JPH0877752A - Playback time management device - Google Patents

Abstract

(57) [Abstract] [Purpose] The playback time of a song when a coded signal containing audio data is decoded is displayed by counting the sound frames, which is the unit of coding processed by the coded signal decoding unit. This reduces the load on the system control microcomputer. [Configuration] The processing performed by the system control microcomputer 7 can be performed in the coded signal decoding unit 4 without changing the number of loops or the processing amount even if one music piece is divided into many links. Even if the number of links of one song increases, the system control microcomputer 7 does not overflow and the system can operate normally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproduction time management apparatus for decoding a coded signal, for example, input data obtained by digitizing a continuous signal is bit-compressed and recorded on a disk-shaped recording medium. The present invention relates to a reproduction time management device applied to a disk recording / reproducing device that reproduces data by reproducing the bit-compressed data from a medium and decompressing the bit.

[0002]

2. Description of the Related Art Conventionally, compact discs (CDs) and the like are used to manage the song number and reproduction time of audio data.
As illustrated in FIG. 5A, audio data 30 is recorded on the disc.
Separately from this, data called sub-code Q31 in which the attributes of audio data (stereo / monaural, etc.), song number, reproduction time, etc. are written is recorded. The subcode Q31 is recorded intermittently in the audio data 30, and is read out at the same time as the reproduction of the audio data. The song number and the reproduction time of the song being reproduced can be easily known by reading the subcode Q31. You can FIG. 5 (b) shows a subcode Q31 including the above contents.
32 indicates the structure of the audio data of the corresponding part, and 33
Is a reproduction time from the beginning of the music of the corresponding portion, and 34 is a recording attribute such as stereo / monaural of the music of the corresponding portion.

As described above, in the case of a CD or the like, the subcode Q
I was able to know the playback time by reading 31, but
When one piece of music is discontinuously recorded on a disk-shaped recording medium such as a hard disk or a mini disk (MD), the time cannot be directly known like the subcode Q in the case of a CD. In the case of a recordable MD, the physical position (address) on the disc for each song number is written in the management table (hereinafter referred to as UTOC) that associates the encoded audio data and the sector address illustrated in FIG. Has been.

Here, FIG. 6 (a) shows the structure of the UTOC, and 17a to 17f are links each of which is numbered from 1 to 255 when one block divided and recorded on the disc is called a link. Represents the start and end addresses of the.
21a to 21c represent the music number of the link (i) (i is an integer of 1 to 255), or from which link in the case of a link in the middle of the music, 22a to 22c are links ( If i) is the end of the song or is in the middle of the song, it represents the number of the link to continue.

FIG. 6 (b) is a detailed diagram of the start and end addresses of the link (i). 18 is a cluster number, 19 is a sector number, and 20 is a coded signal (sound frame) number of the sector. Therefore, by examining the UTOC, even if one song is divided into a plurality of pieces on the disc, the position on the disc can be obtained and reproduced.

FIG. 7 shows a concrete example of the UTOC in the case where one music piece is divided into three and recorded on the disc, and FIG. 8 shows a physical layout diagram on the disc at that time.

First, the physical arrangement on the disk shown in FIG. 8 will be described. FIG. 8 shows that the song number # 1 is divided into three and recorded on the disc, and 25 is the song number # 1.
In the first recorded part of the link 1, the start address (25
It represents a link with a length of 6 sectors from a) to the end address (25b). Reference numeral 26 is a link 2 which is the second recording portion of the music number # 1, and represents a link having a length of 2 sectors from the start address (26a) to the end address (26b). 27 is a link 3 which is the third recording part of the song number # 1, and has 20 clusters (1 cluster = 32 sectors) from the start address (27a) to the end address (27b), that is, 640 sectors. Represents a length link.

Next, the UT when arranged as described above
A specific example of OC will be described. In FIG. 7, 23a indicates that link 1 is the head of song number # 1, 23d indicates that link 1 continues to link 2, 23b indicates that link 2 is a continuation of link 1, and 23e Indicates that link 2 continues to link 3, 23c indicates that link 3 is a continuation from link 2, and 23f indicates that link 3 is the final link of song number # 1.

Now, a method of calculating the reproduction time in the case of MD will be described with reference to FIG. When the disc shown in FIG. 8 is played back, the playback is performed as shown in (Equation 1) depending on how many sectors are played back from the beginning of the song at the start address 25a of the link 1, that is, t = 0. The time t can be calculated.

[0010]

[Equation 1] Play time t = n sector × 1 sector play time (6
3.9 ms) The reproduction time of t = A (28a) in FIG. 8 is t when calculated from FIG.
Since the number of sectors from = 0 (25a) to t = A (28b) is 638, it can be calculated from (Equation 1) as (638 sectors × 63.9 ms = 40 seconds).

FIG. 9 is a flow chart showing a method of converting the reproduction time in the conventional MD. This will be described below, but since this series of processing is all performed in the system control microcomputer 7 of the reproduction time management device shown in FIG. 2, it will be described using FIG. 2 as well.

In FIG. 2, reference numeral 1 denotes an input terminal from a signal detection unit (not shown), to which a signal containing audio data divided continuously or discontinuously is input. 2 is the input terminal 1
An input signal processing unit for encoding a signal including audio data from the audio output unit 3 and outputting an encoded audio signal, 3 is a buffer memory control unit for controlling the buffer memory 8, 4 is the audio data ( Audio signal) output terminal 5
To the encoded signal decoding unit, 6 is an encoded signal decoding device including the input signal processing unit 2, the buffer memory control unit 3 and the encoded signal decoding unit 4, and 7 is the encoded signal decoding device. 6 is a system control microcomputer that controls each of the units 2, 3, and 4.

First, the system control microcomputer 7 reads the address currently being reproduced from the encoded signal decoding unit 4 of FIG. 2 (S1). Next, the UTOC which is the management information area of the disc
(FIG. 7) is read, and it is checked which link on the disk the address read in the process (S1) belongs to (S2). Next, a value obtained by subtracting the head address of the current link from the address currently being reproduced is substituted for the number of reproducing sectors (S3). Next, it is checked whether the link to which the address currently being reproduced belongs is the first link of the music (S4). If it's not the first link,
Proceed to processing (S5), check the UTOC, and read the previous link information. Next, it is checked whether this link is the first link (S6). If it is not the first link, the process proceeds to step (S7) to calculate [the number of reproduced sectors ← the number of reproduced sectors + the number of sectors of this link], and the process proceeds to step (S5) again. here,
Process until the first link is found on the UTOC (S
The loop from 5) to processing (S7) is repeated. In the case of MD, one song can be divided and recorded in up to 255 links, so the loop is repeated up to 255 times. If the first link is found in the process (S4) or if the first link is found in the process (S6), the process proceeds to process (S8), and the number of playback sectors traced by the UTOC search is converted into the playback time. To do.

As described above, the above-mentioned conventional reproduction time management device can obtain and manage the reproduction time of the audio data divided and recorded on the disc.

[0015]

However, in the above-mentioned conventional reproduction time management apparatus, one music piece is divided into a number of links because the system control microcomputer 7 of FIG. 2 performs a reproduction time conversion process. Processing (S5)
There is a problem in that the number of times the loop for searching the beginning of the music in the process (S7) is increased, the processing amount of the system control microcomputer overflows, and system abnormalities such as sound interruption occur.

The present invention is intended to solve such a conventional problem, and the encoded signal decoding unit 4 of FIG. 2 performs the processing performed by the conventional system control microcomputer 7 in the flowchart of FIG. Even if one song is divided into a number of links as shown in Fig. 1, it can be performed with a flowchart in which the number of loops and processing amount do not change so that the system control microcomputer does not overflow even if the number of links of one song increases. Another object of the present invention is to provide a reproduction time management device that allows the system to operate normally.

[0017]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a coded signal decoding unit with counter means for counting the number of decodings of a coded signal which is a processing unit of voice processing, and the beginning of a song. Which has a multiplying means for counting the number of processed coded signals from, and multiplying the number of processed coded signals by the reproduction time coefficient of one coded signal so that the reproduction time of the music being reproduced at present can be known. Is. In addition, a setting unit for the number of coded signals that has been fast forwarded or rewinded is provided so that the playback time of the currently playing song can be known even when performing fast forward or fast rewind. A setting unit is provided to automatically set the song number for each block that is the unit output from the input signal processing unit, and the song number is automatically added to the data for each block. is there.

