KR100186417B1 - A starting part reproducing device of a vcr - Google Patents

Abstract

TECHNICAL FIELD The present invention relates to an apparatus for regenerating V-Cal, and more particularly, to an apparatus for regenerating V-Cal to prevent signal loss from occurring at the beginning of the regeneration phase due to the physical and electrical characteristics of the twin head. However, the conventional technology of the luminance reproducing system is effective in enhancing the contour of the reproduced signal, but the implementation of the low and high frequency characteristics is accompanied by a configuration problem. When the electrical characteristics are matched, high fidelity reproduction fidelity can be expected. However, since recording standards are different from those of a general head reproducing apparatus, there is a problem of reproduction compatibility.

Therefore, in the present invention, the track data is read by the two heads having different characteristics per channel of the drum, that is, the twin heads, to match the frequency characteristics at the time of reproduction, and the delay component caused by the mechanical position difference of the heads is corrected. In addition, one purpose is to enable high quality recording and reproduction by adding a head coil having another winding number in addition to the existing head coil of the head.

Description

VRT's ultra-short playback device.

Fig. 1 is a block diagram of a general V's ultra short playback device.

2 is a block diagram of an ultra-short playback apparatus using a general super head.

3 is an output waveform diagram of each part of FIG.

4 is a block diagram showing the ultra-short playback device of the present invention VRC.

5 is a block diagram showing the ultra-short recording apparatus of the VR of the present invention.

6 shows the position of the twin head and thus the delay time.

Figure 7 shows the head-to-head switching pulse and delay pulse of the twin head.

8 shows a channel read by an inter-head switching pulse and the resulting RF signal.

9 is a view showing the reproduction characteristics of the general head and the reproduction characteristics according to the present invention.

10 is a view showing another embodiment of the present invention by a rotary transformer wiring method.

* Explanation of symbols for the main parts of the drawings

201: first amplification transmitter 202: second amplification transmitter

203: switching control unit 204: microcomputer

205: first filter 206: second filter

207: delay unit 208: first signal correction

209: second signal correction 210: mixing unit

TECHNICAL FIELD The present invention relates to an apparatus for regenerating V-Cal, and more particularly, to an apparatus for regenerating V-Cal which prevents signal loss from occurring at the beginning of the regeneration phase due to physical and electrical characteristics of the twin head. .

FIG. 1 is a block diagram of a general V1 ultra-short reproducing apparatus, in which RF signals read by the heads 100 and 101 are frequency-converted by the RF transmission units 102 and 103, by the mixer 104. The mixed FM signal as shown in FIG. 3B is input to the delay unit 105 and the diode switch unit 106.

The delay unit 105 delays the input FM signal for a predetermined time, and the diode switch unit 106 converts the FM signal and outputs the signal as shown in FIG.

In this case, the point where the output signal of the diode switch 106 is converted from (+) to (-), or (-) to (+) is a portion that is likely to cause a defect due to the characteristics of the luminance FM signal. In order to prevent the zero crossing phenomenon and the edge noise as shown in FIG. 3 (d) by mixing the output of the delay unit 105 and the mixing unit 107 and outputting the signal to the signal processing system, This increases the reproduction fidelity of the signal.

On the other hand, the ultra-short playback apparatus by the general super head uses the super heads 110 and 111, which improve the electrical characteristics of the existing head, as shown in FIG. The modulation band and color conversion band of the FM signal to be recorded are different so that the high density magnetized tape can be coped with.

By the way, the above description of the luminance reproducing system is effective in the enhancement of the contour of the reproduced signal, but the configuration of the low and high frequency characteristics is accompanied by a configuration problem. When the electrical characteristics of the and heads match, high fidelity reproduction fidelity can be expected. However, since the recording standard is different from that of a general head reproducing apparatus, there is a problem of reproduction compatibility.

Therefore, in view of the above problems, the present invention reads out the data of the track to match the frequency characteristics by two heads, that is, twin heads, having different characteristics per channel of the drum during reproduction. The purpose of this invention is to enable high-quality recording and reproduction by correcting the delay component that occurs, and the present invention having such a purpose will be described in detail.

