KR20010010176A - An enhanced fuzzy audio/video tape tuning system - Google Patents

Abstract

PURPOSE: A method for optimum recording/playing back by using characteristic of recording medium is provided to represent high band frequency characteristic while preventing error in envelope detection. CONSTITUTION: Audio/video signals are separately recorded in a recording medium. Recording amplify levels of the signals are detected for calculating difference. The value is compared with an established optimum difference. Recording amplify levels are adjusted to optimum values based on the result of comparison. The recording medium is moved to an initial signal recording location for playing back. Characteristic of the recording medium is decided by detecting audio/video signals. Optimum recording/reproducing conditions are established based on characteristic of the recording medium.

Description

Optimal recording / playback method using characteristics of recording media {An enhanced fuzzy audio / video tape tuning system}

The present invention relates to an optimal recording / reproducing method using the characteristics of a recording medium, and to an optimum recording / reproducing method using the characteristics of a recording medium in which optimal recording and reproducing is performed according to the characteristics of the medium according to the characteristics of the recording medium. It is about.

As shown in FIG. 1, a related configuration of a video signal processing unit of a general video recording / reproducing apparatus amplifies and outputs a recording signal to a recording tape, which is a medium for recording / reproducing a video signal, and a reproduction signal from a recording tape to a predetermined size. An amplifier 1; A video equalizer for outputting a video signal for recording to the amplifying section 1 and performing image quality compensation and noise removal for the reproduced video signal output from the amplifying section 1, depending on the characteristics of the recording tape. ) And a video signal processing unit 3 for correcting the noise canceller; A video signal envelope detector 5 for converting and outputting the level of the reproduced RF-FM signal output from the amplifier 1 into a D.C value; The controller 7 determines the characteristics of the inserted recording tape based on the value output from the video signal envelope detector 5, and then determines the degree of compensation according to each tape characteristic and applies it to the video signal processor 3. ); And a servo driver 9 for controlling the operation of mechanism-related components such as a capstan motor when performing a tape tuning mode.

When recording and reproducing is performed using the conventional video recording / reproducing device configured as described above, the characteristics of the inserted recording / reproducing medium (recording tape), for example, the magnetic density level, are determined, and then the recording and reproducing operation is performed accordingly. It is possible to record and play back with the most optimal image quality and sound quality. For this purpose, the characteristics of the recording medium are identified through tape tuning mode during recording, and a separate I-HQ (Inteligent) is used during playback. Through the High-Quality mode, characteristics of the playback media were identified.

Hereinafter, the tape tuning mode will be described with reference to FIG. 2 which schematically illustrates the process.

If the user selects the tape tuning mode on the OSD screen before actually performing a recording operation on a desired video, the controller 7 controls the video signal processor 3 to perform a video E / E mode state. Outputs a video signal for a period corresponding to about 50 CTL pulses, and amplifies and outputs the video signal through the amplifying unit 1 to record on a recording tape. VISS (VHS Index Search System) marking '00' is marked at the point (1 section in Fig. 2).

When all video signals of a section corresponding to about 50 control pulses are recorded, the controller 7 controls the servo driver 9 to stop the tape from moving (STOP) to the point where the VISS marking is performed. In the reverse direction, rewinding to the initial position where the recording is started (REW) is performed (section ② of FIG. 2).

Subsequently, the control unit 7 controls the servo drive unit 9 to start playing back the pre-recorded signal while driving the tape again in the forward direction. Then, the envelope value of the reproduced video signal outputted from the amplifier 1 is detected using the video signal envelope detector 5 (3 section in FIG. 2).

When the envelope value of the reproduction signal is detected, the controller 7 calculates the value of the constant K only by using the detected value, various reference envelope values, and Equation 1 below.

In the above equation, V _ref is a video signal envelope value output at a normal tape level and data input in a manufacturing process, and V ₀ is a video signal envelope value output during reproduction after no signal self recording. V _PB is the data that is input to the microcomputer after monitoring the envelope voltage after auto tracking.

