KR970006829B1 - Digital/ analog video signal recording/reproducing apparatus - Google Patents

Abstract

By the choice of an user, whether analog signal should be recorded or digital signal recorded is decided, in case that means of control(9) which received the order of the user records the digital signal, controls digital analog input selection means(1), and converts into digital signal. Digital signal selected at the digital analog input selection means(1) is inputted into the digital recording signal processing means(2), and by the digital recording signal processing means(2), equalizes and amplifies the digital signal to output. Then, after being inputted into the digital head switching means(3), receiving the control of the control means(9) and switching the digital heads(HD1, 2, 3, 4) on the head drum(14), records the digital signal on the video tape.

Description

Digital analog video recording / playback device

1 is a block diagram of a recording apparatus in the digital analog video recording / reproducing apparatus of the present invention.

2 is a block diagram of a playback device in the digital analog video recording / playback device according to the present invention;

3 is a diagram showing the configuration of a head drum in the video recording / reproducing apparatus of the present invention.

Figure 4 shows the phase angle and step of each head in the head drum of the present invention.

5 is a diagram showing a track pattern at the time of recording a double signal according to the present invention.

6 is a diagram showing timing of a head switching signal in the apparatus of the present invention.

* Explanation of symbols for main parts of the drawings

1: digital analog input selection means 2: digital recording signal processing means

3: digital head switching means 4: analog recording signal processing means

5 analog head switching means 6 analog input switching means

7: analog recording signal processing means 8: recording head switching means

9 control means 14 head drum

HD1-HD4: Digital Head HA1, HA2: Analog Head

17 digital head switching means 18 digital reproduction signal processing means

19: analog head switching means 20: analog reproduction signal processing means

21: digital analog output selection means 24: analog output switching means

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital analog video recording / reproducing apparatus capable of performing a combination of digital signal recording and reproducing of a high definition television (HDTV) signal and analog signal recording and reproducing of a conventional VHS signal. The present invention relates to a video recording / reproducing apparatus capable of simultaneously recording a video signal or reproducing a video signal recorded simultaneously.

In the conventional video signal recording and reproducing apparatus, a device for recording and reproducing HDTV digital signals and a device for recording and reproducing VHS analog signals are provided as separate products due to differences in signal processing between the two systems. Since HDTV signals cannot be recorded / reproduced on a general VHS tape, there is a problem in that the two systems lack compatibility.

That is, in the case of digital recording and reproducing, when recording and reproducing with one head (one channel recording and reproducing), the recording and reproducing frequency band that the head must bear is about 15 MHz for 30 Mbps digital data. In addition, the relative speed of the tape and the head drum also requires 10m / sec or more, there is a problem that the difficulty in driving control.

In addition, such a system for recording and reproducing a digital video signal (in some cases, a digital signal including an audio signal) is not compatible with a VHS video recording / reproducing apparatus for recording and reproducing analog video signals. have.

For example, in the conventional VHS system VCR, there are an SP mode and an EP mode. The pitch of a video track in the SP mode is 58 占 퐉, and the track pitch of the EP mode is standardized to 19 占 퐉.

However, since the VCR must be able to record and play back in both the SP mode and the EP mode, the track width of the head is generally no more than twice the track pitch of the EP mode, which means that the track width of the head is more than twice the track pitch. This is because tracks having the same AZIMUTH are simultaneously detected and cannot be used as signals.

Therefore, in the conventional VHS VCR, in consideration of these advantages, the head width is about 30 μm, and the head used in this case is commonly referred to as an SP / EP head.

When recording the video signal by the SP / EP common head in the SP mode, a guard band of about 28 占 퐉 is formed between the video track and the track, causing waste of the tape.

However, when recording in the EP mode, when a head having a width of 30 탆 is used, the tracks are over-wraped without the guard band described above and recorded at a constant track pitch of 19 탆.

However, in general users, except for the purpose of prolonging the recording time, the use of the EP mode in which the image quality is relatively lowered and the SP mode is preferred.

