JPH0660621A - Video tape recorder - Google Patents

Abstract

PURPOSE:To realize accurate heading of program by a constitution wherein date and tape position are recorded on a tape at the time of recording, recording day, starting/ending times, channel position, and the like are stored in a memory, residual amount of tape is compared at the time of retrieval and retrieving direction is determined. CONSTITUTION:At the end of recording operation, start and end positions of a new program are compared with those stored in an E<2>PROM 3 and the data are written in while being rearranged. When a magnetic tape 11 is loaded, data are read out therefrom and passed through an OSD circuit 5 and a signal processing circuit 6 to be displayed on a monitor 7. A program is then retrieved, and residual amount of tape is compared based on the ratio of rotational period of a reel thus determining the traveling position of tape. A microcomputer 1 commands a drive circuit 9 to quick feed the tape. The tape is run upto a position of a program to be retrieved. This constitution realizes accurate heading of program.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to program search in a video tape recorder.

[0002]

2. Description of the Related Art A conventional video tape recorder (hereinafter referred to as VTR) will be described below.

In recent years, in the VTR program search, a barcode is attached to the cassette tape to identify the cassette tape, and the information of the program recorded on the cassette tape is stored in a memory incorporated in the VTR to find out the remaining tape amount and the beginning of the tape. First, using the signal, the current tape remaining amount value is compared with the tape remaining amount value of the program to be stored in the memory, and the cue signal is detected when the position is approximately 5 minutes before and after the program start position. There is a method to automatically cue.

[0004]

However, in the above-mentioned conventional method, since the detection accuracy of the remaining tape value is rough, when a program with a recording time of about 10 minutes or less is cued, the next program is erroneously cued. There is a problem in that if a cue signal of a program that should have disappeared due to overwriting is left, the cue signal of the program that has disappeared by mistake is cued.

The present invention solves the above problems and provides a video tape recorder capable of accurately locating a recorded program.

[0006]

In order to solve this problem, a VTR of the present invention comprises a storage means for storing index information of a recorded program and recording start tape position information, and a writing means for writing information in the storage means. , Read-out means for reading out information from the storage means, display means for displaying the information read out from the storage means, recording means for recording tape position information and current time at the time of recording on the tape, and reproduction A reproducing means, a first comparing means for comparing the recording start tape position information stored by the storing means with the tape position information obtained by the reproducing means, and a recording start time included in the index information and a recording obtained by the reproducing means. It is provided with a second comparing means for comparing the internal time and a control means for performing a program search based on the results of the two comparing means.

[0007]

With the above configuration, the VTR of the present invention records the recording date and time and the tape position information on the tape during recording, and records the recording date, recording start time, recording end time, recording channel, and recording in the memory. The tape position information of the start, the tape position information of the recording end, and the tape remaining amount value at the recording start point are stored. When searching, first determine the tape search direction by comparing the current tape remaining amount value with the tape remaining amount value at the recording start point of the program to be searched stored in the memory, and then determine the current tape recorded on the tape. The tape is run until it matches while comparing the tape position information with the tape position information of the program to be searched stored in the memory. If the tape position information matches, the date and time at the time of the video recording last recorded on the tape and the video recording date and the video recording start time of the program to be searched stored in the memory are compared. With the above method, it is possible to accurately find the beginning of a program.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a VTR of the present invention. A control head 10 for recording / reproducing a control signal and writing / reading of a control signal to / from a magnetic tape 11 via the control head 10 are performed. A control signal recording / reproducing circuit 4, an electrically erasable programmable read only memory (hereinafter referred to as an EEPROM) 3 for storing index information of a recorded program and a recording start tape position, and E when necessary.
An on-screen display circuit (hereinafter referred to as an OSD circuit) 5 and a video signal processing circuit 6 for displaying the index information stored in the EPROM 3 on the monitor 7.
A key input device 8 for program selection and VTR operation at the time of program search, a tape drive circuit 9 for running a tape cassette, and a microcomputer (hereinafter, referred to as a microcomputer) 1 for controlling the above system. It is composed by.

The operation of the VTR constructed as above will be described in detail below. FIG. 2 shows that the EEPROM 3 attached to the cassette tape 12 is the VTR main body 13
FIG. 7 is a schematic view showing a state where the cassette tape 12 is loaded in the VTR main body 13 and the connector 2 and the contacts are attached to the VTR main body 13; The EEPROM 3 can perform a reading operation and a writing operation only when it has a contact with the connector 2.

FIG. 3 is a schematic view showing a state in which the EEPROM 3 is attached to the cassette tape 12. In this embodiment, as shown in FIG.
Attach the EPROM3 and connect the connector 2 to VT as shown in Fig.2.
Attached to the bottom of the R body 13, the cassette tape 12 is VT
When descending in the R body 13, the EEPROM 3 has a contact with the connector 2.

