JPH04178902A - playback device - Google Patents

Abstract

PURPOSE:To enable two channels to be reproduced simultaneously by scanning two-channel range with a reproduction head and by converting the data which is reproduced in the reverse direction to data in the forward direction by write/ read with a memory means. CONSTITUTION:Recorded data in CH1 can be reproduced in the forward direction, while data in CH2 can be reproduced in the reverse direction. A magnetic head 12 scans entire width of a magnetic tape 10 and the output is amplified by a head amplifier 14, is demodulated by a demodulation circuit 16, and then is written into a memory 18. An image processing circuit 20 controls a memory 18 through a memory control circuit 32, reads data in CH1 in the order of writing, and then reads data in CH2 after converting it in forward direction, thus enabling 2-channel recording information to be reproduced simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reproducing apparatus, and more specifically to a reproducing apparatus for information recorded in two channels on a tape-shaped recording medium.

[Prior Art] Two-channel recording in which information is recorded on one side of a magnetic tape, and information can also be recorded on the opposite side by reversing the tape/cassette that houses the magnetic tape. This method is well known for audio tapes, but this two-channel recording method is also used for video tapes.
It is also applied to the helical scanning recording and reproducing method used in recorders.

By performing high-density recording in two reciprocating channels in this way, it is possible to miniaturize the device and/or extend the recording time.

[Problems to be Solved by the Invention] As described above, when reproducing information recorded on two reciprocating channels of a magnetic tape, such as digital image data, in the conventional example, each channel was reproduced individually.

However, if the scanning range of the rotary head is expanded, it should be possible to reproduce two channels at the same time, and an object of the present invention is to provide a reproduction device that can reproduce two channels simultaneously.

[Means for Solving the Problems] A playback device according to the present invention is a playback device for a tape-shaped recording medium in which two channels are recorded in the opposite direction, and the playback head scans the range of the two channels, and It is characterized by converting the reproduced data in the forward direction by writing/reading the data in the memory means.

[Operation] With the above means, two channels of recorded information can be reproduced at once.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a circuit configuration block diagram of an embodiment of the present invention, and FIG. 2 shows a track pattern of a magnetic tape. In Figure 2, Al, Bl, CI, DI,... are the track patterns of channel 1 (CHI), and A
2. B2. C2, C2,... is channel 2 (C)
12) is the track pattern. Channel 1 is recorded sequentially from left to right in FIG. 2, and channel 2 is recorded sequentially from right to left. When reproducing a two-channel recorded magnetic tape as shown in Figure 2, if the direction in which the head scans the track is the same as during recording, the reproduction is in the forward direction in terms of time, and the direction in which the head scans the track is the same as during recording. If so, the playback is in the negative (reverse) direction in terms of time. Therefore, if the head scanning range is expanded to cover both C old and CH2, one channel will have positive reproduction and the other channel will have negative reproduction.

FIG. 1 will be explained. As shown in FIG. 2, 10 is a magnetic tape on which information data or digital image data is recorded in two channels, 12 is a playback head, and 14 is a head.
An amplifier, 16 is a demodulation circuit, 18 is a memory, 20 is an image processing circuit that converts the reproduced data of CHI and CH2 read from the memory 18 into image signals and outputs them, 22 is a first image output terminal, and 24 is a second image output terminal. image output terminal, 26 is memory 1
Output terminal for CHI playback data read from 8, 2
8 is an output terminal for the reproduction data of CH2 read from the memory 18; 30 is a mode switch that specifies normal playback or special playback; 32 is a memory control circuit that controls the memory 18 according to the mode specified by the switch 30; It is.

The operation shown in FIG. 1 during normal playback will be explained. It is assumed that the recorded data of CHI can be reproduced in the positive direction, and the data of CH2 can be reproduced in the negative direction. The magnetic head 12 is attached to the magnetic tape 1
The full width of 0 is scanned, and its output is amplified by the head amplifier 14, demodulated by the demodulation circuit 16, and written into the memory 18.

The image processing circuit 20 controls the memory 18 via the memory control circuit 32 to read out the data of CHI in the writing order, and read out the data of CH2 in the forward direction.

Of course, when writing data in the negative direction to the memory 18, the write address may be changed in the opposite direction to the normal direction, and when reading data, the same address change as CH1 may be used.

By reading this memory, the image processing circuit 20 has C
Image data is input manually in both H1 and CH2 in the forward direction, and is converted into an image signal by well-known processing.

The reproduced image of CHI is outputted from the output terminal 22 as a still image or a moving image, and the reproduced image of CH2 is outputted from the output terminal 24 as a still image or a moving image. Moreover, the output terminal 26.
From 28, CHI respectively.

The reproduced data of CH2 is output.

Special playback operations such as search, slow motion, and still motion will be explained. Specify special playback with mode switch 30. Special reproduction includes a control sequence in which the magnetic head 12 scans the entirety of one track, and a control sequence in which the magnetic head 12 scans a large number of tracks at one time.

When the head 12 scans one track, it scans one track each of CHI and CH2 located on the 1 m line at a time, and operates in the same way as in normal reproduction. That is, by writing and reading from the memory 18, negative direction reproduction data (C) (reproduction data of 2) is converted to a positive direction, converted into an image signal by the image processing circuit 20, and outputted to the output terminal 2.
Output from 2.24.

When the head 12 scans over several tracks, the magnetic head 12 scans the magnetic tape 10 until the image data stored in the memory 18 constitutes one screen. Once the necessary image data is written to the memory 18 in this way, data in the positive direction is read out in the same manner as during normal playback, and data in the negative direction is converted to the positive direction and read out. The image is outputted, subjected to image processing by the image processing circuit 20, and outputted from the output terminals 22 and 24 as a still image. By repeating such writing and reading to and from the memory 18, the reproduced image signal is transferred to the output terminal 22.
It is output from 24.

In the above embodiment, the reproduced image of CHI is output from the output terminal 22, and the reproduced image of CH2 is output from the output terminal 24, but of course, the reproduced images of CHI and CH2 are combined into one screen and output. You can.

[Effects of the Invention] As can be easily understood from the above explanation, according to the present invention, information recorded in two channels in opposite directions can be simultaneously reproduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 shows a track pattern on a magnetic tape. 10: Magnetic tape 12 playback heads 14 head amplifier 16: Demodulation circuit 18: Memory 20: Image processing circuit 22.24: Image output terminal 26.28 + data output terminal 30: Mode switch 32: Memory control circuit Tape running direction (CB2) Figure 2

Claims (1)

[Claims] A reproducing device for a tape-shaped recording medium recorded in two channels in the reverse direction, in which the range of the two channels is scanned by a reproducing head, and the data reproduced in the reverse direction is converted to the forward direction by writing and reading from a memory means. A playback device characterized by: