JP3099394B2 - Video tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video tape recorder having a timer recording function.

[0002]

2. Description of the Related Art Conventionally, VTR (Video Tape Recorder)
Timer recording is a common means of recording
Before inputting the information to be recorded, set the channel, recording start time and end time, insert the magnetic tape to record, and turn on the timer recording switch at the end. Is started by VTR
It is an indispensable function for.

Further, as a first means for retrieving recorded information, there is a method of recording a cue signal by modulating a duty ratio of a servo control signal at the beginning of information to be taken out from a magnetic tape. This is a VHS standard VISS search function, which is the mainstream of home half-inch VTRs, and is called fast forward / rewind (FF / R).
Cue signal (VISS signal) in the EW state)
Is detected and the state is shifted to the stop state or the reproduction state. The second means is a counter search function using a linear time counter function for displaying a count value of a servo control signal. In the FF / REW state, a counter value corresponding to the beginning of information to be taken out from the magnetic tape is obtained. If it is, it is shifted to the stop or playback state.

[0004]

When timer recording is performed by the above-described method, first, there is a complicated key input operation. For this purpose, a simple reservation method using barcodes and voice recognition has recently been devised, but it is not yet sufficient and cannot be used especially by the elderly and young people. Second, there is a convenient function such as timer reservation (hereinafter referred to as daily reservation or weekly reservation) for recording the same program at the same time every day or every week, but the number of programs that can be reserved is limited and used by a plurality of persons. In some cases, it is not enough, and others may cancel the reservation or change the contents. In addition, recording such as daily reservation or weekly reservation is originally intended to be recorded on the same tape and to be continuously played back and enjoyed later, but this is not easy with a conventional VTR.

Further, when recording the next program on a tape which has been recorded once but has not been reproduced, it is not immediately known where to record. Therefore, in order to avoid erroneous erasure, the tape is reproduced to find a recording end position. Needed.

When searching for information recorded on a magnetic tape, first, since the current absolute position of the magnetic tape is unknown in any case, it is necessary to rewind the magnetic tape to the beginning before searching. There is a problem that information to be searched cannot be obtained quickly. Secondly, in order to remember what was recorded on the magnetic tape, index information such as a title and the count value in the case of the counter search function are stored, or the magnetic tape is stored in a label or the like. Must be attached to a cassette that is
Furthermore, in order to avoid forgetting to read or erroneously erasing the information recorded for the above-mentioned reasons, only one piece of information is often recorded on one tape, which reduces the tape use efficiency.

[0007]

According to the present invention, there is provided a VTR comprising: cassette identification means for identifying an inserted cassette; information acquisition means for inputting or collecting index information relating to information to be recorded; Memory means for storing information from the cassette identifying means and the information obtaining means, writing means for writing the information into the memory means, and an index from the memory means based on the cassette identification information from the cassette identifying means. There is provided a reading means for reading information, and a means for automatically setting a timer reservation recording based on the index information read by the reading means only by inserting the cassette.

A tape position detecting means for detecting a winding position of the magnetic tape housed in the cassette;
The memory means also stores the position detection information from the tape position detection means, and the recording on the magnetic tape is performed based on the index information and the tape position information read by the reading means only by inserting the cassette at the time of recording. A means is provided for automatically searching and recording possible positions.

Means for storing the reproduced information in the memory means when the recorded information on the magnetic tape is reproduced, and means for judging the recorded portion and the unrecorded portion of the reproduced information as recordable position portions. Is provided.

[0010] Further, there is provided means for searching for and reproducing the oldest program of the recording date in the unreproduced recording information.

[0011]

According to the present invention, each of the plurality of cassette tapes is specified by the above-described configuration, and when the timer reservation recording is set first, the cassette tapes are set to the VTR.
The recording start position can be automatically searched simply by inserting the program into the timer, the timer recording can be set, and the oldest recorded program can be reproduced from the unreproduced information.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of one embodiment of a VTR according to the present invention. A cassette 1 for storing a magnetic tape 2 and a rotary head (not shown) for recording and reproducing information on the magnetic tape 2 are attached. Rotating drum 3,
A supply-side reel (hereinafter, referred to as an S-reel) 4 for sending out the magnetic tape 2 during reproduction or fast-forward, a winding-side reel (hereinafter, referred to as a T-reel) 5 for winding the magnetic tape 2 during reproduction or fast-forward, A supply-side reel rotation speed detector (hereinafter, referred to as an S-reel rotation speed detector) 6 for detecting the rotation speed of the S-reel 4 and a winding-side reel rotation speed detector (hereinafter, referred to as an S-reel rotation speed detector) , A T-reel rotation speed detector) 7, a control head 8 for recording and reproducing servo control signals, a bar code 9 for recognizing the cassette 1, a bar code reader 10 for reading the bar code 9, and A control signal recording / reproducing circuit 12 for writing / reading a cue signal to / from the magnetic tape 2 via the control head 8;
A tape drive circuit 13 for driving a capstan motor (not shown) or a reel motor (not shown) for transferring the magnetic tape 2 in accordance with the W state, the reproduction state, etc., and timer reservation and VTR operation The key input device (or remote control device) 14 and the like, index information and tape remaining amount information relating to information to be recorded together with the barcode information detected by the barcode reader 10 at the time of information recording are stored. ) Backed up by static random access memory (hereinafter,
An on-screen display circuit (hereinafter referred to as an OSD circuit) 1 for displaying index information stored in the SRAM 15 when necessary.
6, a video signal processing circuit 17, a monitor 18, and a microcomputer 11 for controlling the above system.

The operation of the above-described component VTR will be described below. FIG. 2 is a perspective view showing a state in which the cassette 1 is inserted into the VTR main body 20, and the magnetic tape 2, that is, a bar code 9 which is put on the side of the cassette 1 when the cassette 1 is inserted into the VTR, is a bar code. By reading with the reader 10, first, the microcomputer 11 recognizes which cassette has been inserted. That is, since the cassette 1 is marked with the bar code 9 encoding the cassette number, the cassette can be specified by decoding the bar code.

At the time of recording, the microcomputer 11 sends the cassette number, index information about the information to be recorded, and the remaining tape information at the start of recording to the SRA.
It is stored in M15. The index information is information on the stored information such as the recording date, recording start and end times, the channel number of the tuner, and the title, which can be recognized later, and information on the presence / absence of daily or weekly reservation. The tape remaining amount information is for storing where information to be recorded is recorded on the tape, and is obtained, for example, by measuring the rotation period of the S reel 4 and the rotation period of the T reel 5. For example, it is the remaining time of the tape from the recording start position to the end of the tape.

FIG. 3 is an enlarged view of the cassette 1 shown in FIG.
FIG.
An embodiment of the method for detecting the remaining time of the tape will be described.
You. In FIG._tIs the traveling speed of the magnetic tape 2 [m
/ S], and r is the radius of the hub of the S reel 4 and the T reel 5.
[M], R_sAnd R_tIs S reel 4 and T reel respectively
5, radius [m] to the outer circumference of the magnetic tape wound around S
_sAnd S_tIs wound on S reel 4 and T reel 5, respectively.
Area including the magnetic tape 2 and reel hub
[M ^Two], Ω_sAnd ω_tAre S reel 4 and T reel respectively
Angular velocity [rad / s] of the robot 5.

The angular velocities ω _s and ω _t can be obtained by measuring the period of the rotation speed detection signal detected by the S reel rotation speed detector 6 and the T reel rotation speed detector 7. Therefore, the radii R _S and R _t up to the outer circumference of the magnetic tape wound on the S reel 4 and the T reel 5 are R
the _{s = V t / ω s,} R t = V t / ω t. Therefore, it corresponds to the length of the magnetic tape 2 wound on the cassette 1.
The total area S of the tape including the reel hub is S = S _s + S _t =
π (R _S ² + R _t ² ). By the way, there are several types of lengths of the magnetic tape 2 wound around the cassette 1. For example, in the VHS standard described above, a 120-minute tape, a 90-minute tape,
There are 60-minute tape, 30-minute tape and the like. Therefore, the total area of the tapes S ₁₂₀ , S ₉₀ ,
S _60, S _{3 0} cassette 1 inserted in the now VTR if seeking can detect how many minutes tape. Based on the result, the tape area S _so including the reel hub on the S reel side is obtained again. For example, if the detection result is a 120-minute tape, S _so is expressed as S _so = S ₁₂₀ × ω _t ² / (ω _s ²
+ Ω _t ² ). Then, by dividing the net tape area excluding the area of the reel hub by the tape thickness τ [m], the remaining tape amount L [m] is obtained, and the remaining tape amount L [m] is determined by the tape speed V _t [m / S]. By dividing, the remaining time T [s]
Can be calculated. That is, L = (S _so −π _r ² ) / τ, T =
The remaining tape information is obtained by calculating the L / V _t.

Further, the microcomputer 11 controls the control signal recording / reproducing circuit 1 shown in FIG.
2, a so-called VISS signal obtained by modulating a control signal with a duty ratio is recorded on the magnetic tape 2.

