JP4977777B2 - Encoding apparatus, encoding method, and encoding program - Google Patents

Description

  The present application belongs to the technical field of an encoding apparatus, an encoding method, and an encoding program. More specifically, for example, information recorded on an information recording medium such as an audio CD (Compact Disc) is stored in the information recording medium. The present invention belongs to the technical field of an encoding apparatus and an encoding method for performing an encoding process necessary for copying from an information recording medium to another type of information recording medium, and an encoding program used in the encoding apparatus.

  First, the background art of the present application will be described with reference to FIG.

  In recent years, for example, in the field of car navigation devices and the like, audio information recorded on the audio CD (hereinafter, the audio CD is simply referred to as “CDDA (CD Digital Audio)”) is extracted from the CDDA. For example, it can be copied to another information recording medium such as an HDD (Hard Disc Drive) provided separately in the navigation device or the like.

  At this time, in the copying, firstly, a process of extracting audio information desired to be copied from the CDDA is executed. This extraction process is hereinafter referred to as “rip process”. Then, the audio information after the ripping process is re-encoded into another compression format, and then recorded on the other information recording medium. As the compression format for re-encoding, for example, so-called mp3 (MPEG (Moving Picture Expert Group) -1 Layer-3 Audio) standard, AAC (Advanced Audio Coding) standard, and the like are common.

  Here, in the CDDA, each of the tracks corresponding to the audio information is configured as a set of so-called PCM (Pulse Code Modulation) samples. When the audio information (track) after the ripping process is re-encoded in the compression format and converted into a compressed audio file, the audio information (track) is conventionally included from the beginning to the end of the track to be re-encoded. Each PCM sample is sequentially input to the encoding unit in units of so-called encoded samples (hereinafter simply referred to as ES) which are data units used for the re-encoding process, and compressed audio data as a result of the re-encoding process The file is converted into a compressed audio file as it is.

  As is well known, in the CDDA, address information on the head of the CDDA is described in the track by so-called TOC (Table Of Contents) information. Further, as is well known, the TOC information is described in units of “frames” which are data units used when recording tracks in CDDA.

In the following description, the compressed audio file is simply referred to as “ENC file”, and the re-encoding process is simply referred to as “ENC process”. Further, the number of PCM samples constituting one frame is different from the number of PCM samples constituting one ES, and usually both are in a non-integer multiple relationship. More specifically, the former PCM sample number is generally 2352 (bytes) / 4 (bytes) = 588 samples, and the latter PCM sample number is, for example, when the AAC standard is used as the other compression method.
4096 (bytes) / 4 (bytes) = 1024 samples. Note that the number of PCM samples constituting the ES 200 is different in correspondence with the other compression methods described above. More specifically, for example, when the mp3 standard is used as the other compression method, 1152 samples or There are 571 samples.

  On the other hand, in many compression formats related to re-encoding / decoding processing such as the mp3 standard, a time delay depending on an internal processing algorithm of an encoding unit or a decoding unit itself that performs the processing generally occurs. In the following description, a delay time corresponding to the time delay is treated with the ES as a unit.

In the re-encoding process, if the re-encoding process is simply performed sequentially from the beginning to the end of the PCM sample for one track as described above, the following two problems are caused by the delay time. appear.
(I) Unnecessary silence samples are inserted for a predetermined time at the beginning of the encoded data.
(II) Sound (PCM sample) is missing for a certain time at the end of the encoded data.

  This problem will be described more specifically with reference to FIG. In FIG. 1, the delay time is set to 1.5 times the time required for the ENC process for one ES. In FIG. 1, ES 200 and encoded data 300 within one rectangular broken line are ES 200 and encoded data 300 related to the same audio information, respectively.

As illustrated in FIG. 1, the ENC processing is performed in this order for each of the ES200 _{0 to} 200 _n constituting the pre-encoding file R _n obtained by changing the arrangement of each frame for the ENC processing. respectively subjected, encoded data _{300 0, 300 1, ...,} 300 n-2, ..., consider a case of generating the ENC file _{E n} corresponding to the configuration and the original unencoded file _{R n} by. In this case, in the generated ENC file E _n, due to the time delay in the encoding unit that performs the ENC process, silence samples x at the head can be inserted automatically or (above problems (I) Or, all or part of the encoded data 300 corresponding to the tail end is missing (the above problem (II)).

  At this time, the insertion of the silent sample x compensates for the lack of ES200 on the reproduction time axis due to the time delay (in the example shown in FIG. 1, 1.5 ES200 from the start timing Tstart of ENC processing). Therefore, the silence sample x corresponding to the missing portion is automatically inserted in the encoding unit.

Further, the lack of the encoded data 300 is caused by the stop and the delay time because the supply of the ES 200 to the encoding unit stops after the end of the pre-encoding file R _n (see “Tend” in FIG. 1). This is because, after the stop timing, the encoded data 300 after the ENC process is not output from the encoding unit (see x in FIG. 1).

