SU767829A1 - Device for magnetic recording of digital data - Google Patents

Description

one

The invention relates to the field of instrumentation, in particular to the technique of magnetic recording, and can be used in digital recording equipment.

A device is known for controlling 5 recording of signals onto a magnetic medium containing a pulling mechanism, magnetic recording and reproducing heads, each of which is connected to its own amplifier, Lormirovo tO, and a logic element loaded on the actuator.

The device is simple in its circuit design and monitors the operability of the magnetic recording apparatus 15 by the presence of a reproduced signal at its output (control playback). It can be used in multi-channel magnetic recording equipment - playback, but 20 has the following disadvantages. If there is no output on the device one by one, it is unknown from the playback signal channels which device of this channel is out of order: the recording device or the playback channel device, as a result of which the multithreaded equipment makes the time-consuming device of pass-through channels 30

which increases when a malfunction occurs, the recovery time of the device during its operation. In addition, it is impossible to use the device for the monitoring of the working capacity of devices that only record information, i.e. not having playback channels 1.

The closest to the invention to the technical essence is a device for magnetic recording of digital information, containing recording channels, each of which includes series-connected coding unit and recording amplifier, as well as an exemplary resistor, switch, indicator and recording magnetic head 2.

When recording information simultaneously over many channels, this device requires a large number of measuring devices, which causes an increase in equipment size, or using a single measuring device requires a switch to alternately connect this device to the sample resistances of all recording channels, which greatly complicates the monitoring process. . Using this service, you can control the formation of the recording current of each channel in the process of recording information, which is necessary for switching the incoming information 1H to a valid recording channel or to ensure the backup device is switched on when the main device fails. P; spruce of the invention - reducing time. detection of a faulty recording channel. The goal is achieved by the fact that the switch is made in the form of two times; key elements, additionally introduced trigger / rectifier and separator-capacitor, with one bus output amplifier for. the recording is directly connected to the recording head, and the second is from different-key elements connected in parallel to the sample resistor, and one of the outputs of one key element is connected to the input Tr | Igger, the output of which is connected to the input through the split capacitor and rectifier indicator. The drawing shows a schematic diagram of a single channel of device recording option (multichannel equipment will contain all the channels of the recording of a similar structure) The recording channel of the device contains serially connected coding unit 1, amplifier 2 recordings with two anti-phase outputs 3,4, -resistor 5 and zap -sanding magnetic head 6. In parallel with resistor 5 and transistor switches 7,8 connected to each other, the collectors of which are connected to the inputs of trigger 9. Resistors 10,11 are collector loads of transistor cells. yuchey 7,8. the trigger 9 through the separation capacitor 12 and the rectifier 13 is connected to the indicator 14. The h1 bus bus 15 serves to send a signal about the health of the recording to the equipment diagnostic system. The pulses of information for recording enter the coding unit via bus 16. The device operates as follows. In the process of receiving information pulses through bus 16 into coding unit 1 in the circuit of the recording magnetic head 6 connected by one output directly and the other through a resistor 5 to antiphase Outputs 4.3 and Recording Amplifier 2, the direction of flow of the recording current changes according to the law of arrival of information and the selected coding method. The leakage through the resistors then records creates a voltage drop across it that unlocks transistor switch 7 or transistor switch 8 depending on the current direction. Unlocking transistor switches 7 and 8 alternately causes periodic flip of trigger 9, at the output of which a pulse voltage living This voltage rectifies and goes to the indicator 14, the luminescence of which in this case will indicate the normal formation of the razopolar recording current in the magnetic head circuit in the process of recording information and, consequently, the health of the entire given magnetic recording channel. head inclusive. The signal about the health of the bus 15 can be sent to the multi-input circuit And, the remaining inputs of which will receive similar signals from other recording channels of the device. In this case, the output signal of the scheme And you can quickly assess the performance of all recording channels. When information arrives at the input of this channel. Record trigger 9 will not switch and, next -. Of course, there will be no voltage at the input of the indicator 14, and a signal about the health of the channel on the output bus 15: in the following, for example, cases of failure of the recording channel; there are no pulses of coded information at the output of the coding unit, while the magnetic head 6 and the resistor 5 continuously flow in one direction and, accordingly, one of them is constantly open. transistor switches 7,8; the write current is generated only by one polarity due to a failure of one of the arms of recording amplifier 2, only one of the transistor switches 7 or 8 will periodically open; the amplitude of the recording current has decreased to a value when the fall for example -. marry resistor 5 is less than the threshold unlock transistor switches 7, 8; an open circuit in the magnetic head 6. The technical and economic efficiency of the invention is generated by reducing the search time for a faulty device in a multichannel digital magnetic recording apparatus. Lormula of the invention is a device for magnetic recording of digital information containing recording channels, each of which includes serially connected coding unit and recording amplifier, as well as an exemplary resistor, a switch, an indicator and a recording magnetic head, characterized in that detection of a faulty recording channel, the switch is made in the form of two different polarity key elements, a trigger, rectifier and coupling capacitor are additionally introduced, with one bus the recording amplifier's current is directly connected to the recording head, and the second through the opposite polarity key elements connected in parallel to the reference resistor, and one of the outputs of one

the key element is connected to the input, the output of which is connected to input1 "1 indicator through an isolating capacitor and rectifier,

1 Information sources taken into account in the examination

D. USSR Author's Certificate 396715, cl. G 11 B 27/36, 1971.

2. USSR author's certificate 351234, cl. G 11 5/00, 1971 (prototype).

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Claims (1)

Claim A device for magnetic recording of digital information containing recording channels, each of which includes a coding unit and a recording amplifier connected in series, as well as an exemplary resistor, switch, indicator and magnetic recording head, characterized in that, in order to reduce the detection time of a faulty recording channel , the switch is made in the form of two bipolar key elements, a trigger, a rectifier and an isolation capacitor are additionally introduced, with one recording amplifier output bus The recording head is directly connected, and the second is connected through bipolar key elements connected in parallel with the model resistor, and one of the outputs of one key element is connected to the trigger input, the output of which is connected through the isolation capacitor and rectifier from the indicator inputs.