FIG. 4 shows a recording waveform of a control signal, a reproduction waveform, and a recording format of a cue signal for explaining a VISS search function for performing cueing by modulating a control signal with a duty ratio. When one cycle is 100%, a signal having a high level period of about 60% (FIG. 4A) is a "0" pulse, and a signal having a high level period of about 27.5% (FIG. 4A).
(B)) is set to a “1” pulse, and a cueing code as shown in FIG. 4C is recorded at the start of the recording, that is, at the beginning of the program to be recorded. In the VISS search, the cueing code is detected by measuring the duty ratio of the reproduction control signal at the time of fast forward or rewind, and the mode is shifted to the reproduction mode.

The above operation is performed for each series of recording operations, that is, the cassette number, index information, and remaining tape information are stored in the SRAM 15 for each program (hereinafter, referred to as a program), and the cue signal is output. The information is recorded on the magnetic tape 2. Of course, if another cassette is inserted, the cassette number corresponding to the bar code marked on that cassette is stored.

FIG. 5 is a map diagram of cassette numbers, index information, and remaining tape information stored in the SRAM 15. The horizontal axis indicates the lower address (4 bits).
The vertical axis represents the space with the upper address (7 bits). Then, as shown by 151, 152 and 153 in FIG. 5, for each program to be recorded on the tape, 1 byte for the cassette number, 1 byte for the channel, 3 bytes for the recording date, 2 bytes for the recording start time, Two bytes are used for the recording end time, two bytes are used for the remaining time at the start of recording, one byte is used for daily or weekly reservation setting, and four bytes are used for the title and the like. In the case of FIG. 5, the total memory capacity is 16K (16
384) bits, and up to 128 programs can be stored. By the way, recording of a VTR is roughly classified into normal recording and timer recording. In particular, in the case of timer recording, a timer microcomputer (not shown) is used not when the timer is reserved but when the recording is actually started and the time is up. The index information stored in the microcomputer 11 is received by the microcomputer 11 and written into the SRAM 15. In other words, this is to prevent a malfunction when a timer is reserved but not recorded for some reason.

In the case of daily or weekly reservation, the second and subsequent records, that is, in the case of daily reservation, from the record of the next day,
In the case of weekly reservation, timer recording is automatically set from the recording of the next week simply by inserting the cassette used at the time of the first setting into the VTR. That is, the microcomputer 11 reads the bar code 9 indicating the cassette 1 inserted in the VTR, reads the index information corresponding to the cassette number from the SRAM 15, and confirms that the cassette is set for daily or weekly reservation. When it is recognized, the timer recording reservation is set in the timer microcomputer based on the index information. FIG. 6 is a schematic diagram for explaining how the magnetic tape 2 stored in the cassette reserved daily or weekly is recorded, and FIG.
A tape with a cassette number of "3", reserved for 6 channels every week from 8:00 pm to 9:00 pm on Tuesday, January 1, 2001, first of which a normal timer recording is executed and the "a1" portion Be recorded. And for the recording of the next week, 199
When a tape with cassette number “3” is inserted into a VTR by 8:00 pm on Tuesday, January 8, 2001, the SR
The tape position is automatically adjusted to the end point (point a) of “a1” based on the index information and the remaining tape information stored in the AM 15. At this time, when the cue signal by the control signal described above is recorded at the end of recording when recording the portion of "a1", the end point of "a1" (a
Point) detection accuracy can be improved. And 19
Recording started at 8:00 pm on Tuesday, January 8, 1991,
As shown in FIG. 6A, the data is recorded in the portion "a2". In the same manner, the next week is recorded in the section "a3". FIG. 6B shows a tape with a cassette number of “7” for which 8 channels are reserved every day from 1:00 pm to 2:00 pm on Thursday, January 3, 1991, and a normal timer recording is first performed. It is recorded in the part “b1”. For the next day's recording, the tape with cassette number "7" was VTR-recorded by 1:00 pm on Friday, January 4, 1991.
, The tape position is automatically searched for the end point of “b1” based on the index information and the remaining tape information stored in the SRAM 15 and recorded in “b2”.
Hereinafter, similarly, “b3”, “b4”,..., “B7” are recorded, and the recording on January 10 can be overwritten if there is a recording section to which reproduced information described later is added. . That is, if the "b1" portion has been reproduced by this point, the program from 1:00 pm on Thursday, January 10 is automatically recorded in the "b1" portion.

Here, the daily recording and the weekly recording in which the timer recording is periodically performed have been described. However, even in the case of the normal aperiodic timer recording, a plurality of timer recording settings are first set. Thus, the timer reservation can be set by simply inserting the cassette.

