JPH0442487A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To always display a relative time for each recording unit at the time of reproducing by detecting a difference time between an absolute time recorded over the whole area and a 1st relative time recorded in the leading part of the recording unit and detecting a 2nd relative time after the leading part of the recording unit in accordance with the absolute time and the difference time. CONSTITUTION:A subdata part contained in a regenerative digital data is demodulated by a digital signal processing circuit 6, and a display data consisting of start information, the absolute time and a program time, etc., is sent out to a display device 7. Then, the absolute time is recorded over the whole area, and by using a recording medium (magnetic tape) 2 recorded with the 1st relative time for each recording unit in the leading part of the recording unit, a difference time between the 1st relative time obtained by reproducing the leading part of the recording unit and the absolute time is detected, and according to the absolute time and the difference time, the 2nd relative time is detected. By this method, the relative time of the recording unit is always displayed at the recording time.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a recording/reproducing device, and is suitable for application to, for example, a rotating head type digital audio recorder (DAT).

B. Summary of the Invention The present invention provides a recording and reproducing apparatus that detects a difference time between an absolute time recorded over the entire area of a recording medium and a first relative time recorded at the beginning of a recording unit, and detects the absolute time and the difference time. By detecting the second relative time according to the second relative time, the relative time for each recording unit can be displayed at all times during playback.

C. Prior Art Conventionally, on the recording track of a magnetic tape recorded in the DAT format, in addition to the main data section in which music, etc. is recorded as a digital audio signal, there is also start information representing the beginning of the song, program time, and absolute time. A sub-data section is formed in which the following information is recorded.

In practice, the start information is recorded as data with logic rH and level for about 9 seconds at the beginning of the song as a recording unit, and the program time is set in consideration of post-recording editing, so that the start information is relative to the logic rH and level. The elapsed time is recorded, and the absolute time, for example, the elapsed time from the beginning of the tape is recorded.

Therefore, the DAT reproduces the program time in the sub-data section during the start information, and counts the elapsed time after the program time using an internal timer such as a microcomputer for the song portion after the start information.

In this way, in the DAT, when absolute time display is specified by the user's selection, the absolute time in the sub data section is reproduced and displayed, and when program time display is specified, the program obtained as described above is displayed. It is designed to display the time.

D Problems to be Solved by the Invention However, in such a DAT, if an operation such as fast forwarding, rewinding, cueing, or reviewing is performed in the middle of a song,
It becomes impossible for the internal timer to count the elapsed time after the program time, and as a result, it becomes impossible to display the program time, and for example, only absolute time is always displayed regardless of the user's selection, resulting in poor usability. It was still insufficient in this respect.

The present invention has been made in consideration of the above points, and aims to propose a recording and reproducing apparatus that can always display the relative time of each recording unit during reproduction.

Means for Solving Problem Ee1 In order to solve this problem, in the present invention, the absolute time I) at is recorded in the entire area, and the recording unit PRGA
, PRG, , . . . , a recording/reproducing device 1 using a recording medium 2 in which a first relative time D□ for each recording unit PRG& , PRCI , . At the time of playback, the recording unit PRG, ,P
The difference time Δt between the first relative time DP□ (Dryl) and the absolute time Days (Dat+) obtained by reproducing the first part 5TIB of RG, , ...... is detected, and the absolute time DATt and the difference time are detected. The second relative time DPTt is detected according to Δt.

The absolute time D1 recorded in the entire area of the F-action recording medium 2 and the first relative time Dpy*(D
, □) is detected, and the absolute time is determined. and a second relative time period 2 according to the difference time Δt. ! By detecting the recording unit PRC;
, PRO, , old... relative time Dr? can be displayed.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, reference numeral 1 indicates the overall structure of a DAT according to the present invention, in which a magnetic tape 2 is wound around a drum 3, and audio data recorded on the magnetic tape 2 by a rotary head 4 attached to the drum 3 is recorded. The signal is read out and input to the reproduction signal processing circuit 5 as a reproduction signal S□.

The reproduced signal processing circuit 5 includes a reproduced amplifier circuit, an equalizer circuit, a binarization circuit, etc., and the reproduced digital data DPI obtained thereby is inputted to the digital signal processing circuit 6.

The digital signal processing circuit 6 includes a memory, a demodulation circuit, an error detection and correction circuit, a digital-to-analog conversion circuit, etc., and uses the memory to demodulate the reproduced digital data D□, detect and correct errors, and perform digital-to-analog conversion. Then, the analog signal obtained as a result is outputted to the outside as a reproduced audio signal AD□.