The controller 7 converts the calculated constant K value into reference data A (= reference data for disc determination with high magnetic density) and B (= reference data for disc determination with low magnetic density) that are input during initial programming. If the value of the constant K is larger than A, it is determined as a hard picture, and if it is smaller than A, it is determined whether it is larger than B. If it is smaller, it is determined as a soft picture. If not, that is, smaller than A but larger than B, it is determined to be a normal picture.

When the determination of the magnetic density level of the recording medium is completed, the control unit 7 controls the servo driver 9 again to rewind the recording tape to the initial position marked with the VISS marking (section ④ in FIG. 2). When the video signal for recording is input while waiting for recording pause, the input video signal is recorded using an optimal recording current corresponding to the determined characteristic of the recording medium. .

On the other hand, apart from the tape tuning mode performed before the recording operation, even when the pre-recorded video signal is to be reproduced, the characteristics of the recording tape on which the video signal is reproduced are accurately determined, and then the playback data set corresponding thereto is determined. When the user selects a separate I-HQ mode on the OSD screen M, the control unit 7 obtains the K constant obtained through the same process as in the tape tuning mode. The characteristic of the recording tape as a reproduction medium was determined using the value of, and the optimum characteristic reproduction could be performed based on this by transmitting the tape characteristic data thus obtained to the video shoot processing unit 3.

However, in the conventional video recording and playback system configured and operated as described above, the tape tuning mode and the I-HQ mode are specified separately on the OSD during playback.

In addition, in order to calculate the K constant used in Equation 1, the V _ref value should be set during the manufacturing process or at the time of programming. When the margin of data is low, the normal tape is super-VHS in the judgment process. There has been a problem that a misjudgment occurs with a tape or vice versa.

In addition, when the video signal envelope is detected, even if there is surface damage such as scratches on the tape, the video signal envelope DC value is simply converted into an integral value. weak) There was a problem in that a case of misjudgment by a tape or vice versa.

In addition, in the case of Hi-Fi deep recording, if the recording characteristics are excessively improved, there are various problems such as a high possibility of occurrence of Buzz and Hi-Fi sensation in a tape having a thin tape thickness.

Therefore, the present invention was created to solve the above problems, and applies correction values according to the characteristics of recording media not only for video but also for audio signals, and is free of audio buzz and Hi-Fi due to recording current variation. It is an object of the present invention to provide an optimal recording / reproducing method using the characteristics of a recording medium which can prevent, realize high frequency characteristics when rusting a high grade tape, and prevent an envelope detection error.

1 illustrates a configuration of a general video recording player,

2 is a timing diagram of a conventional tape tuning mode,

3 is a timing diagram of a conventional I-HQ mode,

4 is a block diagram of an embodiment of an image recording and reproducing apparatus for implementing an optimal recording / reproducing method using characteristics of a recording medium according to the present invention.

5 is a flowchart of an optimal recording / reproducing method using characteristics of a recording medium according to the present invention;

6 is a timing diagram of an optimal recording / reproducing method using characteristics of a recording medium according to the present invention;

7 and 8 are waveform diagrams of a video signal and an audio signal used as pilot signals,

9 and 10 are waveform diagrams of a video signal and an audio signal corrected by an optimal recording / reproducing method using characteristics of a recording medium according to the present invention;

11 shows the RF waveform and the envelope waveform when the tape is scratched.

※ Explanation of code for main part of drawing

1,11,21: amplifier 3,13: video signal processor

5, 17: video envelope signal detection unit 7,32: control unit

9,34: servo drive part 15,25: switch part

23: audio signal processor 27: audio envelope signal detector

30: comparator

In order to achieve the above object, an optimal recording / reproducing method using the characteristics of a recording medium according to the present invention comprises separately recording the generated audio and video signals on the recording medium, respectively, when setting the characteristic discrimination mode of the recording medium. First step; A second step of moving the recording medium to the first signal recording position and reproducing after the division recording is completed; A third step of detecting characteristics of a recording medium by detecting the reproduced audio and video signals; And a fourth step of setting and applying an optimal recording and reproducing condition based on the determined characteristic of the recording medium, wherein the first step detects a recording amplification level of the audio and video signals to be recorded separately. A lower first step; A lower second step of calculating a difference in amplification level of each detected signal; A lower third step of comparing the calculated difference value with a preset optimal difference value; And a fourth lower step of adjusting the recording amplification level of each signal to an optimum value based on the comparison result.