A case where the tape recorded as described above is reproduced will be described below. First, when the cassette 1 is inserted into the VTR, the microcomputer 11 first recognizes which cassette has been inserted by reading the bar code 9 marked on the side surface of the cassette 1 by the bar code reader 10 in the same manner as during recording. . Then, the index information corresponding to the detected cassette number is read from the SRAM 15, and the video signal processing circuit 1
7 is displayed on the monitor 18 screen. FIG. 7A shows an example of the display. In this case, the cassette number inserted into the VTR is "5", and a total of five programs (programs) are currently recorded on this tape. The program of program number 1 is a 6-channel movie theater recorded at 9:00 pm on October 20, and the program of program number 2 is a 10-channel drama recorded at 7:00 pm on October 25. I have. FIG. 7B shows a second display example. In this case, the cassette number inserted into the VTR is "7", and a total of six programs (programs) are recorded on the above-mentioned tape reserved daily. It indicates that. After selecting the program number on the screen of the monitor 18 by the operation keys 14, when the VTR is set to the reproduction mode, the program selected by the software program incorporated in the microcomputer 11 is searched and then automatically reproduced. State. Also,
In the case of the tape of the cassette number "7" for which the above-mentioned daily reserved recording is set, the cassette is simply inserted and the index information, that is, the recording date and the reproduction described later will be described by the software program incorporated in the microcomputer 11. It is also possible to automatically search for the oldest program of the recording date among the unplayed programs on the basis of the completed information and set the program to the playback state. If the cassette is not inserted or if it is desired to search the contents of a cassette different from the inserted one, the cassette identification information can be input from the outside with the key input device 14 or the like. When the cassette 1 is inserted after the information is displayed on the screen of the monitor 18 in the same manner as in FIG. 7 and the program is selected, the selected program is searched for by the software program incorporated in the microcomputer 11 and automatically. The playback state is set. The above operation will be described with reference to the flowchart of the software program incorporated in the microcomputer 11 shown in FIG.

First, at processing block 111,
The tape remaining amount is detected in the same manner as described for recording, and the current tape position is detected. Next branch 112
Detected during recording of the program selected in the SRAM 15
Time remaining in the tape and the processing block 111
Compares the current tape remaining time detected in
As a result, if the current position is 10 minutes or more before the target position, the processing shifts to processing block 113, where the VTR is set to the fast-forward (FF) state, and the current position is shifted by 10 to the target position.
If it is more than one minute later, the processing moves to processing block 114 and the VTR
In the rewind (REW) state, and the respective processing blocks 1
Return to 11. If the current position is within 10 minutes of the target position, the processing shifts to processing block 115, where the VTR is set to the above-described VISS search state, and when the start code of the selected program is detected, the processing block 116 sets the VTR to the reproduction mode. A series of search operations is completed. That is, the position where the program is recorded is roughly detected by the tape remaining amount detection function, and then detected with high accuracy by the VISS search function. Finally, in the processing block 117, the reproduction completed flag set in the index information in the SRAM 15 corresponding to the program searched and reproduced is set.
Then, when the recorded program shown in FIG. 6 is displayed, a reproduced mark is displayed (not shown) according to the flag, so that when the same cassette is later inserted, the unreproduced program is identified at a glance and recorded. It is also possible to easily prevent the user from forgetting to view the program or erroneously deleting the program.

As described above, according to the video tape recorder of the embodiment of the present invention, at the time of recording, a cassette is specified by a barcode, index information such as cassette number, date, time, channel, title, etc., and each program is recorded. The position information is stored in the SRAM, and VI is added to the beginning of each program on the tape.
Record the SS signal. In the case of timer reserved recording, a reservation is set by a timer microcomputer, the reservation index information is stored in the SRAM by the microcomputer, the cassette is identified, and the timer reserved recording is performed according to the reservation program of the corresponding cassette in the SRAM. At the time of reproduction, the cassette is identified by a barcode, and the corresponding index information is read from the SRAM and displayed on the monitor. Enter the desired playback program number from the key input device,
The current position of the tape is compared with the head position of the desired program stored in the SRAM, and the head is roughly searched by an FF or REW operation, and finally the desired head selected by the VISS search is accurately searched. It is arranged to be. And the SR corresponding to the accessed program
Since the reproduced flag is arranged to be written in the index information in the AM, the desired program can be automatically accessed and promptly reproduced by inputting a key while looking at the monitor display. You can see at a glance.

In this embodiment, the tape position detecting means is realized by a tape remaining amount detecting function and a VISS search function. For example, a time code or the like is superimposed on a control signal or a video signal to be recorded and reproduced during reproduction. The tape position may be detected by detecting a time code or by counting a control signal from the beginning of the tape winding.

