KR0132825B1 - Multi-channel record/replay system having channel a special recompense - Google Patents

Abstract

Multichannel recordng/replaying system having the channel character compensation function, where compensates the wrong image and sound that are generated according to differing the channels character, because of compensating the character difference of the channels previously and high frequency character.

Description

Multichannel recording and playback system with channel characteristic compensation

1 is a block diagram according to an embodiment of a multi-channel recording and reproducing system according to the present invention.

FIG. 2 is a detailed circuit diagram according to the first embodiment of the record equalizer in FIG.

3 is a detailed circuit diagram according to the second embodiment of the record equalizer in FIG.

4 shows the structure of a disk-shaped rotary transformer in FIG.

5A-5D are waveform diagrams for comparing the conventional recording / reproducing system with the recording / reproducing system according to the present invention.

* Explanation of symbols for the main parts of the drawings.

31: channel encoder 32: record equalizer

33: recording amplifier 34: recording / playback head switching unit

35 magnetic channel 36 reproduction amplifier

37: Playback equalizer 38: Channel decoder

42: recording / playback switch 43: head switch

51, 61: buffer 52: attenuator

53, 65: first switch 54, 62: voltage regulator

55, 63, 64: delay unit 56, 66: second switch

57, 67: Amplifier

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multichannel recording and reproducing system, and more particularly to a multichannel recording and reproducing system having a channel characteristic compensation function for compensating a characteristic difference between channels caused by the physical structure of a rotary transformer in a disk-shaped rotating drum. .

Generally, in recording and reproducing video or audio data, these data are recorded on a recording medium such as magnetic tape or magnetic disk in the form of digital signals, and the recorded data is reproduced to restore the original video and audio. As described above, in recording and reproducing data on a predetermined recording medium, efforts have been made to increase the amount of data to be recorded on a limited-size medium and to obtain better image quality and sound quality without deterioration of image quality or sound quality during reproduction. have.

Most electrical and electronic products are mass-produced, so even if they use the same type of head, recording media, or system, their performance cannot be the same. In addition, since users use recording media of different materials, it is difficult to record data at an optimal density during recording, and it is difficult to optimally reproduce recorded data even during playback. As a result, deterioration of image quality and sound quality may occur.

1 is a schematic block diagram of a general recording and reproducing system, in which a recording system modulates data to be recorded in a channel encoder 11 according to channel characteristics, corrects recording data in a recording equalizer 12, and then records a recording amplifier. Amplified to a predetermined level at (13) and recorded in the magnetic channel (14).

The reproducing system amplifies the signal reproduced from the magnetic channel 14 to a predetermined level in the reproducing amplifier 15, corrects the amplitude and phase of the amplified signal in the reproducing equalizer 16, and then Demodulate to original signal.

Each of the functional blocks of the recording and reproducing system shown in FIG. 1 has a fixed characteristic, and therefore, it is necessary to compromise and compensate for the characteristics of each channel, thereby failing to provide an optimum image quality and sound quality.

Designed to solve the problems of the recording / reproducing system shown in FIG. 1, recording equalizers 22 and 23, recording amplifiers 24 and 25, and playback amplifiers 26 and 27 suitable for the characteristics of each channel are reproduced. Equalizers 28 and 29 are used.

However, in such a case, in a recording and reproducing system having a large number of channels, a separate recording equalizer, a recording amplifier, a reproducing amplifier, and a reproducing equalizer have to be provided for each channel, thereby increasing the power loss and the circuit complexity.

Accordingly, an object of the present invention is to provide a multi-channel recording and reproducing system having a channel characteristic compensation function for matching the characteristics of each channel in order to solve the above problems.

In order to achieve the above object, a multi-channel recording and reproducing system having a channel characteristic compensation function according to the present invention provides a channel encoder for encoding a signal to be recorded according to the characteristics of each channel, and a high frequency characteristic of an output signal of the channel encoder. A recording equalizer for compensating for a characteristic difference between the respective channels occurring during reproduction at the same time as compensation, and for amplifying the output signal of the recording equalizer to a first predetermined level suitable for recording on the recording medium by a recording head; A recording amplifier, a reproduction amplifier for amplifying a reproduction signal read out from the recording medium through a reproduction head to a second predetermined level, a reproduction equalizer for compensating high frequency characteristics of the signal output from the reproduction amplifier, and the reproduction equalizer To the channel decoder and head switching pulse to decode the output signal of Switched by, the recording mode is connected to the recording amplifier and the recording head, and in the playback mode, characterized in that it comprises a recording / playback head switching unit for connecting the playback head and the playback amplifier.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram according to an embodiment of a multi-channel recording and reproducing system according to the present invention. The channel encoder 31, the recording equalizer 32, the recording amplifier 33, and the recording / reproducing head switching unit 34 are shown in FIG. And a magnetic channel 35, a reproduction amplifier 36, a reproduction equalizer 37 and a channel decoder 38.

FIG. 2 is a detailed circuit diagram according to the first embodiment of the recording equalizer 32 in FIG. 1, which includes an attenuator 41, a first switch 52, a buffer 53, a voltage regulator 54, and a retarder. 55, the second switch 56, the amplifier 57, and the recording equalizer adjusting unit 59. As shown in FIG.