[0018]

Therefore, according to the present invention, the coded signal decoding section counts the number of decodings of the processed coded signal in the currently reproduced music piece and multiplies the count value by the reproduction time coefficient of one coded signal. As a result, the reproduction time within the current song can be obtained, and since the reproduction time conventionally calculated by the system control microcomputer can be known, the calculation load of the system control microcomputer can be reduced.

Further, according to the present invention, even when fast-forwarding or fast-reversing an audio coded signal, the reproduction time is known by setting the number of coded signals that have been fast-forwarded or fast-returned from the system control microcomputer. Therefore, the calculation load of the system control microcomputer can be reduced.

Further, according to the present invention, by automatically adding the music number and the music number identification signal to the data block input to the buffer memory control unit, the code number is identified by the encoded signal decoding unit. Since it is possible to know the song number currently being reproduced, the load for managing the song number of the system control microcomputer can be reduced.

[0021]

1 is a flow chart showing a decoding process (reproduction process) performed by an encoded signal decoding unit 4 in the reproduction time management device of FIG. 2 in an embodiment of the present invention. In FIG. 1, when the reproduction process is started, the data sent from the buffer memory control unit 3 is examined, and the sound group to which the data belongs (SG: compression processing unit in the case of MD)
It is checked whether is the beginning of the song (S9). In the case of the head, the number of processing SGs is set to 0 (S10). If it is not the head, it is checked whether or not the data sent has a CUE / REV mark indicating that it is fast-forward / fast-reverse data (S11).
If there is a CUE / REV mark, the number of sound groups (SG) jumped without being reproduced for fast-forward / fast-reverse is added to the number of processed SGs (S12). If there is no CUE / REV mark, 1SG data is received from the buffer memory control unit 3 and expanded, and audio data is output to the output terminal 5 (S13). Next, the number of processing SGs is incremented by 1 (S14). Next, the reproduction time is obtained by multiplying the number of processed SGs by the time of 1 SG (S15). Next, it is checked whether or not the reproduction process is completed (S16), and if not completed, the process proceeds to the process (S9), and during the reproduction process, the process (S9) to the process (S16) is looped. Here, the structure of the reproduction time management apparatus in the embodiment of the present invention is the same as the conventional structure shown in FIG.
The processing performed inside the encoded signal decoding unit 4 in FIG. 2 and the processing performed inside the system control microcomputer 7 are different from those of the conventional reproduction time management device.

First, the difference from the conventional processing in the encoded signal decoding unit 4 is that the processing (S9) to (S12), (S1) in FIG.
4) and (S15) are increased in 6 processes.
Since more than hundreds of thousands of cycles are performed to perform 1SG decompression processing, even if the processing of several hundred cycles increases due to the increase of the above six processing, it is only about 0.1% from the whole. Since it does not increase, the coded signal decoding unit 4
Has almost no effect on the hardware scale or operating frequency.

Next, as the internal processing of the system control microcomputer 7 in the present embodiment, conventionally, the reproduction time is obtained by performing the processing shown in the flowchart of FIG. 9, but in the present embodiment, the encoded signal is used. It is only necessary to read the time calculated by the decoding unit 4. However, since it is necessary to inform the coded signal decoding unit 4 of the number of sectors that have not been reproduced due to the discontinuity (15 in FIG. 3) when the first sector of the song or fast forward / fast reverse is performed, 3 and 4
Will be explained.

FIG. 3 shows a state in which a block (sector) output from the input signal processing unit 2 of FIG. 2 is input to the buffer memory control unit 3. In FIG. 3, 9 to 11 are head addresses of sectors output from the input signal processing unit 2, and 12
To 14 are sectors output from the input signal processing unit 2, 15 are discontinuous portions of the encoded signal output from the buffer memory 8, and 16 are encoded signals of the sectors output from the input signal processing unit 2 (sound frame). ).

FIG. 4 is a flowchart of the processing performed by the system control microcomputer 7 of FIG. 2 on the input signal processing section 2.

