JP2006079740A - Device, method and program for processing information - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform processing based on waveform information even when DSD data is treated. <P>SOLUTION: DSD data supplied from a DSD device 2 through an I/O 51 during recording is converted into PCM data by an LPF 57. For the conversion by the LPF 57, conversion small in number of taps and capable of easily executing calculation, i.e., rough conversion, is used. The PCM data obtained by the LPF 57 becomes PCM data for meter display, and the volume of the DSD data being recorded is meter-displayed by a meter display control part 58 based on the PCM data. The invention is applied to a personal computer capable of processing the DSD data. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an information processing apparatus, method, and program, and in particular, an information processing apparatus, method, and program capable of performing processing based on waveform information even when handling DSD (Direct Stream Digital) data About.

  In recent years, audio signals from analog sound sources such as records and cassette tapes and digital audio data from digital sound sources such as CD (Compact Disk) and DAT (Digital Audio Tape) have been imported into personal computers, and various effects and arrangements have been made. So-called DTM (Desk Top Music), which creates your favorite audio data by editing, is gaining popularity.

  In such a DTM, there is a high demand for higher sound quality. For example, audio data of a 44.1 KHz / 16-bit music CD (audio data encoded by the PCM (Pulse Code Modulation) method) is 96 KHz or higher. Upsampling is performed at a sampling frequency of 20 or 24 bits, and requantization is performed using a number of qubits such as 20 bits and 24 bits. Thus, basically, audio data with higher sound quality than that of a music CD can be obtained.

  By the way, there is a SACD (Super Audio CD) format as a format of audio data having higher sound quality than a music CD, and a DSD method is adopted as an encoding method of audio data recorded in the SACD.

  Here, the DSD method will be briefly described.

  As shown in FIG. 1, the DSD system represents an audio signal with a sampling frequency of 44.1 KHz (hereinafter referred to as 1 fs as appropriate) and a qubit number of 16 bits. This is a coding method that represents a sound signal with 1-bit data at a sampling frequency of 44.1 kHz × 64 = 2.8224 MHz (64 fs). One block in FIG. 1 represents 1-bit data.

  According to the DSD method, the level of the audio signal can be expressed by the density of the pulse waveform (1, 0), so that a waveform close to the sound wave itself that transmits the space can be expressed, and a reproduction band exceeding 100 KHz. It is possible to secure a high dynamic range.

  DSD is disclosed in Patent Document 1. Patent Document 2 discloses a technique for converting audio data which is multi-bit data (16 bits) taken from a CD into DSD data (audio data encoded by the DSD method). Further, Japanese Patent Application Laid-Open No. 2004-151867 discloses a technique that enables processing of amplitude components such as fade-in / out on DSD data.

JP-A-6-232755 JP-A-9-261071 JP-A-8-274644

  By the way, since the sequence of 1 and 0 of DSD data that appears only in 64 periods in 1 fs does not directly have the waveform information (amplitude information) of the original audio signal, for example, DSD is sent from an external device to a personal computer. Performs processing based on waveform information, such as displaying the volume of the DSD data being captured when the data is captured, and automatically starting recording when a volume above the specified threshold is detected. There was a problem that it was not possible.

  These processes are all possible when handling PCM data in which the waveform information of the original audio signal is represented by a predetermined number of bits such as 16 bits.

  The present invention has been made in view of such a situation, and enables processing based on waveform information to be performed even when DSD data is handled.

  The information processing apparatus according to the present invention, when recording or reproducing DSD data, the conversion means for roughly converting the DSD data to be recorded or reproduced into audio data of another encoding method having the waveform information of the original audio signal; And processing means for performing processing based on waveform information based on audio data obtained by rough conversion by the conversion means.

  The processing means can display the volume of the DSD data as a process based on the waveform information when recording or reproducing the DSD data.

  The processing means can start recording of the DSD data when a sound volume equal to or higher than a predetermined threshold is detected as the processing based on the waveform information when recording the DSD data.

  The processing means, as a process based on the waveform information when recording the DSD data, may determine the position of the detected DSD data as a break of the music when a volume below a predetermined threshold is detected. it can.

  The information processing method of the present invention includes a conversion step of roughly converting DSD data to be recorded or reproduced into audio data of another encoding method having waveform information of the original audio signal when recording or reproducing DSD data. And a processing step of performing processing based on waveform information based on audio data obtained by rough conversion by the processing of the conversion step.