The reason for this is that the wider the track width, the more the head output increases and the S / N ratio is improved. Also, in the current VHS method, the digital and analog signals can be simultaneously recorded and reproduced, or different heterogeneous analog signals can be simultaneously recorded and reproduced. In order to record two video signals on videotape, it is only possible to record with time difference or to record two video signals using two VCRs divided into two tapes. If you want to play another program while watching another program, you may need to control the tape for FF / REW driving (when recorded with the same time difference on the same tape), or find and play back a tape on which another video is recorded. Hamm followed.

Accordingly, the present invention provides a digital recording / reproducing head and an analog recording / reproducing head in a head drum to switch and signal digital signals and analog signals to respective recording and reproducing systems, and to record and reproduce digital signals and analog signals, respectively. A digital analog video recording / reproducing apparatus for selectively recording and reproducing HDTV digital signals and VHS analog signals on VHS tapes by executing tape running and head drum rotation control at an appropriate speed for each signal processing system. It is intended to provide.

In addition, the present invention not only records and reproduces digital or analog video signals as described above, but also records or reproduces the first video signal with an analog head for two types of analog video signals, and the second video signal. An object of the present invention is to provide a digital analog video recording / reproducing apparatus capable of recording and reproducing on the same tape using a digital head.

In addition, in the present invention, when recording and reproducing two different signals on the same tape multiplely as described above, the digital analog recording allows the first video signal to be recorded and the second video signal can be simultaneously reproduced. An object of the present invention is to provide a combined video recording / reproducing apparatus.

1 shows a circuit configuration of a recording apparatus in a digital analog video recording / reproducing apparatus of the present invention for achieving the above object. Referring to this, the present invention relates to a digital analog for selecting a digital signal and an analog signal to be recorded. In the input selecting means 1, the digital recording signal processing means 2 for appropriately processing the digital signal selected by the digital analog input selecting means 1 in the recording format, and in the digital recording signal processing means 2, The digital head switching means 3 for switching the output signal and supplying it to the digital heads HD1 and HD2 (HD3 and HD4) and the analog signal selected by the digital analog input selection means 1 as appropriate for the recording format. The analog record signal processing means 4 for processing and the signal output from the analog record signal processing means 4 are switched to analog head HA1. Analog head switching means 5 for supplying to HA2, digital heads HD1, HD (HD3, H D4) which are switched by the digital head switching means 3 to record and reproduce digital signals, and An analog head (HA1) (HA2) switched by the analog head switching means (5) for recording and reproducing analog signals, an analog input switching means (6) for selecting whether or not to record a second analog input signal, and An analog recording signal processing means 7 for appropriately processing a signal output from the analog input switching means 6 in a recording format, and a signal output from the analog recording signal processing means 7 for switching the digital head ( Recording head switching means 8 for supplying HD1) to HD4; the digital analog input selecting means 1, the digital head switching means 3, the analog head switching means 5, and the analog input switching means 6; , A control means 9 for switching and controlling the lockhead switching means 8, a tension driver 10 operating under the control of the control means 9, and a tension motor driven by the tension driver 10 11), a post 12 which is operated by the tension motor 11 to adjust the tension of the video tape, and a drum motor 13 which drives the head drum 14 under the control of the control means 9; And a head drum 14 provided with the heads HD1-HD4 (HA1, HA2) and performing a helical scan of a video tape by driving the drum motor 13, and of the control means 9; The capstan motor 15 which drives a capstan under control, and the capstan 16 which drives a video tape by the said capstan motor 15 are comprised.