Here, the attenuator 52 is composed of resistors R1, R2, the buffer 53 is composed of a plurality of resistors R3, R4, R5 and transistors Q1, and the voltage regulator 54 is a plurality of resistors. (R6, R7, R8).

4 is a detailed circuit diagram according to the second embodiment of the recording equalizer in FIG. 1, which includes a buffer 61, a resistor R4 as an attenuator, a voltage regulator 62, and first and second delays 63 and 54. FIG. ), First and second switches 65 and 66, an amplifier 67, and a recording equalizer adjusting unit 69.

Here, the buffer 61 is composed of a plurality of resistors R1, R2, R3 and transistors Q1, and the voltage regulator 62 is composed of a plurality of resistors R5, R6, R7.

FIG. 7 shows the structure of a disk-shaped rotary transformer in FIG.

5a to 5d are waveform diagrams for comparing the conventional recording and reproducing system with the recording and reproducing system according to the present invention. FIG. 5a is a characteristic graph of the reproducing system when no recording equalizer is used. The resonance frequencies of the A and B channels are different from each other due to the characteristics of the loss) and the resonance characteristics of the head, rotary transformer, and amplifier.

On the other hand, Figure 5b is a graph of the output characteristics of the reproduction signal when the signal recorded using the recording equalizer shown in Figure 2 is reproduced, Figure 5c is a signal recorded using the recording equalizer shown in Figure 3 In the case of reproduction, this is a graph of the output characteristics of the reproduction signal.

The operation of the present invention will now be described with reference to FIGS. 5 to 5a-5c.

First, referring to FIG. 1, data to be recorded is encoded through a channel encoder 31 according to the characteristics of a channel, and then a recording or the like is performed to compensate for a high frequency characteristic of the channel and a characteristic difference of each channel. It is applied to the firearm (32). The output signal of the recording equalizer 32 is amplified by the recording amplifier 33 and then recorded in the magnetic channel 35 by the recording head switched by the recording / reproducing head switching section 34.

On the other hand, the data recorded in the magnetic channel 35 is read through the reproduction head switched by the recording / reproduction head switching section 34, and then amplified by the reproduction amplifier 36. The output signal of the reproduction amplifier 36 is decoded by the channel decoder 38 and output after the characteristic is compensated for in the reproduction equalizer 37. Since the reproduction equalizer 37 does not have to compensate for the characteristic difference between the respective channels, the internal circuit is simpler than the recording equalizer 32.

In more detail with respect to the recording / playback head switching section 34, the recording / playback head switching section 34 is used in a conventional recording / reproducing apparatus, and first recording / reproducing switching is performed by the recording amplifier 33 during recording. The output of must be switched so that it is connected to the channel. In addition, the headswitching recorder of FIG. 2 and FIG. 3 switches so that when there are two channels, each channel is selected so that the channel is selected at the time of recording and playback. That is, the recording / reproducing switch 42 connects the recording amplifier 41 and the magnetic channel when the recording / reproducing switching pulse is 'high' logic state (H), that is, in the recording mode. In the case of the 'low' logic state (L), that is, during playback, the playback amplifier 48 is connected to the magnetic channel.

On the other hand, the head switch 43 is a rotary transformer 44 in which the system and the A head are connected when the head switching pulse is 'high' logic state (H), that is, when the A head 45 is connected to the magnetic channel. If the head switching pulse is 'low' logic (L), that is, when the B head 46 is connected to the magnetic channel, the system and the rotary transformer 47 is connected to the B head.

Typically, these two switches occur at the system controller (not shown). The recording equalizer 32 is adjusted by these switching pulse signals.

The record equalizer 32 will be described in more detail with reference to FIGS. 5 and 6 as follows.

First, referring to FIG. 2, when the head switching pulse generated from the recording equalizer adjusting unit 59 is in the 'high' logic state (H), the first switch 52 is connected to the contact 'H', so that the channel encoder The data encoded in (31 in FIG. 1) is attenuated through the resistor R1 in the attenuator 51, and then passed through the buffer 53, when the head switching pulse is in the 'low' logic state (L). Since the one switch 52 is connected to the contact 'H', the data encoded by the channel encoder (31 in FIG. 1) passes through the buffer 51 without being attenuated by the attenuator 51.

When the output signal of the buffer 53, that is, the output signal at the X contact is E · e ^jwt , when the head switching pulse is in the 'high' logic state, the second switch 56 is connected to the 'H' contact so that the amplifier 57 Signal of the inverting input terminal

When the head switching pulse is 'low' logic state, since the second switch 56 is connected to the 'L' contact, the signal of the inverting input terminal of the amplifier 57 is

In each case, the signal of the non-inverting input terminal of the amplifier 57 is

Becomes Τ is the delay amount of the delay unit 55.

