KR960005646B1 - Controlling method for magnetic recording/playing mode - Google Patents

Abstract

The method records the television broadcast signal or external image signal at various recording speeds and its maximum recording speed ratio is 6 times the standard speed so as to record 12 hour video programm on a 2 hour video tape. The method comprises the steps of : detecting the frequency of a capstan motor at the playing mode, determining if the detected frequency is a standard play mode, a 2 times the standard play mode or 1/6 times the standard play mode, and controlling the rotary speed of the capstan motor on the detected play mode; is the recording mode is detected, automatically controlling the motor speed according to the mode selected by the user.

Description

Magnetic recording playback mode control method

1 is a block diagram for realizing a magnetic recording reproduction mode control method according to the present invention.

2A and 2B are control flowcharts of the microcomputer showing the states according to the magnetic recording reproduction modes.

* Explanation of symbols for main parts of the drawings

1: microcomputer 2: audio processor

4: video processing unit 6: video head

8: Audio head 10: Servo device

12: capstan motor driving unit 14: capstan motor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for controlling the mode-by-mode state of a magnetic recording apparatus such as a video tape recorder or a camcorder, and more particularly, to record a TV broadcast signal or an external video signal on a 2-hour video tape for up to 12 hours. A magnetic recording reproduction mode control method is provided.

In general, a magnetic recording and reproducing apparatus such as a video tape recorder can reserve and reproduce an external video signal or a television broadcast, and a magnetic recording and reproducing apparatus such as a camcorder can capture a desired subject and play it back when necessary. In such magnetic recording and reproducing apparatuses, video tapes capable of recording information are used, which have a recording and playback time of 120 minutes, 90 minutes, 60 minutes, and 30 minutes, that is, T-120, T-90. , T-60 and T-30 are mainly used.

However, current magnetic recording and reproducing apparatuses are produced and marketed in various forms in order to record and reproduce a large amount of information on one video tape for a long time. For example, the standard mode (hereinafter referred to as SP mode) for recording and reproducing external information for 60 minutes on a 60-minute video tape (T-60), and the mode for recording and reproducing for 120 minutes (Long Play; referred to as LP mode) A magnetic recording and reproducing apparatus having various functions such as a mode capable of recording and reproducing for 180 minutes (SuperLong Play; hereinafter referred to as SLP) has been produced and marketed.

The above-described LP and SLP modes have the advantage of recording and reproducing information for a long time by slowing the rotation speed of the capstan motor as compared to the SP mode, while the HP mode records the information for a short time by increasing the rotation speed of the capstan motor. And high density recording by reproducing.

By the way, in the LP and SLP modes, it is possible to reproduce information recording for a long time by slowing down the rotation speed of the capstan motor, but deterioration of image quality occurs when the rotation speed is excessively slow.

To this end, development of an apparatus for recording and reproducing information on video tapes at 1/4 times, which is more than 1/3 times, has been attempted, but a complete product is not produced and marketed due to the lack of a drum head and a control circuit thereof. I can't. The biggest reason for this is the lack of accurate control technology for video head and capstan motors.

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to play back a magnetic recording / playback apparatus by recording information for up to 12 hours in various modes, especially a 2-hour video tape, or a 2-hour video tape. The present invention provides a method of controlling a magnetic recording reproduction mode in which information can be recorded and reproduced for at least one hour.

A feature of the magnetic recording reproduction mode control method according to the present invention for achieving the above object is the capstan motor in the reproduction mode in the recording reproduction mode control method in which a video signal and an audio signal can be recorded and reproduced on a video tape. Controlling the rotational speed of the capstan motor to match the speed in the corresponding mode by determining the frequency of the signal, and determining the standard mode, the 2x mode, and the 1 / 6x mode as the determined frequency signal. The speed of the motor is automatically controlled according to the selected mode, but the audio level is increased by + 6dB based on the standard mode in 1 / 6x playback mode, and in standard mode in 1/6 recording mode. This is to control the rotation speed of the motor so that it is attenuated by -6dB.

EMBODIMENT OF THE INVENTION Hereinafter, one preferred embodiment of the magnetic recording reproduction mode control method according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a system for controlling a magnetic recording reproduction mode according to the present invention, in which the microcomputer 1 has a system in which the SP mode, LP mode, SLP mode, HP (High Performance; It generates a signal that performs a 1 hour rustable mode) mode and ULP (Ultra Long Play; 2 hour video tape mode). Therefore, the microcomputer 1 generates various control signals for these functions. In FIG. 1, the control signals for the SP mode, the LP mode, and the SLP mode are omitted, and only the HP mode and the ULP mode will be described. Shall be.

In the recording or playback mode, the microcomputer 1 provides these mode information, that is, ULP / HP active information, to the audio processor 2 and the video processor 4, in which case the video processor 4 receives the input video signal. Process the video head 6 to record on the video tape, and the audio processor 2 also processes the input audio signal to cause the audio head 8 to record on the video tape.

However, the audio processor 2 attenuates the audio signal level by -6 dB in the ULP recording mode so that the audio signal is recorded on the audio track of the video tape, and increases the audio signal level by +6 dB in the ULP playback mode to output the audio signal. It is desirable to maintain compatibility.

On the other hand, the microcomputer 1 determines the capstan frequency signal C-FG input from the servo device 10 in the regeneration mode to discriminate whether the current mode is ULP or HP mode.

At this time, the microcomputer 1 provides the clock signal CLK and the data DTA to the servo device 10 and receives the control signal CTL from the servo device 10.

In addition, the microcomputer 1 provides ULP information to the capstan motor driver 12 when the current mode is the ULP mode, thereby controlling the rotational speed of the capstan motor 14. On the other hand, the servo device 10 to provide the head switching signal (H'D S / W) to the video processing unit 4 in the HP mode and ULP mode.

The operation of the system configured as described above will be described as a flowchart shown in Figs. 2 (a) and 2 (b).

FIG. 2 (a) illustrates a control process of the microcomputer 1 in the HP mode or the ULP mode. First, when power is applied to the microcomputer 1 shown in FIG. 1, the microcomputer 1 Determines whether the current mode is the playback mode.

If the current mode is the playback mode, the program proceeds to the stem S2 at step S1, and if it is not the playback mode but the recording mode, the program proceeds to FIG.

When the current mode is the reproduction mode, the microcomputer 1 compares the input capstan frequency signal with the console signal recorded on the tape (step S2). Determining what the selected mode is in the reproduction mode can be determined by comparing a capstan frequency signal with a control signal recorded on the tape and entering a capstan frequency signal of several Hz in one period of the control signal. If it is determined that the signal is a signal for SP (Standard: SP, LP, SLP, and HP (audio only)), the microcomputer 1 advances the program from step S3 to step S4, and the audio processor 2 And the video processor 4 operate normally.

However, if the currently input capstan frequency signal is not the SP capstan frequency signal, the program proceeds from step S3 to step S5, where the microcomputer 1 also detects the capstan frequency signal currently input. . If the input signal is a capstan frequency signal for the HP mode, the program proceeds from step S5 to step S6. That is, the microcomputer 1 determines whether the frequency signal of the capstan motor input from the servo device 10 corresponds to HP (for example, 2160 Hz), and when the input frequency signal is 2160 Hz, the microcomputer enters the HP mode. To control the speed of the capstan motor. For this purpose, the microcomputer 1 provides the serial data to the servo device 10 (step S7).

Then, HP information is provided to the video processing unit 4 and the capstan motor drive unit 12 (step S8). By doing so, the video processing unit 4 changes the video characteristics of the capstan motor 14 while the SP mode rotates at twice the speed (step S9).

Then, the microcomputer 1 determines whether or not the reproduction state has ended (step S10). If the playback state ends, the program ends, but if the playback state continues, the program returns from step S10 to step S9 to repeat the above-described operation.

