JP2545360Y2 - R-DAT subcode playback device - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an R-DAT sub-code reproducing apparatus, in particular, discriminates whether a sub-code read from a tape is correct or not, and outputs only a correct sub-code to display and display. The present invention relates to an R-DAT subcode reproducing device capable of preventing a malfunction such as a search.

[Conventional technology]

In R-DAT, a subcode-ID (S-ID, PNO, etc.) is provided at the lower end (sub 1 area) and the upper end (sub 2 area) of the tape.
And the absolute time indicating the position from the tape start point (A-time)
And the elapsed playing time (P-time) indicating the position from the start of the song
Is recorded for each track, and this subcode is reproduced and can be used for displaying S-ID, music number, time, etc., and for search processing.

[Problems to be solved by the invention]

By the way, conventionally, the subcode reproduced from the tape was used without judging correctness, but there are cases where the subcode is incorrect due to scratches or dust on the tape, which may cause erroneous display or search error. there were.

In particular, the error rate increases during fast-forward / fast-reverse playback of FF, REW, CUE, and the like. For example, in the case of time display, the unit of hours and minutes changes irregularly, causing a flickering phenomenon that makes it difficult to see.

The present invention has been made in view of the drawbacks of the related art, and has as its object to provide an R-DAT sub-code reproducing device that outputs only a correct A-time at the time of fast forward playback and fast reverse playback.

In other R-DAT subcode reproducing devices according to the present invention, the correct A-time
The purpose is to output only.

In another R-DAT subcode reproducing apparatus according to the present invention, even if the A-time of the tape is discontinuous at a plurality of positions, it is surely correct at the time of fast-forward or fast-reverse playback at medium or high speed.
The purpose is to be able to output A-time.

[Means for solving the problem]

In the R-DAT sub-code reproducing apparatus according to the present invention, a sub-code reading unit for reading an A-time from a tape, a storage unit for storing an effective A-time, and a sub-code reading unit for fast forward (fast rewind) reproduction From the effective A-time stored in the storage unit, the A-time read in
A determination unit that determines whether or not the window is within a window range up to a time obtained by adding (subtracting) to the effective A-time, and outputting as a correct A-time when entering; And a rewriting unit for rewriting the effective A-time in the storage unit with the A-time at the time of output.

Further, in another R-DAT sub-code reproducing device according to the present invention, the discriminating unit includes the A-ti read by the sub-code reading unit.
When it is determined that me does not fall within the window range for a predetermined number of consecutive times, the A-time determined last is output as a correct A-time.

〔Example〕

One embodiment of the present invention will be described with reference to FIG.

In this embodiment, at the time of FF and at the time of REW, the presence or absence of an error in the A-time read from the tape is determined, and the erroneous A-time is ignored to eliminate the erroneous display.

 FIG. 1 is a block diagram of the R-DAT according to the present invention.

On the tape 10, the same subcode is recorded in the sub 1 area on the lower end and the sub 2 area on the upper end, in addition to the PCM audio signal recorded in the center.

The subcode is a subcode-ID such as S-ID, PNO, and A-ti
It consists of PACK data such as me and P-time.

The signals recorded on each track of the tape 10 are alternately read by the A head 12 and the B head 14 of the rotating drum.

The output sides of the A head 12 and the B head 14 are connected to a reproduction amplifier 18 via a changeover switch 16 to amplify an RF signal which is a head detection output.

A waveform equalization circuit 19 is connected to the output side of the reproduction amplifier 18, where the RF signal is equalized in waveform.

A signal processing circuit 20 is connected to the output side of the waveform equalization circuit 19, and reads audio sample data and subcode from the RF signal after waveform equalization.

The microcomputer 22A is connected to the subcode output side of the signal processing circuit 20.

An operation unit 24, a display unit 26, a motor servo system, and the like are also connected to the microcomputer 22A.

The operation unit 24 is provided with a PLAY key, an FF key, a REW key, a CUE key and the like, and outputs a key signal corresponding to a user's key operation to the microcomputer 22A.

The display unit 26A includes a multi-digit time display, and displays A-time according to a display control signal from the microcomputer 22A.

The microcomputer 22A has a CPU, a ROM, and a RAM connected to a bus. Based on a predetermined program stored in the ROM, the microcomputer 22A performs high-speed fast-forward reproduction (FF) and high-speed fast In addition to operation control such as reverse playback (REW), medium-speed fast forward / fast reverse playback (CUE), and normal playback (PLAY), processing such as A-time discrimination, display control, and the like are performed.

The RAM has a storage area of a label E for storing the A-time read by the signal processing circuit 20, a storage area of a label F for storing the effective A-time, and a predetermined time for the effective A-time. A storage area of the label G for storing the added or subtracted window time, and the number of consecutive error determinations I
Storage areas are provided.

The rotating drum is provided with a rotation detector (not shown), and a scanning start timing is detected for each scanning by the A and B heads 12 and 14 and output as a scanning pulse to the changeover switch 16 and the microcomputer 22A. You.

The changeover switch 16 is switched to the A head 12 when the A head 12 starts scanning according to the scanning pulse, and is switched to the B head 14 when the B head 14 starts scanning.

Next, the operation of the above embodiment will be described with reference to the flowchart of FIG.

FIG. 2 shows a process for determining whether or not the A-time is correct or incorrect at the time of FF and REW, and displaying the A-time.

When the user instructs fast-forward playback by operating the FF key, the microcomputer 22A first controls the R-DAT units to
Perform the operation.

At this time, reading of the subcode is started in the signal processing circuit 20.

In this state, the microcomputer 22A starts the subcode processing.

Note that F has to be A- at the tape position at the time of key operation.
It is assumed that the time is stored as the effective A-time, and the A-time is displayed on the display unit 26A based on the F.

First, I is cleared (step 58), and after confirming that the operation is FF (step 60), the time obtained by adding t to the effective A-time of F is written in G (step 62).

Here, the t minutes are on the tape 10 when the FF is scanned 10 times.
This is a value longer than the elapsed time of A-time, and here is set to 5 minutes as an example.

Then, it waits for a scanning pulse to be input from the rotation detector (step 64). When the scanning pulse is input, the first A-time for the sub 2 is input from the signal processing circuit 20 and stored as E (step 66).

Next, the A-time of E is the effective A-time of F and the window of G
It is determined whether the time falls within the range of time (step 68).

Here, when the reading of the A-time from the tape 10 is correctly performed, the scanning interval during the FF playback is set to the A-ti on the tape 10.
Because it is shorter than 5 minutes in me
22A determines YES in step 68 and clears I (step 69). At this time, the A-time of E is the effective A-time of F.
Is rewritten (step 70), and the rewritten F
A display control signal is output to the display unit 26A based on the A, and the A-time display is updated (step 72).

Subsequently, the process returns to step 60, and after confirming that the FF operation is being performed, G is added to the new effective A-time for 5 minutes (step 62).

At the next scan start timing, the second A-time is input from the signal processing circuit 20 and stored as E (step 6).
4, 66).

Next, it is determined whether or not the A-time of E read this time falls within the window range from F to G. When the A-time is correctly read and the answer is YES, the microcomputer 22A rewrites F Change the A-time display (Step 68-
72).

Similarly, while the A-time is accurately read from the tape 10, the read A-time falls within the window ranges of F and G, so that rewriting of F and updating of the A-time display are repeated. Go.

Then, in a certain scan, the A-time
When an error occurs in the reading of A and the A-time exceeding G is output from the signal processing circuit 20, the microcomputer 22A determines NO in the determination at step 68.

At this time, the microcomputer 22A does not rewrite F, but increments I (step 74).
Since the window range has not been exceeded ten times consecutively (NO in step 76), the flow advances to step 72 to perform display control based on the original F.

 Therefore, the A-time display is held at the previous value.

Then, the process returns to the step 60, but G does not change in the process of the step 62.

Thereafter, when the A-time for the next scan is read by the signal processing circuit 20, the microcomputer 22A
Is in the window range indicated by F and G (steps 64 to 68).

If there is still a reading error and the window is beyond the window range, the F is not rewritten and the A-time display is not updated.
(No at step 68, 7
4, 76, NO judgment, 72).

Then, returning to step 60, when the A-time for the next scan is read without changing G, it is determined again whether or not the window falls within the window range indicated by F and G (steps 62 to 6).
8).

This time, when the reading error has been resolved, the microcomputer 22A proceeds to step 68 because the read A-time is still within 5 minutes of F (same as the displayed A-time) in several scans. Is determined to be YES, I is cleared for the first time, F is rewritten with the A-time read this time, and the A-time display is updated (steps 69 and 70,
72).

While the reading of the A-time from the tape 10 continues, the F is rewritten and the display is updated with the read A-time.

Thereafter, if a reading error occurs again and the read A-time exceeds the range between F and G,
The rewriting of F and the updating of the A-time display are stopped, and after returning to normal, the rewriting of F and the updating of the display are restarted.