  When recording or playing back DSD data, the program of the present invention roughly converts the DSD data to be recorded or played back into audio data of another encoding system having waveform information of the original audio signal, Based on the audio data obtained by the coarse conversion by the processing of the step, the computer is caused to execute processing including processing steps for performing processing based on the waveform information.

  In the information processing apparatus and method and the program of the present invention, when recording or reproducing DSD data, the DSD data to be recorded or reproduced is converted into audio data of another encoding method having waveform information of the original audio signal. The processing based on the waveform information is performed on the basis of the audio data obtained by the rough conversion and the rough conversion.

  According to the present invention, processing based on waveform information can be performed even when DSD data is handled.

  Embodiments of the present invention will be described below. The correspondence relationship between the invention described in this specification and the embodiments of the invention is exemplified as follows. This description is intended to assure that embodiments supporting the claimed invention are described in this specification. Therefore, although there is an embodiment which is described in the embodiment of the invention but is not described here as corresponding to the invention, it means that the embodiment is not It does not mean that it does not correspond to the invention. Conversely, even if an embodiment is described herein as corresponding to an invention, that means that the embodiment does not correspond to an invention other than the invention. Absent.

  Further, this description does not mean all the inventions described in this specification. In other words, this description is for the invention described in the present specification and not claimed in this application, i.e., the existence of an invention that will be filed in the future or added by amendment. There is no denial.

  The information processing apparatus according to claim 1, when recording or reproducing DSD data, the DSD data to be recorded or reproduced is converted into audio data of another encoding method having waveform information of the original audio signal (for example, PCM data) conversion means (for example, LPF 57 in FIG. 5) and processing means for performing processing based on the waveform information based on the audio data obtained by the rough conversion by the conversion means (for example, FIG. 5) 5 meter display control unit 58).

  6. The information processing method according to claim 5, wherein when recording or reproducing DSD data, the DSD data to be recorded or reproduced is roughly converted into audio data of another encoding method having waveform information of the original audio signal. A converting step (for example, step 2 in FIG. 7), and a processing step for performing processing based on the waveform information based on the audio data obtained by the rough conversion by the processing in the converting step (for example, step in FIG. 7). S3).

  Also in the program according to claim 6, the embodiment (however, an example) to which each step corresponds is the same as the information processing method according to claim 5.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 2 is a diagram showing a configuration example of a recording / playback system to which the present invention is applied.

  The recording / playback system of FIG. 2 is configured by connecting a personal computer 1 and a DSD device 2 via, for example, a USB (Universal Serial Bus) cable 3.

  The personal computer 1 receives the DSD data (audio data encoded by the DSD method) supplied from the DSD device 2 via the USB cable 3 and stores the received DSD data in an HDD (Hard Disk Drive). Remember (record). The DSD data recorded on the HDD is appropriately played back, edited, etc. by the user.

  When recording the DSD data, for example, the DSD data is converted into PCM data having waveform information (audio data encoded by the PCM method), and based on the PCM data obtained by the conversion, as shown in FIG. A meter indicating the volume of the music being recorded is displayed. At the time of recording, for example, the volume of the recorded part is represented by a color distribution.

  The DSD data 1 and 0 sequence itself does not directly have the waveform information of the original audio signal (the audio signal from which the DSD data was generated), and if the DSD data is used as it is, a volume meter display based on the waveform information Therefore, conversion to PCM data is performed once for meter display, and meter display is performed based on the PCM data obtained by the conversion. The PCM data is data having waveform information of the original audio signal based on each sample value of a predetermined quantization bit number such as 16 bits.

  Thus, even when recording DSD data, the user can do so while confirming the volume of the recorded portion, as in the case of recording PCM data.

  In addition, in the personal computer 1, in addition to the meter display when recording DSD data, automatic recording of DSD data that starts recording without a user operation when a volume higher than the threshold is detected, and below the threshold, is detected. When the sound volume is detected, an automatic detection process for determining the detected position as a music break is performed based on the waveform information of the PCM data obtained by converting the DSD data to be recorded.

  Furthermore, a volume meter display or the like when reproducing the recorded DSD data is also performed based on the waveform information of the PCM data obtained by converting the DSD data to be reproduced.

  The DSD device 2 is an audio device capable of processing DSD data, and is driven according to control performed by the personal computer 1 via the USB cable 3. For example, the DSD device 2 generates DSD data from an analog audio signal input from the outside, and outputs the generated DSD data to the personal computer 1.

