JPH0198151A - Storage device for final music number - Google Patents

Abstract

PURPOSE:To use storage information in all actions after storing a final music number by judging the installation of a user tape, executing high speed search in a forward direction or a reverse direction, extracting the final music number and storing it in a second storage part. CONSTITUTION:When a cassette is accurately installed, a switch 22 is turned on and a cassette installation detecting signal 24 is outputted. If a hole is closed when the cassette is installed, a switch 23 is turned on and an ID hole switching identification signal 25 is outputted. The signals are fetched into a micro computer 16. When the computer 16 judges that the installed tape is that of a user, it instructs the high speed search action in the forward direction, detects the final music number and stores it in the final music number save address of a memory. When the final music number cannot be stored in high speed search in the forward direction, high speed search in the reverse direction is executed and the final music number is stored. After the final music number is stored, storage information can be used in all the actions.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention particularly relates to a final track number storage device in a digital audio tape recorder (hereinafter abbreviated as DAT).

B0 Summary of the Invention A track number extracting means for extracting a track number from a playback signal, a tape end discriminating means for discriminating the end of a tape, a first storage section for sequentially storing the track numbers by the track number extracting means, and the tape. a second storage section that holds the track number stored in the first storage section as the end of the tape is determined by the end end determination section; and a cassette attachment detection section that detects attachment of a cassette;
10-hole opening/closing identification means for identifying opening/closing of the ID hole; and control for determining whether a user tape is inserted based on signals obtained from the cassette attachment detection means and the ID hole opening/closing identification means, and controlling detection/storage operation of the final track number. and means for storing the final song number by searching in the backward direction if the final song number cannot be stored by searching in the forward direction.

C6 Prior Art DAT is known as a magnetic reproduction device for audio signals.

There are two types of DAT: R-DAT, which uses a rotating head, and 5-DAT, which uses a fixed head. Hereinafter, R-
This will be explained using DAT as an example.

The recording tracks of the R-DAT are formed diagonally, similar to a VTR. The signal configuration of that track is as shown in Figure 2: subcode area 1, ATF
Area 2. PCM area 3, ATF area 2
', subcode area 1', and subcode area 1'. 4 and 5 are arrows indicating the head running direction and tape running direction, respectively.

The subcode data recorded in subcode areas 1 and 1' includes table of contents information called TOC, absolute time (
absolute time).

There is a 5tart-ID indicating the performance time (program time) of the song and the start of the song.

DAT uses this information to enable high-speed cueing and trick plays.

Also, unlike CDs, it has the feature of being recordable.
In addition to soft tapes, there are also user tapes created by users.

For soft tape, T
OC is recorded over the entire tape. Therefore, the total number of songs can be known by reproducing the TOC.

However, with user tapes, it is very difficult to record the TOC over the entire tape as with soft tapes, and usually up to 9 TOCs are recorded at the beginning of the tape, as shown in Figure 3(b). seconds (7) TOC (U-TOC
), or TOC is not recorded. Therefore, if the playback start point is in the middle of the tape, the total number of songs is unknown, and when selecting a channel in the forward direction from that state, it is an uncertain setting. Become. For example, even though the tape has N songs recorded, there may be a case where settings for more than N songs are made.

In order to eliminate the above-mentioned drawbacks, the present applicant has filed a patent application in
No. 899 (filed on May 20, 1988) proposed a device for storing the final track number. However, this method has the disadvantage that it is necessary to continue storing the final track number until the end of the tape can be detected, and in some cases it takes a considerable amount of time to store the final track number.

For example, when rewinding a tape or repeating a certain song during playback, the last song number will continue to be memorized during this operation, but the last song number cannot be detected by repeating this operation.

D0 Problems to be Solved by the Invention In order to eliminate the above-mentioned drawbacks, the purpose of the present invention is to perform a high-speed search in the forward direction after inserting the cassette to detect/detect the final track number.
To provide a final music number storage device capable of detecting/storing the final music number by performing a backward search if this is not possible.

