SU1427421A1 - Magnetic tape marking-out device - Google Patents

Abstract

The invention relates to magnetic recording and makes it possible to increase the reliability of tape marking in the conditions of recording false signals on a tape. From the generator 1 of the marker pulse, through the element OR 2 and the head 3 of the recording, the marker is applied to the carrier. Through the element 10 and the element OR 2, the pulses from the generator 5 are also fed to the recording head 3. The marker reproduced by the reproducing unit 8, through the discriminator 18, causes the appearance of an enable signal at one of the inputs of the element 17, the other input of which is reproduced from block 8 playback. The reproduced signals after divider 11 are calculated by counter 12. If the code combinations of master 19 codes and counter 12 are equal, the code comparison node 13 generates a signal to stop the oscillator 5 receiving frequency pulses through AND element 10 in block 4 of the record. Interference contained on a magnetic tape and reproduced by playback unit 8 is calculated by a counter 12, and the total number of reproduced signals corresponds to the number given by the master of 19 codes. 2 Il. (L

Description

tea. auth.

 one

Fl

The invention relates to a magnetic recording technique, in particular to magnetic tape marking devices.

The purpose of the invention is to repeat the reliability of tape marking in the conditions of recording false signals on the tape.

Figure 1 presents the block diagram of the proposed device; figure 2 - the signals reproduced from the carrier.

The device comprises a marker pulse generator I, the OR element 2 and the recording head 3 included in the recording unit 4, the reference frequency generator 5, the reproduction head 6 and the amplifier 7 included in the playback unit 8, the time interval generator 9, the first element And 10, a frequency divider 11, a counter 12, a code comparison node 13, a second element AND 14, a marker pulse generator 15, a blanking pulse generator 16, a third element AND 17, as well as a discriminator 18 and a unit 19 of codes.

The device works as follows.

From the generator 1 marker pulse through the element OR 2 and the head 3 marker marker is applied to the carrier. The element AND 10 and the element OR 2 also supply pulses from the reference generator 5 to the recording head 3. The marker reproduced by block 8 through the discriminator 18 causes the appearance of an enable signal at one of the inputs of element AND 17, to another input which reproduces the signals from block 8. The reproduced signals after divider 11 are calculated by the counter 12. With the equalization of the code sets of the master 19 codes and the counter 12 by the code comparison unit 13, a signal is generated to stop the arrival of reference frequency pulses ora 5 through element 10 in block 4 of the record. At the same time, the generator 15 of the marker pulse and the generator 16 of the blanking pulse are started at the same time by the signal from the code comparison node 13 through the element 14 and the marker signal 15 of the generator 15 is recorded on the tape at the end of the marking combination and the signal 17. The second recorded marker signal discriminator 18 set to its original state.

Claims (1)

The interference contained on the magnetic tape and reproduced by block 8 is calculated by the counter 12 and the total number of reproduced signals always corresponds to the number given by the setter, which implies that the reproducing part of the device is ideal, i.e. not creating false signals or missing signals. Invention Formula A tape marking device containing the first AND element, the output of which is connected to the recording unit, the reference frequency generator, the output of which is connected to the first input of the first And element, the playback unit whose output is connected to the output of the time interval generator, and the meter connected to the output of the time interval generator, and the other to the output of the divider, and a control key, characterized in that, in order to increase the reliability of the tape marking in the recording conditions of the false signals on the tape First and second generators of marker pulses, discriminator of marker pulses, blanking generator, second and third And elements, and code comparison node, some inputs of which are connected to the code master, others - to the output of the counter, and the output of the comparison node are connected to the second inputs of the first and second elements And, while the output of the third element And is connected to the input of the divider, the input of the first generator of marker pulses, the first input of the second element And the third input of the first element a AND is connected to the control key, the output of the second element AND is connected to the input of the second generator of marker pulses and to the input of the generator of the blanking pulse, the output of which is connected to the first input of the third element And, the second and third inputs of the third element And are connected respectively to the output of the playback unit and the output of the differences of the marker pulses, and the two inputs of the latter are connected respectively to the output of the playback unit and to the outputs of the time interval generator. Reference pulses FIG. 2 Marker pulses