JPH0522741A - Recorder and reproducer - Google Patents

Abstract

PURPOSE:To reproduce the desired still picture of a MUSE signal. CONSTITUTION:The MUSE signal consists of four fields for one round. A field discriminating circuit 2 outputs the discriminating signal of the first-fourth field to an index signal inserting circuit 3 at the time of recording scene- photographing and outputs a recording control signal which becomes high-level among the first-fourth fields. The index signal inserting circuit 3 generates the pilot signal of a frequency outsides an FM signal band and executes addition at the point of recording start time in the first field of the signal for recording. When a recording signal control circuit 4 outputs the signal processed by the index signal inserting circuit 3 to a head 5 while the recording control signal is high-level, information of the first-fourth fields is recorded on the magnetic tape and also an index signal is recorded at the top of the first field.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for recording and reproducing a MUSE signal in which a high-definition signal is band-compressed.

[0002]

2. Description of the Related Art The MUSE signal is proposed by the Japan Broadcasting Corporation (NHK) for transmitting a high-definition signal through one channel of satellite broadcasting, and the luminance signal has a bandwidth of 20.
It is a transmission signal having a bandwidth compressed to 8 MHz by performing multiple sub-Nyquist sampling of a MHz high-definition signal.

FIG. 5 shows a sample pattern of the MUSE system. On the transmitting side, the sampling points are sequentially changed in the first to fourth fields, and one still image is transmitted by four fields. Further, on the image receiving side, one still image is reproduced by using images of sampling points for four fields using the frame memory. That is, in the case of a still image, it can be transmitted without deteriorating the image quality,
In the case of a moving image, when the image is reproduced by the signals of different fields, the resolution of the image deteriorates.

Therefore, on the image receiving side, it is discriminated whether it is a still picture area or a moving picture area based on the correlation between frames in units of sampling points, and the moving picture area is reproduced only by the current one field sampling points. Is configured. Therefore, in the region of the moving image, the resolution is deteriorated because the bandwidth is narrowed, but it is difficult to judge the deterioration due to human visual characteristics. In addition, on the transmitting side, the receiving side can accurately detect the movement of the image,
Information about the movement is superimposed as a control signal in the form of a digital signal as part of the video signal. That is, since the MUSE system can transmit a high-definition signal with a narrow bandwidth without visually degrading the resolution of a moving image, it can be used by a magnetic recording / reproducing apparatus such as a video tape recorder (VTR) used at home. The time can be recorded.

Next, as an example of this type of magnetic recording / reproducing apparatus, a home VTR for recording an NTSC video signal.
Will be described. 6 is a perspective view showing the vicinity of the rotary drum of a household VTR, FIG. 7 is a top view showing the rotary drum of FIG. 6, and FIG. 8 is an explanatory view showing data on a magnetic tape. The rotary drum 7 includes a head 5a as shown in FIG.
5b are attached 180 degrees apart, and the magnetic tape 6
Is guided by guide pins 8 and 9 so as to be obliquely wound around the rotary drum 7 as shown in FIG.
Here, the luminance signal of the video signal is subjected to recording processing such as FM modulation, and then, as shown in FIG.
Thus, the data is recorded on the magnetic tape 6 for each of the first and second fields. Further, at the time of reproduction, the magnetic information recorded on the magnetic tape 6 is reproduced by the heads 5a and 5b, and the processing reverse to that at the time of recording is performed and converted into a luminance signal.

[0006]

By the way, recent VT
In R, there is a mode for recording one screen at a time, which is called time-lapse shooting. During playback, the operator operates the jog dial to change the track for still playback, select the screen, and play back the desired still image. It is known what you can do.

However, since the MUSE signal forms one still image by using the sampling points for four fields as described above, all four fields must be recorded. On the other hand, in the NTSC system, since one round consists of two fields, N
The TSC VTR has a problem that only two fields are recorded. Further, in the case of recording all of the four fields, it is difficult to know exactly which four fields make a round when the frame-taking is performed a plurality of times, and therefore the normal still image is recorded. There is a problem that the image cannot be reproduced.

In view of the above conventional problems, the present invention provides a MUS
It is an object of the present invention to provide a recording / reproducing device capable of reproducing a desired still image of an E signal.

[0009]

In order to achieve the above object, the present invention shows a field discriminating circuit for discriminating a field of a MUSE signal and a reference position of the field of the MUSE signal based on the discriminating result of the field discriminating circuit. An insertion circuit for inserting the index signal into the MUSE signal,
It is characterized in that it has four fields of the MUSE signal and a control circuit for controlling the index signal of the insertion circuit to be recorded on a recording medium according to the discrimination result of the field discrimination circuit.

[0010]

According to the present invention, when the MUSE signal information stored in the recording medium is reproduced, the first to fourth fields of the MUSE signal are reproduced with the index signal as a reference, and therefore, the desired stillness of the MUSE signal is reproduced. The picture can be reproduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a block diagram showing an embodiment of a recording / reproducing apparatus according to the present invention, FIG. 2 is a timing chart showing main signals in the recording / reproducing apparatus of FIG. 1, and FIG. It is explanatory drawing which shows information.