  In particular, when each of the above problems is applied when a plurality of tracks or frames in which audio as audio information is continuous is arbitrarily divided and each of the divided tracks is subjected to ENC processing at, for example, random time and order, Each problem is embodied as an unexpected automatic insertion of a silent sample x at the beginning of each division unit and an unexpected missing PCM sample at the end. In this case, in the continuous reproduction process using the ENC file E after the ENC process corresponding to each of a plurality of tracks, the sound that should originally be continuous becomes discontinuous.

  On the other hand, among the above-mentioned CDDA, there is a CD in which voice or performance sound or the like continues across a plurality of tracks recorded thereon. Such a CD is hereinafter referred to as a “gapless CD”. As an example of the gapless CD, for example, when the sound of a concert in which a plurality of songs are sung is recorded on one CD, or so-called BGM. For example, a CD for reproducing environmental music without a break is used. In these gapless CDs, there is no so-called “song (gap)” as the audio information to be played back. However, on the TOC information, as a collection of a plurality of tracks depending on the intention of the producer. There are two gapless CDs. Therefore, in the gapless CD, the value as audio information recorded on the gapless CD can be fully enjoyed only by continuously reproducing a plurality of tracks recorded on the gapless CD.

And as a technique for ensuring the continuity of reproduction after executing the ripping process on the gapless CD, there are techniques described in Patent Documents 1 and 2, for example.
JP 2004-93729 A JP 2007-172668 A

  Here, when the conventional ENC process is executed for a plurality of tracks recorded on the gapless CD, the influence of the problems (I) and (II) is, for example, a re-encoded ENC file. The remarkably unnaturalness in hearing when playing a plurality of E's continuously, that is, the unnaturalness that the tracks of the gapless CD (ENC file E) that should be continuously played are intermittently played back for each track. It leads to presenting. This must be said to be extremely inconvenient as a reproduction mode of the track on the gapless CD.

  Therefore, the present application has been made in view of the above problems, and one example of the problem is that when the tracks are subjected to ENC processing in an order different from the recording order on the gapless CD, Encoding apparatus, encoding method, and encoding capable of executing continuous reproduction processing without generating unnecessary discontinuous portions even when the ENC file E is subjected to reproduction processing in the recording order of the original track in the gapless CD Is to provide a program.

In order to solve the above-mentioned problem, the invention according to claim 1 encodes each of a plurality of pieces of original information each composed of a plurality of information units and to be continuously reproduced in accordance with a preset reproduction order. An encoding unit such as an encoding unit, and a corresponding number of the information units corresponding to a delay time generated in the encoding unit in accordance with the encoding process of the original information in the encoding unit, The correspondence to the target original information, which is the original information that is the target of the conversion processing, belongs to the other original information to be reproduced immediately before in the reproduction order and is counted from the end of the other original information. The first input control means such as a system control unit that adds the information units of several minutes immediately before the target original information as the immediately preceding additional information unit and inputs the information to the encoding means, and the corresponding number of the information units Ah The information units corresponding to the corresponding number of the original information belonging to the other original information to be reproduced immediately in the reproduction order with respect to the target original information and counted from the head of the other original information are added immediately after. Second input control means such as a system control unit that is added immediately after the target original information as a unit and is input to the encoding means, and the target original to which the immediately preceding additional information unit and the immediately following additional information unit are added, respectively. A deletion unit such as a system control unit that deletes only the encoded information corresponding to the immediately preceding additional information unit from the encoded information obtained by encoding the information into the encoding unit, and the first input control unit And the second input control means includes the information corresponding to a number less than the decimal point among the numbers obtained by dividing the delay time by the processing time required when the one encoding unit is encoded by the encoding means. single The delayed by the processing time required to encode in said coding means is configured to the original information the immediately preceding additional information unit and the immediately following additional information units are respectively added to enter into the encoding means The

In order to solve the above-described problem, the invention according to claim 3 encodes each of a plurality of pieces of original information each composed of a plurality of information units and to be continuously reproduced according to a preset reproduction order. In an encoding method executed in an encoding device including encoding means such as an encoding unit to be encoded, the encoding method corresponds to a delay time generated in the encoding means accompanying the encoding process of the original information in the encoding means A corresponding number of the information units belonging to the other original information to be reproduced immediately before in the reproduction order with respect to the target original information that is the original information to be encoded A first input control step of adding the corresponding number of the information units counted from the end of the other original information as the immediately preceding additional information unit immediately before the target original information and inputting it to the encoding means; The corresponding number of the information units, which belongs to the other original information to be reproduced immediately after the target original information in the reproduction order and is counted from the head of the other original information. A second input control step in which the information unit is added immediately after the target original information as an immediately following additional information unit and input to the encoding means, and the immediately preceding additional information unit and the immediately following additional information unit are added respectively. the encoding by encoding information obtained by the object original information to the encoding means is, seen containing a deletion step, the to remove only coding information corresponding to the immediately preceding the additional information unit, wherein the first input control In the step and the second input control step, the number obtained by dividing the delay time by the processing time required when the one encoding unit is encoded by the encoding means is a fraction less than the decimal point. Said emotion The unit is delayed by a processing time necessary for encoding in the encoding means, and the original information to which the immediately preceding additional information unit and the immediately following additional information unit are added is input to the encoding means. Is done .

In order to solve the above-described problem, the invention according to claim 4 encodes each of a plurality of pieces of original information each constituted by a plurality of information units and to be continuously reproduced according to a preset reproduction order. the computer included in the encoding apparatus including encoding means for reduction, the first input control means according to claim 1 or 2, wherein the second input control means, and said deleting means, to function as a.
Brief Description of Drawings

FIG. 1 is a diagram illustrating a problem of the background art according to the present application.
FIG. 2 is a block diagram showing a schematic configuration of the copy reproduction apparatus according to the embodiment.
FIG. 3 is a flowchart showing copy reproduction processing according to the embodiment.
FIG. 4 is a diagram illustrating the content of redefinition processing according to the embodiment, (a) is a diagram illustrating the content of the redefinition processing for one track, and (b) is a plurality of consecutive It is a figure which illustrates the content of the said redefinition process about this track.
FIG. 5 is a flowchart showing an encoding process according to the embodiment.
FIG. 6 is a diagram showing a specific example of encoding processing according to the embodiment .

Explanation of symbols

The best mode for carrying out the inventions

  Next, the best mode for carrying out the present application will be described with reference to FIGS. In the embodiment described below, the present application is applied to a copying / playback apparatus that copies and plays back audio information for a plurality of tracks recorded on a gapless CD onto an information recording medium such as a hard disk. It is an embodiment.

  2 is a block diagram showing a schematic configuration of the copy reproduction apparatus according to the embodiment, FIG. 3 is a flowchart showing the copy reproduction process according to the embodiment, and FIG. 4 shows the contents of the redefinition process according to the embodiment. FIG. FIG. 5 is a flowchart showing the encoding process according to the embodiment, and FIG. 6 is a diagram showing a specific example of the encoding process.

  As shown in FIG. 2, the copying / reproducing apparatus S according to the embodiment includes a copying unit R, a reproducing unit P, a CD track management unit 7 including a TOC buffer 7A and a redefinition buffer 7B, and a first input control. A system control unit 8 as an example of each of the means, the second input control unit, and the deletion unit, an operation unit 9 including a remote controller or operation buttons, a display 10 including a liquid crystal display, and an HDD unit 11. Has been.

The copying unit R includes a disk drive 1, a reading control unit 2, an encoding input buffer 3, an encoding unit 4 as an example of an encoding unit, an encoding output buffer 5, a writing control unit 6, It is comprised by. Further, the reproduction unit P includes a read control unit 12, a decoding input buffer 13, a decoding unit 14, a decoding output buffer 15, a D (Digital) / A (Analog) converter 16, an amplifier unit 17, and a speaker 18. And is constituted by.
(I) Overall operation of copy reproduction apparatus S Next, the overall operation of the copy reproduction apparatus S will be described.

  First, the copying process according to the embodiment by the recording unit R will be described.

  In the gapless CD 400, a plurality of tracks T each composed of a frame 100 as a set of PCM samples are optically recorded on the gapless CD 400 as to be reproduced continuously.

  Then, when the gapless CD 400 is loaded, the disk drive 1 in the recording unit R rotates the gapless CD 400 at a preset rotation number, and further irradiates a reproduction light beam (not shown) to reflect the reflected light. , The PCM sample is detected and output to the read control unit 2. At this time, the TOC information is also read from the gapless CD 400.

  Next, the read control unit 2 temporarily stores the read TOC information in the TOC buffer 7A in the CD track management unit 7. Then, the read control unit 2 executes redefinition processing of TOC information for each ES 200 described later according to the embodiment while referring to the stored TOC information. The TOC information as the ES 200 related to the result of the redefinition process is temporarily stored in the redefinition buffer 7B. The redefinition process will be described in detail later with reference to FIGS. In addition, the ripping process according to the embodiment is completed with the redefinition process.

  Next, the read control unit 2 temporarily stores each ES 200 corresponding to each frame 100 read from the gapless CD 400 in the encoding input buffer 3 based on the TOC information after redefinition.

  As a result, the encoding unit 4 performs the ENC process according to the embodiment on the ES 200 accumulated in the encoding input buffer 3 to generate an ENC file in which the audio information recorded on the gapless CD 400 is re-encoded. This is temporarily stored in the output buffer 5 for encoding. In this embodiment, the encoding unit 4 re-encodes audio information in the gapless CD 400 into an ENC file that conforms to the AAC standard.

  Next, the writing control unit 6 reads the ENC file accumulated in the encoding output buffer 5 at a preset timing and stores it in the HDD unit 11.

  With the series of processes described above, the audio information copying process according to the embodiment is completed. The copying process using the recording unit R and the CD track management unit 7 is centrally controlled by the system control unit 8 in response to an instruction operation on the operation unit 9. Information to be presented to the user in the overall control is presented by the system control unit 8 via the display 10.

  Next, playback processing by the playback unit P will be described.

  First, the read control unit 12 reads an ENC file corresponding to the track T desired to be reproduced by the operation unit 9 from the HDD unit 11 and temporarily stores it in the decoding input buffer 13.

  Accordingly, the decoding unit 14 executes a decoding process based on the AAC standard on the ENC file based on the AAC standard stored in the decoding input buffer 13. As a result, the decoding unit 14 generates decoded data for each track T corresponding to the audio information recorded on the gapless CD 400 and temporarily stores the decoded data in the decoding output buffer 15.

  Next, the D / A converter 16 converts the decoded data stored in the decoding output buffer 15 into analog data, generates analog audio information, and outputs the analog audio information to the amplifier unit 17.

  Thereby, the amplifier unit 17 performs a preset amplification process or the like on the analog audio information and outputs it to the speaker 18 to emit sound.

Through the series of processes described above, the reproduction process of the audio information as the copy reproduction apparatus S is completed, and the sound corresponding to the audio information (ENC file) recorded in the HDD unit 11 is emitted from the speaker 18. . The reproduction process using the reproduction unit P is centrally controlled by the system control unit 8 in response to an instruction operation in the operation unit 9. Information to be presented to the user in the overall control is presented on the display 10 by the system control unit 8.
(II) Copying process including ripping process (redefinition process) according to the embodiment Next, the copying process including the ripping process according to the embodiment by the recording unit R and the CD track management unit 7 described above will be described in more detail. This will be described with reference to FIGS.

  As shown in FIG. 3, in the copying process according to the embodiment, the system control unit 8 always monitors whether or not the gapless CD 400 is loaded in the disk drive 1 (steps S1, S1; NO). When it is confirmed that the gapless CD 400 is loaded (step S1; YES), the system control unit 8 next determines whether or not the loaded optical disk is a CDDA using a conventional optical disk discrimination method. (Step S2). Thereby, when the loaded optical disk is an optical disk other than the CDDA (step S2; Others), the system control unit 8 ends the copying process according to the embodiment as it is. On the other hand, when the loaded optical disk is CDDA, the system control unit 8 next executes the ripping process according to the embodiment (steps S3 to S8).

  That is, as the ripping process, the system control unit 8 first reads the TOC information from the loaded gapless CD 400 (step S3). Next, the system control unit 8 sets the track number parameter indicating the track number to a value indicating the head track number in the gapless CD 400 loaded in a memory (not shown) provided for the system control unit 8 (step S4).

Next, the system control unit 8 sets the TOC information indicating the head of the track T whose track number is indicated by the value of the track number parameter at that time (that is, at the head position of the track T counted from the head of the gapless CD 400). The corresponding m (minutes), s (seconds), and f (frame) values) from the position on the gapless CD 400 where the value of the TOC information is “0 minute 0 second 0 frame” The cumulative PCM sample number calculated from the position is converted (step S5). In this conversion process, in general CDDA, the number of PCM samples corresponding to one frame is 588 samples as described above, and the number of frames corresponding to one second is usually 75 frames. Using the value of TOC information indicating
Cumulative sample number = (m × 60 + s) × 75 × 588
Run as.

  When the cumulative sample number is calculated, the system control unit 8 next divides the calculated cumulative sample number by the PCM sample number corresponding to one ES 200 and sets the result as the value of the parameter j. The parameter j is a parameter indicating the number of ESs 200 corresponding to one track T on the gapless CD 400 in the present embodiment. In addition to this, the system control unit 8 rounds down the fraction k which is the decimal point in the division (step S6).

Here, since the number of PCM samples corresponding to one ES in the general CDDA is, for example, 1024 samples as described above,
Cumulative sample number ÷ 1024 = j + k (j, k: natural number) → k round down.

The process of step S6 is illustrated using FIG. 4A. The track T1 on the gapless CD 400 shown in the uppermost part of FIG. 4A and the second stage from the upper part of FIG. In relation to the pre-encoding file R1 (the pre-encoding file R1 composed of a plurality of ES 200 before being re-encoded into the ENC file corresponding to the track T1 later), the ES 200 included in the pre-encoding file R1 the number corresponds to the value of the parameter j _1. Further, from the total number of PCM samples included as a plurality of frames 100 (six in the example shown in FIG. 4A) in the track T1, a plurality (three in the example shown in FIG. 4A) are included in the pre-encoding file R1. The number of PCM samples as the fraction sample 204 obtained by subtracting the total number of PCM samples included as the ES 200 is the fraction k ₁ .

Then, the system control unit 8 redefines the quotient “j” calculated in step S6 in accordance with the TOC information standard with the frame 100 as the CDDA as the minimum unit, and redefines the value. The data is temporarily stored in the buffer 7B (step S7). In the redefinition process in step S7, the value of the TOC information after the redefinition is M (minutes) S (seconds) F (frames), and the TOC information standard as CDDA with the frame 100 as the minimum unit. When the number of PCM samples that are “remainder” in conforming to “n” is “n”,
(M × 60 + S) × 75 × 588 + n = j × 1024
It becomes the relationship.

