JPH0528640A - Information reproducing device - Google Patents

Abstract

PURPOSE:To make it possible to output high quality sound at the time of reproducing even at a low reproducing speed, for example 1/N (N is integer), to make it possible to excute editing work in the same sense as a video tape recorder, etc., recording in a longitudinal direction, for example, at the time of editing and to make it possible to improve the workability of editing by alternately writing PCM sound signals in two field memories corresponding to reproducing speed and reading alternately the PCM sound signals from the two field memories at the number of times corresponding to the reproducing speed. CONSTITUTION:An information reproducing device which reproduces information recorded so as to form a inclined track with a specified unit on a disk by a rotary head is provided with the field memories 2 and 3 having capacity corresponding to the specified unit. The PCM sound signals are written in the field memories 2 and 3 corresponding to the reproducing speed and the PCM sound signals are read from the field memories 2 and 3 at the number of times corresponding to the reproducing speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention records information signals such as a digital audio tape recorder (DAT) and a so-called 8 mm video tape recorder in which a rotary head is used to form an inclined track. The present invention relates to an information reproducing device suitable for being applied to an information reproducing device for reproducing a magnetic tape.

[0002]

2. Description of the Related Art Conventionally, so-called 8 mm video tape
In the recorder, the video signal, the FM audio signal, and the time-axis-compressed PCM audio signal are reproduced by the two heads so as to alternately reproduce the field-recorded magnetic tape so as to form an inclined track on the recording surface. ing.

When reproducing at a speed lower than the normal speed, the rotary head scans the same track formed on the magnetic tape a plurality of times according to the slow reproduction speed, so that the same PCM audio signal is output a plurality of times. To be done.

For example, as shown in FIG. 4A, "A", "I", "U", "E", "O" ... For each field.
When a magnetic tape on which the voice of is recorded is reproduced at a normal reproduction speed, “A”, “I”, and
"U", "E", "O" ... are reproduced.

However, as described above, for example, when reproduction is performed at a speed of 1/3 of the normal reproduction speed, as shown in FIG. 4B, "a", "a", and "a" for each field, respectively.
"A", "I", "I", "I", "U", "U",
"U", "Eh", "Eh", "Eh", "Oh", "Oh",
"O" ... is played.

Therefore, as shown in FIG. 4, the same voice (for example, "a" is repeated three times) is reproduced a plurality of times in succession, which may cause the viewer to feel uncomfortable. Then, when the reproduction speed is slow, the PCM sound is muted and the reproduced sound is not output.

The following method is used in a digital audio tape recorder (DAT) for recording a PCM audio signal on a magnetic tape so that a rotary head forms an inclined track.

That is, when reproducing at a reproduction speed slower than the normal reproduction speed or when performing reproduction at a desired reproduction speed using the jog dial, that is, when performing so-called jog reproduction, the PCM audio signal of the reproduction portion is stored in the memory in advance. Then, the PCM audio signal is read out from the memory according to the reproduction speed when performing the slow reproduction or the jog reproduction, and the audio is reproduced as if reproduced from the compact cassette tape, that is, the recording medium in which the audio signal is recorded in the longitudinal direction. I am trying to output.

[0009]

As described above, conventionally, when a PCM audio signal is reproduced at a speed slower than the normal reproduction speed, the same sound is reproduced a plurality of times, which causes a trouble for the viewer to hear. It was

In order to avoid this, if the PCM audio signal is muted as described above, there is a disadvantage that the usability becomes poor when, for example, editing work is performed.

Further, the digital audio
When a PCM audio signal is stored in a memory like a tape recorder, a memory having a large capacity is required, which causes a problem of cost increase.

The present invention has been made in view of the above points, and has a minimum storage capacity and a slow reproduction speed,
For example, good audio can be output even when played back at 1 / N (N is an integer), which enables editing work to be performed in the same sense as a video tape recorder that records in the longitudinal direction when editing, for example. It is an object of the present invention to propose an information reproducing apparatus that can be performed and can improve editing workability.

