronization inputs of the first and second triggers, the second output of the counter is connected to the output of the device for pod; Key input interrupt DVR, a single input of the second trigger is connected to the input of the device for connecting the information output DVR, Exit second flip-flop is connected to I, K rows vho- first flip-flop, whose output 30 are connected to the second inputs of the seventh and eighth elements of the NAND, respectively, the single inputs of the third and r1 - of the same triggers are connected to the bus of the unit potential of the device, vyysod j connected to converter input square impulses in a sine wave, 35 of the seventh element AND IS NOT connected to The second, third inputs are entered into the input channel by the second, fourth, and fourth to eighth one-shot AND-NOT elements, the waiting generator of impulse triggers, the output of the eighth element AND-NOT is connected to the reset input of the third trigger, the output of the fifth 40 trigger is connected to the information input of the fourth trigger, the output of which is connected to the information input of the second trigger. pulses, the fourth and fifth triggers, and in the input channel the output of the comparator is connected to the input of the second single vibrator, the output of which is connected to the first input of the element I, the second output of which is the first input fourth 0 The I-ilE element is connected to the input of the device for connecting the resolution output of the digital computer, the output of the AND element is connected to the second inputs of the first and third AND-NOT elements, to the synchronization input of the fourth trigger, to the input of the first one-vibrator and to the prohibition input of the waiting pulse generator, the output of which connected to the counting input of the counter, the reset input of which is connected to the enable input of the waiting pulse generator and to the output of the fourth NAND element, the second input of which is connected to the output 5 of the second one-shot, the first counter output is connected to the first inputs of the fifth, sixth NAND elements, the second counter output is connected to the synchronization inputs of the fifth trigger and the second trigger, and the second input of the fifth NAND element, the third output of the counter is connected to the input synchronization of the third trigger and with the second input of the sixth AND-NES element, the output of the third 5th one-shot is connected to the first inputs of the seventh and eighth AND-NOT elements and to the output of the device to connect the clock input of the digital computer, the outputs of the fifth, sixth AND elements E 0 are connected to the second inputs of the seventh and eighth elements of the NAND, respectively, the single inputs of the third and r1 - that of the flip-flops are connected to the bus of the unit potential of the device, vyysod The fifth trigger, the output of the eighth element is NOT connected to the reset input of the third trigger, the output of the fifth trigger is connected to the information input of the fourth trigger, the output of which is connected to the information input of the second trigger. but) 6) b) d) e) e)) lgllllllish FIG. 2 Via 3 Editor N. Bobkova Compiled by S. Buruhin Tehred And, Popovich Proofreader S. Cherni Order 2866/46 Circulation 672 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4