Now, when transferring data from the input signal processing unit 2 of FIG. 2 to the buffer memory control unit 3, the system control microcomputer 7 checks whether the next sector to be transferred is the beginning of a song (S17). ). If it is the beginning of the song, the beginning mark of the data to be transferred is added (S21). Next, if the transfer sector is not at the head, it is checked whether it is a discontinuous sector due to fast-forward or fast-reverse (S18). If it is a discontinuous sector, the sector skipped without playing. CUE of data to be transferred from the input signal processing unit 2 to the buffer memory control unit 3 by setting the number in the encoded signal decoding unit 4 (S19)
Attach the / REV mark (S20).

[0027]

As described above, the reproduction time management device of the present invention has the following effects.

(1) The system control microcomputer can know the reproduction time of the music currently being reproduced only by reading the register of the reproduction time management device.

(2) Even if the decoding process (reproduction process) of the encoded signal is performed by fast forward or fast rewind, it is possible to know the reproduction time of the music currently being reproduced by simply reading the register of the reproduction time management device. it can.

(3) The system control microcomputer can know the number of the music piece currently being reproduced by simply reading the register of the reproduction time management device.

[Brief description of drawings]

FIG. 1 is a flowchart of processing of playback time management performed by a coded signal decoding unit of a playback time management apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of the present invention and a conventional reproduction time management device.

FIG. 3 is a diagram showing a state in which a block (sector) output from an input signal processing unit in one embodiment of the present invention is input to a buffer memory control unit.

FIG. 4 is a flowchart showing a process performed by the system control microcomputer according to the embodiment of the present invention with respect to the input signal processing unit.

FIG. 5 is a diagram showing a structure of audio data and a subcode of a compact disc (CD).

FIG. 6 is a diagram showing a management table (UTOC) that associates encoded audio data with sector addresses.

FIG. 7 is a diagram showing a specific example of a management table (UTOC) in the case where one music piece is divided into three and recorded on a disc.

8 is a diagram showing a physical layout on the disc shown by the UTOC of FIG. 7. FIG.

FIG. 9 is a flowchart showing a method of converting a reproduction time in a conventional mini disc (MD).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Input terminal of a coded signal decoding device, 2 ... Input signal processing part, 3 ... Buffer memory control part, 4 ... Coded signal decoding part, 5 ... Audio data output terminal, 6
... coded signal decoding device, 7 ... system control microcomputer, 8 ... buffer memory.

Claims (4)

[Claims] 1. An input signal processing section for inputting a signal containing continuous or discontinuously divided audio data from a disk, tape, communication medium or the like, and outputting an encoded audio signal, and the audio code. In a reproduction time management device having a coded signal decoding unit that decodes a coded signal and outputs audio data, the coded signal decoding unit counts the number of decodings of the coded signal that is a processing unit of audio compression. And a multiplication means for counting the number of processed coded signals from the beginning of the music and multiplying the number of processed coded signals by the reproduction time coefficient of one coded signal to obtain the reproduction time of the corresponding music. A reproduction time management device characterized by the above. 2. A coded signal of voice input to the coded signal decoding unit, header information for identifying the position of the coded signal, music of the input voice data, and the header information. And the management table information for establishing correspondence between the above, and referring to the management table information, the header information of the coded signal of the currently reproduced music number is detected and the coded signal of the voice that is discontinuously input. The reproduction time management device according to claim 1, wherein the reproduction time management device can reproduce the continuous audio data. 3. A coded signal number setting unit for fast-forwarding or fast-returning encoded voice, wherein fast-forwarding or fast-returning of the encoded voice is based on the management table information and header information. However, by detecting the number of coded signals that have not been replayed in order to perform fast-forward or fast-reverse from the setting unit, fast-forward or fast-reverse is performed. The reproduction time management device according to claim 1 or 2, wherein the reproduction time of the corresponding song can be obtained even during reproduction. 4. A system having a setting unit for automatically setting a music number for each block output from the input signal processing unit and transferring the encoded signal from the input signal processing unit to the buffer memory control unit. The control microcomputer automatically adds the music number preset in the setting section based on the management table information and the header information together with the music number identification information and transfers it, and decodes the encoded signal from the buffer memory control section. 3. The reproduction time management device according to claim 1, wherein when the coded signal is transferred to the unit, the music number of the block to be reproduced can be detected by the music number identification information.