Means for Solving the E0 Problem In order to achieve the above object, the final track number storage device according to the present invention includes means for detecting a tape pack device and detecting whether or not the installed pack is a user tape. means for determining, means for setting the tape to a forward high-speed search in accordance with the detection and discrimination by the above two means, a means for determining the end of the tape, and extracting a track number at the time of search by the means for setting the high-speed search. a first storage section that sequentially stores the song numbers extracted by the song number extracting means; a second storage section that can store the song numbers; means for causing the second storage unit to hold the latest song number stored in the first storage unit; and determining that the song number is held in the second storage unit upon determination of the end of the tape; means for setting the tape to a high-speed reverse search when the track number is not retained by the means for determining that the track number is retained in the second storage means; and means for performing a high-speed reverse search of the tape. The present invention includes means for extracting a song number at the time of search by the means for setting the song number, and means for causing the second storage section to hold the song number first extracted by the means for extracting the song number.

20 action When the cassette is inserted, the cassette insertion detection signal detects the insertion of the cassette and identifies the opening/closing of the ID hole.
Based on the ID hole opening/closing identification signal, it is determined whether a user tape is attached, and if it is a user tape, a high speed search is performed in the forward or reverse direction.

The final song number is extracted and the extracted song number is stored in the second storage section.

G. EXAMPLES The present invention will be explained in more detail below using examples with reference to the drawings, but these are merely illustrative and various modifications and improvements can be made without going beyond the scope of the present invention. Of course it is possible.

FIG. 1 is a block diagram showing the signal flow during reproduction in the final track number storage device according to the present invention. In the figure, 6 is a magnetic tape, 7 is a head, 8 is a reproduction amplifier, 9 is an equalizer, a PLL circuit, and an ATF. Detector, 10 is PCM-
RAM for DAT, 11 is a signal processing section, 12 is a D/A conversion section, 13 is an audio playback signal output, 14 is a drum,
Reel and capstan drive mechanism, 15 is a servo controller, 16 is a system microcomputer, 17 is a display section, 18 is an operation section, 19 is an end sensor, 20 is a RAM for the system microcomputer, 21 is a cassette state detection section represents.

A reproduction signal reproduced from the magnetic tape 6 is amplified by a reproduction amplifier 8 and waveform-shaped by an equalizer circuit 9. P
The clock component is extracted by the LL circuit 9. Digital data obtained in synchronization with this clock is input to the signal processing section 11, and after 10-8 conversion, it is separated into audio data and subcode data, and error correction is performed.

Thereafter, the audio data is converted into an analog signal by the D/A converter 12.

The system microcomputer 16 is the operation unit 18
It processes key human input signals from the signal processing section 11 and reads subcode data from the signal processing section 11 as necessary to control the display 17 or the drive mechanism 14.

The servo control unit 15 receives the ATF signal and performs tracking. In addition, the system microcomputer
Control signals are also input from 16 to control the drum, reel, and capstan motors.

The end sensor circuit 19 is a circuit that detects the starting and ending ends of the tape 6, and a detection signal is input to the system microcomputer 16.

The cassette state detection unit 21 detects the attachment of a cassette and the ID hole of the cassette. An example of this detection circuit is shown in FIG. In the figure, 22 is a cassette device detection switch, 23 is an ID hole opening/closing identification switch, and 24 is a cassette device detection switch.
25 represents the cassette attachment detection signal output, and 25 represents the ID hole opening/closing identification signal output. Cassette attachment detection switch 22
and ID hole opening/closing identification switch 23 is a bushing switch.

When the cassette is correctly installed, the switch 22 is turned on and a cassette installation detection signal 24 is output. Also, if the hole is closed when the cassette is installed, switch 23
is turned on, and the ID hole opening/closing identification signal 25 is output. These signals are the system microcomputer 1
Connected to input port 6.

Next, the operation of performing a high-speed search in the forward direction after inserting the cassette and detecting/storing the final track number will be explained.

This operation is performed by the system microcomputer 16
is realized by executing the flowcharts shown in FIGS. 5 to 7.

The contents of the memory described in the following explanation are Memory A:
Last track number save address memory B: An arbitrary track number save address.

The operation of the system microcomputer 16 will be explained based on the flowchart in FIG.

(l) RAM for system microcomputer
Clear 20. (2) Input the detection signal from the cassette attachment detection section 21 to check the cassette attachment status. If the cassette is installed, proceed to (3). If it is not attached, repeat operation (2).

(3) Input the cassette ID hole detection signal and judge whether it is a soft tape. If it is a soft tape, read the subcode, save the TOC in memory, and proceed to (7). If it is not a soft tape (that is, if it is a user tape), proceed to (4).

(4) Command a high-speed search operation in the forward direction.

(5) Detect the last number and save it to memory A.

The detailed operation of (5) will be explained in b).

(6) End the high-speed search operation.

(7) With the above steps, the final song number could be detected. This final song number is
Cleared by ejecting the cassette or turning off the power.

Explanation of operation for detecting/storing number b The operation for detecting/storing the final song number in a)-(5) will be explained using the flowchart of FIG.

(l) Enter the subcode.

(2) Extract the song number from this subcode information.

(3) Save the extracted song number to memory B.

(4) It is determined whether the tape is at the end based on the signal input from the end sensor circuit 19.

If it is not the end of the tape, return to (l) and repeat the above operation.

(5) Check whether memory B is cleared or not. If clear, proceed to (6). If not cleared, proceed to (7).

(6) Perform a high-speed search in the reverse direction to detect the song number.

The first detected song number is saved in memory B.

The detailed operation of (6) will be explained in C).

(7) Move the data in memory B to memory A.

So far, the determination of the final track number has been explained by detecting the end of the tape. However, the final song number is determined from the subcode data to the lead-out area (the song number is B).
This is also possible by detecting the area recorded as EE on the CD display.

In FIG. 3, the lead-out area is shown with diagonal lines.

The lead-out area is recorded for 9 seconds or more after the end of audio recording. therefore.

The final track number is determined at 9 o'clock by detecting either the end of the tape or the lead-out area.

A quick search is performed in the direction of 91JJ to detect the song number.The operation of performing a high speed search in the opposite direction of (6) to detect the song number will be explained using the flowchart of FIG.

(l) Execute a high-speed search operation command in the reverse direction.

(2) Enter the subcode. The presence or absence of 5-ID is checked from this subcode information. 5-If you have an ID (3
). 5-If there is no ID, wait until it can be detected (2
) Repeat the operation.

(3) Command a low-speed search in the forward direction.

(4) Enter the subcode. The presence or absence of 5-ID is checked from this subcode information. 5-If you have an ID (5
). 5-If there is no ID, until it can be detected (
Repeat step 4).

(5) Extract the song number from this subcode information.

(6) Save the extracted song number to memory B.

According to the present invention, the final track number can always be detected/stored no matter where the tape position is when the cassette is inserted. Furthermore, when the cassette is inserted into the set, the last song number is automatically stored, so that after the last song number is stored, this storage information can be used in any operation.

Furthermore, the present invention can be realized by software, and has the advantage that the number of parts does not increase.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the flow of signals during playback in the final track number storage device according to the present invention, FIG. 2 is a diagram showing the configuration of recording tracks, and FIG. 3 is a diagram showing the recording range of the tape.
FIG. 4 is a circuit diagram of the cassette state detection section, FIG. 5 is a flowchart for performing a high-speed search in the forward direction and storing the final song number, and FIG. 6 is a flowchart for storing the final song number.
FIG. 7 is a flowchart for performing a search in the reverse direction and extracting a song number. 6...Magnetic tape, 7...
・Head, 8... Regenerative amplifier, 9...
・・・・・・Equalizer, PLL circuit, ATF detector, 10・・・・・・RAM for PCM-DAT, 1
1... Signal processing section, 12...
...D/A converter, 13...Audio playback signal output, 14...Drum, reel and capstan drive mechanism, 15...・
・Servo controller, 16... System microcomputer, 17... Display section,
18......Operation section, 19......
・Terminal sensor, 20... RAM for system microcomputer, 21... Cassette status detection section, 22... Cassette device detection switch , 23......ID hole opening/closing identification switch, 24......Cassette attachment detection signal output, 25...ID hole opening/closing identification signal output. Patent applicant Clarion Co., Ltd.

Claims (1)

[Claims] (a) means for detecting a tape pack device; (b) means for determining whether or not the attached pack is a user tape; (c) means for detecting and determining the above two means. (d) means for determining the end of the tape; (e) means for extracting a track number when searching by the means for setting the high-speed search; (f) extracting the track number. (g) a second storage section capable of storing track numbers; (h) a first storage section that sequentially stores track numbers extracted by the means for determining the end of the tape;
means for causing the second storage unit to hold the latest track number stored in the storage unit; (i) determining that the track number is held in the second storage unit upon determining the end of the tape; means, (j) means for setting the tape to a high speed search in the reverse direction when the track number is not held by the means for determining that the track number is held in the second storage means; (k) means for reversing the tape; means for extracting a song number during a search by the means for setting a high speed search in the direction; and (l) means for causing the second storage unit to hold the song number first extracted by the means for extracting the song number. A final track number storage device characterized by: