JP2599030B2 - Recording mode control circuit - Google Patents

Description

The present invention relates to a recording mode control circuit used for a recording / reproducing apparatus such as a video tape recorder.

(B) Conventional technology In recent years, a magnetic recording / reproducing apparatus with high resolution and high image quality with improved tape performance and magnetic head has been developed. Also for home video-tape recorders, those capable of recording in image quality mode with a sufficiently high carrier frequency have become widespread.

Since there is no compatibility between signals recorded in recording modes having different carrier frequencies, it is necessary to determine the recording mode during reproduction. This determination method is disclosed, for example, in Japanese Patent Application Laid-Open No. 62-216683. Thus, at the time of tape reproduction, switching to a reproduction system according to the recording mode is performed.

(C) Problems to be Solved by the Invention By the way, when information is recorded on one tape in a plurality of recording modes, it takes some time to determine the change of the recording mode at the transition of the recording mode. And during the time required for this determination, the reproduction is performed in the same mode as the previous mode. Therefore, during this time, the reproduction screen is disturbed.

On the other hand, when performing insert recording in which a new signal is recorded without rewriting the reproduction control signal, the recording mode is determined by operating the recording mode setting switch of the operation unit as in the case of recording. However, such a configuration may cause the following inconvenience. That is, when the recording mode of the part before the insert recording start point and the recording mode of the part after the insert recording end point are the same, if the recording mode of the insert recording part is different from the recording modes before and after that, At the time of reproduction after the end of recording, as described above, the inconvenience that the reproduction screen is disturbed at the transition of the recording mode occurs.

(D) Means for Solving the Problems Therefore, in the present invention, a mode holding circuit for holding the recording mode of the start point and the end point of the insert recording determined by the mode determining circuit is provided, and the mode holding circuit stores the mode. The two modes are compared by a comparison circuit, and when a match is detected, the recording mode during insert recording is set to the same mode as the mode in which the match was detected by the recording mode setting circuit.

(E) Operation According to the above configuration, the mode of the insert recording matches the mode before and after the insert recording.

(F) Example In the figure, it is assumed that the recording modes of the start point and the end point of the insert recording are both S-VHS mode.

First, the playback button of the operation unit 1 is operated, and the video circuit 4 is set to the playback state by the output of the control circuit 2. In this state, when the fast forward and rewind buttons of the operation unit 1 are operated, the tape drive circuit 3 is driven in response to the operation,
Thus, the end point of the insert record is searched.

When the end point of the insert recording is determined, the end point determination button of the operation unit 1 is operated. At this time, the switch SW is connected to the end point contact. When the end point determination button is operated, the recording mode at that time is determined by the mode determination circuit 6 and stored in the holding circuit 7b. At the same time, the linear time count value read by the control head 5 at the end point is stored in the tape drive circuit 3.

Next, in order to find the start point of the insert recording, the tape is run by operating the rewind button or the like of the operation unit 1. At this time, the switch SW is connected to the start point. When the start point of the insert recording is determined, the start point determination button of the operation unit 1 is operated. Then, the recording mode at that time is S-VH
Whether it is S or normal VHS is determined by the mode determination circuit 6 and stored in the holding circuit 7a. At the same time, the linear time count value read by the control head 5 at the start point is stored in the tape drive circuit 3. Further, a pause state is set, and the apparatus enters an insert recording standby state.

In this state, the modes stored in the holding circuits 7a and 7b are compared by the comparison circuit 8 and if a match is determined, the recording mode setting circuit 9 sets the recording mode during insert recording to the same as this mode. Mode, that is, the S-VHS mode. If a mismatch is detected, the recording mode is set to the mode as manually set by the operation unit 1.

After that, if the pause state is released, the tape drive circuit 3
Over the section of the linear time count value stored in
Insert recording will be performed.

(G) Effects of the Invention According to the present invention, the insert recording mode can be automatically made to match the recording mode before and after the insert recording mode.
Screen disturbance at the time of reproduction after insert recording can be prevented.

[Brief description of the drawings]

FIG. 2 is a diagram showing a recording mode control circuit according to the present invention. 6 is a mode discriminating circuit, 7a and 7b are mode holding circuits, 8 is a comparing circuit, 9 is a recording mode setting circuit.

Claims (1)

(57) [Claims] 1. A mode discrimination circuit for discriminating a recording mode of information recorded on a recording medium, a mode holding circuit for holding a recording mode of a start point and an end point of insert recording determined by the mode discrimination circuit. A comparison circuit that compares the recording modes at the start point and the end point of the insert recording stored in the mode holding circuit; and when the comparison circuit detects a match between the two modes, the recording mode of the insert recording is matched. A recording mode control circuit comprising a recording mode setting circuit for setting the same mode as the detected mode.