If the processing of this step S7 is illustrated using FIG. 4 (a), the relationship between the track T1 shown in the uppermost part of FIG. 4 (a) and the pre-encoding file R1 shown in the second stage from the top of FIG. 4 (a). , The total number of PCM samples included in the number of frames 100 obtained by subtracting “1” from the total number of frames 100 included in the track T1 is subtracted from the total number of PCM samples included as ES200 in the pre-encoding file R1. the above-mentioned more than _{n 1.}

  Here, the position information conforming to the standard of the TOC information after the redefinition, that is, the position information indicating the head of the pre-encoding file R indicated by M (minute) S (second) F (frame) + n (sample) is obtained. Hereinafter, this is referred to as “redefined position information”.

In the processing of steps S6 and S7, the parameter j ₁ in the relationship between the track T1 and the pre-encoding file R1 exemplified in the uppermost stage and the second stage from the top in FIG. When the number of samples k ₁ and the remainder n ₁ are respectively obtained, the TOC information indicating the head of the track T2 is converted into the cumulative number of samples in the processing of the immediately preceding step S5, not the TOC information indicating the head of the track T1. It is necessary to pay attention to this point. Therefore, when the track number parameter is set to a value indicating the first track number in the gapless CD 400 in the first step S4, the lead-in area in the gapless CD 400 is described in steps S5 to S7 immediately thereafter. The parameter j, the number k of PCM samples included in the fraction sample 204, and the remainder n are obtained.

  When the redefinition processing in accordance with the TOC information standard for the quotient “j” is completed in step S7, the system control unit 8 next performs the track number parameter that has been the target of the processing in steps S5 to S7. Is incremented by "1" (step S8).

  Thereafter, the system control unit 8 determines whether or not the value of the incremented track number parameter is within the range of the track T of the gapless CD 400 designated as the target of the copy reproduction processing according to the embodiment in the operation unit 9. Is determined (step S9). If it is within the range (step S9; YES), the system control unit 8 returns to step S5 and performs the steps S5 to S8 for the track T having the number indicated by the track number parameter after the increment. Repeat the process.

  The processes in steps S5 to S8 are repeated for the track T of the gapless CD 400 designated as the target of the copy reproduction process, so that, for example, as shown in the bottom row and the second row from the bottom in FIG. The fraction sample 204 is removed from the tail of each of the target tracks T1 to T3, and redefinition position information indicating the head position of each of the pre-encoding files R1 to R3 that has been advanced in timing by the amount of the removal. These are recorded in the redefinition buffer 7B as redefinition position information relating to the respective pre-encoding files R1 to R3. At this time, the audio information (sound itself) included at the head of each of the tracks T1 to T3 and the audio information included at the head of the pre-encoding files R1 to R3 corresponding to each of them are one each. It will be done.

  As shown in FIG. 4B, for example, four tracks T1 to T4 are recorded on the gapless CD 400, and when the processes of steps S5 to S8 are repeated for all of them, the result is as shown in FIG. 4 (b), the redefinition position information related to the pre-encoding files R1 to R4 is redefined as illustrated below. At this time, a part having a larger number of PCM samples than the corresponding track T4 is generated in the ES 200 located at the end of the pre-encoding file R4. This part is silent as illustrated in FIG. 4B. The redefined position information is redefined as the sample 201.

  In the redefinition position information described above, the value (m, s, f) of the TOC information indicating the head of the original track T and the redefinition position information indicating the head of the pre-encoding file R corresponding to the track T. The values (M, S, F) are not exactly the same as the position information viewed from the top of the gapless CD 400, because “remainder n (sample)” is added to the value of the redefined position information. However, the maximum value of the error is suppressed within one ES200 (about 20 milliseconds in the case of CDDA), and the original track T is originally reproduced continuously in relation to other adjacent tracks T. Since this is the track T of the gapless CD 400 to be performed, the error does not cause a problem in hearing.

  On the other hand, when the value of the track number parameter after increment exceeds the specified range in the determination in step S9 (step S9; NO), the system control unit 8 next displays the corresponding position information after redefinition. Based on this, the ENC process according to the embodiment is executed for each generated file R before encoding (steps S10 to S13).

  That is, as the ENC process, the system control unit 8 first confirms whether or not the execution of the ENC process is instructed by the operation unit 9 (step S10). If there is no such instruction (step S10; NO), the system control unit 8 ends the copying process according to the embodiment as it is. On the other hand, when an instruction to start the ENC process is given (step S10; YES), the system control unit 8 sets redefinition position information indicating the head of the pre-encoding file R that is the target of the ENC process. Obtained from the redefinition buffer 7B (step S11).

  Then, the system control unit 8 performs, based on the acquired redefinition position information, the ENC process for the pre-encode file R that is the target of the ENC process, with the ES 200 included therein as a unit. (Step S12).

  After that, when the ENC processing for one pre-encoding file R is completed, the system control unit 8 gives an instruction to execute the ENC processing to the other pre-encoding file R (track T) in the operation unit 9. It is confirmed whether or not (step S13). When the instruction is not made (step S13; NO), the system control unit 8 records the ENC file generated so far in the HDD unit 11, and ends the copying process according to the embodiment. On the other hand, when an instruction to start the ENC process is given to another pre-encoding file R (step S13; YES), the system control unit 8 performs the pre-encoding file R that is the target of the ENC process. On the other hand, the process returns to step S11 in order to repeat the processes of steps S11 and S12.

