JP2013097839A - Sound output start time during ripping shortening processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a "sound output start time during ripping shortening processor" capable of preventing sound skipping and petit-noise by achieving a sound output start time equivalent to a normal playback time with no ripping even in playback during ripping.SOLUTION: The sound output start time during ripping shortening processor includes an SPM for reading data with a subcode of a CD and storing it specified quantity, an LSI for reading data from the SPM and performing an audio output of the data, an encoder for reading the data with a subcode of the CD and creating compressed audio obtained by adding a plurality of subcodes to a tag, a recording medium for storing data encoded by the encoder, and a decoder for decoding data recorded in the recording medium to make the data to data with a subcode read from the CD, inputs data of the decoder in the SPM, and playbacks the data of the decoder when the data from the decoder catches up with SPM data in playback.

Description

  The present invention relates to an audio output start time reduction processing device at the time of ripping that can prevent output of audio or the like from being delayed due to ripping processing when listening to music or the like while ripping a CD.

  Conventionally, when listening to music with a CD, for example, when playing a music CD as shown in FIG. 4 (a), for example, data is read from a CD disk at 8 × speed and stored in an SPM (Shock Proof Memory). / SPM control LSI is used to output audio at 1x speed.

  When the SPM capacity exceeds the specified capacity, reading is temporarily stopped, and when the capacity drops below the specified capacity, the CD is played back by resuming the reading, and the reading cannot be performed due to vibration of the device or the like. The provided playback process is performed. In this case, the reproduction is delayed for about 3 seconds until the predetermined amount of buffer is read into the first SPM before the start of audio output, but this degree is not a big problem. The data at this time is the normal CD playback data itself with one audio data per subcode, and therefore the data stored in the SPM is also the normal CD playback data with one audio data per subcode. −

  It is also possible to listen while recording from a music CD while recording it on an HDD or the like while ripping from a music CD, ie, compressing the music CD into another format such as MP3. This method is widely used as a convenient method because it can create data that allows music to be listened to by another compressed audio playback device while listening to music.

  Note that the reading unit reads the Q subcode information from a CD including a plurality of song data and Q subcode, and the control unit reads all of the song data included in the CD based on the read Q subcode. From the above, a plurality of song data having no silent time between songs is detected, and the Q subcode is converted so that the detected plurality of song data becomes a single song data. The control unit and the encoder extract a plurality of detected music data from the CD based on the converted Q subcode, compress the data in a predetermined compression format, and the playback unit plays back the compressed music data. When there is no silent time between some songs among all the song data recorded on the storage medium, and a plurality of song data including some songs are compressed. However, Patent Document 1 discloses a technique for making a music data processing apparatus capable of eliminating sound interruption during reproduction of compressed music data.

JP 2008-251097 A

  However, at the time of such ripping reproduction, the music data acquired from the disk drive is temporarily encoded and stored in the HDD or the like in a compressed audio file format such as mp3, the stored file is decoded again and reproduced, and the sound is output. This is realized by pseudo parallel processing. Since the sound output cannot be started until this series of preparations are completed, it takes about 10 to 20 seconds for a normal song until the start of playback (the first sound output).

  The operation at this time is as shown in FIG. 4 (b). First, the reproduction data of a normal CD with one audio data in one subcode is converted into data in which many audio data are attached to a tag such as mp3 by an encoder. This is recorded in the HDD or the like. Thereafter, this data is applied to a decoder, and the audio data is made continuous, and reproduction processing is performed. Since this series of processes takes time, no sound is produced for a while after starting ripping reproduction.

 The user does not know that this is happening, and even if he / she knows it, it will be annoying because there will be no sound for a long time to play while ripping. Therefore, it is desirable that sound be produced immediately even during such ripping reproduction.

  Therefore, the main object of the present invention is to provide an apparatus capable of realizing the same audio output start time as that during normal reproduction without ripping, even during reproduction during ripping. Also, when switching from disk playback to playback of files recorded on an HDD, etc., the purpose is to be able to perform seamless playback that prevents skipping and petit noise, and it does not require a large memory capacity and remains in its current configuration. The object is to realize an apparatus that can be realized and does not involve an increase in cost.

