JP4433954B2 - Information processing apparatus and method, and program - Google Patents

Description

  The present invention relates to an information processing apparatus and method, and a program, and in particular, what kind of music the DSD data stored in a file belongs to even if it does not have a DSD (Direct Stream Digital) device. The present invention relates to an information processing apparatus and method that allow a user to check, and a program.

  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 re-quantization is performed using the 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, at present, there are few DSD devices, which are devices capable of reproducing DSD data, prepared in personal computers.

  Therefore, for example, even when a DSD file (file storing DSD data) created by a user who performs DTM as described above is received, the DSD device is stored in the personal computer of the user who received the DSD file. Is not prepared, the user cannot confirm what kind of music the DSD data stored in the DSD file belongs to.

  The present invention has been made in view of such a situation, and even on a personal computer that does not have a DSD device, the user confirms what kind of music the DSD data stored in the file belongs to. It is something that can be done.

An information processing apparatus according to the present invention includes: a capturing unit that captures the DSD data from an optical disc in which a file storing DSD data is recorded; and the DSD data captured by the capturing unit is PCM data that is audio data in PCM format Converting means for converting the data into the PCM, and reproducing means for outputting the PCM data obtained by the conversion by the converting means to an external device connected via a cable and capable of reproducing audio data in the PCM format. And storage means for storing the DSD data captured from the optical disc, and editing means for editing the DSD data stored in the storage means, wherein the capture means includes the PCM data by the external device. Is played back and the DSD data is read from the optical disc when the user instructs the capture of the DSD data. And stored in the storage means.

The information processing method of the present invention captures the DSD data from an optical disc in which a file storing DSD data is recorded, converts the captured DSD data into PCM data which is audio data in PCM format, and obtains the converted data. The PCM data is output to an external device connected via a cable and capable of playing back audio data in PCM format and played back, and the PCM data is played back by the external device, When DSD data capture is instructed by the user, the method includes the steps of capturing the DSD data from the optical disc, storing it in the storage means, and editing the DSD data stored in the storage means.

The program of the present invention is obtained by capturing the DSD data from an optical disc in which a file storing DSD data is recorded, converting the captured DSD data into PCM data which is audio data in PCM format, and converting the DSD data. The PCM data is output to an external device connected via a cable and capable of reproducing audio data in the PCM format and reproduced, and the PCM data is reproduced by the external device, and the DSD data When the user instructs the capture, the DSD data is captured from the optical disc, stored in the storage means, and the computer is caused to execute processing including the steps of editing the DSD data stored in the storage means.

In the information processing apparatus, method, and program according to the present invention, the DSD data is captured from an optical disc on which a file storing DSD data is recorded, and the captured DSD data is PCM format audio data. Is converted to Also, the converted PCM data is output to an external device capable of reproducing PCM format audio data connected via a cable and reproduced, and the PCM data is reproduced by the external device. When the user instructs to capture the DSD data, the DSD data is captured from the optical disk, stored in the storage means, and the DSD data stored in the storage means is edited.

  According to the present invention, even in a personal computer that does not have a DSD device, the user can confirm what kind of music the DSD data stored in the file belongs to.

  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 PCM device 2 via, for example, a USB (Universal Serial Bus) cable 3.

  For example, the personal computer 1 captures DSD data (audio data encoded by the DSD method) from the optical disk 4 and stores the captured DSD data in a built-in HDD (Hard Disk Drive). The DSD data stored in the HDD is appropriately edited by the user for the data.

  Further, the personal computer 1 controls the PCM device 2 via the USB cable 3 and reproduces the PCM data (audio data encoded by the PCM method) output to the PCM device 2. As described above, in the example of FIG. 2, the personal computer 1 has a device capable of reproducing PCM data, but does not have a device capable of reproducing DSD data.

  The PCM device 2 is an audio device capable of reproducing PCM data, and is driven according to control performed by the personal computer 1 via the USB cable 3. For example, the PCM device 2 reproduces PCM data supplied from the personal computer 1 and outputs sound corresponding to an audio signal obtained by the reproduction from a speaker (not shown).

  For example, a DSD file storing DSD data generated by another personal computer (not shown) is recorded on the optical disc 4.

  In such a recording / playback system composed of each device, for example, when DSD data recorded on the optical disc 4 is captured, the DSD data to be captured is converted into PCM data by the personal computer 1, and the obtained PCM data is obtained. Are used as audio data for preview (hereinafter referred to as preview PCM data as appropriate).

  That is, since the personal computer 1 cannot reproduce the DSD data as it is, PCM data generated based on the DSD data is supplied from the personal computer 1 to the PCM device 2 as PCM data for preview, and the PCM device. According to 2, the reproduction is performed.

  As a result, even if a device capable of reproducing DSD data is not prepared in the personal computer 1, the user confirms what kind of music the DSD data to be captured and edited from now on belongs to. (Can be taken in after confirmation)

  For preview use, it is sufficient if a certain level of sound quality is ensured. Generally, since real-time performance is required rather than sound quality during preview, PCM data generated based on DSD data is The amount of data according to the hardware performance of the personal computer 1 is easy to reproduce for the personal computer 1.

  For example, when the performance of the personal computer 1 is low, PCM data with a small amount of data that can be easily reproduced is generated as preview PCM data based on the DSD data. When PCM data having a large amount of data is used as PCM data for previewing, depending on the low-performance personal computer 1, it cannot be played back easily, sound quality can be ensured, but real-time performance is impaired. .

  Here, the performance of the personal computer 1 is determined, for example, by the performance of the CPU (Central Processing Unit) of the personal computer 1 (clock frequency, cache memory capacity, etc.), memory capacity, and the like. Further, whether the amount of preview PCM data is large or small is determined based on, for example, the sampling frequency, the number of quantization bits, and the like.

  The processing of the personal computer 1 using the PCM data obtained by converting the DSD data as described above as the PCM data for preview will be described later with reference to a flowchart.

  FIG. 3 is a block diagram illustrating a configuration example of the personal computer 1 of FIG.

  The CPU 11 executes various processes according to a program stored in a ROM (Read Only Memory) 12 or a program loaded from the HDD 18 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, an HDD 18, a communication unit 19, and a USB interface 20 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).

  The HDD 18 stores various data such as DSD data in a built-in hard disk. In the example of FIG. 3, the audio data processing application 31 is also stored in the HDD 18. 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 19 performs communication processing via a network, and the USB interface 20 performs communication with the PCM device 2 via the USB cable 3. As described above, PCM data for preview generated based on DSD data is supplied from the USB interface 20 to the PCM device 2.

  A drive 21 is connected to the input / output interface 15 as necessary. The drive 21 is appropriately equipped with a removable medium 22 composed of a magnetic disk, an optical disk (including the optical disk 4 in FIG. 2), a magneto-optical disk, or a semiconductor memory, and a computer program read from the removable medium 22 is necessary. Is installed in the HDD 18 accordingly.

  In the example of FIG. 3, the DSD file 32 is recorded on the removable medium 22. For example, when the DSD data stored in the DSD file 32 is captured, preview reproduction based on the preview PCM data is performed.

  FIG. 4 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. 4 is realized by the audio data processing application 31 being executed by the CPU 11 of FIG.

  For example, when the DSD file 32 of the removable medium 22 is selected by the user as a file in which the DSD data to be captured is stored, the capturing unit 41 captures the DSD data (64 fs / 1 bit) and converts the captured DSD data into the LPF 42. Output to.

  Further, the import unit 41 stores the DSD data imported from the DSD file 32 in the HDD 18 at a predetermined timing, thereby realizing the import of the DSD data. The imported DSD data is appropriately edited by the user for that data.

  The LPF 42 adjusts the data amount by changing the number of taps of the filter used for generating the PCM data according to the evaluation result of the performance of the personal computer 1 by the evaluation unit 43, and the DSD supplied from the capture unit 41. Generate PCM data based on the data. In the example of FIG. 4, 32-bit (1 fs / 32-bit) PCM data is generated by the LPF 42, and the generated PCM data is output to the noise shaper 44. The LPF 42 may be, for example, an Intel Performance Primitive (IPP) LPF.

  The evaluation unit 43 evaluates the hardware performance of the personal computer 1 by referring to, for example, the clock frequency of the CPU 11 and the capacity of the RAM 13 and outputs the evaluation result to the LPF 42.

  The noise shaper 44 generates, for example, 16-bit PCM data from the 32-bit PCM data supplied from the LPF 42. For this conversion, for example, SBM (Super Bit Mapping) that reduces only the number of quantization bits while maintaining the sound quality of the conversion source PCM data is used. If real-time characteristics are important, SBM or the like may not be performed, and simple data thinning may be performed. The PCM data generated by the noise shaper 44 is supplied to the reproduction control unit 45 as preview PCM data.

  The reproduction control unit 45 supplies the PCM data for preview supplied from the noise shaper 44 to the PCM device 2 via the USB cable 3 to reproduce the PCM data for preview.

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

  First, processing of the personal computer 1 that imports 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 PCM device 2 connected to the personal computer 1.

  In step S1, the capturing unit 41 sets the mode of the audio data processing application 31 to the PCM mode, for example, in accordance with an operation by the user. At this time, the user can preview the DSD data by using the preview PCM data generated based on the DSD data.

  In step S2, the capturing unit 41 selects, for example, a DSD file that stores DSD data to be imported in accordance with a user operation, and proceeds to step S3 to perform a preview reproduction process. In the preview reproduction process, basically, preview PCM data is generated and reproduced. Details of the preview reproduction process performed in step S3 will be described later with reference to the flowchart of FIG.

