JP3351134B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inputting program information corresponding to a program broadcasted from a broadcasting station using a video tape recorder or the like, and for displaying a program within a recording time on a magnetic tape based on the input program information. The present invention relates to a magnetic recording / reproducing apparatus configured to perform priority recording in a standard recording mode, and to switch to a low-speed recording mode halfway when the capacity of a magnetic tape is insufficient.

[0002]

2. Description of the Related Art Generally, video tape recorders (V
TR), digital audio tape recorder (DA)
In a magnetic recording / reproducing apparatus such as T), a magnetic tape is pulled out from a tape cassette by a plurality of tape loading members, and the drawn magnetic tape is spirally formed over a predetermined angle on a rotating drum that rotates integrally with a magnetic head. It is well-known that recording and reproduction are performed by helical scanning using a magnetic head that is wound around and rotated.

[0003] By using a video tape recorder or the like, program information corresponding to a program broadcast from each broadcasting station is input, and a program within a recording time is recorded on a magnetic tape at a standard speed based on the input program information. When the remaining tape time is insufficient, the magnetic recording / reproducing apparatus configured to be able to record all the programs by automatically switching from the middle of recording at the standard speed to a low speed lower than the standard speed. No. 29789. By prioritizing the image quality of programs recorded on magnetic tape, this magnetic recording / reproducing apparatus records programs in standard recording mode at standard speed as much as possible within the remaining time of the tape. Although it is somewhat inferior, it is possible to record the entire program by automatically switching to a low-speed recording mode (triple recording mode) at a low speed lower than the standard speed, making effective use of the tape usage relative to the remaining tape time. ing.

[0004]

As described above, the conventional magnetic recording / reproducing apparatus disclosed in Japanese Utility Model Publication No. 6-29789 automatically switches a magnetic tape from a standard speed to a low speed to execute a program. When recording, the tape running speed is switched, and the magnetic head that rotates integrally with the rotating drum to record the video signal in the program is switched from the magnetic head for the standard recording mode to the magnetic head for the low-speed recording mode. Therefore, recording disturbance occurs at the time of speed switching, and furthermore, when a recorded program is reproduced, if there is disturbance due to speed switching in an important scene in the program, it becomes very difficult to see.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a tape remaining time calculating means for calculating a remaining time of a magnetic tape, and a plurality of programs broadcasted from each broadcasting station. The program information input means for inputting at least one or more pieces of program information, and the remaining tape time calculated by the remaining tape time calculating means are compared with the amount of recording time based on the input program information to record. In order to record the program within the time on the magnetic tape at the standard speed, the speed switching timing for switching from the middle of recording at the standard speed to the low speed lower than the standard speed when the remaining tape time is insufficient is calculated. in the magnetic recording reproducing apparatus having a speed switching timing calculation means, and automatically switching speed switching means before Symbol magnetic tape from the standard speed to a low speed, the number Group to the voice mode of the input speech signal of the inner
Speed switching permission to detect the No. speed switching huh Kashin Hazuki
And signal detection means, speed switching timing of the calculated
Speed switching from a timing that is a predetermined time before
Set the period up to the switching timing as the speed switchable period
Setting means, and the speed switching means,
When detecting the speed switching Patent No. Cassin in speed switchable period, the detection timing, while automatically switching the magnetic tape from the standard speed to a low speed, the
If no speed switching permission signal is detected,
At the speed switching timing, the magnetic tape
The present invention provides a magnetic recording / reproducing apparatus characterized in that the speed is automatically switched from low to high .

[0006]

Therefore, in the magnetic recording / reproducing apparatus according to the present invention, in order to record the program within the recording time at a standard speed on a magnetic tape based on the input program information, the standard speed is used when the remaining tape time is insufficient. in when to automatically switch from the middle of recording a low speed, by detecting the input pilot signal for speed switching Patent Cassin No. as for example stereo broadcast from the audio signal of the program, the program by the pilot signal for the stereo broadcast For example, the magnetic tape is automatically switched from the standard speed to the low speed in accordance with a relatively insignificant commercial time zone.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a magnetic recording / reproducing apparatus according to the present invention will be described below in detail with reference to FIGS.