In addition, the digital signal processing circuit 6 demodulates the sub-data portion included in the reproduced digital data D□, and converts the display data D DIP consisting of start information, absolute time, program time, etc. into, for example, a front-emitting fluorescent display tube ( FL-
It is possible to display the absolute time or program time during playback.

In fact, as shown in FIG. 2, on the magnetic tape 2,
It has a main data area ARPC)l in the center where audio data is formed, and a main data area ARpe
, 4 before and after the first and second AT for tracking control.
F recording area ARATF+ and ARATF! , and furthermore, a first
and second sub-data area AR11I and ARsst
The recording track TR is formed in a format having the following format.

Here, as shown in FIG. 3, the sub data area ARsm
t and AR,. First, as sub data, songs consisting of recording units, that is, programs pRca, PRCI, . . .
Start information 5TII in the first 9 seconds of each
I (Fig. 3(A)) is recorded.

In addition, in the sub-data area A Rs□, AR3B, the absolute time Day (Fig. 3 (B)), which is the elapsed time from a predetermined position (for example, the beginning) of the magnetic tape 2, and post-recording editing are taken into account. Then start information ST. is logical rH
, a program time DPT consisting of a relative elapsed time between levels is recorded as sub-data.

In this embodiment, the digital signal processing circuit 6 is
First, the start information ST, the absolute time I)at of the timing of rising to the level (that is, when the program time D□. is the value "0"), my logic r)(" level.

is stored in the internal memory as a difference time Δt.

Next, the digital signal processing circuit 6 enters the sub data area A.
Obtain the absolute time I)aTt recorded as sub-data of Rsm+ and ARsmz, and subtract the difference time Δt from the absolute time I)at, and use the time data obtained as the program time for display.1. Display data D as 3. Set to .

The digital signal processing circuit 6 also processes the program PRC;
, , PRCI, ...... is started from a period in which the start information 5TID has the logic r)('' level, the sub data area A Rs and A Rs
Absolute time recorded as sub-data of □ I) ar
Subtract the program time D□ from t, and use the resulting time data as the difference time Δt(Day+Dry+
) in the internal memory.

In this way, for example, fast forwarding, rewinding or cueing,
Program time Dr? Even if the program time D PT! moves to a position where it is not recorded, the program time D PT! can be obtained.

According to the above configuration, the absolute time DAT recorded in the entire area of the recording track TR and each program PRG1, PRG
The start information ST+e of ,,... is logical rH,
Program time DP recorded during the period with level
Detect the difference time Δt from T and determine the absolute time DA? and the programs PRG, , PROW , and according to the difference time Δt.
By detecting and displaying the program time DPT after the start information ST+m of ..., recording and playback can always display the program time of each program PRG, pRct, .... Device 1 can be realized.

In the above-described embodiment, the present invention was applied to a DAT, but the present invention is not limited to this. Absolute time is recorded over the entire recording track, and the relevant time is recorded at a predetermined portion at the beginning of the recording unit. The present invention can be widely applied to recording and reproducing apparatuses that use recording media on which relative time for each recording unit is recorded.

H Effects of the Invention As described above, according to the present invention, the difference time between the absolute time recorded over the entire recording track and the first relative time recorded at the beginning of the recording unit is detected, and the absolute time and the difference are detected. By detecting the second relative time after the head portion of the recording unit according to the time, it is possible to realize a recording and reproducing apparatus that can always display the relative time of each recording unit during reproduction.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a rotary head type audio tape recorder according to the present invention, FIG. 2 is a route diagram for explaining the recording format of a magnetic tape, and FIG. 3 is a diagram showing a program time calculation method according to the embodiment. It is a route map provided for explanation. 1...DAT, 2...Magnetic tape, 6
...Digital signal processing circuit, PRGa, P
RGm・・・Program, ST, wa・・・・・・
Start information, Dl, DAT@% DATI % Da
Tt...Absolute time, DPT, I) rt. , Dp
r+, Dpya...Program time.

Claims (1)

[Claims] In a recording/reproducing apparatus using a recording medium in which absolute time is recorded over the entire area and a first relative time for each recording unit is recorded at the beginning of the recording unit, during reproduction, the above-mentioned recording is performed. A difference time between the first relative time and the absolute time obtained by reproducing the first part of the unit is detected, and a second relative time is detected according to the absolute time and the difference time. A recording/playback device characterized by: