JP2002123988A - Tape recorder and its control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tape recorder and its control method that can attain sure high-speed program-search at reproduction of information even when the information is recorded in a high density recording mode. SOLUTION: In the case of recording e.g. a TV program in a 3-speed recording mode or 5-speed recording mode, the TV program is recorded only for e.g. 10 seconds in a standard recording mode, and the same program is recorded succeedingly in the 3-speed recording mode or the 5-speed recording mode, and high-speed program-search is conducted by using a CTL (control) signal recorded in the standard recording mode. That is, in the case of conducting the high speed program-search while reading the CTL signal, since the frequency of the CTL signal recorded in the standard recording mode that is clearly different from the frequency of the CTL signal recorded in the 3-speed recording mode or the 5-speed recording mode is detected for a prescribed time, sure program-search can be conducted, Furthermore, in the case of recording a program in the standard recording mode, only a head part of the program is recorded in the 3-speed recording mode or the 5-speed recording mode and then the same program is recorded while the recording mode is restored to the standard recording mode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a tape recorder for recording various information such as audio / video on a magnetic tape by a rotary head drum and a control method thereof.

[0002]

2. Description of the Related Art Conventionally, for example, in a video tape recorder apparatus of the VHS system, a signal for searching for a head is represented by:
Controls such as so-called VISS and VASS (CT
L) The signal was used. That is, when a TV program or the like is recorded, the CTL signal is subjected to a predetermined rearrangement or the like at the beginning of the recording and recorded, and the CTL signal is read at the time of reproduction to detect a cue. On the other hand, V
As the video tape recorder of the HS system, one having a triple recording mode in addition to the standard recording mode has been conventionally provided, and recently, one having a five-fold recording mode has been commercialized. Here, the triple recording mode is a recording mode in which the tape speed can be set to 1/3 of the standard and recording can be performed for 6 hours on a 2-hour tape, for example. /
5 is a recording mode in which recording can be performed for 6 hours on a 2-hour tape, for example. In any case, signals are recorded at a higher density than in the standard recording mode.

[0003]

However, when recording is performed in the triple recording mode or the five-fold recording mode as described above, the cue position is detected by reading the rearrangement of the CTL signal as described above. In such a system, when a high-speed cue search is performed during reproduction, a CT
There is a problem that rearrangement of the L signal cannot be reliably detected, and a proper cueing may not be performed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tape recorder and a control method therefor which can perform a reliable high-speed cue search when reproducing information even when information is recorded in a high-density recording mode. is there.

[0005]

According to the present invention, there is provided a tape recorder for recording information on a magnetic tape by a rotary head drum in a plurality of recording modes having different magnetic tape feed speeds. Recording mode setting means for setting one recording mode from:
When starting the recording of certain information, the recording mode is changed to the recording mode set to the recording mode set to the recording mode of a different feed speed, and recording is performed for a predetermined time, and then,
Recording control means for performing recording by returning to the recording mode set in the recording mode setting means. The present invention also provides a control method of a tape recorder for recording information on a magnetic tape by a rotating head drum, wherein when recording of certain information is started, a recording mode of a tape feeding speed different from a preset recording mode is set. The recording mode is changed to perform recording for a predetermined time, and thereafter, the recording mode is returned to the previously set recording mode to perform recording.

In the tape recorder of the present invention, the recording mode setting means sets one recording mode from among a plurality of recording modes having different feeding speeds of the magnetic tape. Further, in the recording control means, when recording of certain information is started, the recording mode is changed to a recording mode of a feed speed different from the recording mode set in the recording mode setting means, and recording is performed for a predetermined time, and thereafter, recording is performed. The recording is returned to the recording mode set in the mode setting means. As a result, only the leading area of the recording area of each information recorded on the magnetic tape is recorded at a tape feed speed different from the recording mode set by the recording mode setting means. Therefore, when a reproduction signal of a timing signal recorded on a magnetic tape at a constant time interval, such as a CTL signal in the VHS system, is considered, the reproduction is performed in the head area of each information recording area and the other areas. The frequency of the signal changes significantly, and the head of each information can be reliably detected from the change in the frequency. For this reason, even in a high-density recording mode such as a 3 × recording mode or a 5 × recording mode, it is possible to perform reliable cueing by a high-speed cueing search.