  In order to solve the above-mentioned problem, the ripping audio output start time shortening processing apparatus according to the present invention reads the data with the subcode of the CD, stores the predetermined amount of data, and reads the data from the SPM and outputs the audio. An encoder that reads data with a subgod of a CD and creates compressed audio with a plurality of subcodes added to a tag, a recording medium that stores data encoded by the encoder, and data recorded on the recording medium And a decoder for sub-code data read from the CD, and when the decoder data is put into the SPM and the data from the decoder catches up with the reproduced SPM data, the next sub-code To output decoder data.

  According to another aspect of the present invention, there is provided an audio output start time reduction processing device for ripping, wherein the audio output start time reduction processing device for ripping performs CD reproduction without ripping by the SPM and the LSI. And

  Since the present invention is configured as described above, an audio output start time equivalent to that during normal reproduction without ripping can be realized even during reproduction during ripping. Also. Even when switching from disk playback to a state in which a file such as mp3 is played back, it is possible to perform seamless playback while preventing skipping and petit noise. In addition, a large memory capacity is not required, the present configuration can be realized, and a device without an increase in cost can be obtained.

It is a functional block diagram of the present invention. It is an operation | movement flowchart of the Example. It is a data block diagram of a prior art example and this invention. It is a figure which shows a prior art example.

  First, the basic principle of the present invention will be described. In the present invention, as shown in FIG. 1, a CD 1 is reproduced as in the prior art, a predetermined amount of data is stored in an SPM (shock proof memory) 2 and is reproduced by a speaker 4 while being controlled by a Servo / SPM control LSI 3. Output. Therefore, reproduction can be reproduced and output with a delay of about 3 seconds as in the conventional apparatus. However, this is only the first time, and this regeneration operation will be stopped later. At this time, the data entering the SPM is a data in which one audio data is added to one subcode as shown in FIG. 1A and the conventional FIG.

  Further, this apparatus is provided with an encoder 5 for reproducing a CD and creating compressed audio such as mp3 as in the conventional ripping, and compresses data and records it on the HDD 6 or the like. In this encoder 5, however, a normal CD reading data in which one audio data is added to one subcode as shown in FIGS. 4B and 4A is shown in FIGS. As shown in the figure, a tag is provided with a number of subcodes and a number of audio data attached thereto.

  This data is recorded in the HDD 6 or the like as it is, and can be reproduced as normal audio data such as mp3 with a tag. This subcode is an independent data area different from the 2352-byte audio signal, and can be synchronized with the audio signal of the main body because it includes time axis information as control data.

  After that, in the decoder 7, the data is added with one audio data to one sub-gorge as shown in FIGS. 4B and 4C, that is, the same as the normal CD read data, and this is input to the SPM 2. . In SPM2, the previously filled data is played back, and the first part of the first song enters after the above process with a delay of about 10 to 20 seconds.

  After that, data is successively input as a result of being processed at high speed by the decoder, so that it overlaps with a specific part of the music currently being reproduced from the SPM. Since this state can be understood because time is output in the subcode, the music reproduced by the decoder 7 is subsequently reproduced and reproduced. Here, as in the normal operation of the SPM, data exceeding a predetermined value is not read, and therefore, the decoder 7 does not reproduce it, but continues to reproduce it when it falls below the predetermined value in the SPM. You can continue ripping CDs for all songs.

  In addition, there is a method to prevent the occurrence of sound skipping and petit noise by switching the first song to disk playback and switching the second and subsequent songs to file playback. However, it is necessary to secure an SPM that buffers data for one song. It becomes. In the current standard on the Red Book, the maximum length of a song is 74 minutes. When aiming for seamless playback with no skipping or petit noise, an SPM capacity of at least 650 MBytes is required. Not realistic.