Hereinafter, preferred embodiments of an optimal recording / reproducing method using the characteristics of the recording medium according to the present invention will be described in detail with reference to the accompanying drawings.

4 illustrates a schematic configuration of an apparatus for implementing an optimal recording / reproducing method using the characteristics of a recording medium according to the present invention.

An amplifying unit 11 for amplifying and outputting a recording signal to a recording tape for recording / reproducing a video signal and a reproduction signal from the recording tape to a predetermined size; A video equalizer for outputting a recording video signal to the amplifying unit 11 and performing image compensation and noise reduction of the reproduced video signal output from the amplifying unit 11 according to the characteristics of the recording tape. ) And a video signal processor 13 for correcting the noise canceller; A switching unit 15 for selectively outputting one of a reproduced video signal output to the video signal processor 13 and a recorded video signal output to a video head; A video signal envelope detector (17) for converting and outputting the level of the recording / reproducing RF-FM signal output from the switching unit (15) into a D.C value; An amplifier 21 for amplifying and outputting a recording signal to a recording tape for recording / reproducing an audio signal and a reproduction signal from the recording tape to a predetermined size; An audio equalizer for outputting a recording audio signal to the amplifier 21 and performing image compensation and noise reduction of the reproduced audio signal output from the amplifier 21 according to the characteristics of the recording tape. ) And an audio signal processor 23 for correcting the noise canceller; A switching unit 25 for selectively outputting one of a reproduced audio signal output to the audio signal processor 23 and a recorded video signal output to a video head; An audio signal envelope detection unit 27 for converting and outputting the level of the recording / reproducing RF-FM signal output from the switching unit 25 into a D.C value; A comparator 30 for comparing and outputting the values output from the video signal envelope detector 17 and the audio signal envelope detector 27; A control unit 32 for detecting and adjusting the optimum value of the recording current based on the output value of the comparator 30 and for determining the type of tape during reproduction; And a servo driver 34 for controlling the operation of mechanism related components such as a capstan motor.

An optimal recording / reproducing method using the characteristics of the recording medium according to the present invention using the video signal recording / reproducing apparatus configured as described above will be described in detail with reference to FIGS. 5 and 6.

When a tape-tuning ON mode is input by the user while the first recording tape is inserted, the controller 32 records a pilot signal while operating the recording / reproducing apparatus in the recording mode. On the other hand (S10), at this time, the specific signal is recorded in the CTL pulse so that the first signal recording position is known, so that the initial position can be easily found during the subsequent rewind operation (1 section in FIG. 6).

When recording the pilot signal, the control unit 32 controls the video signal processing unit 13 to record only a sync carrier signal as a video signal, and controls the audio signal processing unit 23 to control 1K㎐. It is preferable to record only one single signal on the recording tape, such as recording only a sine wave as an audio signal (see Fig. 7). The reason for recording only a single signal as described above is to reduce the recording / reproducing level deviation caused by the change in the waveform and frequency characteristics of the input signal.

Simultaneously with the recording of the pilot signal, the switch section 15, 25 moves to a position R for outputting a recording signal, whereby the video signal envelope detector 17 and the audio signal envelope detector 27 Detects the recording amplification levels of the video signal and the audio signal output to the video head and the audio head, respectively, via the amplifiers 11 and 21 (step S11 in FIG. 6).

The detected audio amplification level value and the video amplification level value are input to the comparator 30, and the difference value (K _R = A _RENV -V _RENV ) and the predetermined optimal value (α = Optimal Record Current (ORC) Data) The comparison process of (S12).

For example, in the case of the Hi-Fi set, the optimum values of the audio recording current and the video recording current are 4.0 V _{pp for the} audio and 3.0 V _{pp for the} video, respectively (see FIG. 8). _It is set to _pp (4.0-3.0).

However, if the ORC characteristic of the audio recording head is good and A _RENV &gt; 4.0, since the value of the constant K _R becomes larger than the optimum value α, the control unit 32 has a level such that the value of K _R becomes 1. If the audio recording current is down (S13), and if the ORC characteristic of the audio recording head is bad and A _RENV <4.0, the value of the constant K _R becomes smaller than the optimum value α, so that the control unit ( 32) ups the audio recording current to a level where the value of K _R becomes 1 (S14).

The control unit 32 repeatedly performs such a process, and performs a gain adjustment process of a recording amplification level that finds a correction value at which the value of K _R is 1, that is, an audio recording current most suitable for recording. (S15) (3 section in Figure 6). In the above description, a process of finding an optimum recording current of an audio signal has been described.

The optimal recording current data corrected through the above process is applied during normal recording after the tape tuning mode is completed, and is continuously updated every time the tape tuning mode is performed. It is possible to respond continuously.

When the recording process of the signal for the tape tuning mode is completed, the control unit 32 controls the servo driver 34 to stop the forward progress of the recording tape once, and then the reverse direction of the recording tape to perform the initial recording. Rewinding to an initial position is performed through the specific display recorded (S16) (section ④ in Fig. 6). Once the initial position is reached, the control unit 32 advances the recording tape again and forwards the recorded video and audio signals. In this case, the output mode of the set performs the internal regeneration operation only while maintaining the E / E mode which is the initial setting mode.

During playback, the control unit 32 first adjusts the recording track through the ATR (Auto Tracking) process (section ⑤ in FIG. 6), and then the video signal envelope detector 17 and the audio signal envelope detector 27 Envelope values of the video signal and the audio signal are detected (S21 and S22), and the detected envelope values are compared according to the reference values shown in Table 1 below to determine the magnetic density levels of the recording and reproduction tapes.

Tape type classification criteria Tape separator weak normal super / HG Video Envelope DC Less than 2.0 (β _L ) 2.0 to 3.0 Greater than 3.0 (β _h ) Audio Envelope DC Less than 1.0 (γ _L ) 1.0 to 4.0 Greater than 4.0 (γ _h )

First, is the envelope DC value of β _h (= 3.0) to (S23) and compare the value, if greater than β _h value, the control unit 32 of the first set reference value a (K _VP) to experimental values detected for a video RF signal The recording tape is determined to be high grade (HG) or super tape, and at this time, the recording tape is corrected to a characteristic capable of maximizing the resolution of the video signal (S25).

For example, in the case of reproduction, as shown in FIG. 9A, the high frequency gain of the reproduction EQ is increased, and the sharpness characteristic is also increased to maintain the S / N under normal conditions. To achieve high resolution effects. In addition, in the case of recording, as shown in Fig. 9B, the recording color band width is raised to correct the color S / N and outlines.

In the case of an audio RF signal, the detected envelope DC value (K _AP) to also first the reference value of γ _h (= 4.0) value compared with the (S24), is greater ten thousand and one more γ _h value recorded tape set in the experimental values are also In this case, as shown in FIGS. 10A and 10B, in the case of playback and recording, the high frequency gain value is increased to correct the data with a characteristic that can improve the high frequency voice signal and the dynamic voice fidelity. (S26).

On the other hand, if it is determined that both the video envelope DC value K _VP and the audio envelope DC value K _AP are smaller than the β _h value and the γ _h value, the controller 32 continues to adjust each value to the β _L value ( = 2.0) and γ _L (= 1.0) values (S27, S28), when larger than β _L value and γ _L value, it is determined that the tape is normal (S29, S30). On the contrary, when the value is smaller than the β _L value and the γ _L value, it is determined that the recording tape is a weak tape, and the data is corrected in the direction of suppressing the high frequency transmission characteristic in the image quality and sound quality characteristics (S29, S30). Do not disturb (⑦ section of Figure 6).