  For example, when the preview reproduction process is performed and the user instructs to import the DSD data, the capturing unit 41 captures the DSD data from the removable medium 22 and stores the captured DSD data in the HDD 18.

  Next, the preview reproduction process performed in step S3 of FIG. 5 will be described with reference to the flowchart of FIG.

  In step S <b> 11, the evaluation unit 43 evaluates the hardware performance of the personal computer 1 and outputs the evaluation result to the LPF 42.

  In step S <b> 12, the LPF 42 is based on the DSD data supplied from the capturing unit 41 with a predetermined amount of PCM data by changing the number of taps according to the evaluation result of the performance of the personal computer 1 by the evaluation unit 43. The generated PCM data is output to the noise shaper 44. The noise shaper 44 generates preview PCM data by reducing the number of quantization bits of the PCM data supplied from the LPF 42 and outputs the generated preview PCM data to the reproduction control unit 45.

  In step S13, the reproduction control unit 45 supplies the PCM data for preview supplied from the noise shaper 44 to the PCM device 2 via the USB cable 3, and reproduces the PCM data for preview.

  Through the above processing, even if the user of the personal computer 1 does not have a device capable of reproducing DSD data in the personal computer 1, what kind of music is stored in the DSD data recorded on the removable medium 22. Can be imported and confirmed.

  In the above, the case where the audio data generated based on the DSD data is PCM data has been described. For example, ATRAC (Adaptive Transform Acoustic Coding) 3, MP3 (MPEG Audio Layer-3), WMA (Windows (registered) Data compressed in a predetermined format reproducible by the personal computer 1 such as (trademark) Media Audio) may be generated as preview data based on the DSD data.

  In the above, the generation of PCM data based on the DSD data is performed for the preview before the DSD data is imported. For example, the personal computer 1 that does not have a DSD device is used. This may be performed in order for the user to listen to the music of the DSD data.

  In this case, for example, when a DSD device capable of reproducing DSD data is prepared in the personal computer 1, the DSD data is reproduced as it is by the DSD device, and no DSD device capable of reproducing DSD data is prepared. When only a PCM device capable of reproducing PCM data is prepared, PCM data obtained by converting DSD data is reproduced by the PCM device. Thus, the user can edit the DSD data and the like using the personal computer 1 for which no DSD device is prepared while listening to the reproduction sound of the PCM data.

  As described above, the PCM data generated based on the DSD data can be used for various purposes.

  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. 3, 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 22 made of semiconductor memory, etc. In addition, it is configured by a ROM 12 on which a program is recorded, a hard disk included in the HDD 18, and the like provided to the user in a state of being incorporated in the apparatus main body in advance.

  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. 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 flowchart explaining the import process of a personal computer. 6 is a flowchart for explaining preview reproduction processing performed in step S3 of FIG. 5.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Personal computer, 2 PCM device, 3 USB cable, 4 Optical disk, 31 Audio data processing application, 41 Capture part, 42 LPF, 43 Evaluation part, 44 Noise shaper, 45 Playback control part

Claims (3)

  Capture means for capturing the DSD data from an optical disk on which a file storing DSD (Direct Stream Digital) data is recorded;
  Conversion means for converting the DSD data captured by the capture means into PCM data which is audio data in PCM format;
  The PCM data obtained by the conversion by the conversion means is output to an external device capable of playing back PCM format audio data connected via a cable, and playback means for playing back the PCM data.
  Storage means for storing the DSD data captured from the optical disc;
  Editing means for editing the DSD data stored in the storage means;
  With
  The capture means captures the DSD data from the optical disc and stores it in the storage means when the PCM data is reproduced by the external device and the capture of the DSD data is instructed by a user
  Information processing device.   DSD (Direct Stream Digital) data is stored from the optical disc on which the file is stored, DSD data,
  The captured DSD data is converted to PCM data that is audio data in PCM format.
  The PCM data obtained by conversion is output to an external device capable of playing back audio data in PCM format connected via a cable, and played back.
  When the PCM data is played back by the external device and the DSD data capture is instructed by the user, the DSD data is captured from the optical disc and stored in the storage means.
  Edit the DSD data stored in the storage means
  An information processing method including steps.   DSD (Direct Stream Digital) data is stored from the optical disc on which the file is stored, DSD data,
  The captured DSD data is converted to PCM data that is audio data in PCM format.
  The PCM data obtained by conversion is output to an external device capable of playing back audio data in PCM format connected via a cable, and played back.
  When the PCM data is played back by the external device and the DSD data capture is instructed by the user, the DSD data is captured from the optical disc and stored in the storage means.
  Edit the DSD data stored in the storage means
  A program that causes a computer to execute processing including steps.

Images