  The above operation can be performed by the operation flow shown in FIG. That is, in the CD reproduction process shown in FIG. 2, it is determined whether or not the reproduction process is performed while first ripping (step S1). Here, when performing the process of reproduction while ripping, the process proceeds to step S2, and the read data of the CD is output to both the SPM and the ripping encoder.

  Next, the SPM data is immediately reproduced and output, and thereafter this operation is continued (step S3). As a result, when the amount exceeds the predetermined amount stored in the SPM, the reproduction can be performed, so that the reproduction can be performed with a delay of about 3 seconds.

  Subsequently, a subcode is added to the tag of the encoded data to produce compressed audio and output to the recording medium (step S4). This operation is performed by adding a subcode to the tag in the encoder 5 of FIG.

  Subsequently, the compressed audio with subcode from the encoder is sequentially stored in the recording medium (step S5). This is done by sequentially recording in the HDD in FIG. Next, the compressed audio with subcode stored in the recording medium is decoded, and the subcode is added and stored in the SPM (step S6). Thereafter, the time data currently reproduced and output from the SPM is detected (step S7).

  Subsequently, it is determined whether or not the data input from the decoder is the same as the data currently being reproduced and output (step S8). If it is determined that the time has not yet reached, the process returns to step S6 again to decode the compressed audio with subcode stored in the recording medium, add the subcode, and continue the process of storing in SPM.

  Thereafter, when it is detected that the data input from the decoder has reached the same time as the data currently being reproduced and output, the data reproduced and output from the SPM is switched to the data from the encoder (step S9). In this operation, when it is detected from the subcode that the data input from the decoder is the same time as the data currently being reproduced and output, the data from the decoder is switched when the next subcode is reached. Thus, switching can be performed without generating a small noise or the like.

  FIG. 2 also shows normal reproduction of a CD without ripping. In this case, the read data of the CD is output and stored in the SPM (step S10), and then the SPM data is reproduced and output to continue this operation. Thus, reproduction output is immediately performed (step S11). Subsequently, it is determined whether or not the SPM data exceeds the upper limit predetermined amount (step S12). If the predetermined amount is not yet reached, the operation returns to step S10 to continue outputting the CD read data to the SPM and storing it. To do.

  Thereafter, when it is determined in step S12 that the SPM data has exceeded the upper limit predetermined amount, the process proceeds to step S13, reading from the CD is stopped, and reproduction is continued. Thereafter, it is determined whether or not the SPM data has become equal to or lower than a predetermined lower limit value. If not, the process returns to step S13 to stop reading from the CD and continue reproduction. When it is determined that the SPM data has reached the lower limit predetermined amount, the process returns to step S10 to continue the operation of outputting and storing the CD read data to the SPM.

  As explained above, utilizing the subcode which is an independent data area different from the 2352-byte audio signal, utilizing the fact that the time axis information is provided as control data, synchronizing with the audio signal of the main body, By making use of this characteristic and adding it to the decoded audio signal, it can be handled as if it were data read from the disk. In addition, this correspondence enables accurate sound connection processing even when switching from disk playback to file playback in the middle of a song. Further, this operation can be performed only by using a circuit that has not been used conventionally, and it is not necessary to prepare an SPM for one song in order to switch in units of songs.

1 CD
2 SPM
3 LSI
4 Speaker 5 Encoder 6 HDD
7 Decoder

Claims (2)

SPM that reads data with subcode of CD and stores a predetermined amount;
LSI that reads data from SPM and outputs audio;
An encoder that reads data with sub-god of CD and creates compressed audio with multiple sub-codes added to the tag;
A recording medium for storing data encoded by the encoder;
A decoder that decodes the data recorded on the recording medium and converts it into data with a subcode read from a CD;
The decoder data is input to the SPM, and when the data from the decoder catches up with the reproduced SPM data, the decoder data is output from the next subcode. Processing equipment.   2. The audio output start time reduction processing apparatus for ripping according to claim 1, wherein CD reproduction without ripping is performed by the SPM and the LSI.

Images