In order to achieve the above object, the VSR ultra-short playback apparatus of the present invention has two heads for each channel CH1 and CH2, as shown in FIG. 4, and reads data from the tape with different characteristics. The data read from the twin heads H1 and L1 (H2 and L2) and the twin heads H1 and L1 (H2 and L2) are input and amplified by a predetermined level, respectively, and then each channel CH1 ( First and second amplification transmitters 201 and 202 for selectively outputting data of CH2) and head switching accordingly to the first and second amplification transmitters 201 and 202 under the control of the microcomputer 204. A switching controller 203 for outputting a pulse, first and second filters 205 and 206 for filtering the outputs of the first and second amplifying transmitters 201 and 202 according to a given frequency characteristic, respectively, During the difference time according to the mechanical position of the twin head (H1, L1) by receiving the output of the first filter 205 It is received the output of the delay unit 207 and output to the second filter 206 of the delay unit 207 to open a balanced mix it will be composed of the mixing portion 210, to step the output signal processing.

On the other hand, the mechanical composition position of the twin head (H1, L1) (H2, L2) is composed of a + -shaped and other angles in which the head is mounted to the drum in pairs having different characteristics of each frequency.

The operation and effects of the present invention configured as described above will be described in detail with reference to FIGS. 4 to 9.

First, the ultra-short playback device will be described.

The mechanical composition positions of the twin heads H1, L1 (H2, L2) in accordance with the channels CH1, CH2 are divided by the same azimuth angle as shown in FIG. It is configured to be read, and the twin heads H1 and L1 (H2 and L2) of the channels CH1 and CH2 have different electrical characteristics.

Therefore, the head switching pulse shown in FIG. 8 (a) is applied from the twin heads H1, L1 (H2, L2) of each channel CH1, CH2 to read the data of the tracks tr1, tr2. At this time, the recording magnetization pattern on the tape is traced by the twin heads H1 and L1 of the channel CH1 so that the data of the track tr1 can be read by the same edge musculus angle. Similarly, the twin heads H2 and L2 of CH2 can read the track tr2 continuously with the track tr1.

As a result, the RF signal is read from the track on the tape as shown in FIG. 8 (b), and the RF signal is represented by each head of the twin heads H1 and L1 as shown in FIG. Depending on the mechanical composition position, a predetermined time delay occurs.

The electrical characteristics of the twin heads H1, L1 (H2, L2) for each channel CH1, CH2 make the transmission characteristics of the head H1 favorable to the low frequency characteristics, while the transmission characteristics of the head L1 are changed. Advantageous to the high frequency characteristics, data recorded on the tape is read for each frequency characteristic.

On the other hand, the delay caused by the mechanical positional difference between the twin heads H1 and L1 (H2 and L2) is shown in FIG. 7A as the twin heads H1 and H2 that trace the track of the tape first. The tracks are continuously read by the switching pulses as described above, and the twin heads L1 and L2 having different characteristics trace the tracks in the same way by the switching pulses shown in FIG. 7 (b). As shown in (c), a delay time Dt of each of the switching pulses is generated, and this delay time Dt is defined by the following equation (1).

Where Vh is the running speed of the tape and the relative speed of the head,

Δ1 is the mechanical distance between twin heads having different characteristics.

The data read by the heads H1 and H2 is applied to the amplifiers AMP1 and AMP2 of the amplifier 201 and amplified by a predetermined level. Similarly, the data read by the heads L1 and L2 is also amplified by the amplifier 202. Is applied to the amplifiers AMP3 and AMP4 and amplified by a predetermined level.

In addition, the microcomputer 204 controls the switching control unit 203 according to the characteristics of the RF signal to be read, and the switching control unit 203 controls the mechanical distance between the twin heads H1 and H2 (L1 and L2). Accordingly, by controlling the switches SW1 and SW2 of the amplifier 201, the traces of the continuous tracks are made.

The output of the switch SW1 is applied to the first filter 205 for low pass filtering according to the characteristics of the read signal, and the output of the switch SW2 is applied to the second filter 206 for band and high pass filtering. Will be done.

Thereafter, the output of the first filter 205 is applied to the delay unit 207 to be delayed for a delay for a time defined by Equation (1) so that the timing of the first filter 205 matches the signal passing through the second filter 206. The output of the first filter 205 is input to the color signal processing system to take advantage of the low frequency characteristic in consideration of the recorded color frequency band.