FIG. 4 shows the recording waveform of the control signal, the reproduction waveform, and the recording format of the data area. As shown in FIG. 4A when one cycle of the control signal is 100%. A signal having a high level (hereinafter, referred to as H level) period of about 60% is a “0” pulse, and a signal having an H level period of about 27.5% is a “1” pulse as shown in FIG. 4B. In accordance with the specifications shown in FIG. 4C, a so-called BC that expresses a decimal number in a binary number using the above-mentioned "0" pulse and "1" pulse in the data area
Record the recording date and time with the D code. Here, the recording date and the recording time are recorded alternately, but the first 3 bits are used to determine which of the recording date and the recording time is recorded.

Using this method, the recording date and recording time are written in the control track of the tape cassette during recording. The time code data in FIG. 4C indicates the tape position, and the tape position obtained by converting the time from the start end of the tape at the time of recording the video is a BCD code using the above-mentioned "0" pulse and "1" pulse. To record. This tape position in this embodiment is a factor when recording continuously. When recording is stopped once, when recording is restarted, the tape position is converted and the tape is rewound for about 1 second, the tape position is read, and the value is continuously counted from that value. In the case of discontinuous recording including an unrecorded portion, the tape position cannot be read even when rewound, so that portion is reset from the beginning by resetting the count value of the tape position.

FIG. 5 shows the EEPROM for storing the recording month / day, day of the week, start time, end time, recording channel, start tape position, end tape position, start point remaining amount value of each program.
3 is a map diagram of No. 3, and in this embodiment, an EEPROM having a storage capacity of 4 Kbits is used, and a horizontal axis represents a lower address (4 bits) and a vertical axis represents a higher address (5 bits) to represent a memory space. . The 16 bytes from address 1 to address 16 on the horizontal axis share 1 byte with 5 bits for the recording month and 3 bits for the recording day for each program, 1 byte on the recording day, and 1 byte per 1 byte at the start time. 2 bytes are used and the end time is 2 bytes as in the start time, 2 bytes are used for the recording channel, 3 bytes are used for the start tape position and the end tape position, and 2 bytes are used for the start point remaining amount value. As described above, the tape position in this embodiment is
It is the tape position counted from the beginning of the tape, but it is a factor when recorded continuously. When recording is stopped once, when recording is restarted, the tape position is converted and the tape is rewound for about 1 second, the tape position is read, and the value is continuously counted from that value. In the case of discontinuous recording including an unrecorded portion, the tape position cannot be read even when rewound, so that portion is reset from the beginning by resetting the count value of the tape position. Vertical axis addresses 1 to 3
Up to 2 corresponds to data of one program in units of 16 bytes on the horizontal axis, and the number of programs that can be registered is 32 programs. That is, in this embodiment, data of 32 programs per cassette is E
It can be stored in EPROM. Storage capacity is 4K
The number of registrable programs can be increased by using an EEPROM larger than a bit. The recorded programs are written in the EEPROM in the recording order on the tape at the end of recording. At this time, if the program is erased from the tape by overwriting, the data is also erased from the EEPROM. Therefore, at the end of recording, the start tape position and end tape position of a newly recorded program are compared with the start tape position and end tape position of each program stored in the EEPROM, and the program is erased and recorded at which position. The newly recorded program is written in the EEPROM while rearranging the data on the EEPROM by deciding whether or not it has been recorded.

A series of operations will be described along the flow of operations. First, when recording is performed, the recording date and time of the recorded program, the start / end time, the recording channel, the start / end tape position, and the tape remaining amount value at the start point are written to the EEPROM 3 attached to the cassette tape 12. As described above, the writing of data to the EEPROM 3 is performed by recording the start tape position and end tape position of the newly recorded program and the EE
The start tape position and the end tape position of each program stored in the PROM 3 are compared, the program is erased and the position at which the program is recorded is judged to rearrange the data on the EEPROM 3 and the newly recorded program is recorded. EEPROM3
Write in.

Next, when the recorded program is reproduced and viewed, the cassette tape 12 on which the desired program is recorded is inserted into the VTR main body 13 and when the cassette tape 12 descends, the connector 2 attached to the VTR main body 13 Has a contact point with the EEPROM 3 attached to the cassette tape 12, and reads the data stored in the EEPROM 3. The read data is displayed on the monitor 7 by the video signal processing circuit 6 via the OSD circuit 5 as shown in FIG. Seeing this display, the key input device 8
Move the cursor of to select the program you want to watch.

The processing at the time of program search will be described with reference to the flowchart of FIG. Once the program to search is selected,
First, the tape remaining amount value calculated based on the tape remaining amount value at the starting point of the program to be retrieved read from the EEPROM 3 in step 1 of FIG. 7 and the current ratio of the rotation cycle of the winding side reel and the supply side reel is calculated. Compare and check the positional relationship between the start point of the program to be searched and the current tape position. This determines the running direction of the tape. If the start point of the program to be searched is forward, the microcomputer 1 sends a rewind command to the tape drive circuit 9 to rewind the tape in step 2, and if the start point of the program to be searched is backward, the microcomputer 1 in step 3 A fast-forward command is sent to the tape drive circuit 9 to fast-forward the tape. The tape remaining amount value is calculated based on the ratio of the rotation cycle of the take-up reel (not shown) and the supply reel (not shown). Therefore, the tape remaining amount value can be obtained even in the unrecorded portion.

