JPH03178283A - Digital recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a digital recording and reproducing apparatus for recording and reproducing band-compressed video signals such as high-definition M[JSE signals.

2. Description of the Related Art In recent years, analog magnetic recording and reproducing devices or digital magnetic recording and reproducing devices have been announced as devices for recording and redistributing MUSE signals. By the way, the MUSE signal is a signal in which the control signal is time-axis multiplexed with the video signals Y, C and the audio signal as shown in Figure 3, and this control signal encodes the control signal data 32 focus as shown in Table 2. It's a signal.

(Left below) Table 2 In a conventional analog magnetic recording/reproducing device or digital magnetic recording/reproducing device, control signals are recorded and reproduced in the form of the MUSE signal shown in FIG. 3.

Problems to be Solved by the Invention However, in the conventional MUSE signal recording and reproducing apparatus, when trying to reproduce a still image, one field of the MUSE signal is outputted as a still reproduction output signal. Alternatively, it is possible to output a 4-field MUSE signal, but when outputting an l-field MtJSE signal, the MUSE signal decoder that inputs this signal will generate one image using the l-field information. , when the original image is a still image consisting of 4 fields of information,
This still image will be blurred. In addition, when outputting a 4-field MUSE signal, the MUSE signal decoder that inputs this signal inputs the information of these 4 fields into 1
It is determined that the information constitutes a still image. That is, if the original image includes a moving area, the image will be one in which that area overlaps across four fields.

In view of these points, it is an object of the present invention to provide a MUSE signal recording and reproducing apparatus that suppresses image quality deterioration during special reproduction as much as possible, and also to provide a digital recording and reproducing apparatus that reduces the recording bit rate.

Means for Solving the Problems The digital recording/reproducing apparatus of the present invention has a recording signal processing section with M
A circuit for decoding the control signal of the USE signal to generate control signal data, a circuit for processing the control signal data as a recording signal, and a circuit for reproducing the control signal data in a reproduction signal processing section;
A circuit that changes a certain bit in the control signal data Φ to a value corresponding to the type of special playback such as still playback or high-speed playback, and a circuit that encodes the control signal data and generates a control signal for the MUSE signal are provided. . It also determines the focus of the control signal data that informs the MUSE decoder of the type of special playback,
A circuit is provided to generate an image corresponding to the special reproduction. In other words, MUSE the 4 field information up to the field information where the focus for special playback has shifted to the bit representing still playback.
The decoder stores a circuit that outputs one frame image at that time, and a circuit that processes the input MUSE signal as the entire image motion area when the special playback bit is a bit that indicates high-speed playback. will be established.

Function: If the above-mentioned control signal decoding circuit, recording signal processing circuit, reproduction signal processing circuit, control signal data changing circuit, and control signal encoding circuit are provided, the control signal of the MUSE signal can be recorded as 32 bits of control signal data. The signal becomes a processed signal. Of this 32 bits of control signal data, n pintotes (n is an integer of 1 or more) are assigned as bits for special playback, and when special playback such as still playback or high-speed playback is performed, a special value corresponding to the type of special playback is assigned. Rewrite the bits for playback, encode it into a control signal, and
Output as a USE signal.

When this MUSE signal is input manually to the MUSE decoder,
The MUSE decoder determines the special playback bit of the control signal data, and if the bit indicates normal playback, performs conventional decoder processing, and if the bit indicates still playback, performs still playback processing. In other words, the MUSE decoder stores 4 field information up to the field information where the special playback bit has been moved to the bit representing still playback, and MUSE decoder stores one frame image at that time.
The E decoder outputs. As a result, the still area of the output image is made up of 4 field information of the MUSE signal, and the motion area is made up of 1 field information, so that no deterioration occurs in the still image. Furthermore, when the focus for special reproduction reaches a bit indicating high-speed reproduction, high-speed reproduction processing is performed.

That is, the input MUSE signal is processed as the entire image motion area.

Embodiment Regarding a digital recording/reproducing apparatus according to an embodiment of the present invention,
This will be explained with reference to the drawings.

FIG. 1 is a block diagram showing a digital recording/reproducing apparatus in this embodiment, and FIG. 2 is a block diagram of a MUSE decoder in this embodiment.

During recording, a MUSE signal is input manually from the input terminal l. This MUSE signal is converted into a digital signal by the A/D converter 2, and the YC1 audio signal of this digital signal is converted into a YC1 audio signal.
- The format is applied to the audio input circuit 3 to match the format of the digital signal to be recorded. Further, the control signal is applied to the control signal decoding circuit 4 and converted into control signal data. The formatted y, c, audio signals and control signal data are applied to a recording signal processing circuit 5, subjected to recording signal processing such as error correction encoding, and recorded on a recording medium by a recording/reproducing section 6.