FIG. 1 is a diagram showing a configuration of a magnetic recording / reproducing apparatus according to the present invention, and FIG.
FIG. 3 shows a stereo audio signal and a pilot signal included only in a bilingual audio signal. FIG. 3 is a flowchart showing a recording operation of the magnetic recording and reproducing apparatus. FIG. 4 is a magnetic tape in the magnetic recording and reproducing apparatus. It is a figure showing the above-mentioned recording operation.

A magnetic recording / reproducing apparatus 10 according to the present invention shown in FIG. 1 includes program information input means for inputting at least one or more pieces of program information for a program broadcasted from each broadcasting station, This is applied to a well-known video tape recorder or the like provided with a reservation recording means for recording a record.

In FIG. 1, a tape cassette 1 is mounted in a magnetic recording / reproducing apparatus 10 in advance. In the tape cassette 1, a magnetic tape 2 is wound and stored between a supply reel 3 and a take-up reel 4. The magnetic tape 2 in the tape cassette 1 is drawn out of the tape cassette 1 by a pair of tape loading members 11A and 11B, and is wound around the rotating drum 12 at a predetermined angle. The rotating drum 12 is provided with a standard recording mode magnetic head 13A and a low speed recording mode magnetic head 13B for recording a video signal in a program, and these magnetic heads 13A and 13B are mounted on the rotating drum 12. It rotates integrally with the rotating drum 12. On this occasion,
The magnetic head 13A moves the magnetic tape 2 at a standard speed (3.335 cm /
Seconds) and applied to the standard recording mode of recording
On the other hand, the magnetic head 13B has a low speed (1.
This is applied to a low-speed recording mode (triple recording mode) for recording by running at 112 cm / sec.
13B is selectively switched according to the recording mode.

A full erase head (full width erasing head) 14 for erasing the magnetic tape 2 over the entire width is provided outside the tape cassette 1 and on the supply reel 3 side. On the other hand, the take-up reel 4 outside the tape cassette 1
On the side, an input audio signal in a program is recorded at the upper end of the magnetic tape 2, a control signal for tape running control is recorded at the lower end of the magnetic tape 2, and the recorded audio signal and control signal are An AC head (audio control head) 15 for separately reproducing, a capstan 16 for running the magnetic tape 2, and a cap for driving the capstan 16 and for driving a supply and take-up reel stand (not shown). A stun motor 17 and a pinch roller 18 which is freely contactable to and detachable from the capstan 6 and is in pressure contact with the capstan 16 when the magnetic tape 2 is running to clamp the magnetic tape 2 are provided. At this time, the pinch roller 18
Can move up and down so as not to affect the drawing of the magnetic tape 2. Further, when the capstan 16 makes one rotation, an FG pulse is output from the capstan motor 17, and the FG pulse has a function of controlling the feedback of the capstan motor 17 and calculating the remaining tape time as described later. ing.

Next, a system control unit 20 for controlling the entire operation of the magnetic recording / reproducing apparatus 10 uses a microcomputer or the like, and has a judgment function, a calculation function, tape loading members 11A and 11B, a rotating drum 12, a magnetic head, Control functions such as 13A and 13B are provided. The system control unit 20 includes a full erase head 14
Erasing circuit section 21 for supplying an erasing current to the tape, remaining tape time calculating section 22 for calculating the remaining tape time of supply reel 3, and inputting the audio signal in the program to AC head 15, Signal recording / reproducing unit 23 for recording on the magnetic tape 2 or reproducing the audio signal from the recorded magnetic tape 2
And a control signal recording / reproducing unit 24 for controlling a control signal to the AC head 15, and an FG pulse from the capstan motor 17 and a control signal from the AC head 15 to control the capstan 16 to a standard speed or a low speed. A capstan motor control unit 25 that rotates at a constant speed, a reservation memory 27 that stores program information input from a G code remote controller 30 described below via an infrared light receiving unit 26, and an infrared light receiving unit 26. A timer control unit 28 that monitors the broadcast time based on the received program information and the program information in the reservation memory 27 is provided in a wired manner as shown in the figure.