When the recorded signal is reproduced using the recording equalizer (32 in FIG. 1) shown in FIG. 2, the output characteristic graph of the reproduced signal is shown in FIG. 5B, and the compensation amount of the high frequency and the gain of the entire frequency band are shown. By varying the adjustment for each channel, frequency characteristics can be matched within the frequency band used.

Next, since the main signal flow of the record equalizer shown in FIG. 6 is the same as in FIG. 5, it will be omitted.

In FIG. 3, when the signal at the input terminals of the first delay unit 63 and the second delay unit 64 is E · e ^jwt , the head switching pulse generated by the recording equalizer adjusting unit 69 is 'high'. In the logical state (H), since the first switch 65 and the second switch 66 are connected to the 'H' contact, the signal of the inverting input terminal of the amplifier 67

The signal of the non-inverting input terminal is

Becomes

On the other hand, when the head switching pulse is 'low' logic state, since the first switch 65 and the second switch 66 are connected to the 'L' contact, the signal of the inverting input terminal of the amplifier 67

The signal of the non-inverting input terminal is

Becomes Τ ₁ and τ ₂ are delay amounts of the first delay unit 63 and the second delay unit 64, respectively.

When the recorded signal is reproduced using the recording equalizer 32 of FIG. 3, the output characteristic graph of the reproduced signal is shown in FIG. 5C, and the first delay unit 63 The delay amounts τ ₁ and τ ₂ of the second delay unit 64 may be adjusted to match the reproduction frequency characteristics of the respective channels not only in the frequency band but also outside the frequency band.

In the case where the delay time of the first delay unit 63 is shorter than the delay time of the second delay unit 64, the record equalizer adjusting unit 69 has a channel characteristic such that the resonance frequency of the channel A is equal to that of channel 5a. If the resonant frequency is higher than the resonant frequency of the A channel recording H, when the B channel recording L of the head switching signal is output, and as shown in the characteristic of the channel 5d channel A is lower than the resonant frequency of the channel B channel A channel L at the time of recording and the head switching signal of H at the time of B channel recording are output. On the contrary, when the delay time of the first delay unit 63 is longer than the delay time of the second delay unit 64, the record equalizer adjusting unit 69 has a characteristic of the channel as shown in FIG. When the channel B is higher than the resonance frequency of the B channel, L outputs the head switching signal of the channel H, and when the channel B is recorded, the channel characteristic is lower than the resonance frequency of the B channel as shown in FIG. H at the A-channel recording and L head switching signal at the B-channel recording are output.

As described above, in the multi-channel recording / reproducing system having the channel characteristic compensation function according to the present invention, the characteristics of each channel are different by compensating for the high frequency characteristic in the recorder and compensating the characteristic difference between the channels generated during playback in advance. It is not only possible to compensate for the deterioration of the image quality and sound quality that occur, and there is an advantage that the circuit can be simplified because it is not necessary to compensate for the characteristic difference between channels in the reproduction system.

Claims (6)

A channel encoder for encoding a signal to be recorded in accordance with the characteristics of each channel, a recording equalizer for compensating for a characteristic difference between channels in advance during compensation, while compensating for high frequency characteristics of an output signal of the channel encoder, And a recording amplifier for amplifying the output signal of the recording equalizer to a first predetermined level suitable for recording on the recording medium by a recording head. The method of claim 1, wherein the recording equalizer comprises: a first switch for attenuating and outputting the output signal of the channel encoder to different degrees according to the logic of the head switching pulse, a buffer for buffering the output signal of the first switch, A delay for delaying the output signal of the buffer for a predetermined time, and a second switch and a non-inverting input terminal for attenuating and outputting the output signal of the buffer to different degrees according to the logic of the head switching pulse. And an amplifier configured to apply an output signal of the second switch to the inverting input terminal, amplify the difference, and output the amplified difference to the recording amplifier. 3. The recording equalizer of claim 2, wherein the recording equalizer varies the attenuation degree of the first switch and the second switch so as to adjust the frequency characteristics within the frequency band used by varying the compensation amount of the high frequency and the gain adjustment of the entire frequency band for each channel. A multichannel recording and reproducing system having a channel characteristic compensation function, characterized in that the matching is performed. The buffer of claim 1, wherein the write equalizer comprises: a buffer for buffering an output signal of the channel encoder, first and second delayers for delaying the output signal of the buffer for a first and a second predetermined time, respectively, the buffer; A first switch for attenuating and outputting the output signal at different degrees according to the logic of the head switching pulse, a second switch for switching the output signals of the first and second delay units according to the logic of the head switching pulse and outputting the same; And a non-inverting input terminal having an output signal of the second switch and an inverting input terminal applying an output signal of the first switch to amplify the difference and output the amplifier to the recording amplifier. Multi-channel recording and playback system with a function. 5. The multi channel having a channel characteristic compensation function according to claim 4, wherein the recording equalizer adjusts the frequency to be emphasized for each channel by adjusting the delay times of the first delay unit and the second delay unit during recording. Record playback system. 6. The channel switching compensation function as claimed in claim 5, wherein the head switching signal of the channel recording is generated by varying the frequency to be emphasized according to the adjustment of the delay time of the first delay and the delay time of the second delay. Multichannel recording and playback system.