The timing signal is input to the signal correction unit (208, 209), the level of the signal is adjusted by the auto gain control (Auto Gain Control), the correction of the giga RF signal is made to the mixing unit 201 By inputting and mixing appropriately, the signal (shown in FIG. 9 (c)) having a balance between the low pass shown in FIG. 9 (b) and the high pass shown in (c) is transmitted to the signal processing system.

As a result, the reproduction characteristics of the general head are improved in one of the bands as shown in Fig. 9A, but in the present invention, the reproduction characteristics are improved in both the low frequency and high frequency characteristics.

Next, a description will be given of the first recording device of V-Cal with reference to FIG. 5 to filter and amplify the transmission characteristics such that the signals modulated by the FM signals are matched to the characteristics of each head through the filters 301 and 302. The units 303 and 304 receive the outputs of the filters 301 and 302 and amplify them with a predetermined gain suitable for the head characteristics. The amplified signals are applied to the transmitters 305 and 306 to the twin head. It is recorded on tape by being transmitted.

FIG. 10 is a diagram showing another embodiment of the present invention according to the rotary transformer wiring method. FIG. 11 is a wiring diagram illustrating the rotary transformer of FIG. 10, and as shown therein, the head 401 of each channel CH1. In addition to one head coil 402, a head coil 403 having a different number of turns is added to have different characteristics, and the number of turns ratio of the rotary transformers 404 and 405 connected to the head coils 402 and 403, respectively. By varying (), the output characteristics of the same head are transmitted so that two different sound response characteristics are transmitted.

If the first rotary transformer 404 is advantageous for the high frequency characteristic and the second rotary transformer 405 is advantageous for the low frequency characteristic as shown in the wiring diagram shown in FIG. 11, the first amplifier 406 ) And the second amplifier 407, the output signal of the high and mid-range different characteristics are output and synthesized in the first mixing unit 408 will have a frequency response characteristic that can eventually implement a high quality, the channel (CH2) The operation process for the same operation as above.

Therefore, the outputs of the first mixing section 408 and the second mixing section 416 are inputted to the switching section SW, switched by the head switching pulse HPS, synthesized into continuous RF signals along the time axis, and then fed into the signal processing system. Will be sent.

As described above, the present invention can add high-fidelity tapes with low noise and tapes with poor recording characteristics by adding a head coil having another winding number in addition to the existing head coils or the mechanical composition of the twin heads. By improving both the brightness and the color characteristics, better image quality can be reproduced, and double-depth recording is possible even during recording.

Claims (3)

Twin heads H1, L1 (H2, L2) having two heads for each channel CH1 (CH2) and reading data from a tape with different characteristics, and the twin heads H1, L1 (H2, First and second amplification transmitters 201 and 202 for receiving data read from L2 and amplifying the data at predetermined levels, and selectively outputting data of channels CH1 and CH2 by a head switching pulse; A switching controller 203 for outputting a head switching pulse to the first and second amplification transmitters 201 and 202 under the control of 204, and the first and second amplification transmitters 201 and 202. The first and second filters 205 and 206 for filtering the output of the signal according to the given frequency characteristics, respectively, and the output of the first filter 205 is applied according to the mechanical positions of the twin heads H1 and L1. The delay unit 207 for delaying the difference time, the output of the delay unit 207 and the output of the second filter 206 is applied and balanced To mixed signal processing to step output the first stage of reproducing apparatus, it characterized in that the V CR and composed of the mixing portion 210. The mechanical composition position of the twin heads H1, L1 (H2, L2) is characterized in that the heads having different characteristics of each frequency are mounted to the drum in pairs to form a + shape and other angles. Ultra-short reproducing apparatus made of VR. In addition to the head coils 402 and 410 of the heads 401 and 409 of each channel CH1 and CH2, head coils 403 and 411 having different winding numbers are added to have different characteristics. By varying the number of turns of the rotary transformers 404, 405, 412, 413 connected to the head coils 402, 403, 409, 411, the output characteristics of the same head are transmitted so that two different response characteristics are transmitted. A VSR ultra short playback device characterized in that the configuration.