Next, the tape remaining time calculating unit 22, which is a part of the main part of the present invention, of the above-mentioned constituent members, when the tape cassette 1 is mounted, converts the magnetic tape 2 into the capstan 1
6 and a pinch roller 18, while running at a standard speed for a short distance, the number of slits of the slit disk 22 a rotating integrally with the supply reel 3 is determined by the rotation detector 2.
By measuring at 2b, one rotation of the supply reel 3 corresponding to the outer diameter of the magnetic tape 2 wound around the supply reel 3 is detected. On the other hand, by measuring the number of FG pulses of the capstan motor 17 generated during one rotation of the supply reel 3, the tape running amount per one FG pulse stored inside, the thickness of the magnetic tape 2 and the like can be measured.
The amount of travel of the magnetic tape 2 by the capstan 16 when the supply reel 3 makes one revolution can be calculated based on constants such as the diameter of the hub of the supply reel 3 and the like. The remaining tape time when the magnetic tape is fed at a standard speed is calculated from the outer diameter. Since the detailed calculation method of the remaining tape time is omitted, please refer to JP-A-59-77690.

The audio signal recording / reproducing unit 23, which is a part of the present invention, not only records / reproduces the audio signal in the program but also reproduces the signal based on the input program information. To record a program within the recording time on a magnetic tape at standard speed, the input audio signal in the program is automatically switched to a low speed from the middle of recording at standard speed when the remaining tape time is not enough. A speed switching permission voice signal detecting section 23a for detecting the speed switching permission voice signal S (FIG. 4) from the control signal is incorporated. The speed switching permission audio signal S is an essential part of the present invention.

In general, an input audio signal in a program is broadcast as a monaural audio signal, a stereo audio signal, or a bilingual audio signal. As shown in FIG. In stereo broadcasting and bilingual broadcasting at the time of broadcasting, there are a pilot signal for stereo broadcasting (982.5 Hz) and a pilot signal for bilingual broadcasting (922.5 Hz) transmitted while being AM-modulated. Accordingly, the speed switching permission audio signal detecting unit 23a built in the audio signal recording / reproducing unit 23 has determined that there is no pilot signal for stereo broadcasting (982.5 Hz) and no pilot signal for bilingual broadcasting (922.5 Hz). Sometimes, it is determined that the input audio signal in the program is a monaural audio signal and the system control unit 20 is informed. On the other hand, when there is a pilot signal (982.5 Hz) for stereo broadcasting, it is determined that the input audio signal is a stereo audio signal, and the system control is performed. When a pilot signal for bilingual broadcasting (922.5 Hz) is present, it is determined that the signal is a bilingual audio signal, and is notified to the system control unit 20, and these monaural audio signals, stereo audio signals, Speed change permission audio signal S for any state of the bilingual audio signal
(FIG. 4) and the system control unit 2 as described later.
The function of switching the magnetic tape 2 from the standard speed to the low speed via the line 0 is performed. In particular, as described later, when the input audio signal in the program is a stereo audio signal, it corresponds to a relatively insignificant commercial time zone in the program. (982.5Hz) to switch the magnetic tape 2 from the standard speed to the low speed as described below, but since some users value the image during the commercial time zone, the user is allowed to switch the speed in response to this A speed switching permission audio signal selection button (not shown) which can be set to any of a monaural audio signal, a stereo audio signal, and a bilingual audio signal as the audio signal S (FIG. 4);
The speed switching permission audio signal S (FIG. 4) may be extracted from the input audio signal (monaural audio signal, stereo audio signal, bilingual audio signal) of the program that the user has determined to be relatively insignificant.

