JPS6050756A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To record an information signal to the recording area of another information signal and therefore to ensure the record and reproduction with high efficiency by recording the information signal having no change in a short time and no need for usual record by putting among the information signal changing momentarily. CONSTITUTION:In a record mode the time information is usually delivered from a time information setting circuit 15 in accordance with a signal format shown in a figure (a) and then recorded to a VTR. The field number of the time information is updated for each field of a video signal. The second is updated every 60 fields. While the date information is recorded just for several field periods after the recording is started. Then only the time information is recorded. In this case, the date information is recorded when the field of the time information is set at 0 in order to avoid the reproduction of date information when the reproduction starts at the middle of a tape. When a larger interval is desired, the date information is recorded when the second is set at 0.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for recording and reproducing video signals and digital signals.

2. Description of the Related Art Conventional Structures and Problems The method of converting an analog audio signal into a digital signal and recording and reproducing it has recently been widely used because it allows high-quality audio signals to be recorded and reproduced. In converting analog audio signals into digital signals, one thing is that it is easy to divide and merge signals, so a video tape recorder (hereinafter abbreviated as VTR), a device that can record and play back video signals, is used to record and reproduce video signals. It becomes possible to record and reproduce the digital signal using a video head together with the signal.

VTRs that are currently widely used use two heads to alternately record and reproduce video signals one field at a time. When one of the two heads is recording or reproducing a video signal, the other head is not recording or reproducing a video signal. By recording or reproducing the digital signal using this head that is not performing recording or reproducing, efficient signal recording and reproducing can be achieved.

To achieve this, as shown in Figure 1, the first
The second head 3 and the second head 4 may both be in contact with the tape 1. The signal train of each head for FIG. 1 (At is shown in FIG. 2 (A), and the recording state on the tape for it is shown in FIG. 3 (A). The signals for FIG. 1 (B) are shown in FIG. 2 ( B), Figure 3 03). Here ■1
．． V2 is a one-field video signal from the heads 3 and 4, respectively, and Dl and D2 are digital signals as well. That is, in FIG. 1(A) to FIG. 3(A), an audio signal corresponding to a period of one field of the video signal is recorded as a digital signal after one field of the video signal.
In FIG. 3(B), an audio digital signal is recorded before the video signal of one field.

To enable error correction, a digital signal is generally divided into blocks each consisting of a plurality of sample data as shown in FIG. 4, and a synchronization signal and an error detection signal are added to each block to form one frame.

A plurality of frames are concatenated to form a digital signal of one field of audio. Furthermore, this digital communication
It is possible to add digital data such as 111 information and control signals for realizing signal processing to the bow as information signals.

For example, time information is considered to be often used as an information signal. It has a wide range of uses, such as knowing the recording time of a tape, finding the beginning of a tape, searching for edit points when editing, and using it as edit point information.

In addition to time information, date information such as year, month, and day, text information such as a title, etc. can also be considered.

OBJECTS OF THE INVENTION An object of the present invention is to efficiently record and reproduce the information signal of the digital signal.

Composition of the Invention The recording and reproducing apparatus of the present invention comprises a digital signal to be recorded and reproduced together with a video signal, consisting of a signal obtained by digitizing an audio signal and an information signal representing various conditions. By recording another information signal whose information does not change in a short time, other than the information signal that is used, only during the first recording or at a fixed period, and at the time of reproduction, storing the reproduced other information signal and repeatedly reading it. FIG. 5 shows the configuration of an embodiment of the present invention in which the number of recordings of information that does not change over time is reduced and limited. Reference numeral 11 denotes a video signal input terminal to which a video signal is input from the outside. Reference numeral 12 denotes an audio signal input terminal to which an audio signal is input from the outside. 13 is a video signal modulation circuit which configures the video signal into a form suitable for the recording device. 14 is an audio signal digitization circuit that converts the audio signal into a digital signal. 15 is a time information setting circuit;
Time.

Outputs time information consisting of minutes, 9 seconds, and fields.

16 is a date information setting circuit which outputs date information consisting of year, month, day, and day of the week. A digital signal configuration modulation circuit 17 adds a synchronization signal, an error detection signal, etc. to the digitized audio signal and time information or date information to form an array, and modulates it suitable for the recording device.