Similarly, in the control method of the tape recorder of the present invention, when recording of certain information is started, the recording mode is changed to a recording mode having a feed speed different from the recording mode set in the recording mode setting means. Then, the recording is performed for a predetermined time, and thereafter, the recording is returned to the preset recording mode. As a result, only the leading area of the recording area of each information recorded on the magnetic tape is recorded at a tape feeding speed different from the preset recording mode.
Therefore, when a reproduction signal of a timing signal recorded on a magnetic tape at a constant time interval, such as a CTL signal in the VHS system, is considered, the reproduction is performed in the head area of each information recording area and the other areas. The frequency of the signal changes significantly, and the head of each information can be reliably detected from the change in the frequency. For this reason, even in a high-density recording mode such as a 3 × recording mode or a 5 × recording mode, it is possible to perform reliable cueing by a high-speed cueing search.

The above-described tape recorder apparatus and control method according to the present invention relate to a cueing operation only for detecting the head of each piece of information, and read accompanying information such as an information number relating to each piece of information. Although such operations are not included, the recording and reproducing operations of the accompanying information can be realized by combining the method of the present invention with the conventional method.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a tape recorder and a control method thereof according to the present invention will be described. FIG. 1 is a block diagram showing an outline of a tape recorder according to an embodiment of the present invention, and FIG. 2 is a perspective view illustrating a recording area of a magnetic tape on which a control (CTL) signal is recorded by the tape recorder shown in FIG. FIG. FIG. 3 is an explanatory diagram showing a reading state of a CTL signal at the time of a high-speed cueing search of the tape recorder shown in FIG.

For example, in a VHS tape recorder, a pulse-like CTL signal is recorded at a fixed time interval along the longitudinal direction on the edge of the magnetic tape. For example, in the NTSC system, 30
CTL signals are recorded.
Five CTL signals are recorded. Also, the tape speed is reduced to 1/3 in the triple recording mode and to 1/5 in the 5x recording mode depending on the recording mode. In this case, a triple CTL signal is recorded, and in a five-times recording mode, a five-fold CTL signal is recorded.

Therefore, in the tape recorder of this embodiment,
For example, when recording a TV program in the triple recording mode or the fivefold recording mode, for example, recording is performed in the standard recording mode for only 10 seconds, and then the same program is recorded in the triple recording mode or the fivefold recording mode. This enables reliable high-speed search to be performed using a CTL signal for 10 seconds recorded in the standard recording mode. That is, CTL
When a cue search is performed at a high speed while reading out a signal, the CTL signal for 10 seconds recorded in the standard recording mode is clearly different from the CTL signal recorded in the triple recording mode or the quintuple recording mode. A signal can be detected for a certain period of time, and a reliable search can be performed. When recording a program in the standard recording mode, recording is performed in the triple recording mode or the quintuple recording mode only for the first part, and thereafter, the program is returned to the standard recording mode to record the same program. Good.

Next, the configuration of the tape recorder of the present embodiment employing the above-described head search recording method will be described with reference to FIG. As shown in FIG. 1, the tape recorder of the present embodiment includes a recording / reproducing mechanism unit 10, a servo circuit 20, a CTL detection circuit 30, a video / audio signal processing circuit 40, a control circuit 50, an operation unit 60. The recording / reproducing mechanism section 10 includes, besides the rotary head drum 12 and its driving system, a loading mechanism for the magnetic tape 14, a tape reel driving mechanism, a tape cassette insertion / ejection mechanism, and the like. It winds around the rotating head drum 12 by a scanning method, and records / reproduces video / audio signals on / from the magnetic tape 14. The servo circuit 20 is a control circuit for servo-controlling the recording / reproducing mechanism unit 10. In particular, in the present embodiment, the running system of the magnetic tape 14 and the rotating head drum 1
By controlling the second drive system, control is performed to selectively switch between the standard recording mode, the triple recording mode, and the five-fold recording mode for recording and reproducing the magnetic tape 14 at different recording densities.

The CTL detection circuit 30 is a circuit for detecting a CTL signal reproduced by the recording / reproduction mechanism unit 10 and outputs the detected CTL signal to the control circuit 50. The video / audio signal processing circuit 40 has an input terminal I
The video / audio signal input from N is subjected to predetermined signal processing and output to the recording / reproducing mechanism unit 10, and the video / audio signal reproduced from the magnetic tape 14 is subjected to predetermined signal processing and output from an output terminal OUT. Is what you do. The control circuit 50 controls the entire tape recorder device. In this embodiment, in particular, when recording a video / audio signal, the recording mode set by the user from the operation unit 60 at the start of recording each program. Is changed to a recording mode of a different feed speed, performs recording for a predetermined time (for example, 10 seconds), and then, the user operates the operation unit 6.
Control is performed so as to return to the set recording mode from 0 and perform recording.

When reproducing a video / audio signal, the CT
A high-speed cueing search is performed while monitoring the frequency of the reproduced signal of the L signal, and control is performed so that cueing detection is performed by detecting a change in the recording mode based on a change in the frequency. The operation unit 60 has operation keys for the user to make various inputs to the tape recorder, an LCD display panel for displaying the status of the tape recorder to the user, and the like. In the embodiment, the user performs an operation of setting a recording mode (standard recording, triple recording, and five-fold recording) during recording, and performs an operation of selecting a high-speed cue search during reproduction.