2 shows a configuration of a playback apparatus in the digital analog video recording / reproducing apparatus of the present invention. Referring to the drawing, the digital signals reproduced by the digital heads HD1 and HD2 HD3 and HD4 are switched to output the same. In the digital head switching means 17, the digital reproduction signal processing means 18 for appropriately processing the signal output from the digital head switching means 17 to the reproduction format, and the analog heads HA1 and HA2. An analog head switching means 19 for switching and outputting the reproduced analog signal and an analog reproduction signal processing means 20 for signal processing the signal output from the analog head switching means 19 according to a reproduction format. Digital analog output selecting means (21) for selecting, reproduction head switching means (22) for selecting a second analog recording signal reproduced in said digital head (HD1) (HD2), Analog reproduction signal processing means 23 for signal processing the signal output from the reproduction head switching means 22 appropriately for the reproduction format, and analog output switching means for selecting whether to output the analog reproduction signal processing means 23 or not. 24, an audio / control head 25 for recording and reproducing an audio signal and a control signal on a video tape, an output of the digital reproduction signal processing means 18 and an output of the analog reproduction signal processing means 20. Comparing means 26 for supplying to the control means 9 in comparison with the control signal of the audio / control head 25.

On the other hand, the analog head and the digital head are mounted on the head drum 14 as shown in FIG. 3, and the configuration thereof shows that the digital heads HD1 and HD2 (HD3 and HD4) respectively have two sets of heads. The pair is composed of a double azimuth, and the analog heads HA1 and HA2 are arranged to have a phase angle of θ with the double azimuth head.

And the tape 27 is formed to have a winding angle of 180 degrees or more on the drum by guide rollers 28A, 28D and inclined posts 28C, 28B, respectively, in front of and behind the traveling system of the head drum 14. The head drum 14 is rotationally driven at a speed of 3600 rpm or 1600 rpm during recording and reproducing, and at a speed of 1800 rpm for recording and reproducing analog signals.

Referring to FIG. 4, the phase angles and the steps of the respective heads are digital heads HD1 and HD2 (HD3 and HD4), and the azimuth angles are ± θ1 and analog heads HA1 and HA2, respectively. The mute angles are each configured as ± θ2, the digital heads HD2 and HD4 each have a height difference of step %% 1 relative to the heads HD1 and HD3, and the analog heads HA1 and HA2 are digital. Each of the heads HD2 and HD4 has a height difference equal to the step δ2.

In addition, the digital heads HD1 and HD2 (HD3 and HD4) have a phase difference of Δθ, respectively, and the digital heads HD1 and HD3 (HD2 and HD4) and the analog heads HA1 and HA2 are 180 degrees of opposing angles, respectively. Have

Therefore, when the drum 14 is rotated, the heads are arranged in the order of HD1 → HD2 → HA1 → HD3 → HD4 → HA2 → HD1. In the case of digital recording and playback, a pair of double azimuth heads HD1 and HD2 are provided. At the same time, the recording signal is applied or reproduced, and the recording signals are also simultaneously applied or reproduced to the heads HD3 and HD4 contacting the tape 180 degrees after the head switching signal is received.

In the present invention, the analog heads HA1 and HA2 have an azimuth angle of ± 6 degrees to record and reproduce the existing VHS signals, and the digital heads HD1 and HD2 (HD3 and HD4) for compatible playback of the VHS tape. Has azimuth angles of ± 15 degrees each to record and reproduce digital signals such as high-definition television (HDTV).

The head drum 14 is equipped with a phase generator (PG) to switch each switching means based on the detection signal of the phase generator (PG).

The signal recording and reproducing operation by the digital analog video recording / reproducing apparatus of the present invention configured as described above will be described below with reference to FIGS. 1 and 3.

[Recording of digital signal]

The user's selection determines whether to record the analog signal SAi or the digital signal SDi. The control means 9 commanded by the user records the digital signal SDi when the digital signal SDi is recorded. The input selection means 1 is controlled to switch to the digital signal SDi side.

Under such control, the digital signal SDi selected by the digital analog input selecting means 1 is input to the digital recording signal processing means 2.

The digital recording signal processing means 2 is composed of a preamplifier, a modulator and an equalizer, and amplifies, modulates, equalizes and outputs the input digital signal SDi.

The signal processed by the digital recording signal processing means 2 is input to the digital head switching means 3, and the digital head switching means 3 is controlled by the control means 9, and the digital head on the head drum 14 is controlled. (HD1, HD2) (HD3, HD4) are switched to record the digital signal on the videotape.

[Analog signal recording]

When the analog signal SAi recording is selected by the user's selection, the control means 9 controls the digital analog input selection means 1 to switch to the analog signal SAi side.

Under such control, the analog signal SAi selected by the digital analog input selecting means 1 is input to the analog recording signal processing means 4.

The analog recording signal processing means 4 is composed of a preamplifier, a modulator and an equalizer, and amplifies and modulates the input analog signal SAi, and amplifies and outputs the same.

The signal processed by the analog recording signal processing means 4 is input to the analog head switching means 5, and the analog head switching means 4 is controlled by the control means 9, and the analog head on the head drum 14 is controlled. Switch (HA1) (HA2) to record the analog signal on the videotape.

[Multiple recording of analog signals]

When the analog signal SAi recording is selected by the user's selection and the simultaneous recording of the second analog signal SAi 'is also selected, the control means 9 controls the digital analog input selection means 1 to control the analog signal ( In addition to switching to SAi, the analog input switching means 6 is turned on.

Under this control, the analog signal SAi selected by the digital analog input selecting means 1 is input to the analog recording signal processing means 4 and signal processed as described above, and then through the analog head switching means 5, through the analog head. It is recorded by (HA1) (HA2).

The second analog signal SAi 'output from the analog input switching means 6 is input to the analog recording signal processing means 7.

The analog recording signal processing means 7 is composed of a preamplifier, a modulator and an equalizer, and amplifies, modulates, equalizes and outputs the input analog signal SAi '.

The signal processed by the analog recording signal processing means 7 is input to the recording head switching means 8, and the recording head switching means 8 is controlled by the control means 9, and the digital head on the head drum 14 is controlled. (HD1) (HD4) is switched to record analog signals on video tape.

That is, the first input signal SAi is recorded with the analog heads HA1 and HA2, and the second analog signal SAi 'is simultaneously recorded with the extra digital heads HD1 and HD4 in the remaining tracks. It is.

That is, as shown in FIG. 5, tracks B and B 'are formed using heads HD4 and HD1 in the guard band section between recording tracks A and A' of a single signal.

In this case, the tracks B and B 'have a track width of 28 µm or less, and a track is formed at an azimuth angle of ± 15 degrees, respectively. The analog head HA1 and the digital head HD4 have a phase difference of 120 degrees, and the digital head ( HD4) and the analog head HA2 have a phase difference of 60 degrees, and the analog head HA1 and the digital head HD1 have a phase difference of 120 degrees and are continuously recorded.

In this case, the first recording signal is recorded in the tracks A and A 'at an azimuth angle of ± 6 degrees, and the second recording signal is recorded in the tracks A and A' at an azimuth angle of ± 15 degrees.

This signal recording relationship is based on the mounting structure of each head on the head drum as shown in FIG.

[Playback of digital signal]

A description with reference to FIG. 2 and FIG.

The user's selection or control means 9 determines whether the signal recorded on the tape is an analog signal or a digital signal.

As an example of the signal discrimination by the control means 9, the comparison means 26 uses the period of the control pulse (CTL pulse) recorded on the tape from the audio / control head 25 to perform the digital reproduction signal processing means. The output signal of (18) or the output reproduction signal of the analog reproduction signal processing means 20 is compared with the CTL signal, and a comparison signal is supplied to the control means 9, and the control means 9 determines the input comparison signal. It is decided whether digital signal reproduction or analog signal reproduction.

In the case of reproducing the digital signal, the control means 9 switches the digital head switching means 17 to control switching and outputs the digital signal reproduced from the digital heads HD1 and HD2 HD3 and HD4. The signal is input to the digital reproduction signal processing means 18.

The digital reproduction signal processing means 18 processes and amplifies the input digital signal into a signal suitable for a display and supplies it to the digital analog output selection means 21.

The digital reproduction signal processing means 18 is composed of a preamplifier, a demodulator, and an equalizer, and amplifies and demodulates the reproduced digital signal in a very short time, and then outputs the equalized length.

Under the control of the control means 9, the digital analog output selection means 21 is switched to the digital reproduction signal processing means 18 side during digital signal reproduction to output the digital reproduction signal SDo.

