JPH0317881A - Digital signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To dispense with the re-setting of time difference information even when a recording medium to be reproduced is exchanged by recording the time difference information set with a time difference information setter after converting to subcode data in the recording medium in a device provided with a phase modifying function. CONSTITUTION:When the output of the time difference information setter 7 in which the relation of a video with sound is set at prescribed time difference is inputted to a converter 8 by switching a switch 10, the time difference information is recorded after being converted to first subcode data in the recording medium. Hereafter, when the recording medium is reproduced, a switch 11 is switched, and the first subcode data is converted to the time difference in formation with a converter 9, and it is inputted to an adder 6. The information is added with adder 6 on time information converted from second subcode data in the recording medium with a converter 3, and the reproducing speed of the recording medium is controlled. Thereby, it is possible to dispense with the re-setting of the time difference information even when the recording medium to be reproduced is exchanged.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a digital signal recording and reproducing apparatus such as a digital audio tape recorder having a phase adjustment function that controls the recording and reproducing position of a recording medium based on externally supplied time information. It is.

Conventional technology Conventionally, digital audio table recorder (hereinafter referred to as DAT)
Some digital signal recording and reproducing devices, such as the 1990-2000, can perform phase adjustment operations with external equipment. What is phasing operation?2
This is to synchronize and reproduce audio, video, etc. recorded on two different recording media when playing back the two recording media.

For example, the video may be recorded using a videotape recorder (VTR under LX).
When audio is recorded on a DAT, time information (time code) as sub information indicating the relationship between the audio and video signals as main information and the absolute position of the tape is recorded at the same time. When playing back, the time information played back from the VTR is supplied to the DAT, and the DAT compares the time information played back from the DAT with the time information from the VTR and controls the operation of the DAT, thereby recording data on the DAT. The relationship between the playback position of the medium and the playback position of the recording medium of the VTR is associated.

Furthermore, the relationship between the two pieces of time information allows an arbitrary time difference to be set during playback so as to reproduce the relationship between video and audio at the time of recording.

Hereinafter, an example of a conventional digital signal recording/reproducing apparatus having a phase adjusting function for controlling the recording/reproducing position of a recording medium based on externally supplied time information will be described.

FIG. 2 is a structural diagram of the conventional digital signal recording and reproducing apparatus.

During recording, the time information output from the time information generator 1 is
The signal is input to the fourth converter 2, converted into subcode data in the recording medium, output, and recorded in the recording medium. Further, during playback, the subcode data in the recording medium is converted into time information by the third conversion B3 and output to the adder 6, and the adder 6 converts the subcode data into time difference information set by the time difference information setting device 7. The time information output from the third converter 3 is added and output to the comparator 4. The comparator 4 compares the time information output from the adder 6 with the time information supplied from the outside, and outputs data representing the difference between the two to the controller 5. III
The Jtll unit 5 determines the playback position of the recording medium based on the data representing the difference from the comparator 4, and determines the playback position of the recording medium if the time information from the adder 6 lags behind the time information supplied from the outside. is faster than normal playback, and if the time information from the adder 6 is ahead of the time information supplied from the outside, the playback of the recording medium is controlled to be slower than normal playback.

With the above configuration, the running of the recording medium is controlled so that the time information from the subcode data in the recording medium maintains the desired time difference set by the time difference information setting device 7 with respect to the time information supplied from the outside. There is.

Problems to be Solved by the Invention However, in the conventional configuration as described above, time difference information is originally a chain uniquely determined in consecutive sections of time information recorded on a recording medium. Each time it is replaced, the settings must be made again, and the time difference information must be stored separately.

The present invention solves the above-mentioned problems, and aims to provide a digital signal recording and reproducing apparatus that does not require setting time difference information again even if the recording medium to be reproduced is replaced.

Means for Solving the Problems In order to solve the above problems, the digital signal recording and reproducing device 8f of the present invention is a digital signal recording and reproducing device that records and reproduces subcode data in a subcode area in a recording medium, a first converter that converts information into first subcode data in a recording medium; and a second converter that converts first subcode data reproduced from the recording medium into time difference information.
a third converter for converting second subcode data of time information recorded on the recording medium into time information, which is reproduced from the recording medium; an adder that adds the time difference information and the time information output from the third converter; a comparator that detects the difference between the time information supplied from the outside and the time information output from the hook brightener; and a controller that receives the output of the comparator and controls the recording/reproducing position of the recording medium so that the difference detected by the comparator disappears.

Operation With the above configuration, the time difference information is converted into the first subcode data in the recording medium in the first converter and is recorded, so that even if the recording medium to be played back is replaced during playback, the time difference information is converted into the first subcode data in the medium. By using the time difference information converted from the first subcode data reproduced from the recording medium as input to the adder, there is no need to set the time difference information again, and correspondence between the time difference information and the recording medium can be established. I can do it.