On the other hand, as a result of the determination in step S5, if the current mode is not the HP mode, the program proceeds to step S11. If the capstan frequency signal currently input is a signal for ULP mode, the program proceeds from step S11 to step S12. At this time, the microcomputer 1 rotates the capstan motor at a speed suitable for the ULP mode.

If the input frequency signal is 180 Hz, the microcomputer 1 provides the serial data to the servo device 10 (step S13). Thereafter, the microcomputer 1 supplies the ULP information to the audio processing unit 2, the video processing unit 4, and the capstan motor driving unit 12 in a high state (H) (step S14). At this time, the audio processing unit 2 increases the audio level to be reproduced by +6 dB and outputs it, in order to maintain compatibility with other video tapes (step S15). In addition, the video processing unit 4 also changes its video characteristics to match the ULP mode (step S16).

Then, the microcomputer 1 determines whether the ULP regeneration mode is complete and terminates the program when the regeneration state ends, but returns the program from step S17 to step S15 when the regeneration state continues. The above operation is repeated.

(B) of FIG. 2 is a control flowchart in the recording mode. As a result of the determination in step S ₁ shown in (a) of FIG. the flow proceeds to step (S20) from (S _1).

If the user selects the SP mode while the current mode is the recording mode (step S21), the corresponding function can be selected and performed (step S22).

However, when the user HP mode is selected, the program proceeds from step S23 to step S24. At this time, the microcomputer 1 causes the capstan motor to rotate at a speed suitable for the HP mode (step S24). That is, the microcomputer 1 determines whether the frequency signal of the capstan motor input from the servo device 10 corresponds to HP (for example, 2160 Hz). When the input frequency signal is 2160 Hz, the microcomputer 1 supplies the serial data to the servo device 10 (step S25). Then, the HP information is provided to the video processor 4 and the capstan motor driver 12 (step S26). By doing so, the video processing unit 4 changes their video characteristics while the capstan motor 14 rotates at twice the speed of the SP mode (step S27).

Then, the microcomputer 1 determines whether the recording state has been completed (step S28). If the recording state is completed, the program ends, but if the recording state continues, the program returns from step S28 to step S27 to repeat the above-described operation.

On the other hand, when the user selects the ULP mode without selecting the HP mode, the program proceeds from step S31 to step S32. When the ULP mode is selected, the servo device controls the motor speed so that the frequency of the input capstan motor corresponds to the ULP mode (eg, 180 Hz).

In the ULP mode, the microcomputer 1 provides the serial data to the servo device 10 (step S33). Thereafter, the microcomputer 1 provides the ULP information to the audio processing unit 2, the video processing unit 4, and the capstan motor driving unit 12 in the high state H (step S34).

At this time, the audio processing unit 2 attenuates and records the audio level to be recorded by -6 dB, in order to maintain compatibility with other video tapes (step S35). In addition, the video processing unit 4 also changes its video characteristics to match the ULP mode (step S36).

Then, the microcomputer 1 determines whether the ULP recording mode has ended and terminates the program when the recording state ends, but returns the program from step S37 to step S35 when the recording state continues. The above operation is repeated.

As described above, the present invention installs a plurality of video heads and audio heads for the SP mode, the LP mode, the SLP mode, the ULP mode, and the HP mode in the drum assembly, and records the information on the video tape at various speeds or reproduces the information therefrom. In particular, it can record programs for up to 12 hours and at least 1 hour on a 2-hour video tape.

Claims (1)

A recording and playback mode control method for recording and reproducing a video signal and an audio signal on a video tape; Determining a frequency of the capstan motor in the regeneration mode, and determining a standard mode, a double speed mode, and a 1/6 speed mode as the determined frequency signal to control the rotation speed of the capstan motor to match the speed in the corresponding mode; In the recording mode, the speed of the motor is automatically controlled according to the mode selected by the user.In the 1 / 6x playback mode, the audio level is increased by + 6dB based on the standard mode. In the mode, the magnetic recording reproduction mode control method characterized in that to control the rotational speed of the motor to attenuate by -6dB relative to the standard mode.