18 is a time division multiplexing circuit which time division multiplexes the video signal and the digital signal as shown in FIGS. 2 and 3. Reference numeral 19 denotes a recording amplifier, which supplies a recording current to the heads A and B. Reference numeral 20 denotes a reproduction amplifier, which amplifies reproduction signals from the heads A and B. 21
The video/digital separation circuit separates and outputs the time-division multiplexed video signal and digital signal. 22 is a video signal demodulation circuit which restores the video signal modulated by the video 6 page signal modulation circuit 13 to the original video signal. A video signal output terminal 23 outputs the video signal restored by the video signal demodulation circuit 22. A digital signal demodulation circuit 24 demodulates the modulated digital signal, performs error detection and error correction, and separates it into a voice digital signal and time information or date information. Reference numeral 25 denotes an audio digital signal analog conversion circuit which restores the digitized audio signal to the original analog signal. 26 is an output terminal for the restored audio signal. 27 is a time information detection circuit which detects the time information of the field 2 minutes 9 seconds.

28 is a time information output terminal. 29 is a date information detection circuit that detects date information of year, month, day, and day of the week. This date information detection circuit 29 stores date information in a built-in storage section, and by reading it repeatedly, it is possible to constantly output date information. Also, this date information is updated every time new date information is sent. be done. 30 is a date information output terminal.

Figure 6 shows a 7-beam system that records time information as a digital signal. An example of Dame's newsletter format is shown below. Hour 2 minutes.

seconds, field time information is 8 pins each) (BO~B7
) are represented by digital signals Wo, Wl, W2, W3, and the lower four pins of these 8-bit digital signals)
(BO-B3) represents the - digit, the top 4 points) (B4
~B7) represents the tens digit.

In the case of digital signals, numerical values must be expressed in binary numbers, O~
It takes 4 bits to represent a 9-way numerical value.

Next, FIG. 7 shows a case in which daily information is expressed using the same signal format. WOK Only the last two digits of the Western calendar, the month in Wl,
Set the date to W2, and set B as well as the time information.

~B3 is represented in the - digit, and B4~BT is represented in the tens digit. Then, W3 is the day of the jump, ○ is Sunday, 1 is Monday, 2 is Tuesday, 3 is Wednesday, 4 is Thursday, 5 is Friday, 6 is Saturday [1] and so on.

During recording, the time information setting circuit 15 normally outputs time information according to the signal format shown in FIG.
recorded in In the time information, the field number is updated every field of the video signal, and the seconds are updated every 60 fields.

On the other hand, unlike time information, date information does not change constantly over a short period of time, so it does not need to be recorded constantly. So-
Here, date information is recorded only for the first few field periods when recording is started, and thereafter time information is recorded.

In this case, the date information is not reproduced when the tape is reproduced from the middle. As a method to prevent this, date information is recorded when the time information field is O. In this case, date information will be recorded once per second. If you want to leave more space, record when the seconds are 0, and the date information will be recorded once every minute.

As shown in Figure 2 below, date information that does not change in a short period of time is recorded in the form of a hole inserted between time information that changes from moment to moment.

During playback, the digital signal demodulation circuit 24 identifies time information and date information. As an identification method, an identification signal may be recorded separately, and if daily information is recorded when the time information field is O, the next information is detected by detecting field 69. You can see that the field contains date information.

In the above, date information was recorded as information that does not change in a short period of time, but information such as character information representing a title that does not change in a short period of time and does not need to be recorded constantly can be used. is obvious.

Effects of the Invention In the present invention, information signals such as date information that do not change over a short period of time and do not need to be recorded constantly can be recorded by inserting an interrupt between information signals that change from moment to moment, such as time information.
Another information signal can also be recorded at the recording location of one information signal, allowing efficient recording and reproduction.

[Brief explanation of drawings]

Figure 1 (5) and (B) are diagrams showing the relationship between the video tape recorder head and the tape, and Figure 2 (A) and ■) are diagrams showing the relationship between the head of the video tape recorder and the tape.
Signal format diagram corresponding to Figure 3 (~, (B)
FIG. 4 is a recording state diagram showing the signal state recorded on a 10-sided tape. FIG. 4 is a format diagram of a digital signal portion. FIG.
7 is a format diagram of a digital signal representing time information, and FIG. 7 is a format diagram of a digital signal representing date information. 15...Time information setting circuit, 16...Date information setting circuit, 17...D, digital signal configuration modulation circuit, 18...Time division multiplexing circuit, 24・
...Digital signal demodulation circuit, 27...
Time information detection circuit, 29..., date information detection circuit.

Claims (1)

[Claims] The digital signal to be recorded and played back together with the video signal is composed of a signal obtained by digitizing the audio signal and an information signal representing various information. A recording/reproducing apparatus characterized in that another information signal that does not change is recorded only during the first recording or at a constant cycle, and at the time of reproduction, the reproduced another information signal is stored and repeatedly read out.