JPH01211294A - Video signal recorder - Google Patents

Abstract

PURPOSE:To record even other information by providing a means to insert a frame code to indicate a frame number into the prescribed horizontal period of a video signal and another means to replace the frame number of the frame code with number data except the frame number. CONSTITUTION:A video signal V to be recorded is supplied to an input terminal 1, and the video signal V is sent to a synchronization separating circuit 2 and a mixing circuit 3. While a timing control circuit 4 generates a synchronization pulse Ps to synchronize with, for example, a 17th H and an 18th H of the video signal V based on a separated synchronizing signal SY and a reference clock signal CK and sends the pulse Ps to the circuit 3 and a frame counter circuit 5, the timing control circuit 4 generates an odd and even discriminating pulse PO/E, sends the pulse PO/E to the circuit 5, and further sends a vertical synchronizing signal VD to the circuit 5 and a data controller 6. The circuit 5 prepares frame data DF, and a controller 5 prepares parallel data DP, which has a mode to replace the data DF with the numerical data. Thus, even other information can be recorded on a magnetic tape 11.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a video signal recording device, such as a video tape recorder, which is configured to record a so-called frame code together with a video signal.

80 Summary of the Invention The present invention relates to a video signal recording device such as a video tape recorder configured to record a frame code together with a video signal, by replacing the frame number with arbitrary numerical data. The present invention provides a video signal recording device which has a simple device configuration and is capable of recording desired numerical data.

C0 Prior Art Conventionally, in a video signal recording (and/or reproducing) device such as a so-called video tape recorder (VTR) that records (and/or reproduces) video and image signals, a frame number is recorded along with the video signal. A frame code configured to record a so-called frame code for displaying a frame code has been proposed.

Some frame codes are inserted into a predetermined horizontal period of a video signal and recorded on a recording track for the video signal.

For example, a method has been proposed in which 24-bit digital data indicating a frame number is inserted and recorded in the video portions of the 17th and 18th horizontal periods.

Such a frame code is used only to indicate a frame number as an absolute address on a recording medium. That is, when reproducing a recording medium on which this frame code is recorded, by reproducing this frame code, the position of the video signal to be reproduced on the recording medium can be displayed, or the position of the recorded video signal can be displayed. It is now possible to search for a desired location in the video signal.

On the other hand, for example, a device configured to record a so-called time code (VITC signal), such as the device described in Japanese Patent Application Laid-open No. 130116/1987, which was previously proposed by the applicant, There is something. This VITC signal inserts time code data consisting of 90-bit digital data for each field within a video period excluding the horizontal blanking period from one horizontal period.
This time code data includes second data, minute data, hour data, frame data, user's focus, and a CRC code for checking data errors.

D1 Problems to be Solved by the Invention Comparing the above-mentioned frame code and time code, in the case of time code, the configuration for recording and reproducing the VITC signal is complicated, making it difficult to manufacture the device. In addition, there is a problem that the device is expensive. In addition, in the case of the frame code described above, although the device configuration can be greatly simplified, it is also possible to display desired information other than the display of the absolute address, such as the serial number (so-called reel number) and recording date of the recording medium. There is a problem that information cannot be recorded.

Therefore, the present invention is proposed in view of the above-mentioned circumstances, and is capable of recording other information without complicating the configuration in a video signal recording device that has at least a frame code recording function. The purpose is to

88 Means for Solving the Problems In order to solve the above problems and achieve the above objects, a video signal recording device according to the present invention records a video signal on at least a recording medium, and records a predetermined amount of the video signal. The present invention is characterized by comprising means for inserting a frame code representing a frame number into a horizontal period, and replacement means for replacing the frame number of the frame code with numerical data other than the frame number.

F9 Effect In the video signal recording device according to the present invention, arbitrary numerical data other than the frame number, such as a reel number, can be recorded instead of the frame number of the frame code.

G. Examples Specific examples of the present invention will be described below with reference to the drawings.

The video signal recording device according to the present invention has the following features for a recording medium:
It is a device that records at least a video signal. and,
It has a frame code recording circuit which is a means for generating a frame code and inserting this frame code into the video signal.