[0013]

The information reproducing apparatus of the present invention is, for example, as shown in FIGS. 1 to 3, an information reproducing apparatus which reproduces information recorded by forming a tilted track on a recording medium in a predetermined unit by a rotary head. The apparatus has storage means 2 and 3 having a capacity corresponding to a predetermined unit, writes information in the storage means 2 and 3 according to the reproduction speed, and reads information from the number-of-times storage means 2 and 3 according to the reproduction speed. It is the one.

[0014]

According to the present invention described above, the information is written in the storage means 2 and 3 according to the reproduction speed, and the information is read from the number-of-times storage means 2 and according to the reproduction speed.
In addition to having a minimum storage capacity, good audio can be output even when played back at a slow playback speed, for example, 1 / N (N is an integer), which allows video to be recorded in the longitudinal direction during editing, for example. -Editing work can be performed with the same feeling as a tape recorder, and the workability of editing can be improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIG.

In FIG. 1, reference numeral 1 denotes a PCM from the main body of an 8 mm video tape recorder, not shown.
An PCM audio signal is supplied to the field memories 2 and 3 via the input terminal 1 through which an audio signal is supplied.

Reference numeral 11 denotes an input terminal to which a PCM audio signal (RF signal) from the main body of the 8 mm video tape recorder (not shown) is supplied, and the PCM audio signal (RF signal) is supplied via this input terminal 11. It is supplied to the RF detection circuit 7.

The RF detection circuit 7 detects the reproduction state of the PCM audio signal (RF signal) from the input terminal 11 and supplies the detection result to the address controller 8.

The address controller 8 is based on the detection result from the RF detection circuit 7 and the field memory 2 described above.
An address signal is supplied to each of 3 and 3, and a control signal is supplied to the timing controller 9.

The timing controller 9 includes a control signal from the address controller 9 and an illustration of the control signal 8 omitted.
A control signal is supplied to each of the field memories 2 and 3 and the switch 4 based on the reproduction speed information from the main body of the millivideo tape recorder.

The movable contact 4c of the switch 4 is connected to the input end of the low-pass filter 5, one fixed contact 4a of the switch is connected to the output end of the field memory 2, and the other fixed contact 4b of the switch 4 is connected. It is connected to the output end of the field memory 3.

In the switch 4, the movable contact 4c is connected to the fixed contact 4a when the control signal from the timing controller 9 is, for example, high level "1", and the movable contact 4c is connected when the control signal is, for example, low level "0". It is designed to be connected to the fixed contact 4b.

PCM read from the memory 2 or 3
The audio signal is supplied to the output terminal 6 via the switch 4 and the low pass filter 5. And this output terminal 4
Is supplied to the output system of, for example, the 8 mm video tape recorder main body, subjected to predetermined output processing, and then supplied to a so-called amplifier via an output terminal (PCM output or analog output). It is supplied to a speaker or the like through an amplifier and output as sound.

The operation of the information reproducing apparatus of this embodiment will be described with reference to FIGS.

First, for example, when the speed is 1/3 of the normal reproduction speed, the PCM audio signal supplied to the input terminal 1 is the same PCM audio signal on the magnetic tape three times as shown in FIG. 3A. Since the audio data “a” is reproduced, “a”, “a”, and “a” are reproduced, and the audio data “b” is reproduced.
Is reproduced as "b", "b", "b", audio data "c" is reproduced as "c", "c", "c", and audio data "d" is "d", "d" , "D" is reproduced.

At this time, the RF detection circuit 7 shown in FIG.
Similarly, when the reproduction state of the PCM audio signal (RF signal) supplied from the input terminal 11 is good, the control signal is supplied to the address controller 8.

The address controller 8 supplies the address signals to the field memories 2 and 3, respectively, and the timing controller 9 by the control signal.

The timing controller 9 supplies write and read control signals to the field memories 2 and 3, respectively, according to the control signal from the address controller 8.

Thus, as shown in FIGS. 2B and C,
The PCM audio signal “a” in the good reproduction state reproduced for the second time is written in the field memory 2.

After this, the timing controller 9
Sets the control signal supplied to the switch 4 to the high level "1".

Thus, the movable contact 4c of the switch 4 is connected to the fixed contact 4a.

At the same time, the PCM audio signal a written in the field memory 2 for one field is read by the read control signal from the timing controller 9.

In the next field, as shown in FIG. 2C, the write control signal from the timing controller 9 writes the PCM audio signal which is reproduced in the good reproduced state in the field memory 3 for the second time.

Then, the read control signal from the timing controller 9 is supplied to the field memory 3, the PCM audio signal b is read from the field memory 3 for one field, and the control signal (low level "" is supplied to the switch 4). 0 ″) is supplied to connect the movable contact 4c of the switch 4 to the fixed contact 4b.

In the next field, as shown in FIG. 2B, a write control signal from the timing controller 9 writes the PCM audio signal reproduced in the second reproduction in a good reproduced state into the field memory 2.

Then, the read control signal from the timing controller 9 is supplied to the field memory 2, the PCM audio signal c is read from the field memory 2 for one field, and the control signal (high level "" is output to the switch 4). 1 ") is supplied to connect the movable contact 4c of the switch 4 to the fixed contact 4a.

In the next field, as shown in FIG. 2C, a write control signal from the timing controller 9 writes the PCM audio signal reproduced in the second reproduction in a good reproduced state into the field memory 3.

The read control signal from the timing controller 9 is supplied to the field memory 3, the PCM audio signal d is read from the field memory 3 for one field, and the control signal (low level "" is supplied to the switch 4). 0 ″) is supplied to connect the movable contact 4c of the switch 4 to the fixed contact 4b.

Then, similarly, writing to the field memory 2 and reading for one field, and writing to the field memory 3 and reading for one field are performed alternately.

Thus, as shown in FIG. 2D, the low-pass filter 5 is sequentially supplied with the PCM audio signals a, b, c, d ...

Then, these PCM audio signals are waveform-shaped by the low-pass filter 5 as shown in FIG. 3B in the same manner as the normal waveform shaping shown in FIG. 3A, and then supplied to the output terminal 6.

Then, through this output terminal 4, for example, 8
It is supplied to the output system of the Milli-video tape recorder main body, and after being subjected to predetermined output processing, it is supplied to a so-called amplifier via an output terminal (PCM output or analog output), and then supplied to a speaker etc. through this amplifier. And output as voice.

Thus, the minimum storage capacity can be achieved, and good sound can be output even when reproduced at a slow reproduction speed, for example, 1 / N (N is an integer). Video tape to record in any direction
You can perform editing work with the same feeling as a recorder,
The workability of editing can be improved. Further, in the present example, among the same audio data reproduced a plurality of times, one having a good reproduction state (for example, one having a small number of error flags) is selected, so that excellent reproduction can be performed.

In this example, the case where the present invention is applied to the 8 mm video tape recorder has been described. However, if the apparatus reproduces a recording medium on which a signal is recorded so that an inclined track is formed by a rotary head, the present invention is applicable. It can be applied similarly to the example.

Further, the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0046]

According to the present invention described above, since the information is written in the storage means according to the reproduction speed and the information is read from the number-of-times storage means according to the reproduction speed, the minimum storage capacity can be obtained. , Slow playback speed, eg 1 / N
Good sound can be output even when played back with (N is an integer), so that for example, when editing, editing work can be performed with the same feeling as a video tape recorder or the like that records in the longitudinal direction. , There is a benefit that can improve the editing workability.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an information reproducing apparatus of the present invention.

FIG. 2 is an explanatory diagram for explaining an embodiment of the information reproducing apparatus of the present invention.

FIG. 3 is an explanatory diagram for explaining an embodiment of the information reproducing apparatus of the present invention.

FIG. 4 is an explanatory diagram for explaining a conventional information reproducing apparatus.

[Explanation of symbols]

 2, 3 Field memory 4 Switch 5 Low pass filter 7 RF detection circuit 8 Address controller 9 Timing controller

Claims (1)

Claim: What is claimed is: 1. An information reproducing apparatus for reproducing information recorded on a recording medium to form an inclined track in a predetermined unit by a rotary head, wherein a storage means having a capacity corresponding to the predetermined unit is provided. And having the above-mentioned information written in the storage means according to the reproduction speed,
An information reproducing apparatus, wherein the information is read from the storage means a number of times according to the reproducing speed.