KR950005250B1 - Digital/analog double use recording & playing method and system - Google Patents

Abstract

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Description

Digital / analog recording and playback method and apparatus therefor

1 is a block diagram of a head drum according to the present invention.

2 is a block diagram of a digital / analog recording and reproducing apparatus of the present invention.

3 is an exemplary view showing a recording pattern of a tape according to the present invention.

* Explanation of symbols for main parts of the drawings

1A, 1B: Recorder 2A, 2B: Player

3: head drum 4: signal separation unit

5 signal synthesis unit 6 Capstan

7: Pinch Roller HA ₁ , HA _2, HB ₁ , HB ₂ : Head

SW ₁ -SW ₆ : Switch M ₁ : Motor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording and reproducing apparatus, and in particular, by using a digital head and an analog head at the same time during digital signal recording and reproduction, the present invention applies to a digital method having a high recording density and records and reproduces only an analog head during analog signal recording and reproduction. The present invention relates to a digital / analog recording / reproducing method and apparatus for making it compatible with the VHS method.

In general, when the video signal itself is a digital signal such as a high-definition television (HD-TV), the amount of information of the video signal is much higher than that of the analog method (at least 5 times that of the analog method). Much higher density recordings are needed than video tapes, and video tape consumption is about the same.

However, the conventional VRC is a method of recording only an analog video signal or a method of recording only a digital signal, and a tape recording an analog video signal cannot be played back in a digital VC, and a tape recorded a digital video signal cannot be played back in an analog VAL. .

That is, in the conventional VRC, only the digital method or the analog method is applied, so that mutual data between the two methods may not be transferred interchangeably, and thus compatible reproduction is impossible. Therefore, when the two methods are required at the same time, there is a problem in that the V2 with different methods have to be equipped.

In order to solve this problem, the present invention uses only an analog head for recording and reproducing an analog video signal, and uses a single head drum for simultaneously using a digital head and an analog head according to mode control for recording and reproducing an analog video signal. By switching the head to have two or more different recording densities, it is possible to record and reproduce digital video signals, and to create a digital / analog recording and playback method and a device having analog and analog video signal recording and reproducing functions. When described in detail with reference to the accompanying drawings as follows.

The present invention adopts the conventional helical driving method and controls the mode according to the user's request and signal to select the digital recording reproduction and analog recording reproduction functions. The head and the digital signal band corresponding to the analog signal band in one head drum are selected. Are simultaneously mounted to switch each head of the head drum in accordance with the recording or playback mode.

2 is a block diagram of a digital / analog recording and reproducing apparatus of the present invention, as shown in this figure, which is rotated by a capstan drive motor M ₂ driven under the control of a controller (not shown) to convey a tape. A switch SW ₁ for selecting an analog signal SA ₁ or a digital signal SD ₁ under the control of the capstan 6 and the control unit (not shown) in the recording mode, and the switch SW _1. A signal separation unit 4 for dividing the selected digital signal SD ₁ into an analog signal band and a digital signal band, and a recording unit for amplifying and modulating the analog band signal of the switch SW ₁ and the signal separation unit 4. 1A, the recording unit 2A for amplifying and modulating the digital band signal of the signal separating unit 4, and the output VA ₁ of the recording units 1A and 2A in the recording mode repeatedly selected according to the mode. Switch (SW ₂ , SW ₃ ) output to the head (HA ₁ , HA ₂ ) (HB ₁ , HB ₂ ) (SW ₄ , SW ₅ ) and the switch (SW ₂ , SW3) (SW ₄ , SW ₅ ) that is repeatedly switched in the regeneration mode of the head (HA ₁ , HA ₂ ) (HB ₁ , HB ₂ ) A playback unit 2A (2B) for receiving the detection signal and reproducing the respective signals, and switching the output 2A ₀ of the playback unit 2A under the control of the controller (not shown) according to the playback signal in the playback mode The switch SW ₆ and the signal synthesizing unit 5 for synthesizing and outputting the output SA ₀ (SD ₀ ) at the time of reproducing the digital signal. (Pinch Roller) and 8A, 8B are guide posts.

The recording units 1A and 1B comprise a pre-amp, a modulator, an equalizer, and the like.

As shown in FIG. 1, the head drum 3 is equipped with a head HA ₁ (HB ₁ ) (HA ₂ ) (HB ₂ ) at 90 ° intervals, so that the head drum 3 is mounted on two guide posts 8A, 8B. The tape is configured to have a winding angle of 180 degrees or more.

The heads HA ₁ and HA ₂ are heads for analog signals having an opposite angle of 180 °, each having an azimuth angle of ± 6 ° to record and reproduce a conventional VHS signal, and the head HB _1. (HB ₂ ) is a digital signal head having an opposing angle of 180 ° and a phase angle of 90 ° each with the head HA ₁ (HA ₂ ) and an azimuth angle of ± 15 °, respectively.

On the basis of the detection signal of the phase generator (PG) mounted on the head drum (3), the controller (not shown) switches the switches (SW ₂ -SW ₅ ) to the heads HA ₁ , HA ₂ (HB). ₁ , HB ₂ ).

The head drum 3 is rotated at 1800 rpm (5.8 m / s in the case of a 62 mm diameter drum) in the case of a digital signal and an analog signal by a drum driving motor M ₁ driven under the control of a controller (not shown). Lose.

The operation and effect of the present invention configured as described above will be described in detail with reference to an exemplary view showing the recording pattern of the tape of FIG.

First, in the case of recording an image signal, an analog signal SA ₁ or a digital signal SD ₁ is selected as the switch SW ₁ is switched by the control of a controller (not shown) that determines a recording method.

At this time, in the case of recording the analog signal, it is processed by a recording unit 1A including a pre-amplifier, an equalizer, a modulator, and the like, and is repeatedly switched under the control of the controller (not shown). Outputs to the heads HA ₁ and HA ₂ through the switches SW ₂ and SW ₃ .

That is, when recording the analog signal SA ₁ , the contacts b ₁ and c ₁ of the switch SW ₁ are connected by the control of the control unit (not shown), and the analog signal VA ₁ is connected to the recording unit 1A. The signal V ₁ which is output and amplified and modulated in this recording unit 1A is repeatedly selected by the switches SW ₂ and SW ₃ which are repeatedly switched by the head switching signal H.SW by the control unit (not shown). The tape output to the analog signal head HA ₁ HA ₂ and fed at a constant speed Vt is recorded in a pattern as shown in FIG.

In the case of recording the digital signal SD ₁ , the contacts a ₁ and b ₁ of the switch SW ₁ are connected so that the digital signal SD ₁ is an analog band signal VA in the signal separation unit 4. ₁ ) and the digital band signal VD ₁ , and are respectively amplified by a predetermined level in the recording units 1A and 1B, and then modulated to the head switching signal H.SW according to the control of the controller (not shown). It is recorded on the tape by outputting to the heads HA ₁ , HA ₂ (HB ₁ , HB ₂ ) through the switches SW ₂ , SW ₃ (SW ₄ , SW ₅ ) which are repeatedly switched.

Here, in the case of recording the digital signal, as the capstan 8 is rotated by the capstan driving motor M ₁ , the azimuth angle is -6 on the tape fed at the same speed Vt at the time of analog signal recording. Output of head HA _{1 with} °, output of head HB _{2 with} azimuth -15 °, output of head HA _{2 with} azimuth -6 ° and head HB _{2 with} azimuth + 15 ° The output is sequentially output so that the signal of the pattern as shown in Fig. 3A is recorded.

On the other hand, when reproducing the video signal, the contact point of the switch SW6 is switched by the control of the control unit (not shown) and the contact point of the switch SW ₂ , SW ₃ (SW ₄ , SW ₅ ) is switched to the head HA _1. , HA ₂ ) (HB ₁ , HB ₂ ) is output to the regeneration unit 2A (2B), the control unit (not shown) is detected by the phase generator (PG) built in the head drum (3) The switches SW _{2 to} SW ₅ are switched based on the signal.

At this time, when reproducing the digital video signal, the switch SW ₂ (SW ₃ ) is switched and the switch SW ₄ (SW ₅ ) is switched according to the switching signal H.SW by the controller (not shown). The azimuth angle signal of the analog band of ± 6 heads HA ₁ and HA ₂ is demodulated in the regeneration unit 2A and the azimuth angle The digital band signals of the heads HB ₁ and HB ₂ which are 15 are demodulated by the reproduction unit 2B.