EXAMPLE An example of the present invention will be described below based on the drawings. Note that the same structures as those of the conventional example are given the same reference numerals, and the description thereof will be omitted.

Figure 1 shows an embodiment of the present invention. FIG. 2 is a configuration diagram of a digital signal recording/reproducing unit.

The digital signal recording and reproducing apparatus of the present invention inputs the time difference information set by the time difference information setting device 7 to the conventional example II/J shown in FIG. First converter 8 converting into first subcode data
and a second converter 9 that converts the first subcode data reproduced from the recording medium into time difference information and outputs it to the adder 6 via the second switch 11.

The operation according to the above structure will be explained. Note that the subcode data of time information will be referred to as second subcode data hereinafter.

First, the operation during recording will be explained.

The time information output from the time information generator 1 is input to the fourth converter 2, converted into second subcode data in the recording medium, and recorded.

Next, the operation during playback will be explained.

The second subcode data in the recording medium is converted into time information by the third converter 3 and output to the adder 6.

The time difference information set by the time difference information setting device 7 is
It is output to the adder 6 through the first switch 10. The adder 6 adds the time difference information output from the time difference information setter 7 and the time information output from the third converter 3 and outputs the result to the comparator 4.

The comparator 4 compares the time information output from the adder 6 with the time information supplied from the outside, and outputs data representing the difference between the two to the limiter 5. The controller 5 determines the playback position of the recording medium based on the data representing the difference from the comparator 4, and adjusts the playback position of the recording medium if the time information from the adder 6 lags behind the time information supplied from the outside. is faster than normal playback, and if the time information from the adder 6 is ahead of the time information supplied from the outside, the playback of the recording medium is controlled to be slower than normal playback. I do it. Further, a time difference is set by the time difference information setting device 7 so that the time information from the second subcode data in the recording medium maintains a desired time difference with respect to the time information supplied from the outside. In this way, time difference information in consecutive sections of time information recorded on the recording medium is obtained.

Next, when the switch 10 of tfJ1 is switched and the time difference information output from the time difference information setting device 7 is inputted to the first converter 8, the time difference information is converted to the first subcode data in the recording medium in the first converter 8. It is converted and recorded. When reproducing the recording medium on which the time difference information has been recorded in this way, the second switch 11 is switched to convert the first subcode data into time difference information by the second converter 9 and input it to the adder 6. In this way, the time difference information once set can be reproduced.

As described above, the first converter 8 converts time difference information into the first subcode data in the recording medium, and the second converter 8 converts the first subcode data reproduced from the recording medium into time difference information. a converter 9 and a third converter 3 that converts the second subcode data reproduced from the recording medium into time information.
and an adder 6 that adds the time difference information of the second converter and the time information of the output of the third converter, and the difference between the time information supplied from the outside and the time information of the output of the adder. By having a comparator 4 that detects the difference, and a controller 5 that inputs the output of the comparator 4 and controls the recording/reproducing position of the recording medium so that the difference detected by the comparator 4 disappears, The set time difference information can be recorded in association with the recording medium, and by reproducing this time difference information, it is possible to eliminate the need to reset the time difference information.

Effects of the Invention As described above, according to the present invention, by recording time difference information as first subcode data in a recording medium,
Even if the recording medium to be reproduced during reproduction is replaced, by reproducing the first subcode data, it is possible to eliminate the need to set the time difference information again, and it is possible to make correspondence between the time difference information and the recording medium.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a digital signal recording and reproducing apparatus showing an embodiment of the present invention, and FIG. 2 is a 411 diagram of a conventional digital signal recording and reproducing apparatus. DESCRIPTION OF SYMBOLS 1...FJFI information generator, 2...4th converter, 3...3rd converter, 4...comparator, 5...controller, 6...paralysis device, 7... time difference information setting device, 8
...first converter, 9...second converter, 10...
- First switch, 11... second switch.

Claims (1)

[Claims] 1. A digital signal recording and reproducing device that records and reproduces subcode data in a subcode area in a recording medium, a first converter that converts time difference information into first subcode data in the recording medium; The first reproduced from the recording medium
a second converter that converts the subcode data of the above into time difference information; and a third converter that converts the second subcode data of the time information recorded on the recording medium, which is reproduced from the recording medium, into time information. an adder that adds time difference information of the output of the second converter and time information of the output of the third converter, and time information supplied from the outside and time information of the output of the adder. A digital signal recording and reproducing device, comprising: a comparator that detects a difference between the two; and a controller that receives the output of the comparator and controls the recording and reproducing position of the recording medium so that the difference detected by the comparator disappears. .