Next, a description will be given of program information input means for inputting at least one or more pieces of program information for a plurality of programs broadcast from each broadcasting station. In this embodiment, the program information input means comprises a G code remote controller 30 provided separately from the magnetic recording / reproducing apparatus 10. This G
The code remote controller 30 simply inputs a program information with a 3 to 8 digit G code (program code) corresponding to a program broadcasted from a broadcast station, thereby obtaining a broadcast station name corresponding to one program and a day of the week. , The recording start time and the recording end time, and output them to the apparatus 10 as infrared light.

The G code remote controller 30 includes a numeric keypad 31 for inputting a G code, and a reservation button 32 for instructing the reservation memory 28 to reserve program information input in the G code.
And a recording mode button 33 (33a, 33b) for adding a standard recording mode or a low-speed recording mode slower than the standard recording mode (triple recording mode) to the program information input by the G code and the reserved program information, respectively. ) And an infrared light transmitting section 34 for outputting the content set by the G code remote controller 30 to the infrared light receiving section 26 of the magnetic recording and reproducing apparatus 10 as infrared light.
Are provided. Of course, there is a method in which program information input means having substantially the same function as that of the G code remote controller 30 is provided integrally with the magnetic recording / reproducing apparatus 10 side. In this case, electrical connection can be made without using infrared light. Good.

Next, as described above, the magnetic recording / reproducing apparatus 1
The system control unit 20 that controls the entire operation of the G.0 converts the recording time on the magnetic tape from the program information input from the G code remote controller 30 or the program information in the reservation memory 27 when recording in the standard recording mode. If the amount of recording time of the program calculated here is insufficient with respect to the remaining tape time of the supply reel 3 calculated by the remaining tape time calculating unit 22, A speed switching timing calculation for calculating a speed switching timing T (FIG. 4) for automatically switching to a low speed lower than the standard speed although the image quality is somewhat inferior when the recording cannot be performed at the standard speed and when the entire recording cannot be performed at the standard speed. The unit 20a is built in. At this time, the speed switching timing T is
Obviously, this is a speed switching point for recording the program at a standard speed as much as possible, recording the rest at a low speed and putting the entire program within the remaining tape time. Further, the system control unit 20 preferentially sets the standard recording mode when the recording mode is not set for the input program information, and sets the standard recording mode when the triple mode recording mode is set. In order to calculate the remaining tape time, the amount of tape used is converted into the recording time in the case of recording in the standard recording mode. At the time of recording, it is instructed to record in the triple recording mode as specified.

Further, based on the speed switching timing T (FIG. 4) calculated by the speed switching timing calculation unit 20a, the system control unit 20 provides a timing before the speed switching timing T up to the speed switching timing T. Speed switching permission period setting unit 2 for setting a speed switching permission period K within a predetermined time (for example, 15 minutes).
0b is built in. At this time, the speed switching permission period K
The predetermined time span is about 1 in commercial time zones such as commercial broadcasting
Since the broadcast is performed every five minutes, this interval is set.
Here, if the speed switching permission period K is not set,
In the commercial time zone near the start of recording of a program, the speed is switched from the standard speed to the low speed earlier, which is prevented. Then, the speed switching permission audio signal detecting section 23 in the audio signal recording / reproducing section 23 described above.
When the speed control permission period setting unit 20b detects that a stereo sound signal of, for example, a commercial time zone is detected as the speed change permission voice signal S (FIG. 4), the system control unit 20 lowers the magnetic tape 2 from the standard speed. The speed is automatically switched to the speed, in other words, the speed is automatically switched from the standard speed to the low speed before reaching the speed switching timing T (FIG. 4).