[Analog signal playback]

In the reproducing mode of the analog signal, under the control of the control means 9, the analog head switching means 19 is switched to switch and output the reproducing analog signal of the analog heads HA1 and HA2, wherein the output analog signal is an analog reproduction. The signal processing means 20 processes and amplifies the signal appropriate for the display and is supplied to the digital analog output selection means 21.

The analog reproduced signal processing means 20 includes a preamplifier, a demodulator, and an equalizer, and amplifies and demodulates the reproduced analog signal SAi in a very short time, and outputs an equalized amplification.

In this manner, in the analog reproduction mode, the control means 9 switches the digital analog output selection means 21 to the analog reproduction signal processing means 20 to output the signal-processed analog reproduction signal SAo.

[Multiplay of Analog Signals]

In the multiple reproduction mode of the analog signal, the analog head switching means 19 is switched under the control of the control means 9 to switch and output the reproduced analog signal of the analog heads HA1 and HA2, wherein the output analog signal is As described above, the analog reproduction signal processing means 20 processes and amplifies the signal appropriate for the display and outputs it through the digital analog output selection means 21.

At the same time, the reproduction head switching means 22 is turned on under the control of the control means 9 so that the second analog signal SAi 'reproduced by the digital heads HD1 and HD4 is processed by the analog reproduction signal. The means 23 is inputted, and the analog reproduced signal processing means 23 is composed of a preamplifier, a demodulator, and an equalizer, which amplifies and demodulates the reproduced analog signal SAi 'in a very short time, and then outputs it by equalized amplification.

In this case, in the analog multiple reproduction mode, the analog output switching means 24 is turned on by the control means 9 to output the signal-processed analog reproduction signal SAo '.

In this case, the control means 9 may turn on either of the regeneration head switching means 22 and the analog head switching means 19 according to the user's selection, or may turn both of them into a dual output state. have.

[Playback recording at the same time]

According to the user's selection, the analog input switching means 6 is turned on in FIG. 1 to record the second analog signal SAi 'on the video tape using the digital heads HD1 and HD4 as described above. In addition, in FIG. 2, the analog head switching means 19 is operated to output analog signals reproduced from the analog heads HA1 and HA2 so that recording and reproduction on the tape can be simultaneously performed.

6 is a timing diagram showing the head switching relationship in the simultaneous recording of the multiple signals.

That is, the analog heads HA1 and HA2 have a dress difference of 180 degrees, and the head switching signal is reversed. When the switching signal HSW1 is high, the recording signal is applied to the analog head HA1, and the switching signal HSW2. When is high, the write signal is applied to the analog head HA2.

At this time, when another second signal is simultaneously recorded, the head switching signal HSW3 is activated as a high signal with a phase delay of 120 degrees with respect to the head switching signal HSW1, and another signal is applied to the digital head HD4. By applying a different signal to the digital head HD1 with a phase difference of 180 degrees with respect to the head switching signal HSW3 in the same manner, it is possible to perform appropriate head switching for each recording and reproducing mode as described above. will be.

As described above, when recording or reproducing a digital signal or recording or reproducing an analog signal, the control means 9 controls the capstan motor 15 to drive the capstan 16 at a constant speed so as to rotationally drive the head drum 14. The tension drive unit 10 drives the tension motor 11 to control the tension of the video tape 27 with the tension post 12.

As described above, according to the digital analog video recording / reproducing apparatus of the present invention, at the time of recording and reproducing the analog signal, another second signal is simultaneously recorded on the tape using a digital head which is not used, and the existing tape is recorded. It is effective to record and replay two signals at the same time that only one signal is recorded at a time.

This provides the advantage that users can record two different programs on one tape, select and enjoy different programs as needed, and play and record another signal on the tape while watching and playing the already recorded programs. It can be effective.

Claims (4)

Digital analog input selection means (1) for selecting a digital signal and an analog signal to be recorded, and digital recording signal processing means (2) for appropriately processing a digital signal selected by the digital analog input selection means (1) in a recording format. And digital head switching means 3 for switching the signal output from the digital recording signal processing means 2 and supplying it to the digital heads HD1 and HD2 (HD3 and HD4), and the digital analog input selection means 1. Analog recording signal processing means (4) for appropriately processing the analog signal selected in Fig. 8) in the recording format, and the signal output from the analog recording signal processing means (4) is switched and supplied to the analog head (HA1) HA2. An analog head switching means 5, digital heads HD1 and HD2 (HD3 and HD4) which are switched by the digital head switching means 3 to record and reproduce digital signals; An analog head HA1 HA2 switched by the analog head switching means 5 for recording and reproducing an analog signal, an analog input switching means 6 for selecting whether or not to record a second analog input signal; An analog recording signal processing means (7) for signal processing the signal output from the analog input switching means (6) appropriately for a recording format, and a signal output from the analog recording signal processing means (7) for switching the digital head; (1) recording head switching means (8) supplied to (HD1) (HD4), said digital analog input selection means (1), digital head switching means (3), analog head switching means (5), and analog input switching means (6). ), A control means 9 for switching the recording head switching means 8, a drum motor 13 for driving the head drum 14 under the control of the control means 9, and the head HD1-. Entering HD4) (HA1, HD2) A head drum 14 for performing a helical scan of a video tape by driving the drum motor 13, a capstan motor 15 for driving a capstan under the control of the control means 9, and The capstan 16 for driving the video tape by driving the capstan motor 15 and the digital head switching means 17 for switching and outputting the digital signals reproduced in the digital heads HD1 and HD2 HD3 and HD4. And digital reproduction signal processing means 18 for processing the signal output from the digital head switching means 17 appropriately for the reproduction format, and the analog signal reproduced from the analog heads HA1 and HA2. A digital for selecting an output of the analog head switching means 19 for outputting and the analog reproduction signal processing means 20 for signal-processing the signal output from the analog head switching means 19 according to a reproduction format. An analog output selection means 21, reproduction head switching means 22 for selecting a second analog recording signal reproduced by the digital head HD1 and HD2, and outputted from the reproduction head switching means 22; Digital analog video recording / consisting of analog reproduction signal processing means 23 for signal processing appropriately for a reproduction format and analog output switching means 24 for selecting whether to output the analog reproduction signal processing means 23 or not. Playback device. The digital analog combined video according to claim 1, wherein the sum of the head widths of the analog heads HA1 and HA2 and the head widths of the digital heads HD1 and HD4 are within a track pitch of 59 µm in the VHS method. Recording / playback device. The digital head (HD1, HD2) (HD3, HD4) is composed of a double azimuth with a pair of two heads, respectively, and the analog head (HA1), (HA2) is It is arranged to have a phase angle of θ with the double azimuth head, the azimuth angle of the digital head (HD1, HD2) (HD3, HD4) is ± θ1, respectively, the azimuth angle of the analog head (HA1) (H2) Each of them is configured as ± θ2, and the digital heads HD2 and HD4 have a height difference as much as step δ1 with respect to the heads HD1 and HD3, respectively, and the analog heads HA1 and HA2 are digital heads HD2 ( HD4) has a phase difference of Δθ, respectively, and the digital heads HD1 and HD3 (HD2 and HD4) and the analog heads HA1 and HA2 each have 180-degree opposing angles, and are compatible for compatible playback of VHS tapes. The analog heads HA1 and HA2 have an azimuth angle of ± 6 degrees to record and reproduce the existing VHS signal, and the digital heads HD1 and HE2 (HD3, HD4). Definition T V (HDTV) digital analog combined video recording / reproducing apparatus, characterized in that each configured to have a ± 15 degrees to each charge myusseu recording and reproducing a digital signal such as. The digital signal head (HD1, HD4) according to claim 1, wherein the control means (9) turns on the analog input switching means (6) and the analog head switching means (19) to reproduce a signal recorded on a tape and at the same time another digital signal head (HD1, HD4). Digital analog video recording / playback device characterized in that the recording configuration using).