On the other hand, if there is a scratch (scratch) on the recording tape as shown in Figure 11, if reflected as it is when calculating the envelope DC value, the inherent characteristics of the high-grade tape due to the RF missing in this section is normal or Since there is a possibility of being misleading as a degraded tape, as shown in FIG. 8, in order to reduce detection errors in the video envelope DC value K _VP and the audio envelope DC value K _AP calculation process, the tape may be reduced. The DOC DET PULSE corresponding to the scratch section of the output is inputted to the controller 32, and the envelope DC value of the t ₁ and t ₂ sections is ignored and calculated to prevent the envelope detection error.

In the above embodiment, an example of inputting an analog signal onto a recording tape has been described. However, the same tape tuning logic is applied to a digital product such as a DVD or a D-VHS to apply a recording voltage pulse of a pickup to disk characteristics. You can also make corrections automatically.

The optimal recording / reproducing method using the characteristics of the recording medium according to the present invention as described above applies a correction value according to the characteristics of the recording medium to not only video but also audio signals in a product using the recording / reproducing medium. It is a very useful invention that prevents audio buzz and Hi-Fi insensitivity due to current deviation, enables high-frequency characteristics when the high-grade tape is burned out, and prevents envelope detection error.

Claims (8)

A first step of separately recording the generated audio and video signals on the recording medium, respectively, when setting the characteristic determination mode of the recording medium; A second step of moving the recording medium to the first signal recording position and reproducing after the division recording is completed; A third step of detecting characteristics of a recording medium by detecting the reproduced audio and video signals; And And a fourth step of setting and applying optimum recording and reproducing conditions based on the determined characteristics of the recording medium. The method of claim 1, The first step is, A lower first step of detecting recording amplification levels of the separately recorded audio and video signals; A lower second step of calculating a difference in amplification level of each detected signal; A lower third step of comparing the calculated difference value with a preset optimal difference value; And And a lower fourth step of adjusting the recording amplification level of each signal to an optimum value based on the comparison result. The method of claim 1, And record the identification signal for identifying the start position of the delimiter proxy and the signal recording section of the first step, And the second step is to move to the start position based on the identification signal. The method of claim 1, The recording medium characteristic determination of the third step, A first step of measuring envelope voltage values of the reproduced audio and video signal; A lower second step of comparing the measured envelope voltage value with a predetermined recording medium characteristic division value; And And a lower third step of determining the characteristics of the recording medium on the basis of the comparison result. The method of claim 4, wherein The lower first step is to optimize the recording / playback method using the characteristics of the recording medium, characterized in that for measuring the envelope voltage value except for the damaged section of the recording medium due to external factors. A video and / or audio signal processor for outputting a test video signal and / or an audio signal; A recording and / or playback head for recording and / or playing back the video signal and / or audio signal on a recording medium; A comparator for comparing the video signals and / or audio signals reproduced from the recording and / or playhead; And And a control unit for setting and applying an optimum recording and reproducing condition based on a value output from the comparator. The method of claim 6, The comparator, A switching unit for selectively outputting one of a reproduction video and / or audio signal output from the reproduction head or a recording video and / or audio signal output to the recording head; An amplifier for amplifying and outputting a video signal and / or an audio signal reproduced from the selectively output recording and / or playhead to a predetermined size; And And a video and / or audio envelope detector for converting and outputting the level of the amplified output recording and / or reproducing RF-FM signal into a DC value. Device for The method of claim 6, The video and / or audio signal processing unit may include a video equalizer and a noise canceler for performing image compensation and noise cancellation of the reproduced video and / or audio signal output from the amplifier. Device for optimal recording using characteristics.