JPH0487004A - 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] Industrial applications The present invention relates to a recording/reproducing device for dubbing.

BACKGROUND OF THE INVENTION In recent years, recording and reproducing apparatuses such as video tape recorders are required to perform editing operations many times, resulting in an increasing number of dubbing operations. However, there is a problem in that the signal deteriorates as the number of dubbing increases.

An example of a conventional recording/reproducing device will be described below with reference to the drawings. FIG. 3 is a block diagram of a conventional recording/reproducing device. In FIG. 3, 31 is an input means for inputting a signal, 32 is a recording frequency characteristic adjustment means for adjusting the frequency characteristics of the input signal, 33 is a recording characteristic adjustment means including the recording frequency characteristic adjustment means 32, and 34 is for recording a signal. 36 is a reproduction frequency characteristic adjustment means for adjusting the frequency characteristics of the reproduction signal; 37 is an S/N improvement means for reducing noise in the reproduction signal; 38 is a reproduction frequency characteristic adjustment means 36 and S/N improvement of 6; Reproduction characteristic adjustment means 35 includes recording characteristic adjustment means 33 and reproduction characteristic adjustment means 38.
A changeover switch 39 is a reproduction signal output means.

The operation of a conventional recording/reproducing apparatus equipped with each of the above means will be explained below. For dubbing, use one playback device,
The other device is connected as a recording device as shown in FIG. First, in the reproducing apparatus, a signal recorded on a magnetic tape is reproduced by the head 34, and the reproduction characteristic adjusting means 38
The reproduction frequency characteristic adjustment means 36 in the control section adjusts the reproduction frequency characteristic to be suitable for dubbing, the S/N improvement means 37 improves the S/N so that the deterioration of minute signals is small and suitable for dubbing, and the output means 39 sends out the reproduction signal. do.

The reproduction characteristic adjusting means 38 is switched between normal reproduction and dubbing by manually switching the switch 35. next,
In the recording apparatus, a signal is inputted through the input means 31, the recording frequency characteristic adjusting means 32 in the recording characteristic adjusting means 33 adjusts the recording frequency characteristic suitable for dubbing, and the head 34 records on the magnetic tape. The recording characteristic adjustment means 33 is switched between normal recording and dubbing by manually switching the switch 35.

Problems to be Solved by the Invention These conventional recording and reproducing devices have the disadvantage that when dubbing is performed many times, such as when editing is performed many times, the signal deteriorates significantly as the number of dubbing increases. was.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a recording and reproducing apparatus that can minimize signal deterioration during dubbing.

Means for Solving the Problems In order to achieve the above object, the present invention includes a dubbing number writing means for recording the number of copies, a dubbing number reading means for detecting the number of copies, and adjusting recording characteristics based on the number of dubbings. a recording characteristic adjusting means, a reproduction characteristic adjusting means for adjusting the reproduction characteristic according to the number of dubbing, and a dubbing number writing means, the recording characteristic adjusting means, and the reproduction characteristic adjusting means according to the information obtained from the dubbing number reading means. and a control means for controlling.

Function The present invention is arranged so that the number of dubbings is recorded on the tape and the recording characteristics and the reproduction characteristics are controlled based on the information on the number of dubbings, so that the deterioration of the signal during dubbing can be prevented. This can be suppressed to a minimum.

Embodiment Hereinafter, a recording and reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a recording/reproducing apparatus according to an embodiment of the present invention.