  The processing of the personal computer 1 performed based on the waveform information of the PCM data obtained by converting the DSD data as described above will be described later with reference to a flowchart.

  FIG. 4 is a block diagram illustrating a configuration example of the personal computer 1 of FIG.

  A CPU (Central Processing Unit) 11 executes various processes according to a program stored in a ROM (Read Only Memory) 12 or a program loaded from an HDD 19 to a RAM (Random Access Memory) 13. The RAM 13 also appropriately stores data necessary for the CPU 11 to execute various processes.

  The CPU 11, ROM 12, and RAM 13 are connected to each other via a bus 14. An input / output interface 15 is also connected to the bus 14.

  An input unit 16, a display unit 17, a PCM device 18, an HDD 19, a communication unit 20, and a USB interface 21 are connected to the input / output interface 15.

  The input unit 16 includes a keyboard and a mouse, and the display unit 17 includes an LCD (Liquid Crystal Display). When recording the DSD data, the display unit 17 displays a volume meter as shown in FIG.

  The PCM device 18 reproduces PCM data generated from, for example, DSD data stored in the HDD 19 under the control of the CPU 11 and outputs the obtained audio signal from a speaker (not shown).

  The HDD 19 stores various data such as DSD data in a built-in hard disk. In the example of FIG. 4, the audio data processing application 31 is also stored in the HDD 19. The audio data processing application 31 is executed by the CPU 11 and realizes various functions related to processing of audio data such as DSD data and PCM data.

  The communication unit 20 performs communication processing via a network, and the USB interface 21 performs communication with the DSD device 2 via the USB cable 3. As described above, the DSD data generated by the DSD device 2 is supplied from the DSD device 2 to the USB interface 21.

  A drive 22 is connected to the input / output interface 15 as necessary. A removable medium 23 composed of a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is appropriately attached to the drive 22, and a computer program read from the removable medium 23 is installed in the HDD 19 as necessary.

  FIG. 5 is a block diagram illustrating a functional configuration example of the personal computer 1. Each functional unit of the personal computer 1 shown in FIG. 5 is realized by the audio data processing application 31 being executed by the CPU 11 of FIG. FIG. 5 also shows some functional units of the DSD device 2.

  An I / O (Input / Output) 51 of the audio data processing application 31 is an audio driver, controls the DSD device 2, receives DSD data supplied from the DSD device 2, and controls recording of the received DSD data. Output to the unit 52 and LPF (Low Pass Filter) 57. For example, as shown in FIG. 6A, DSD data in units of blocks configured by a predetermined number of DSD data of 64 samples (64 1 bits appearing in a period of 64 fs) is supplied from the DSD device 2.

  FIG. 6B is a diagram illustrating an example of a block that is a unit of PCM data transmission / reception performed between the personal computer 1 and the DSD device 2 when the DSD device 2 can also handle PCM data. As shown in FIG. 6B, the block serving as a transmission / reception unit in the case of PCM data is the content of sub-blocks constituting one block (64 samples for DSD data, the case of PCM data compared to DSD data). Is different only by 1 sample (16 bits). Therefore, basically, the same mechanism can be used when only DSD data is handled and when PCM data is handled, and only the contents of one sub-block are different.

  Further, the I / O 51 transmits the DSD data supplied from the ΔΣ modulator 56 to the DSD device 2. For example, when the DSD data stored in the HDD 19 is reproduced, the DSD data is supplied from the ΔΣ modulator 56.

  The recording control unit 52 stores the DSD data supplied from the I / O 51 in the HDD 19.

  The multi-bit data conversion unit 53, for example, when reproducing the DSD data, as a pre-processing of the addition / multiplication calculation processing of the DSD data read from the HDD 19, prevents the DSD data from overflowing in the calculation processing. Is converted to multi-bit data in which 1 bit of 1 sample data is replaced with 1 or -1. The multibit data obtained by the multibit data conversion unit 53 is output to the addition / multiplication unit 54.

  The addition / multiplication unit 54 performs cross-fade processing by addition / multiplication or volume adjustment processing by multiplication on the data supplied from the multi-bit data conversion unit 53 as necessary, and obtains the obtained data ( Multi-bit data) is output to the LPF 55.

  The LPF 55 removes the high frequency component and outputs the obtained data to the ΔΣ modulator 56. Here, the reason why the high frequency component is removed by the LPF 55 is that the DSD data includes a lot of quantization noise due to the noise shaping effect of ΔΣ modulation, and the quantization noise is accumulated by repeating the calculation. This is because, when such DSD data is reproduced as it is, there is a risk of destroying hardware such as tweeter.

  The ΔΣ modulator 56 obtains 64 fs / 1 bit DSD data by performing ΔΣ modulation on the data supplied from the LPF 55, and outputs the obtained DSD data to the I / O 51. The quantization noise separated from the original signal by the noise shaping effect of ΔΣ modulation and formed in the high frequency component is removed by the LPF 74 of the DSD device 2. The DSD data obtained by the ΔΣ modulator 56 is also supplied to the LPF 57.

  The LPF 57 converts the DSD data supplied from the I / O 51 during recording or the DSD data supplied from the ΔΣ modulator 56 during playback into PCM data, and outputs the obtained PCM data to the meter display control unit 58. To do. PCM data obtained by the LPF 57 becomes PCM data for meter display.

  Note that the conversion by the LPF 57 uses conversion that has a small number of taps and that can be easily performed, that is, rough conversion. That is, since it is only necessary to obtain waveform information for displaying the volume, a quantization accuracy of about 1 fs / 16 bit similar to that recorded on a general music CD is not required. The PCM data obtained by the LPF 57 is data with low quantization accuracy such as 1 fs / 5 bits.

  As a result, it is possible to prevent the personal computer 1 from being loaded to display the meter.

  The meter display control unit 58 calculates the volume of the original audio signal based on the PCM data supplied from the LPF 57 and causes the display unit 17 to display the calculated volume on the meter.

  The ΔΣ modulator 71 of the DSD device 2 performs ΔΣ modulation on an analog audio signal supplied from an external device (not shown), and outputs the obtained 64 fs / 1-bit DSD data to the buffer 72. Note that the DSD device 2 has a direct monitoring function, and the analog audio signal input to the DSD device 2 (ΔΣ modulator 71) is also supplied to the output side and monitored without delay.

  The buffer 72 buffers the 64 fs / 1 bit DSD data supplied from the ΔΣ modulator 71, and outputs the DSD data including blocks as shown in FIG. 6A to the I / O 51 of the personal computer 1.

  The buffer 73 buffers the DSD data supplied from the I / O 51 of the personal computer 1, and outputs 1 sample of 64 fs / 1 bit DSD data to the LPF 74.

  The LPF 74 removes the quantization noise accumulated in the high band of the 64 fs / 1 bit DSD data supplied from the buffer 73 and outputs the analog audio signal obtained by analogization to an external device such as a speaker. .

  Next, the operation of the personal computer 1 having the above configuration will be described.

  First, processing of the personal computer 1 for recording DSD data will be described with reference to the flowchart of FIG.

  This process is performed, for example, when the audio data processing application 31 is executed with the DSD device 2 connected to the personal computer 1 and an analog audio signal is input to the DSD device 2. When an analog audio signal is input to the DSD device 2, the DSD device 2 generates DSD data by performing ΔΣ modulation by the ΔΣ modulator 71, and the generated DSD data is output to the personal computer 1. .

  In step S <b> 1, the recording control unit 52 receives DSD data supplied from the DSD device 2 via the I / O 51 and stores it in the HDD 19. The DSD data from the I / O 51 is also supplied to the LPF 57.

  In step S <b> 2, the LPF 57 performs rough conversion on the DSD data supplied from the I / O 51, and outputs PCM data such as 1 fs / 5 bits obtained by the rough conversion to the meter display control unit 58.

  In step S <b> 3, the meter display control unit 58 displays the volume based on the PCM data supplied from the LPF 57.

  In step S4, it is determined whether or not the recording is finished, and the process returns to step S1 until the recording is finished, and the subsequent processing is repeated. If it is determined that the recording is finished, the process is terminated.

  Through the above processing, the user can do so while watching the sound volume when recording the DSD data as in the case of recording the PCM data.

  Next, processing of the personal computer 1 that reproduces DSD data stored in the HDD 19 will be described with reference to the flowchart of FIG.