That is, as the switches SW ₂ , SW ₃ , SW ₄ , and SW ₅ are switched, the pattern as shown in FIG. 3 (a) in the tape conveyed at the same speed Vt as when analog signals are recorded. Signal of head (HA ₁ ) with + 6 ° azimuth angle, head (HB ₁ ) with -15 ° azimuth, head (HA ₂ ) with -6 ° azimuth and head with + 15 ° azimuth It is sequentially detected in the order of (HB ₂ ), and is processed in the reproduction units 2A and 2B.

Accordingly, the output SA ₀ of the regeneration unit 2A and the output VD ₂ of the regeneration unit 2B outputted to the switch SW ₆ to which the contacts a ₆ and b ₆ are connected are connected to the signal synthesis unit ( 5) outputs the reproduced high definition TV (HDTV) signal SD ₀ .

When reproducing the analog signal, the controller (not shown) outputs the head switching signal H.SW to switch the switch SW ₂ and SW ₃ to convert the analog signal of the head HA ₁ HA ₂ . The reproduction unit 2A demodulates and outputs the reproduced NTSC signal SA ₀ to the switch SW ₆ to which the contacts b ₆ and c ₆ are connected.

As described in detail above, the present invention of the digital / analog recording and reproducing apparatus can record and reproduce digital signals and analog signals with one head drum by recording with a digital head and recording with an analog head at the time of digital signal recording. In addition to having the function of high-quality digital V-Cal, it is possible to play the existing analog tape and to record a video signal of a lot of information. In addition, the azimuth angle of the recording pattern is recorded in the order of + 6 °, -15 °, -6 °, + 15 °, and the heads are arranged to prevent the interference between adjacent tracks.

Claims (4)

A first step of selecting a recording or reproducing mode of digital or analog, a second step of performing recording or reproducing using an analog head when the analog mode is selected above, and an analog head when the digital mode is selected above And a third step of switching and controlling the digital head to perform recording or reproducing at different recording densities. According to claim 1, wherein the head (HA ₁ ) (HA ₂ ) and 180 and are respectively arranged at -180 degrees with + and-in the digital signal recording process, and the head (HA ₁ ) (HA) ₂ ) The heads (HB ₁ ) (HB ₂ ) are arranged 90 ° apart from each other so that recording tracks can be recorded in the order + HA ₁ , -HB _1, -HA ₂ , + HB ₂ to prevent interference with adjacent tracks. Digital / analog recording and playback method characterized by forming. The digital signal (SD ₁₎ is selected as an analog signal (SA ₁₎ or a switch for selecting digital signal (SD ₁₎ (SW ₁₎ and a switch (SW ₁₎ in accordance with the control of the recording mode control unit (figure undisplayed) A signal separation unit 4 for separating the analog signal band and the digital signal band, a recording unit 1A for amplifying and modulating the analog band signals of the switch SW ₁ and the signal separation unit 4, and the switch SW ₁ A recording unit 1B for amplifying and outputting a digital band signal inputted through the < _{RTI ID} = 0.0 > ₁ ) < / _RTI > and a head HA ₁ , HA ₂ (HB ₁ , HB ₂ ) which switches according to a recording or reproducing mode to record or reproduce an image signal And in the recording mode, the output V ₁ (V ₂ ) of the recording unit 1A, 1B is repeatedly switched to the head HA ₁ , HA ₂ (HB ₁ , HB ₂ ), and the head ( Switches SW ₂ and SW ₃ (SW ₄ and SW ₅ ) for switching the detection signals of HA ₁ and HA ₂ (HB ₁ and HB ₂ ) to the regeneration unit 2A and 2B; A switch SW ₆ for switching the output SA ₀ of the reproducing unit 2A according to the control of a control unit (not shown) according to the reproducing signal in the mode, and the switch SW ₆ and the reproducing unit during digital signal reproduction. A digital / analog recording and reproducing apparatus characterized by comprising a signal synthesizing section (5) for synthesizing and outputting the output (SA ₀ ) (SD ₀ ) of (2B). The method of claim 1, wherein when the digital mode is selected, a first process of switching and controlling two different types of heads to perform recording at different recording densities, and the same as the head type at the time of recording the digital signals recorded above. And a third process of performing reproduction by switching the head to perform reproduction, and a third process of synthesizing the signals reproduced by the two types of heads and outputting a TV signal.