In FIG. 1, 1 is an input means for inputting a signal, 2 is a dubbing number reading means for reading out the number of times a signal has been copied, and 3
4 is a recording frequency characteristic adjusting means for adjusting the frequency characteristic of the input signal; 6 is a recording characteristic adjusting means including the recording frequency characteristic adjusting means 4; and 7 is for recording and reproducing the signal. The head includes reproduction frequency characteristic adjustment means 8 for adjusting the frequency characteristics of the reproduction signal, e S/N improvement means for reducing noise in the reproduction signal, and 10 includes reproduction frequency characteristic adjustment means 8 and S/N improvement means 9. a reproduction characteristic adjustment means; 6 a control means for controlling the dubbing number writing means 3, the recording characteristic adjustment means 5, and the reproduction characteristic adjustment means 1o according to the value obtained from the dubbing number reading means 2;
11 is an output means for sending out a reproduction signal. The operation of the recording/reproducing apparatus of this embodiment including the above-mentioned blocks will be described below with reference to FIGS. 1 and 2. Dubbing is performed by connecting one device as a playback device and the other as a recording device as shown in FIG. In the reproducing apparatus, the signal recorded on the magnetic tape is reproduced by the head 7 9, and the dubbing number reading means 2 reads out the number of times the signal has been copied (dubbed) so far. Next, the reproduction frequency characteristic adjustment means 8 in the reproduction characteristic adjustment means 1o sets the reproduction frequency characteristic most suitable for the current number of dubbing, and the S/N improvement means 9 sets the reproduction frequency characteristic most suitable for the current number of dubbing with less deterioration of the minute signal. Improve S/N. Then, the signal is sent out by the output means 9. Switching of the reproduction characteristic adjusting means 1o between normal reproduction and dubbing and controlling the adjustment amount most suitable for the number of dubbing are performed by the control means 6 based on the information obtained from the number of dubbing reading means 2. On the other hand, in the recording apparatus, the input means 1 inputs a signal, and the dubbing number reading means 2 reads out the number of copies made so far. Then, the recording frequency characteristic adjusting means 4 in the recording characteristic adjusting means 5 sets the recording frequency characteristic most suitable for the current number of dubbings, and the head 7 records on the magnetic tape. Switching of the recording characteristic adjusting means 5 between normal playback and dubbing and controlling the adjustment amount most suitable for the number of dubbing are performed by the control means 6 based on the numerical value obtained from the number of dubbing reading means 2. Further, the dubbing number writing means 3 writes a new dubbing number obtained by adding 1 to the numerical value obtained from the dubbing number reading means 2. The recording of the number of dubbings is superimposed on the video signal immediately after the vertical synchronization period of the video signal. In addition, the number of dubbings can be recorded using a dedicated track, an audio signal track, superimposing on an audio signal, superimposing on a time code signal, superimposing on a tracking signal, using an index area, etc. Furthermore, only one of the recording characteristic adjusting means and the reproducing characteristic adjusting means may be used.

As described above, the recording and reproducing apparatus according to the embodiment of the present invention is arranged to perform various adjustments based on the record of the number of copies, so that signal deterioration during dubbing can be suppressed to a minimum. can.

Effects of the Invention As is clear from the above embodiments, according to the present invention, the number of copies is recorded on the magnetic tape, and the recording characteristics are optimally adjusted based on this information. It is possible to provide a recording/reproducing device that can minimize signal deterioration during dubbing.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a recording and reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a connection diagram of the recording and reproducing apparatus during dubbing, and FIG. 3 is a block diagram of a conventional recording and reproducing apparatus. 2... Dubbing number reading means, 3...
Dubbing number writing means, 6... Recording characteristic adjustment means, 6... Control means, 1o... Reproduction characteristic adjustment means. Name of agent: Patent attorney Shigetaka Awano and 1 other name! Figure 5--1 note ■Moyocho μ step 7---To Sodo 10-Ichikaku survival N condolence Q Figure 2 No. 3 Figure 38-Ichishiki 9? 4 kills

Claims (1)

[Claims] A dubbing number writing means for recording the number of times of copying, a dubbing number reading means for detecting the number of copies, a recording characteristic adjusting means for adjusting recording characteristics according to the number of dubbings, and a reproduction characteristic adjustment means for adjusting reproduction characteristics according to the number of dubbings. and a control means for controlling the dubbing number writing means, the recording characteristic adjusting means, and the reproduction characteristic adjusting means based on the information obtained from the dubbing number reading means.