In FIG. 1, a recording signal processing circuit 1 converts a recording MUSE signal into a recording signal by FM modulation or the like, and a field discriminating circuit 2 also records a recording MUSE signal of 4 fields in one cycle at the time of time-lapse recording. Discriminating the order of the fields, and outputting the discrimination signal and the recording control signal for the period between four fields. The index signal insertion circuit 3 determines, according to the discrimination result of the field discrimination circuit 2,
At the recording start point of the recording signal processed by the recording signal processing circuit 1, for example, a pilot signal serving as an index is generated and added at a frequency outside the FM signal band. The recording signal control circuit 4 at the next stage outputs the signal processed by the index signal insertion circuit 3 to the head 5 during the recording control signal of the field discrimination circuit 2.

Next, the operation of the above embodiment will be described with reference to FIGS. The field discrimination circuit 2 outputs discrimination signals of the first to fourth fields as shown in FIG. 2A to the index signal insertion circuit 3 at the time of time-lapse recording, and as shown in FIG. A recording control signal that goes high during the first to fourth fields is output. The index signal insertion circuit 3 generates a pilot signal having a frequency outside the FM signal band as shown in FIG. 2B, and adds the pilot signal at the recording start time of the first field of the recording signal. Therefore, when the recording signal control circuit 4 outputs the signal processed by the index signal insertion circuit 3 to the head 5 while the recording control signal is at the high level, the first magnetic tape T is recorded on the magnetic tape T as shown in FIG. ~ The video information of the fourth field is sequentially recorded, and the index signal is recorded at the beginning of the first field.

When reproducing the magnetic information recorded on the magnetic tape T, the information of the first to fourth fields is written in the memory on the basis of the index signal at the head of the first field, and the first to fourth fields are written. By repeatedly reading the information of 4 fields from the memory, the MUSE signal of 4 fields for one cycle is repeatedly reproduced. Therefore, when this MUSE signal is decoded by the MUSE decoder, a normal still image is obtained.

In the above embodiment, the index signal is added to the beginning of the first field, but instead, as shown in FIG. 4, the index signal is recorded on the control track of the magnetic tape T, The first to fourth fields may be reproduced based on the index signal.

In the above embodiment, an example in which the MUSE signal is decoded by the MUSE decoder when reproducing the information of the first to fourth fields has been described. However, since the reproduced image is a still image, the reproduced MUSE signal is If the motion information of the control signal is forcedly set to a complete still image, a more stable still image can be reproduced. Further, in the above embodiment, an example in which the information of the first to fourth fields is written in the memory has been described, but the frame memory of the MUSE decoder may be directly controlled by the index signal. Further, in the above embodiment, the case where the analog signal is recorded on the magnetic tape T has been described, but it may be configured to be digitized and recorded on the magnetic disk or the like.

[0017]

As described above, the present invention is based on the MUS
A field discriminating circuit for discriminating the field of the E signal,
The index signal indicating the reference position of the field of the MUSE signal is M based on the discrimination result of the field discrimination circuit.
The recording medium has an insertion circuit to be inserted into the USE signal, and a control circuit for controlling the four fields of the MUSE signal and the index signal of the insertion circuit to be recorded on the recording medium according to the discrimination result of the field discrimination circuit. When the stored MUSE signal information is reproduced, the first to fourth fields of the MUSE signal are reproduced with the index signal as a reference, so that a desired still image of the MUSE signal can be reproduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a recording / reproducing apparatus according to the present invention.

2 is a timing chart showing main signals in the recording / reproducing apparatus of FIG.

FIG. 3 is an explanatory diagram showing magnetic information in the recording / reproducing apparatus of FIG.

FIG. 4 is an explanatory diagram showing magnetic information in a modified example of the embodiments of FIGS.

FIG. 5 is an explanatory diagram showing a sample pattern of the MUSE method.

FIG. 6 is a perspective view showing the vicinity of a rotary drum of a home VTR.

FIG. 7 is a top view showing the rotary drum of FIG.

FIG. 8 is an explanatory diagram showing data on a magnetic tape.

[Explanation of symbols]

 2 field discrimination circuit 3 index signal insertion circuit 4 recording signal control circuit 5 head T magnetic tape

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location // H04N 7/00 A 9070-5C (72) Inventor Shin Shimogoriyama 3-30-2 Shimomaruko, Ota-ku, Tokyo No. Canon Inc.

Claims (1)

Claim: What is claimed is: 1. A field discrimination circuit for discriminating a field of a MUSE signal, and an insertion for inserting an index signal indicating a reference position of a field of the MUSE signal into the MUSE signal according to the discrimination result of the field discrimination circuit. A recording / reproducing apparatus comprising: a circuit; and a control circuit for controlling to record the four fields of the MUSE signal and the index signal of the inserting circuit on a recording medium according to the discrimination result of the field discriminating circuit.