In the frame code recording circuit, as shown in FIG. 1, a video signal V to be recorded is supplied to an input terminal l from a predetermined video signal output means.

This video signal V is a video signal based on the so-called NTSC system or PAL system, and as shown in FIG.
This is a signal whose horizontal period) is a predetermined time (for example, 63.5 μs). This video signal V is sent to a synchronization separation circuit 2 and a mixing circuit 3.

The synchronization separation circuit 2 extracts a synchronization signal indicated by SY in FIG. 2 contained in the video signal V and sends it to the timing control circuit 4.

The timing control circuit 4 controls the video signal V based on the supplied synchronization signal SY and reference clock signal CK.
For example, the 17th and 18th H (first in one field)
A synchronizing pulse P8 synchronized with the 7th and 18th horizontal periods) is generated and sent to the mixing circuit 3 and the frame counter circuit 5, and an even/odd discrimination pulse po/l is generated and sent to the frame counter circuit 5. , further generates a vertical synchronization signal VD to transmit the frame counter circuit 5 to the frame counter circuit 5.
and sends it to the data controller 6. The above even-odd discrimination pulse P
oty is a pulse for identifying even and odd fields.

Further, the timing control circuit 4 is provided with a changeover switch 4a for corresponding to each of the video signal formats input to the circuit, such as the NTSC format and the PAL format.

The frame counter circuit 5 includes the synchronization pulse Pg,
The above-mentioned even-odd discrimination pulse PO/E and the above-mentioned vertical synchronization signal VD
Based on this, parallel frame data DP corresponding to the frame number is generated. This frame data D
" is the number of bits equal to the above frame code (e.g. 2
4 bits).

The data controller 6 is a data replacement means, and the frame data Dp and the vertical synchronization signal VD are sent to the data controller 6.
Numerical data Dn corresponding to an arbitrary numerical value is input from the outside via a predetermined input means. The above arbitrary numbers are
For example, it may be a serial number (so-called reel number) attached to a recording medium, a numerical value corresponding to the recording date or content of a video signal recorded on the recording medium, or the like. Then, this data controller 6 controls the data at a predetermined period (for example, 30 frames).
Each time, two consecutive frames are converted into the above frame data DF.
Parallel data Dp is generated by replacing the above numerical data Dn with the above numerical data Dn. The parallel data Dp generated in this manner is sent to a parallel/serial (P/S) conversion circuit 7.

Note that the data controller 6 is configured to be able to input an arbitrary frame number d, which is used when modifying the frame data Dv.

The P/S conversion circuit 7 converts the sent parallel data Dp into serial data Dg based on the clock signal CK supplied from the clock generator 8 and sends it to the modulation circuit (or code conversion circuit) 9.

The modulation circuit 9 converts the sent serial data DI+ into
Based on the clock signal CK supplied from the clock generator 8, it is converted into a 24-bit frame code Cp of bi-phase code modulation, for example. This pi-phase code modulation method means that when the bit value is “1”, it rises at the center of the bit period, and when the bit value is “0”
When , the modulation method is such that the signal falls at the center of the bit period.

The frame code CF is sent to the mixing circuit 3.

The mixing circuit 3 controls the supplied video signal V for a predetermined horizontal period (for example, 17H) based on the synchronization pulse Ps sent from the timing control circuit 4.
2 and 18H), as shown in FIG. Make it so that

Then, the frame code CP supplied from the modulation circuit 9 is superimposed on the portion set at this pedestal potential Ep to generate a video signal Vo.

``The video signal Vo generated in this manner is written and recorded on the tape 11, which is a recording medium, via the recording head IO.

In the video signal VO recorded on the tape 11, the frame code CF inserted in a predetermined horizontal period of each field corresponds to the frame data Dp of the frame formed by that field. The frame code CF is changed to one corresponding to arbitrary numerical data Dy+, such as a reel number, at predetermined intervals. That is, for example, with a period of 30 frames, as shown in FIG.
n.