  In step S11, reproduction is started. Specifically, 64 fs / 1 bit of DSD data stored in the HDD 19 is converted into multi-bit data by the multi-bit data conversion unit 53, and the multi-bit data obtained by the conversion is added by the addition / multiplication unit 54. Crossfade processing and volume adjustment processing are performed. Further, the high frequency component of the data obtained by the processing by the addition multiplier 54 is removed by the LPF 55, and ΔΣ modulation is performed by the ΔΣ modulator 56 on the data that has passed through the LPF 55. The DSD data generated by the ΔΣ modulation is transmitted to the DSD device 2 by the I / O 51 and is output by the DSD device 2.

  At this time, the DSD data obtained by the ΔΣ modulator 56 is also supplied to the LPF 57.

  The processing after step S12 is basically the same as the processing after step S2 in FIG. That is, in step S 12, the LPF 57 roughly converts the DSD data supplied from the ΔΣ modulator 56 into PCM data, and outputs the obtained PCM data to the meter display control unit 58.

  In step S <b> 13, the meter display control unit 58 displays the volume on the meter based on the PCM data supplied from the LPF 57.

  In step S14, it is determined whether or not the reproduction has ended. If it is determined that the reproduction has ended, the process ends.

  With the above processing, the user can do so while watching the sound volume when reproducing the DSD data, similarly to when reproducing the PCM data.

  Next, another process performed based on waveform information included in PCM data obtained by converting DSD data will be described. Here, a case where automatic recording of DSD data is performed will be mainly described.

  FIG. 9 is a block diagram illustrating another functional configuration example of the personal computer 1. The configuration of FIG. 9 is the same as the configuration of FIG. 5 except that the output of the LPF 57 is supplied not only to the meter display control unit 58 but also to the recording control unit 52. The overlapping description will be omitted as appropriate.

  9 converts DSD data supplied from the I / O 51 during recording into PCM data, and outputs the PCM data obtained by the conversion to the recording control unit 52 and the meter display control unit 58. In the meter display control unit 58, as described above, volume meter display is performed based on the PCM data supplied from the LPF 57.

  Based on the PCM data supplied from the LPF 57, the recording control unit 52 is a volume of DSD data captured by the DSD device 2 (DSD data captured by the DSD device 2 and supplied to the recording control unit 52). When the sound volume is determined to be equal to or higher than a predetermined threshold, recording is started. That is, recording is automatically started when a song starts without recording DSD data or the like in a silent section before the song starts without almost detecting the volume.

  FIG. 10 is a block diagram illustrating a configuration example of the recording control unit 52 of FIG.

  When the volume determination unit 81 determines whether the volume of the DSD data supplied to the control unit 82 is equal to or higher than the threshold based on the PCM data supplied from the LPF 57, and determines that the volume is higher than the threshold This is notified to the control unit 82.

  When the volume determination unit 81 notifies that the DSD data supplied from the I / O 51 is DSD data having a volume equal to or higher than the threshold, the control unit 82 starts recording the DSD data.

  Here, the processing of the personal computer 1 that performs automatic recording will be described with reference to the flowchart of FIG.

  This processing is also performed, for example, when the audio data processing application 31 is executed with the DSD device 2 connected to the personal computer 1 and an analog audio signal is input to the DSD device 2. When an analog audio signal is input to the DSD device 2, the DSD device 2 generates DSD data by performing ΔΣ modulation by the ΔΣ modulator 71, and the generated DSD data is output to the personal computer 1. .

  In step S21, the LPF 57 roughly converts the DSD data supplied from the DSD device 2 via the I / O 51, and outputs the PCM data obtained by the rough conversion to the recording control unit 52 and the meter display control unit 58. To do. The conversion by the LPF 57 is repeated every time DSD data is supplied from the I / O 51, and the PCM data obtained by the LPF 57 is repeatedly supplied to the recording control unit 52 and the meter display control unit 58.

  In step S22, the volume determination unit 81 of the recording control unit 52 determines whether or not the DSD data supplied to the control unit 82 has a volume equal to or higher than the threshold, and determines that the volume is not higher than the threshold. Returning to step S21, the subsequent processing is performed.

  On the other hand, when the volume determination unit 81 of the recording control unit 52 determines in step S22 that the DSD data supplied to the control unit 82 has a volume equal to or higher than the threshold value, the volume determination unit 81 notifies the control unit 82 of the determination. Proceeding to S23, recording is started.

  In step S <b> 24, the meter display control unit 58 displays the volume on the meter based on the PCM data supplied from the LPF 57.