  Next, the ENC process according to step S12 will be described in detail with reference to FIGS. Here, in the encoder unit 4 that executes the ENC process, for the ENC process for one ES 200, for example, a delay time corresponding to 1.5 times the processing time required for the ENC process for the one ES 200 occurs. It shall be. This delay time changes depending on a specific re-encoding method in the ENC process.

The system control unit 8 as the processing of the step S12, first, the track T (hereinafter, the track T is referred to as a track T _n) corresponding to unencoded file R that is the object of ENC processing, original gapless CD400 In step S120, it is confirmed whether or not it is the first track T. And when was the beginning of the track T (step S120; YES), the system control unit 8, based on the redefined location information before encoding file R _n corresponding to the track T _n of the top the redefined location The PCM sample corresponding to the p-th preceding ES200 from the position indicated by is replaced with the silence sample 201 (step S121), and the process proceeds to step S123 described later. On the other hand, if the track _{T n} is not the beginning of the track T is determined at step S120 (step S120; NO), the system control unit 8, redefined corresponding to the unencoded file _{R n} to be subjected to ENC process The position information (that is, the reading position of the PCM sample from the gapless CD 400) is replaced with the redefined position information corresponding to the position p times before the position indicated by the redefined position information as ES200 (step S122). .

Next, the system control unit 8, the track _{T n} to check whether a track T of the last in the original gapless CD400 (step S123). And if the was last track T _n (step S123; YES), the system control unit 8 acquires the redefined position information indicating the head position of the lead-out area in gapless CD400 from redefining buffer 7B (Step S124). Based on the redefinition position information of the pre-encoding file R corresponding to the lead-out area, the system control unit 8 silences PCM samples corresponding to up to q pieces of ES200 from the position indicated by the redefinition position information. The sample 201 is replaced (step S125), and the process proceeds to step S128 described later. On the other hand, if the track _{T n} is not the end of the track T is determined at step S123 (step S123; NO), the system control unit 8, the track _{T n + 1} located next to the track _{T n} in gapless CD400 Redefinition position information indicating the head position of the corresponding pre-encoding file R _{n + 1} is acquired from the redefinition buffer 7B (step S126). The system control unit 8, the basis of the redefined location information, a redefined position information indicating a position corresponding to the q-number fraction as ES200 than the position indicated by the redefined location information, the end of the original track T _n The redefined position information indicating the position is used (step S127).

  Here, the values of “p” and “q” in steps S121, S122, S125, and S127 can be set in advance according to the compression method as the ENC file and the calculation method in the ENC processing, Also in the copy reproduction processing according to the embodiment, the values of “p” and “q” are preset and stored in the encoding unit 4 or the system control unit 8. More specifically, a minimum natural number (1.5 in the example shown in FIG. 5) exceeding the number obtained by dividing the delay time in the encoding unit 4 by the processing time required for the ENC processing for one ES 200 (1.5 in the example shown in FIG. 5). In the case illustrated in FIG. 5, “2”) is the value of “p” and “q”, respectively.

  Next, the system control unit 8 reads PCM samples from the set readout position (steps S121 and S122), and accumulates them in an input buffer (not shown) in the readout control unit 2 (step S128).

  Then, the system control unit 8 transfers the stored PCM samples to the encoding input buffer 3 while shifting the stored PCM samples by a timing corresponding to the preset s samples (step S129). The shift number “s” of the PCM samples related to the transfer process is set in advance according to the compression method as the ENC file and the calculation method in the ENC process in the same manner as the “p” and “q”, and the encoding unit 4 or This is stored in advance in the system control unit 8. More specifically, a number less than the decimal point in the number (1.5 in the case of FIG. 5) obtained by dividing the delay time in the encoding unit 4 by the processing time required for ENC processing for one ES 200 (In the example shown in FIG. 5, “0.5”) is the value of “s”.

  Thereafter, the system control unit 8 reads one ES 200 from the encoding input buffer 3 and causes the encoding unit 4 to execute ENC processing (step S130).

Next, the system control unit 8 confirms whether or not the ENC processing for the ES 200 from the start of the ENC processing for the pre-encoding file R corresponding to the track T _n has been completed (step S131). The number “r” of ESs 200 related to this confirmation processing is also set in advance in the encoding unit 4 or the system control unit 8 in accordance with the compression method as the ENC file and the calculation method in the ENC processing, similarly to the “p” and the like. Is stored in advance. More specifically, a minimum natural number (1.5 in the example shown in FIG. 5) exceeding the number obtained by dividing the delay time in the encoding unit 4 by the processing time required for the ENC processing for one ES 200 (1.5 in the example shown in FIG. 5). In the case illustrated in FIG. 5, “2”) is the value of “r”.

  If it is determined in step S131 that the ENC processing has not yet been completed for the r ESs 200 (step S131; NO), the ENC file after the ENC processing is stored in a memory (not shown) in the CD track management unit 7. Save temporarily (step S133). On the other hand, in step S131, when the ENC processing for the r ESs 200 is completed (step S131; YES), the system control unit 8 discards the r ENC files (step S132).

Next, the system control unit 8, gapless read position from CD400 confirms whether the transition to the end of the track _{T n} set in the processing of step S125 or S127 (step S134). Then, when said reading position is not the transition to the end of the track _{T n} (step S134; YES), the system control unit 8 updates the read position (step S135), the then returns to step S128 For the PCM sample recorded at the updated read position, the processes of steps S128 to S135 are executed.

In contrast, in the determination of step S134, when the read position from the gapless CD400 has a transition to the end of the track _{T n} set in the processing of step S125 or S127 (step S134; NO), 3 The process proceeds to step S13.

  Next, the ENC process according to the embodiment described with reference to FIG. 5 will be described more specifically with reference to FIG.

In the ENC process according to the embodiment, as a result of the presence of a delay time in the encoder unit 4 (in the case shown in FIG. 5, a delay time corresponding to 1.5 times the playback time of one ES 200), in order to prevent the end will be missing, as illustrated in the top 6, a plurality of ES200 n + ₁ and in the encoding before the beginning portion of the file R _{n + 1} immediately after the unencoded file R _n being ENC processed ES200 _{n + 2} extra read into the encoding unit 4, by executing the ENC processing for the extra ES200 _{n + 1} and ES200 _{n + 2} to the encoding unit 4, ES200 _n contained in the end of the original unencoded file _{R n} Is surely encoded by the encoding unit 4 and the result of the ENC processing is Forcibly output from the encoding unit 4 to illustrate down code data 300 _n 6 at the bottom.

In addition to this, in the ENC processing according to the embodiment, in order to prevent a silent sample from being inserted at the head of the ENC file subjected to ENC processing as a result of the existence of the delay time, an example is shown in the uppermost part of FIG. to such, to read the encoded before file _{R n} unencoded file _{R n-1} of the last portion of the ES200 _-1 and ES200 _-2 extra encoded portion 4 just before that are ENC process, the extra ES200 to execute the ENC process for further encoding unit ENC file _{E n-1} consisting of the encoded data _{300 -1} and the encoded data _{300 -2} come outputted from 4 6 at the bottom as a result of the ENC process Discard as illustrated.

By these processes, an encoding pre-file R _n, without silence sample 201 whose end or is inserted into the top or missing, the encoded data 300 ₀ to the encoding corresponding to the encoded before file R _n All of the data 300 _n is output from the encoding unit 4.

For this reason, as illustrated in FIG. 5, the system control unit 8 stores the pre-encoding file R _n−1 before the original pre-encoding file R _n as ES 200 (two in the case illustrated in FIG. 6). Loading ES200 _-1 and ES200 _-2 from the end portion (step S122) causes subjected to ENC processing, (2 pieces of the case illustrated in FIG. 6) q pieces worth as ES200 from the original unencoded file _{R n} The ES200 _{n + 1} and ES200 _{n + 2} are read from the head portion of the subsequent pre-encoding file R _{n + 1} (step S127) and used for ENC processing.

  In the actual ENC process, the system control unit 8 is equivalent to the PCM samples corresponding to the s ESs (0.5 in the case illustrated in FIG. 6) ES200 as illustrated in the second row from the top in FIG. The ENC process is executed by shifting the timing later (steps S129 and S130).

Then the system control unit 8, the encoded data 300 of the r The encoded before file R _n corresponding to the extra end portion of the front encoding you ENC treated File R _n-1 (2 or if illustrated in FIG. 6) discard composed ENC file _{E n-1 -1} and the encoded data _{300 2} (step S132).

  In FIG. 6, the ES 200 and the encoded data 300 within one rectangular broken line are the ES 200 and the encoded data 300 each including the same audio information.

As described above, according to ENC processing in the copying reproducing apparatus S according to the embodiment, the ES200 number of which corresponds to the delay time in the encoding unit 4, by adding immediately before and after encoding previous file R _n encoded because thereof resulting remove from ENC file _{E n} only encoded data _{300 -2} and _{300 -1,} which corresponds to ES200 was added immediately before the unencoded file _{R n} obtained (discarded), the encoding of the previous file _{R n} code even if the delay time in the encoding unit 4 generates to perform processing, it is possible to generate an ENC file E _n is reliably encode all unencoded file R _n to be encoded.

  Therefore, even when a plurality of pre-encoding files R to be reproduced continuously are encoded for each pre-encoding file R without following the reproduction order, unnecessary data is inserted at the beginning and encoded. And the loss of the last data (see FIG. 1) can be prevented, and all of the single pre-encoding file R can be reliably encoded. Even when the pre-encoding file R is reproduced continuously in the order of reproduction, it is possible to prevent the occurrence of unnecessary discontinuous portions.

  In addition, the number of ESs 200 added immediately before and after the pre-encoding file R is a minimum larger than the number obtained by dividing the delay time in the encoding unit 4 by the processing time required for encoding one ES 200. Since it is a natural number, it is possible to effectively prevent an unnecessary increase in encoding time and lack of continuity between ENC files E by adding and encoding only the minimum necessary number of ESs 200.