Next, the magnetic recording / reproducing apparatus 1 having the above configuration
0, to record a program within a recording time at a standard speed on a magnetic tape based on the input program information which is a main part of the present invention, when the tape remaining time is insufficient, the recording is performed at the standard speed. The operation of automatically switching to the low speed will be briefly described with reference to FIGS.

As shown in FIG. 3, in (step 1), the program in the system control unit 20 is started, and the amount of recording time on the magnetic tape is calculated based on the input program information or the program information in the reservation memory 27. Is determined to be insufficient for the remaining time of the tape on the supply reel 3.
Here, if the recording time amount based on the program information is within the remaining tape time, in step (2), if the standard recording mode is given priority or if the low-speed recording mode (triple recording mode) is specified, Recording is performed according to the recording mode.

On the other hand, if the amount of recording time is insufficient with respect to the remaining tape time, in step 3 the speed switching timing calculation unit 20a in the system control unit 20 sets the recording time within the remaining tape time. Recording is performed at the standard speed as much as possible, and when all the images cannot be recorded at the standard speed, a speed switching timing T for automatically switching to a low speed lower than the standard speed although the image quality is somewhat inferior is calculated. At the speed switching timing T, the speed is conventionally switched at the position shown in FIG.

Next, in (Step 4), the speed switching permission period setting unit 20b in the system control unit 20 determines the speed switching based on the speed switching timing T calculated by the speed switching timing calculation unit 20a. The speed switching permission period K is set within a predetermined time (for example, 15 minutes) before the timing T and before the speed switching timing T.

Next, in (Step 5), the magnetic tape 2
The video signal in the program is recorded by the magnetic head 13A for the standard recording mode, which runs at a standard speed while rotating with the rotary drum 12 while being sandwiched between the capstan 16 and the pinch roller 18, and simultaneously the program is recorded by the AC head 15. And the control signal for tape running control.

Next, in (Step 6), the system control unit 20 determines whether or not the speed switching permission period K has been reached when the program is being recorded on the magnetic tape 2 in the standard recording mode. When the speed switching permission period K has been reached, the process proceeds to (Step 7).

Next, in (Step 7), during the speed switching permission period K set by the speed switching permission period setting unit 20b in the system control unit 20, the speed switching in the audio signal recording / reproducing unit 23 is permitted. The audio signal detector 23a detects whether or not there is a speed switching permission audio signal S (FIG. 4) from the input audio signal. Here, it can be indirectly determined that the broadcast time is almost the commercial time zone by the stereo broadcast pilot signal (982.5 Hz) detected as the speed switching permission audio signal S (FIG. 4).

If no stereo broadcast pilot signal (982.5 Hz) is detected during the speed switching permission period K, it is determined in step 8 whether or not the speed switching timing T has been reached. If the speed switching timing T has not been reached, the process returns to (Step 6). If the speed switching timing T has been reached, the following operation (Step 9) is performed.

On the other hand, if the stereo broadcast pilot signal (982.5 Hz) is detected during the speed switching permission period K, the system control unit 20 immediately changes the magnetic tape 2 from the standard speed at step 9. The capstan motor control unit 25 is informed to automatically switch to the low speed, and the magnetic head 13A for the standard recording mode is switched to the magnetic head 13B for the low speed recording mode.

According to the above-described magnetic recording / reproducing apparatus 10 according to the present invention, when the program remaining within the recording time is recorded on the magnetic tape 2 at the standard speed based on the input program information, the remaining tape time is insufficient. When automatically switching to the low speed from the middle of recording at the standard speed, for example, a pilot signal for stereo broadcasting is detected as the speed switching permission audio signal S (FIG. 4) from the input audio signal in the program, and this stereo broadcasting is performed. The standard recording mode for recording the video signal in the program, because the magnetic tape 2 is automatically switched from the standard speed to the low speed in accordance with the relatively insignificant commercial time zone in the program by the pilot signal for Disturbance that occurs when switching from the magnetic head 13A for the low-speed recording mode to the magnetic head 13B for the low-speed recording mode is relatively unnoticeable. Performance of Waru magnetic recording and reproducing apparatus 10 can be improved. Of course, as described above, some users attach importance to the commercial time zone. Therefore, the input audio signal (monaural audio signal, stereo audio signal, bi-national audio signal) of the program determined to be relatively insignificant by the user. The speed switching permission voice signal S (FIG. 4) may be extracted from the word voice signal).