Next, at step 4, the tape position at the start point of the program to be retrieved which is read from the EEPROM 3 is compared with the current tape position recorded on the tape while the tape is running in the rewinding or fast-forwarding direction. The current tape position is recorded on the control track on the tape during recording. When the recording is discontinuous recording including an unrecorded portion, the count value at the tape position may be reset and counted from the beginning, so that the count value at the same tape position may exist in one cassette. Therefore, even if the tape position of the start point of the program to be searched matches the current tape position, the program may not be the program to be searched.
Therefore, in step 5, the recording start time of the program to be retrieved read from the EEPROM 3 is compared with the recording time recorded on the tape. The time of recording is
Similar to the current tape position, the time at the time of recording is compared.
The time at the time of recording is recorded on the index track on the tape at the time of recording, similarly to the current tape position. If the two data do not match in step 5, it means that the program currently searched is not the program to be searched. Therefore, the program returns to step 4 and the tape position of the starting point of the program to be searched again and the current tape position are determined. Compare. When the tape position of the starting point of the program to be searched in step 4 matches the current tape position and both data match in step 5, it indicates that the program currently searched is the program to be searched. The search operation ends.

With the above operation, it is possible to accurately find the beginning of a program. In this embodiment, the tape position during recording and the recording time are recorded on the control track on the tape. However, the current tape position and the recording time are recorded on the tape by superimposing on the video signal. It is also possible to do so. Although the present embodiment has been described by taking the VHS standard as an example, the same effect can be obtained by recording on a dedicated data recording track on the tape or recording on the tape by superimposing it on the video signal in other standards. It is possible to obtain.

[0020]

As described above, according to the present invention, the storage means for storing the index information of the recorded program and the recording start tape position information, the writing means for writing the information in the storage means, and the reading for reading the information from the storage means Means, a display means for displaying the information read from the storage means, a recording means for recording the tape position information and the recording time on the tape during recording, a reproducing means for reproducing, and a storing means for storing. A first comparing means for comparing the recording start tape position information with the tape position information obtained by the reproducing means, and a second comparing means for comparing the recording start time included in the index information with the recording time obtained by the reproducing means. Comparison means,
A control means for searching a program according to the results of the two comparison means is provided, and the recording date and time and the tape position are recorded on the tape at the time of recording, and the recording date, recording start time,
The recording end time, recording channel, recording start tape position, recording end tape position, and tape remaining amount value at the recording start point are stored. When searching, first determine the tape search direction by comparing the current tape remaining amount value and the tape remaining amount value of the recording start point of the program to be searched stored in memory, and then determine the tape search direction and the current tape position and memory. The tape is run until it matches while comparing the stored tape position of the program to be searched. If the tape positions match, the date and time of the last recording on the tape and the recording date and recording start time of the program to be searched recorded in the memory are compared. With the above method, it is possible to realize an excellent VTR capable of accurately cueing a program.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a video tape recorder of the present invention.

FIG. 2E of an embodiment of the video tape recorder of the present invention
Schematic showing a state with contacts of EPROM and connector

FIG. 3E of an embodiment of a video tape recorder of the present invention
Schematic showing how EPROM is attached to a cassette tape

FIG. 4 is a schematic diagram showing a recording waveform of a control signal, a reproducing waveform, and a recording format of a data area in an embodiment of a video tape recorder of the present invention.

FIG. 5E of an embodiment of the video tape recorder of the present invention
Map diagram of information stored in EPROM

FIG. 6 is a screen display example of a program list at the time of program search in one embodiment of the video tape recorder of the present invention.

FIG. 7 is a flowchart showing a process at the time of program search of an embodiment of the video tape recorder of the present invention.

[Explanation of symbols]

1 Microcomputer 2 Connector 3 Electrically Erasable Programmable Read Only Memory 4 Control Signal Recording / Reproducing Circuit 5 On-Screen Display Circuit 6 Video Signal Processing Circuit 7 Monitor 8 Key Input Device 9 Tape Drive Circuit 10 Control Head 11 Magnetic Tape 12 Cassette Tape 13 VTR body

Claims (1)

[Claims] 1. A storage means for storing index information of a recorded program and recording start tape position information, a writing means for writing information in the storage means, a reading means for reading information from the storage means, and the storage means. Display means for displaying information read from the tape, recording means for recording tape position information and time during recording on the tape during recording, reproducing means for reproducing, and the recording start tape stored by the storage means. A first comparing means for comparing the position information with the tape position information obtained by the reproducing means; and a first comparing means for comparing the recording start time included in the index information with the recording time obtained by the reproducing means. Two
And a control means for performing a program search according to the results of the two comparison means.