  Further, among the numbers obtained by dividing the delay time in the encoding unit 4 by the processing time required for encoding one ES 200, the processing time (ES200 required for encoding the ES 200 for a number less than the decimal point. The ES200 adds the pre-encoding file R added immediately before and immediately after the ES 200 to the encoding unit 4, so that the pre-encoding file R to which the ES 200 is added is input to each ES 200. All can be encoded without omission.

  Note that in the decoding unit 14 of the reproducing unit P according to the above-described embodiment, a delay time similar to that of the encoding unit 4 occurs in the decoding process, so that a silence sample may be inserted into the decoding result. It is known. However, in this case, when decoding the ENC file E related to the continuous track T such as the gapless CD 400, the decoding unit 14 is not initialized between the temporally continuous ENC files E, thereby inserting the silent part. Can be prevented.

Also, programs corresponding to the flowcharts shown in FIGS. 3 and 5 are recorded in an information recording medium such as a flexible disk or a hard disk, or acquired and recorded via the Internet or the like. By reading and executing by a computer, the computer can be used as the encoding unit 4 and the system control unit 8 according to the embodiment.
Explanation of symbols
1 disk drive
2,12 Read controller
3 Input buffer for encoding
4 Encoding section
5 Output buffer for encoding
6 Write controller
7 CD Track Management Department
7A TOC buffer
7B Redefinition buffer
8 System controller
9 Operation part
10 display
11 HDD section
13 Input buffer for decoding
14 Decoding part
15 Decoding output buffer
16 D / A converter
17 Amplifier
18 Speaker
100 frames
200 ES
300 encoded data
400 gapless CD
S Copy reproduction device
R Copying part
P Playback unit
T track
R Pre-encoded file
E ENC file

Claims (4)

Encoding means for encoding each of a plurality of pieces of original information each constituted by a plurality of information units and to be continuously reproduced according to a preset reproduction order;
A corresponding number of the information units corresponding to the delay time generated in the encoding means accompanying the encoding process of the original information in the encoding means, and the original information that is the target of the encoding process The information units corresponding to the corresponding number of the original information belonging to the other original information to be reproduced immediately before in the reproduction order with respect to the target original information, A first input control means for adding to the encoding means and inputting it immediately before the target original information as a unit;
The corresponding number of the information units, which belongs to the other original information to be reproduced immediately after the target original information in the reproduction order and is counted from the head of the other original information. Second input control means for adding the information unit of minutes as an additional information unit immediately after the target original information and inputting it to the encoding means;
Only the encoded information corresponding to the immediately preceding additional information unit is deleted from the encoded information obtained by encoding the target original information to which the immediately preceding additional information unit and the immediately following additional information unit are respectively added to the encoding means. Delete means to
Equipped with a,
The first input control means and the second input control means are less than the decimal point in the number obtained by dividing the delay time by the processing time required when the encoding means encodes one information unit. The information unit is delayed by a processing time required when the encoding unit encodes the original information to which the immediately preceding additional information unit and the immediately following additional information unit are added respectively. A coding apparatus characterized by being input to The encoding device according to claim 1, wherein
The encoding is characterized in that the corresponding number is a minimum natural number larger than a number obtained by dividing the delay time by a processing time required for encoding the one information unit in the encoding means. apparatus. In an encoding method executed in an encoding device including an encoding unit configured to encode each of a plurality of original information, each of which is constituted by a plurality of information units and is to be continuously reproduced in accordance with a preset reproduction order. ,
A corresponding number of the information units corresponding to the delay time generated in the encoding means accompanying the encoding process of the original information in the encoding means, and the original information that is the target of the encoding process The information units corresponding to the corresponding number of the original information belonging to the other original information to be reproduced immediately before in the reproduction order with respect to the target original information, A first input control step of adding to the encoding means just before the target original information as a unit,
The corresponding number of the information units, which belongs to the other original information to be reproduced immediately after the target original information in the reproduction order and is counted from the head of the other original information. A second input control step of adding the information unit of minutes as an additional information unit immediately after the target original information and inputting it to the encoding means;
Only the encoded information corresponding to the immediately preceding additional information unit is deleted from the encoded information obtained by encoding the target original information to which the immediately preceding additional information unit and the immediately following additional information unit are respectively added to the encoding means. Delete process to
Including
In the first input control step and the second input control step, the decimal point of the number obtained by dividing the delay time by the processing time required when the one encoding unit is encoded by the encoding means. The original information to which the immediately preceding additional information unit and the immediately following additional information unit are respectively added is delayed by a processing time required when encoding the information units of a number less than a few by the encoding means. An encoding method characterized by being input to the means. A computer included in an encoding device including an encoding unit configured to encode each of a plurality of original information, each of which is constituted by a plurality of information units and is to be continuously reproduced in accordance with a preset reproduction order. An encoding program that functions as the first input control unit, the second input control unit, and the deletion unit according to 1 or 2 .

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