As a result, a scratch or the like on the tape 10 at the time of the FF causes a failure as shown in FIG.
Of K (graph of A-time of signal processing circuit output with respect to elapsed time of FF), even if a reading error beyond the window range occurs as shown by points a and b, a and b are ignored in F and A-time display. It shows a continuous change like L (a graph of the value of F with respect to the elapsed time of FF) in FIG. 3 (2).
The flicker of the display due to the irregular change of the minute digits is suppressed.

By the way, in FIG. 4, M (A-ti
If the A-time recorded on the tape 10 becomes discontinuous due to rewriting by the user as shown in the graph of me), it returns to zero from point c in the middle, and then rises again, it will reach the discontinuity point The microcomputer 22A determines NO in step 68, but the F remains at the value of the point c, so the microcomputer 22A determines NO in step 68 even after the re-starting portion of the A-time. And A-time
Continue to hold the previous value on the display.

In this case, when NO is determined in step 68 consecutively 10 times, the microcomputer 22A determines that the correct A-time has been read, and clears I and rewrites F with the last read A-time. The display is updated (YES in step 76, 69 to 72).

As a result, the A-time of the re-starting portion is accurately displayed thereafter.

Conversely, when the user operates the REW key to instruct fast rewind playback, the microcomputer 22
After A controls each part of the R-DAT to perform the REW operation, and subsequently starts the subcode processing, it is necessary to confirm that the operation is REW (step 80). Except for writing the time obtained by subtracting 5 minutes into G (step 82),
The same processing as in the above-mentioned FF is performed.

However, at the time of REW, the tape 10 runs in a direction opposite to that at the time of FF.

As a result, even during REW, A-time
The flicker of the -time display can be prevented, and the A-time written by the user discontinuously can be reliably displayed.

In the embodiment shown in FIG. 1, the time for adding or subtracting from F is set to 5 minutes. However, the time may be other than 5 minutes, and the determination criterion in step 76 may be set to a value other than 10 times. Good.

In addition, at the time of CUE, the A-time can be accurately reproduced and displayed by the same processing as described above.

[Effect of the invention]

In the R-DAT sub-code reproducing apparatus according to the present invention, a sub-code reading unit that reads A-time from a tape, and an effective A-time
The storage unit that stores time, and during fast forward (fast rewind) playback,
It is determined whether the A-time read by the subcode reading unit falls within the window range from the effective A-time stored in the storage unit to a time obtained by adding (subtracting) the effective A-time for a predetermined time. And a discriminator that outputs as a correct A-time when entering, and an A-ti when the discriminator outputs as a correct A-time
By providing a rewriting unit that rewrites the effective A-time in the storage unit with me, it is possible to determine whether there is an A-time reading error due to a scratch on the tape and output only the correct A-time. It can be used to reduce erroneous display due to A-time.

In another R-DAT sub-code reproducing device according to the present invention, the discriminating unit is the A-time read by the sub-code reading unit.
If it is determined that the A-time does not fall within the window range for a predetermined number of consecutive times, the A-time determined last is output as a correct A-time so that even if a discontinuous A-time is recorded on the tape. There is an excellent effect that A-time output can be reliably performed.

[Brief description of the drawings]

FIG. 1 is a block diagram of an R-DAT according to one embodiment of the present invention, FIG. 2 is a flowchart showing the operation of the microcomputer in FIG. 1, and FIGS. -DA
FIG. 9 is a diagram illustrating the operation of T. 10: tape, 12: A head, 14: B head, 20: signal processing circuit, 22A: microcomputer, 26A: display unit.

Claims (2)

(57) [Scope of request for utility model registration] 1. A sub-code reading unit for reading an A-time from a tape, a storage unit for storing an effective A-time, and an A-time read by the sub-code reading unit during fast forward (fast reverse) playback. From the effective A-time stored in the section, it is determined whether or not the window is within a window range up to a time obtained by adding (subtracting) the effective A-time for a predetermined time, and when entering, outputting as a correct A-time An R-DAT sub-code reproducing apparatus, comprising: a rewriting unit for rewriting an effective A-time in a storage unit with an A-time when the discrimination unit outputs a correct A-time. 2. A method according to claim 1, wherein the determining unit determines that the A-time read by the subcode reading unit does not fall within the window range continuously for a predetermined number of times.
The R-output according to claim 1, wherein the output is performed as time.
DAT subcode playback device.