Next, a control method at the time of recording in the tape recorder of this embodiment will be described with reference to FIG. In the tape recorder of the present embodiment, when recording of a program is selected, at the start of the recording, the recording mode is changed to a recording mode having a feed speed different from the recording mode set by the user from the operation unit 60, and the recording mode is changed for a predetermined time (for example, Recording is performed only for 10 seconds), and thereafter, control is performed so as to return to the recording mode set by the user from the operation unit 60 and perform recording. For example, if the standard recording mode is set by the user, the head of the program is recorded in the triple recording mode for only 10 seconds, and then the mode is returned to the standard recording mode and the subsequent part of the program is recorded. . When the triple recording mode is set by the user, the head portion of the program is recorded for 10 seconds in the standard recording mode, and thereafter, the recording is performed for 3 seconds.
Returning to the double recording mode, the subsequent part of the program is recorded.
If the user has set the five-time recording mode, the head of the program is recorded in the standard recording mode for only 10 seconds, and then the mode is returned to the five-time recording mode to record the subsequent part of the program. Do.

When recording is performed in this manner, recording areas 141, 1 and 1 for each information (program) to be recorded on the magnetic tape 14 are recorded.
Only the first areas 141A and 142A of the 42 are recorded at a tape feed speed different from the recording mode set by the user. Therefore, the CTL signal recorded on the edge portion of the magnetic tape 14 at a fixed time interval corresponds to the head area 14 of the recording areas 141 and 142 of each information (program).
1A, 142A and the other areas 141B, 142B are recorded at greatly different frequencies.

Next, a control method at the time of high-speed cueing search in the tape recorder of the present embodiment will be described with reference to FIG. In FIG. 3, the horizontal axis represents time, and the vertical axis represents the detection frequency of the reproduced signal of the CTL signal. In the tape recorder of this embodiment, when the high-speed cueing search is selected, the control circuit 60 monitors the reproduction signal of the CTL signal while sending the magnetic tape 14 at a high speed, and monitors the change in the frequency. Detect. Then, when there is a portion where the detection frequency of the reproduction signal of the CTL signal greatly changes, this portion can be determined as the head region of each program, and the start can be performed.

For example, FIG. 3 shows a case where the recording mode is set to the five-fold recording mode, and only the first areas 141A and 142A of the respective programs (program 1 and program 2) are recorded in the standard recording mode. In this case, the magnetic tape 140 is used as the head area 141A, 14A of the recording area 141, 142 of each program.
At 2A, the frequency of the CTL signal recorded in the standard recording mode is one fifth of the frequency recorded in the other areas 141B and 142B. Therefore, since such a large change in frequency can be clearly determined even during high-speed reproduction, the control circuit 60
The head areas 141A and 142A of each program can be clearly recognized, and reliable cueing can be performed. Although the operation of detecting the head of each information is described here,
The point is that a reliable search can be performed by the above-described method. For example, by combining the method according to the present embodiment with a conventional search method such as so-called VISS or VASS, at the time of high-speed search, the present embodiment can be used. Searching may be performed by a method, and thereafter, the tape feed speed may be reduced, and so-called meta information (associated information) such as a program number may be detected by a conventional method.

As described above, according to the tape recorder apparatus and the control method of the present embodiment, even when a program is recorded in the high-density recording mode, a reliable high-speed search can be performed when the information is reproduced. Even when a large number of programs are recorded in a recording mode capable of recording for a long time, it is possible to quickly and reliably search for a program and to provide a user-friendly tape recorder device. In addition, there is an advantage that reliable cueing can be performed without adding a new component, and the cost can be increased without increasing the cost. It should be noted that the present invention provides a VHS for recording and reproducing the CTL signal as described above using a fixed head.
The present invention is not limited to the system or the beta system, and can be applied to an 8 mm video or a DV format video in which a pilot signal is recorded and reproduced by a head of a rotating head drum for tracking. Further, even in such a tape recorder having no CTL signal at the tape edge, for example, 8 mm video or DV format video, the same control can be performed using a timing signal such as a pilot signal capable of checking a recording pitch. It is possible. Further, in the above-described example, the example of the video tape recorder apparatus that records and reproduces a video / audio signal has been described. However, the present invention is not limited to this, and can be widely applied to a tape recorder apparatus that records and reproduces various information. Things.

In the above-mentioned control method, the recording mode can be selected by, for example, recording the head portion in the standard recording mode when the recording is performed in the 5 × recording mode. (Frequency) is increased by a factor of five, and cueing can be performed more reliably.
On the other hand, for example, when recording is performed in the 5 × recording mode,
If the first part is recorded in the triple recording mode, the difference in recording density (detection frequency at the time of search) is reduced to 5/3 times, but the servo operation is faster in the part where the tape speed is changed. And smooth control. Therefore, the recording mode may be selected depending on whether the emphasis is on the reliability of the cue or on the smoothness of the servo.

[0021]

As described above, in the tape recorder according to the present invention, when recording of certain information is started, the recording mode is changed to a recording mode having a feed speed different from a preset recording mode for a predetermined time. Only after recording, and then returning to the preset recording mode to perform recording. Therefore, the frequency of the reproduction signal of the timing signal recorded on the magnetic tape at fixed time intervals greatly changes between the head area of the recording area of each information and the other areas. Can be reliably detected. For this reason, even in the high-density recording mode, it is possible to reliably perform the cueing by the high-speed cueing search.

Similarly, in the control method of the tape recorder apparatus according to the present invention, when recording of certain information is started, the recording mode is changed to a recording mode having a feed speed different from a preset recording mode for a predetermined time. Only after recording, and then returning to the preset recording mode to perform recording. Therefore, the frequency of the reproduction signal of the timing signal recorded on the magnetic tape at fixed time intervals greatly changes between the head area of the recording area of each information and the other areas. Can be reliably detected. For this reason, even in the high-density recording mode, it is possible to reliably perform the cueing by the high-speed cueing search.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an outline of a tape recorder device according to an embodiment of the present invention.

FIG. 2 is a perspective view illustrating a recording area of a magnetic tape on which a control (CTL) signal is recorded by the tape recorder shown in FIG.

FIG. 3 is an explanatory diagram showing a reading state of a CTL signal at the time of a high-speed cueing search of the tape recorder shown in FIG. 1;

[Explanation of symbols]

Reference numeral 10: recording / reproducing mechanism unit, 12: rotating head drum, 14: magnetic tape, 20: servo circuit, 30:
... CTL detection circuit, 40 ... Video / audio signal processing circuit,
50: control circuit, 60: operation unit.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D077 AA08 BA04 BA15 CA02 DC21 DC40 DD14 DE05 5D104 AC01 AD12 MH01 MH05 MK04 ML04 ML12

Claims (10)

[Claims] 1. A tape recorder for recording information on a magnetic tape by a rotating head drum, a recording mode setting means for setting one recording mode from a plurality of recording modes having different magnetic tape feed speeds, When starting the recording of certain information, the recording mode is changed to the recording mode set to the recording mode set to the recording mode of a different feed speed, and recording is performed for a predetermined time, and then,
Recording control means for performing recording by returning to the recording mode set in the recording mode setting means. 2. A tape recorder according to claim 1, further comprising a reproduction control means for detecting a cue by detecting a change of a recording mode by said recording control means when reproducing said magnetic tape. . 3. The reproduction control means detects a timing signal recorded on a magnetic tape at a fixed time interval during recording on the magnetic tape, and detects a change portion of the recording mode from a change in the detected frequency. 3. A tape recorder according to claim 2, wherein: 4. The tape recorder according to claim 3, wherein the timing signal is a control signal recorded on an edge of the magnetic tape by a fixed head. 5. A high-speed cueing search, wherein the reproduction control means detects cueing by detecting a change position of a recording mode by the recording control means, and then lowers a magnetic tape feed speed. 4. A tape recorder according to claim 3, wherein said recording control means performs an operation of reading attached information recorded on a magnetic tape. 6. A control method of a tape recorder for recording information on a magnetic tape by a rotating head drum, wherein when recording of certain information is started, a recording mode of a tape feeding speed different from a preset recording mode is set. A method for controlling a tape recorder device, wherein recording is performed for a predetermined time after being changed, and thereafter, the recording is returned to the previously set recording mode. 7. The control method for a tape recorder device according to claim 6, wherein a cueing detection is performed by detecting a change position of the recording mode when reproducing the magnetic tape. 8. When reproducing the magnetic tape, a timing signal recorded on the magnetic tape at regular time intervals during recording on the magnetic tape is detected, and a change in the recording mode is detected from a change in the detected frequency. 7. The control method for a tape recorder according to claim 6, wherein: 9. The method according to claim 8, wherein the timing signal is a control signal recorded on an edge of the magnetic tape by a fixed head. 10. In a high-speed cueing search, after cueing detection is performed by detecting a change portion of the recording mode, the magnetic tape feed speed is reduced,
9. The control method for a tape recorder according to claim 8, wherein an operation of reading attached information recorded on said magnetic tape is performed.