JPS5921106B2 - editing correction device - Google Patents

Description

Detailed Description of the Invention The present invention converts an analog signal into a digital signal, records the pulse code modulated (hereinafter referred to as PCM) signal on a video tape recorder (hereinafter referred to as VTR), and edits the signal. The present invention relates to an editing correction device for cases.

Conventionally, splice editing methods have been widely used in which only necessary portions of magnetic media on which audio band signals are recorded are spliced together.

Generally, a first analog-recorded signal 5 as shown in FIG. 2 is recorded on the first tape recorder 1 shown in FIG. 1, and a second analog-recorded signal 6 as shown in FIG. , recorded on the second tape recorder 2 shown in FIG.
fade out the signal 5 more in time and at the same time the second
Variable resistors VR, , V are connected to the output sides of tape recorders 1 and 2 so that the signals of
R2 is varied and its output is supplied to the third tape recorder 4 through the AND circuit 3, thereby editing only the necessary portions of the signals recorded on the first and second tape recorders 1 and 2.

However, in the conventional case as described above, since it is not a splice editing method, many tape recorders are required, and when performing this with a digitally recorded VTR, three VTs are required.
Not only does it require R, but it is also very difficult to synchronize them at the same time. Therefore, in the present invention, editing is performed using a magnetic medium to which necessary parts are bonded in advance with splicing tape.
However, when a magnetic medium that has been edited and digitally recorded in advance is played back in this way, an abnormal sound is generated at the editing point. Such abnormal sounds occur not only at editing points but also at data error points. Of course, it is also possible to fade out and fade in the occurrence of such abnormal sounds. However, just fading out and fading in gives the impression that the sound has disappeared at the editing point or data error point, and the reproduced sound is not completely edited. Therefore, the present invention uses close fade to eliminate the above-mentioned drawbacks.

The present invention will now be described in detail with reference to FIGS. 3 through T. As shown in FIG. 3, a plurality of magnetic media Ta, Tb, Tc, .
..., splicing tape Ba, 8b, ...
Edited by... At this time, it is assumed that a digital signal converted into PCM is recorded on each magnetic medium.
Assuming that the magnetic media Ta, Tb, etc. are now moving in the direction of arrow A, the PCM digital signal taken out from the magnetic head 9, which is similar to the rotating head of a VTR, etc. , and is added to the storage circuit 10 via a suitable amplification circuit (not shown).

This storage circuit 10 has a structure such as a shift register, and a recording signal at the end of a first magnetic medium 7a to which a first splicing tape 8a is attached is stored in, for example, a first storage section 10a of the shift register. memorized,
Furthermore, the recording signal of the starting end of the second magnetic medium 7b to which the first splicing tape 8a is attached is stored in the second storage section 10b of the shift register, and The recording signal at the end of the second magnetic medium 7b is stored in the third storage section 10c of the shift register, and the recording signal at the beginning of the third magnetic medium 7c to which the second splicing tape 8b is attached is stored. , are stored in the fourth storage section 10d.
Thereafter, similarly, the digital signals recorded at the beginning and end of the magnetic medium to which the splicing tape is attached are stored in the fifth, sixth, . . . storage sections of the shift register. Each storage section 10a, 10b of the storage circuit 10 of Dojo
Signals FO, FI, FO taken from the terminal of ...
, FIl... are added to the arithmetic circuit 11. The arithmetic circuit 11 may be a multiplication or division circuit, etc., and this is the same as the memory circuit 1.
The output from 0 is faded out or faded in, closed faded, and the output is taken out as an analog signal to the output terminal 13 via the digital-to-analog conversion circuit 12. On the other hand, in order to detect the signals of the magnetic media 7a, 7b, . The signal is sent to the storage control circuit 1.
5, thereby detecting a data error point or editing point, and supplying the detection output to the storage circuit 10 to control its readout. Furthermore, the detection signal from the preceding head 14 is also supplied to the arithmetic control circuit 16. The output is supplied to the arithmetic circuit 11, and weighted control is performed to determine how to fade out and fade in. Since the present invention is configured as described above, the first
The storage control circuit 15 is controlled to take out the digital signal from the first storage section 10a, and the arithmetic control circuit 16 is also driven to extract the digital signal from the first storage section 10a, as shown in FIG.
The second storage section 1 after the splicing tape 8a attachment point is faded out.
The arithmetic circuit 11 is controlled to take out the digital signal 10b1 stored in the memory 0b and fade-in it.

In this case, the first storage section 10a and the second storage section 1
0b, third storage section 10c, and fourth storage section 10
d, the fifth storage section 10e, and the sixth storage section 10f.
The first, second, third...
...If you change the n-th editing point sequentially, you can perform close fade editing as shown in Figure 5.
The amplitude level is indicated by an envelope as shown by a curve 17, so that the reproduced sound does not feel as if it is lost at the editing point, and abnormal sounds can be prevented from occurring. In the case of the embodiment described above, the clock of the memory control circuit 15 for reading is set to have a period at equal intervals.
As shown in FIGS. A and B, the interval of the clock from the memory control circuit 15 at the time when fade-out is started is changed at time 18, and for example, the clock period is gradually expanded, and after a period T has elapsed, the fade-in is started at time 19. Then, after the period T3 has elapsed, the clock period can be changed to the normal clock period, or if the period between the periods Tl and t3 is, for example, twice the normal clock period, as shown in FIG. A period T from the fade-out point 18a such as normal cycle clock edit points 8a, 8b, etc. to the edit point 8a has elapsed, and the fade-in period T4 also overlaps the period represented by the period T3, making it possible to increase the required number of memories. .

Since the present invention is constructed as described above, it is possible to obtain an editing correction device that reduces abnormal noises generated at splicing points of edited magnetic media.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a conventional close fade editing device, Fig. 2 is a first close fade explanatory diagram, Fig. 3 is a circuit diagram of a correction device of the present invention, and Figs. 4 and 5 are a diagram of the present invention. Graph for explaining the close fade editing method, Figure 6A
and B are explanatory diagrams of a clock of a correction device showing another embodiment of the present invention, and FIG. 7 is an explanatory diagram of a comparison between a normal clock and FIG. 6. In the figure, 1, 2, 4 are tape recorders, VR, VR
, is a variable resistor, 3 is an AND circuit, 7a, 7b, 7c・
... are magnetic media, 8a, 8b... are editing points, 9, 14 are magnetic heads, 10 is a storage circuit, 10a--
10f is its storage section, 11 is an arithmetic circuit, 12 is an analog-to-digital conversion circuit, 15 is a storage control circuit, and 16 is an arithmetic leg circuit.

Claims (1)

[Claims] 1. In order to correct the digital signal recorded on the magnetic medium, extract the digital signal from the edited magnetic medium that has been pasted and edited with splicing tape, store it in a storage circuit, and read it from the last digit of the storage circuit. An editing correction characterized in that the digital signal is faded out, and the digital signal read from the middle digit of the storage circuit is faded in to obtain a close-faded digital signal, thereby reducing abnormal sounds generated during editing. Device.