During playback, the playback signal from the recording/playback unit 6 is subjected to playback signal processing such as decoding an error correction code in the playback signal processing circuit 7, and the Y-C/audio signal is sent to the MU in the Y-C/audio output circuit 10.
After being converted into the SE signal format, the control signal data is changed in the control signal data conversion circuit 8 and then converted to MUSE in the control signal encoding circuit 9.
encoded into a format control signal.

The Y, C, audio, and control signals of this MUSE formant are added with a synchronization signal, etc., and are outputted from an output terminal 12 as a MUSE signal via a D/A converter 11.

Next, the operation of the control signal data changing circuit 8 will be explained. Specific 1 in the control signal data in Table 2
or more bits are allocated for data modification,
In this embodiment, two bits, Nα21 and Nα22, are allocated for special reproduction. Table 1 shows bit assignments for control signal data.

Table 1 Control signal data No. 21 and N (The value of L22 represents the reproduction state as shown in Table 1 and is normal.

Still, representing high-speed playback. The control signal data change circuit 8 outputs data No. 21 and Nα2 during normal playback.
2 is set to 0.0, 10 during still playback, and 1.1 during high speed playback.

When such a MUSE signal is output from the digital recording/reproducing device and inputted to the input terminal 21 of the MUSE decoder shown in FIG. A small signal detection circuit generates control signal data. The special reproduction bit discrimination circuit 25 discriminates the control signal data Nα 21 and No. 22, and if the bit discrimination circuit 25 determines the control signal data Nα 21 and No.
3 performs conventional decoder processing, and if data control 21 and block 22 are 1, 0, special reproduction control circuit 26 performs still reproduction processing. That is, the output of the MUSE decoder circuit 23 is the MUSE immediately before the data Nα21 and Nα22 become 1.0.
The output image is fixed to the EI frame output image, and this output image is output from the output terminal 27. As a result, the still area of the output image is made up of 4-field information of the MUSE signal, and the moving area is made up of 1-field information, so that no deterioration occurs in the still image. Also, data Nα21 and N
If l122 is 1,1, the special reproduction control circuit 26 performs high-speed reproduction processing, that is, the MUSE decoder circuit 23 processes the input MUSE signal as the entire image motion area.

As described above, in the embodiment of the present invention, the number of bits to change the control signal data is 2 bits, but the number of bits for special reproduction is not limited. Furthermore, changing the controller signal D1 is not limited to special playback. That is, control signal data 3
Either of the two focuses may be changed.

In addition, in the embodiment of the present invention, 2 focus points are assigned from 32 bits of control signal data for special playback.
Signal data for special playback is MU other than control signals.
It may also be inserted into the SE signal.

Effects of the Invention The present invention has the following effects. Since the G control signal is decoded and recorded during recording, there is no need for an encoding circuit in the playback section, and furthermore, processing time for decoding during playback is eliminated. Furthermore, the recording bit rate of the control signal data is lower than that of the control signal, which effectively leads to an improvement in recording density. Furthermore, by setting several bits of the control signal data for special reproduction, special reproduction of the MUSE signal can be performed with as little deterioration of image quality as possible.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a digital recording/reproducing device according to an embodiment of the present invention, FIG. 2 is a block diagram showing a MUSE decoder according to an embodiment of the present invention, and FIG. 3 is a diagram showing a conventional MUSE signal format. . 1.21... Input terminal, 2.22...
A/D converter, 3... Y-C/audio input circuit,
4... Control signal decoding circuit, 5...
... Recording signal processing circuit, 6... Recording/reproducing section, 7... Playback signal processing circuit, 8... Control signal data changing circuit, 9... ... Control signal encode circuit, 10 ... Y-C audio output circuit, 11 ... D/A converter, 12.2
7... Output terminal, 23... MUSE decoder circuit, 24... Control signal detection circuit, 25... Special playback focus determination circuit, 26
...Special regeneration control circuit.

Claims (2)

[Claims] (1) A device for digitally recording and reproducing high-definition MUSE signals, wherein the recording signal processing section includes a circuit that decodes the control signal of the MUSE signal and generates control signal data, and a circuit that records and processes the control signal data; A digital recording and reproducing device characterized in that the reproduction signal processing section has a circuit for reproducing control signal data, a circuit for changing the data value of the control signal data, and a circuit for encoding the control signal data and generating a control signal of the MUSE signal. Device. (2) A digital recording and reproducing device for digitally recording and reproducing high-definition MUSE signals, wherein the recording and reproducing signal processing section has a circuit that rewrites control signal data into data for special reproduction during special reproduction.