  In step S25, the volume determination unit 81 determines whether or not the DSD data supplied to the control unit 82 has a volume that is equal to or higher than the threshold value. If it is determined that the volume is equal to or higher than the threshold value, the process returns to step S23. The control unit 82 continues recording. If it is determined in step S25 that the DSD data supplied to the control unit 82 is not at or above the threshold, the volume determination unit 81 causes the control unit 82 to finish recording and terminate the process.

  Thereby, the recording start and the recording end of the DSD data are performed regardless of the user operation.

  In the above description, when the volume below the threshold is detected after the recording is started, the recording is ended there, but the recording is continued, and the position where the volume below the threshold is detected. May be recognized as a break of music. Information representing the break of the music recognized in this way is supplied to the HDD 19 and stored together with the DSD data.

  In the above, the case where audio data for meter display generated from DSD data is PCM data has been described. For example, ATRAC (Adaptive Transform Acoustic Coding) 3, MP3 (MPEG Audio Layer-3), WMA ( In the case of audio data having waveform information, such as Windows (registered trademark) Media Audio), data compressed in a predetermined format may be used as data for meter display.

  The series of processes described above can be executed by hardware, but can also be executed by software.

  When a series of processing is executed by software, a program constituting the software may execute various functions by installing a computer incorporated in dedicated hardware or various programs. For example, it is installed from a network or a recording medium into a general-purpose personal computer or the like.

  As shown in FIG. 4, the recording medium is distributed to provide a program to the user separately from the apparatus main body, and includes a magnetic disk (including a flexible disk) on which the program is recorded, an optical disk (CD- ROM (Compact Disk-Read Only Memory), DVD (including Digital Versatile Disk)), magneto-optical disk (including MD (registered trademark) (Mini-Disk)), or removable media 23 made of semiconductor memory, etc. In addition, the program is provided with a ROM 12 and a HDD 19 that are provided to the user in a state of being pre-installed in the apparatus main body and in which a program is recorded.

  In the present specification, each step includes not only processing performed in time series according to the described order but also processing executed in parallel or individually, although not necessarily performed in time series.

  Further, in this specification, the system represents the entire apparatus constituted by a plurality of apparatuses.

It is a figure which shows the example of sampling of PCM data and DSD data. It is a figure which shows the structural example of the recording / reproducing system to which this invention is applied. It is a figure which shows the example of the meter display of a volume. FIG. 3 is a block diagram illustrating a configuration example of the personal computer in FIG. 2. It is a block diagram which shows the function structural example of a personal computer. It is a figure which shows the example of the unit of transmission / reception of DSD data and PCM data. It is a flowchart explaining the recording process of a personal computer. It is a flowchart explaining the reproduction | regeneration processing of a personal computer. And FIG. 16 is a block diagram illustrating another functional configuration example of a personal computer. It is a block diagram which shows the structural example of the recording control part of FIG. It is a flowchart explaining the other recording processing of a personal computer.

Explanation of symbols

  1 Personal computer, 2 DSD device, 3 USB cable, 52 Recording control unit, 57 LPF, 58 Meter display control unit, 81 Volume judgment unit, 82 Control unit

Claims (6)

When recording or playing back DSD (Direct Stream Digital) data, conversion means for roughly converting the DSD data to be recorded or played back into audio data of another encoding method having waveform information of the original audio signal;
An information processing apparatus comprising: processing means for performing processing based on the waveform information based on the audio data obtained by the rough conversion by the conversion means. The information processing apparatus according to claim 1, wherein the processing unit displays a volume of the DSD data as a process based on the waveform information when recording or reproducing the DSD data. The processing means starts recording the DSD data when a volume greater than a predetermined threshold is detected as the processing based on the waveform information when recording the DSD data. Information processing device to the description. The processing means, as a process based on the waveform information when recording the DSD data, determines a position of the detected DSD data as a break of the music when a volume below a predetermined threshold is detected. The information processing apparatus according to claim 1. When recording or playing back DSD (Direct Stream Digital) data, the conversion step of roughly converting the DSD data to be recorded or played back into audio data of another encoding method having waveform information of the original audio signal;
A processing step of performing a process based on the waveform information based on the audio data obtained by the coarse conversion by the process of the conversion step. When recording or playing back DSD (Direct Stream Digital) data, the conversion step of roughly converting the DSD data to be recorded or played back into audio data of another encoding method having waveform information of the original audio signal;
A program that causes a computer to execute a process including a process step of performing a process based on the waveform information based on the audio data obtained by the coarse conversion by the process of the conversion step.

Images