SU775747A1 - Analogue-digital converter for magnetic recorder - Google Patents

Description

Isofeating refers to the technique of magnetic recording, Q specifically to digital data storage devices, and can be used in telemetry and measurement systems. Frequency analog-to-digital converters for magnetic recorders made with a voltage-to-current converter, a comparator, a pulse generator, and a counting unit LI are known. The disadvantage of the device is a decrease in speed due to additional operations in the counting unit. Of the known devices, the most noticeable in technical terms and effect achieved by the invention is an analog-to-digital converter containing a source of control voltage, a controlled frequency generator connected to the source, a counting unit connected to the output of the controlled generator a clock register and a buffer register code, a timestamp generator, and a comparison unit, whose inputs are connected to the timestamp generator and the counting unit 2. The circuit of the invention is an increase in speed. For this purpose, the proposed device is equipped with a differentiating unit, a memory register and a switch, while the input of the differentiating unit is connected to the output of the comparison unit, the output of the differentiating unit is connected to the counting unit and the control input of the switch, the inputs and outputs of which are connected respectively to the outputs memory register and buffer register registers; FIG. I shows a block diagram of the proposed device: FIG. 2 is a time Hi, i.e. diagrams explaining the operation of the device. The device contains a source of 1 control voltage, controlled by a frequency 2 feeder, made in vi37

before the multi-pass filter, the band-pass filter 3, the control box which controls the blackout block 4, connects the cope with the signal of the counter 1, the counting block 5t buffer register 6 " : 1С1; Pulse watcher 8 and electronic key 9, while the outputs of generator 7 and ftf 3 are connected to the inputs of imput sigt) of unit U compared 1P1 phase, co-opine1P1 of unit 4 matched and with the input of differentiating unit 11. The device also contains switch 12 and register 13 of memory ti.

The device works as follows.

When the device is turned on, the output of the bandpass filter 3 is set

the initial frequency value, which is converted by the counting unit 5 to the code and entered into the buffer register 6. When the initial frequency is measured, the unit 5 switches to the arithmetic mode, and the determined code is added (subtracted) with the contents of the buffer register 6 (the code is determined frequency generator 7 time stamps and is stored in memory register 13).

When the signal changes in the source I code, according to a certain law (Fig. 2a), the frequency at the output of filter 3 changes discretely (Fig. 26). At the output of the comparison unit 10, a signal will be generated as a series of sawtooth pulses (4wr. 2 in the position of which is determined by the sign of the derived signal shown in Fig. 2a. These pulses through the differentiation unit 11 will disconnect switch 12, while in the buffer register 12 produced;

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the ls of the codes contained in the memory register 13 and the buffer register 6, as well as the recording of the result (Fig. 2e) in the past.

The invention improves performance by eliminating the need to calculate the current frequency.

formula of invention

An analog-to-digital converter for a magnetic recorder that contains an 11th control loudspeaker terminal, an adjustable frequency generator connected to a source of control voltage, a counting-flashing unit connected to the output of the controlled frequency generator and the input of a buffer register, a time stamp generator and a comparison unit, the inputs of which are connected to the time stamp generator and the counting block, is also provided with the fact that, in order to increase speed, it is equipped with a differentiating block, a memory register and a switch, while the input of the differentiating unit is connected to the output of the comparator unit, the output of the differentiating unit is connected to the counting unit and the control input of the switch, the inputs and outputs of which are connected respectively to the memory register inputs and the inputs of the buffer register.

Sources of information taken into account in the examination

1. Bakhtiarov G.D. and Dikoy S.L. Analogo- “four-dimensional preobrazo azoegeli.-xZa

1975, No. 1, p. 5290.

2. Karpov R. G. Technique of pulse-frequency modeling. M., Mechanical Engineering, 1969, p. 224-234 (prototype

Claims (1)

Claim An analog-to-digital converter for a magnetic recorder, comprising a control voltage source, a controlled frequency generator connected to a control voltage source, a counting unit connected to the output of the controlled frequency generator and to the input of the buffer register, a time stamp generator and a comparison unit, the inputs of which They are connected to a time stamp generator and a calculating-decisive unit, with the fact that, in order to increase the speed, it is equipped with a differentiating unit, a memory register and a com a mutator, while the input of the differentiating unit is connected to the output of the comparison unit, the output of the differentiating unit is connected to a calculating and deciding unit and the control input of the switch, the inputs and outputs of which are connected respectively to the outputs of the memory register and the inputs of the buffer register.