[0030]

According to the magnetic recording / reproducing apparatus according to the present invention described in detail above, the remaining tape time is not enough to record the program within the recording time at a standard speed on the magnetic tape based on the input program information. when to automatically switch from the middle of recording at the standard speed to the low speed in the absence, by detecting the input pilot signal for speed switching Patent Cassin No. as for example stereo broadcast from the audio signal in the program, for the stereo broadcast Since the pilot signal automatically switches the magnetic tape from the standard speed to a low speed in accordance with a relatively insignificant commercial time zone in the program, the magnetic tape for the standard recording mode for recording the video signal in the program is used. disturbance occurring when switching from the head to the magnetic head for low-speed recording mode Ri is no longer become relatively care, sex of the magnetic recording and reproducing apparatus according to the present invention It is possible to improve. Of course, as described above, some users attach importance to the commercial time zone, so the input audio signal (monaural audio signal, monaural audio signal,
A speed switching permission audio signal may be extracted from a stereo audio signal and a bilingual audio signal.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a magnetic recording / reproducing apparatus according to the present invention.

FIG. 2 is a diagram showing a stereo audio signal and a pilot signal included only in a bilingual audio signal in the magnetic recording / reproducing apparatus according to the present invention.

FIG. 3 is a flowchart showing a recording operation of the magnetic recording / reproducing apparatus according to the present invention.

FIG. 4 is a diagram showing a recording operation on a magnetic tape in the magnetic recording / reproducing apparatus according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tape cassette, 2 ... Magnetic tape, 3 ... Supply reel, 4 ... Take-up reel, 10 ... Magnetic recording / reproducing device, 15 ...
AC head, 16: capstan, 17: capstan motor, 18: pinch roller, 20: system control unit, 20a: speed switching timing calculation unit (speed switching timing calculation unit) 20b: speed switching permission period setting unit, 22 ... Tape remaining time calculating means (tape remaining time calculating unit), 23 ... Audio signal recording / reproducing unit, 23a ...
Speed switching permission voice signal detection unit, S: speed switching permission voice signal, T: speed switching timing.

Claims (1)

(57) [Claims] 1. A tape remaining time calculating means for calculating a remaining time of a magnetic tape, and a program information inputting means for inputting at least one or more pieces of program information for a plurality of programs broadcast from each broadcasting station. Comparing the remaining tape time calculated by the remaining tape time calculating means with the amount of recording time based on the input program information, and recording the program within the recording time at the standard speed on the magnetic tape. a speed switching timing calculation means for calculating the speed switching timing for switching the slower than normal speed low speed from the middle of recording at the standard speed when the tape remaining time is insufficient, the pre-Symbol magnetic tape from the standard speed to a low speed in the magnetic recording and reproducing apparatus and a speed switching means for automatically switching, the speed switching Patent No. Cassin based on audio mode of the input speech signal in said program A speed switching Patent Cassin No. detecting means for detecting a predetermined time before the speed switching timing the calculated
From the timing of
Setting means for setting the period of time to the speed switchable period.
Wherein the speed switching means, when detecting the speed switching Patent No. Cassin said speed switchable within the period, the detection
At the timing, the magnetic tape is automatically switched from the standard speed to the low speed, while the speed switching permission signal is
If not detected, the speed switching timing
Automatically cuts the magnetic tape from standard speed to low speed.
A magnetic recording / reproducing apparatus characterized in that it is replaced .