Then, the video signal VO recorded on the tape 11
To play back the playback head 12, as shown in FIG.
Accordingly, the video signal VO is read from the tape 11, and the frame code CF is reproduced using the frame code reproduction circuit.

In the frame code reproducing circuit shown in FIG. 4,
The video signal Vo is demodulated, for example, by an FM demodulator 13, amplified by a head amplifier 14, and sent to a data separation circuit 15 and a synchronization separation circuit 16.

The data separation circuit 15 separates the frame code CF from the transmitted video signal and sends it to the frame code reader 17.

The synchronization separation circuit 16 separates vertical and horizontal synchronization signals VD and HD from the transmitted video signal and sends them to the frame code reader 17.

The frame code reader 17 converts the sent frame code CF into data, which is the frame data Dp or the numerical data Dn, based on the respective synchronization signals VD and HD, and sends it to the CPU 18.

In the above cpuis, the data to be sent is frame data D.
Determine whether it is F or numerical data D. That is, the above CP
As shown in FIG. 3, what is sent to U18 is either frame data DF whose numerical value increases each time the frame changes, or numerical data Dn which is unrelated to changes in frame data Dp. The numerical data Dn appears for two consecutive frames at a predetermined period (for example, 30 frames), and these data indicate the same numerical value. Therefore, the data for two consecutive frames are compared, and the frame data D2 and the numerical data Dn are determined based on the fact that the changes in the numerical values are discontinuous and the same data is repeated twice. be able to.

In this way, the data identified as the frame data Dp and the numerical data Dn are sent to the display means 19 as a display signal.

Based on the sent display signal, the display means 19
A frame number corresponding to the frame data Dv and a numerical value corresponding to the numerical data Dg are displayed.

In the video signal recording device according to the present invention configured as described above, when recording a video signal, the frame number of each frame is recorded together with the video signal, and also, for example, an arbitrary number such as a so-called reel number is recorded. Numerical data can be recorded. When reproducing the video signal, the frame number can be reproduced and displayed in correspondence with each frame, and the numerical data can also be reproduced and displayed.

The above numerical data is played back at a predetermined period, for example once per second, so no matter what position on the tape it is played back, it will be played over a predetermined period of time, e.g. one second or more. You can get it if you do it.

Furthermore, when the above frame code is played back, the playback of the above frame data is interrupted when the above numerical data is played back, but the frame data at this time can be easily supplemented from the previous and subsequent frame data. .

Note that the present invention is not limited to the above-mentioned embodiments, and for example,
To distinguish between the frame data Dp obtained by reproducing the frame code CF and the numerical data D9, these data may be directly displayed on a display means, and the operator may make the judgment from this display.

Effects of the H0 Invention As described above, in the video signal recording device according to the present invention, a frame code corresponding to a frame number can be recorded, and arbitrary numerical data can be recorded as a frame code in place of the frame number. . Therefore, the functions of so-called user's bits are realized without complicating the configuration.

That is, the present invention has a simple configuration and is easy to manufacture.
In addition, thanks to the inexpensive device configuration, frame numbers and arbitrary numerical data other than frame numbers can be recorded along with video signals.
The present invention provides a video signal recording device having the following functions.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram showing the configuration of a frame code recording circuit constituting a video signal recording device according to the present invention, and FIG. 2 is a schematic diagram illustrating the state of a video signal recorded by the video signal recording device. FIG. 3 is a diagram illustrating the state of the frame code recorded by the video signal recording device. FIG. 4 is a frame code reproduction method used when reproducing the video signal recorded by the video signal recording device. FIG. 2 is a block circuit diagram showing the configuration of a circuit. 4... Timing control circuit 5...
...Frame counter circuit 6...Data controller as replacement means

Claims (1)

[Scope of Claims] A video signal recording device for recording at least a video signal onto a recording medium, comprising: means for inserting a frame code representing a frame number into a predetermined horizontal period of the video signal; A video signal recording device comprising: replacing means for replacing the frame number of the code with numerical data other than the frame number.