In the case of over-recording on a recorded tape, the microcomputer 11 records the remaining tape time at the start of recording and the recording end time of the over-recorded program among all the programs registered under the cassette number. By erasing all index information and remaining tape information of a program having a remaining tape time during the remaining tape time at the time of the search, it is possible to prevent a search from malfunctioning and to reduce the
Can be used more efficiently.

In general, a VTR has a plurality of recording time modes, but the above-described remaining tape detection time is converted into a long time recording mode in any recording time mode to prevent a malfunction in retrieval. be able to.

[0029]

As is clear from the above embodiments, according to the present invention, not only the disadvantages of the VTR's biggest problem of the timer reservation recording setting operation and the access operation, but also the magnetic tape can be improved. It is also possible to improve the efficiency of use. Further, since the same program can be recorded on the same tape and automatically reproduced in order from the unreproduced one, it is possible to provide a video tape recorder capable of preventing forgetting to see or erroneous erasure.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a video tape recorder according to one embodiment of the present invention.

FIG. 2 is a perspective view showing a state where the cassette is inserted into the VTR main body of the embodiment.

FIG. 3 is an enlarged view of a cassette part of the embodiment.

FIG. 4 is a recording format diagram of a control signal recording waveform, a reproduction waveform, and a cue signal for explaining a VISS search function of the embodiment.

FIG. 5 is a map diagram of cassette numbers, index information, and remaining tape information stored in the SRAM of the embodiment.

FIG. 6 is a schematic diagram for explaining how a magnetic tape stored in a cassette reserved daily or weekly according to the embodiment is recorded.

FIG. 7 is a schematic diagram of a monitor screen display example of the embodiment.

FIG. 8 is a flowchart of a software program incorporated in the microcomputer of the embodiment.

[Explanation of symbols]

 Reference Signs List 1 cassette 2 magnetic tape 4 supply reel 5 take-up reel 6 supply-reel rotation speed detector 7 take-up reel rotation speed detector 8 control head 9 barcode 10 barcode reader 11 microcomputer 12 control signal recording / reproducing circuit 13 Tape drive circuit 14 Key input device 15 SRAM 16 On-screen display circuit 17 Video signal processing circuit 18 Monitor

────────────────────────────────────────────────── ─── Continuation of the front page (72) Yoshikazu Kageyama, Inventor 1006 Odakadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-2-278588 (JP, A) JP-A-63- 237244 (JP, A) JP-A-1-205750 (JP, A) JP-A 1-285049 (JP, A) JP-A-62-192950 (JP, A) (58) Fields investigated (Int. Cl. ^7, DB name) G11B 15/02 G11B 27/10 H04N 5/782 - 5/783

Claims (3)

(57) [Claims] 1. A video tape recorder having a timer recording function, comprising: a cassette identifying unit for identifying an inserted cassette; an information acquiring unit for inputting or collecting index information on information to be recorded; Means, memory means for storing information from the information obtaining means, writing means for writing the respective information to the memory means, and reading out the index information from the memory means based on cassette identification information from the cassette identification means. A video tape recorder comprising: a reading unit; and a unit for automatically setting a timer recording based on the index information read by the reading unit only by inserting the cassette and executing the timer recording. 2. A video tape recorder having a timer recording function, comprising: cassette identification means for identifying an inserted cassette; information acquisition means for inputting or collecting index information relating to information to be recorded; Tape position detecting means for detecting a winding position of a stored magnetic tape; memory means for storing information from the cassette identifying means, the information obtaining means, and the tape position detecting means; Writing means for writing to the memory means, reading means for reading the index information and the tape position information from the memory means based on the cassette identification information from the cassette identification means, and inserting the cassette at the time of recording. The index information read by the reading means and the text Means for automatically searching a recordable position on a magnetic tape based on tape position information, automatically setting timer recording, and executing timer recording. 3. A cassette for identifying an inserted cassette.
Identification means and index information for the information to be recorded
Information acquisition means to be input or collected, and
Tape that detects the winding position of the contained magnetic tape
Position detecting means, the cassette identifying means, and the information acquisition
Means for storing information from the tape position detecting means.
Memory means; and
Writing means for writing to the column and the cassette identification means
Based on the cassette identification information.
Reading the index information and the tape position information.
Ejecting means and the tape stored in the memory means
Position information and the current tape by the tape position detecting means
Compare location information and fast forward / rewind based on the result
After performing, the cue signal is detected and the cue of the recorded information is performed.
Program search means to be executed, and inserting the cassette
Only based on the reproduced information and the index information
Before the oldest program of the recording date in the unplayed recording information
Automatically search by program search means and play state
And a video tape recorder.