JP2006065958A - Digital data reproducing device, digital data reproduction processing device, and digital data reproduction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a digital data reproducing device, a digital data reproduction processing device, and a digital data reproduction method that enable proper sound field processing to be performed while maintaining an excellent reproduction state. <P>SOLUTION: A client control section 12 adds dummy data of prescribed time length to supplied music data and outputs the resulting data to a DIR 13. The DIR 13 supplies the supplied data to an audio DSP 14, which performs decoding/demodulation and sound field processing. At this time, a system microcomputer 11 reads the format of the music data based on the dummy data added to the head of the music data, selects a proper processing method, and makes the audio DSP 14 process the music data. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a digital data reproduction apparatus, a digital data reproduction processing apparatus, and a digital data reproduction method.

Receives and decodes digital data such as CD, DVD, and other players capable of reproducing digital music content such as HDD players, as well as CD players, DVD players, and HDD players. There is an AV receiver that outputs sound (for example, Patent Document 1).
JP-A-8-256330

  The CD player, DVD player, HDD player, and AV receiver as described above support various audio formats such as CD-DA, MP3, WMA, AAC, etc., and in order to support these audio formats, It is necessary to grasp the audio format of the content and perform processing suitable for the format. For this reason, it is common practice to read audio format information at the start of content playback.

  However, since it takes a certain amount of time from the start of content playback to the completion of acquisition of audio format information, processing cannot be performed on the first part of the audio data. Will occur. For example, when a disc on which an audio signal is recorded in the MP3 format is played by a CD player, the MP3 format bit stream output from the CD player is decoded and output by an AV receiver or the like. Therefore, it takes a certain amount of time to identify the bit stream, and the initial portion of the bit stream cannot be reproduced. Even when the CD player decodes (PCM) the MP3 format audio signal and outputs it, a plurality of sampling frequencies of the MP3 format audio signal can be selected. It will take time. Accordingly, there may still be a case where the initial part of the audio signal cannot be reproduced.

  The present invention has been made in view of the above circumstances, and has a digital data reproduction device, a digital data reproduction processing device, and a digital data reproduction method that are capable of handling a plurality of audio formats and / or sampling frequencies. It aims at realizing.

In order to achieve the above object, a digital data reproducing apparatus according to the first aspect of the present invention provides:
Reproducing means for reproducing the digital data to be reproduced;
Processing means for receiving digital data reproduced by the reproducing means, determining attributes of the received digital data, and outputting digital data corresponding to the received digital data;
Attribute determination digital data generating means for generating attribute determination digital data having the same attribute as that of the reproduction target digital data determined by the processing means, and outputting the generated attribute determination digital data for a predetermined period; ,
With
The processing means outputs the digital data corresponding to the reproduction target digital data received from the reproduction means after outputting the attribute identification digital data generated by the attribute determination digital data generation means,
It is characterized by that.

  The attribute discrimination digital data is preferably composed of silent digital data.

  The attribute preferably includes at least one of a digital data encoding method and a sampling frequency.

  When the supply of digital data is started, the processing means preferably determines at least one of an encoding method and a sampling frequency of the digital data as an attribute, and processes the supplied digital signal according to the determined attribute. .

In order to achieve the above object, a digital data reproducing apparatus according to the second aspect of the present invention provides:
An apparatus for reading out and outputting digital data to be reproduced recorded on a recording medium,
Playback instruction receiving means for receiving a playback instruction of digital data;
Attribute determination means for determining the attribute of the reproduction target digital data in response to the reception of the reproduction instruction by the reproduction instruction receiving means;
Dummy data generating means for generating dummy digital data having the attribute determined by the attribute determining means;
Output the digital data generated by the dummy generating means for a predetermined period, and then output the digital data read from the recording medium continuously with the digital data.
It is characterized by that.

  The dummy digital data is preferably composed of silent digital data.

  The digital data characteristics preferably include at least one of a digital data encoding method and a sampling frequency.

  Furthermore, it is preferable to include processing means for determining the attribute of the digital data output from the output means and processing the digital data supplied according to the determined attribute.

In order to achieve the above object, a digital data reproduction processing apparatus according to the third aspect of the present invention provides:
Receiving means for receiving digital data;
Processing means for determining an attribute of the digital data received by the receiving means and outputting digital data corresponding to the received digital data;
Attribute determination digital data generating means for generating attribute determination digital data having the same attribute as that of the reproduction target digital data determined by the processing means, and outputting the generated attribute determination digital data for a predetermined period; ,
Reproduction processing for receiving the attribute discrimination digital data generated by the attribute discrimination digital data generation means and the reproduction target digital data processed and output by the processing means, and performing reproduction processing to generate reproduction digital data Means,
With
The processing means outputs the digital data corresponding to the reproduction target digital data received from the reproduction means after outputting the attribute identification digital data generated by the attribute determination digital data generation means,
The reproduction processing means receives the attribute determination digital data to determine an attribute of the digital data, receives the reproduction target digital data, and reproduces the reproduction target digital data based on the determined attribute;
It is characterized by that.

In order to achieve the above object, a digital data reproduction method according to a fourth aspect of the present invention includes:
A method for reproducing and supplying digital data,
Determine the attributes of the digital data to be played,
After the digital data having the determined attribute is generated and supplied for a predetermined period, the supply of the digital data to be reproduced is started.
It is characterized by that.

  According to the present invention, it is possible to realize a digital data reproducing device, a digital data reproducing processing device, and a digital data reproducing method that are free from interruptions in correspondence with a plurality of audio formats and / or sampling frequencies.

(First embodiment)
As shown in FIG. 1, an AV (Audio and Visual) device 1 according to an embodiment of the present invention includes a system microcomputer 11, a client control unit 12, a DIR (Digital Interface Receiver) 13, and an audio DSP (Digital Signal). Processor) 14, amplifier unit 15, speaker unit 16, key control unit 17, PC (Personal Computer) 18, router 19, memory card 20, slot 21, LAN (Local Area Network) 22 , A LAN controller 23, a display unit 24, a display control microcomputer 25, and a LAN connection terminal 26.

  The system microcomputer 11 controls the overall operation of the AV device 1 and includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like.

  The client control unit 12 serving as a processing unit is configured by a DSP and receives digital content data (audio data, image data, etc.) supplied from the PC 18 or the memory card 20. The client control unit 12 decodes audio data of the received content data into PCM data and supplies the PCM data to the DIR 13. The decoded PCM data can have various sampling frequencies depending on the original data (MP3, WMA, etc.). The client control unit 12 discriminates an attribute, for example, an audio format such as MP3 or a sampling frequency such as 44.1 kHz from the supplied digital content data, and stores the digital data supplied corresponding to the discriminated attribute. Perform the decoding process. The decoded digital data is output to the DIR 13 as PCM data.

  Even when the supplied digital data is PCM data, the PCM data may be sampled at various sampling frequencies. The client control unit 12 identifies the sampling frequency of the supplied PCM data as an attribute, and outputs the received PCM data to the DIR 13.

  Based on the determined attribute, the client control unit 12 generates attribute determination digital data having the same attribute as the determined reproduction target digital data, and outputs the generated attribute determination digital data for a predetermined period. . The client control unit 12 also performs processing as attribute determination digital data generation means. The client control unit 12 outputs the attribute determination digital data for a predetermined period, and subsequently outputs the supplied MP3 format audio data or PCM data corresponding to the supplied PCM.

  The DIR 13 serving as a reproduction processing unit converts the PCM data supplied from the client control unit 12 into a signal format that can be processed by the audio DSP 14, and supplies the converted signal to the audio DSP 14. As described above, the PCM data received from the client control unit 12 can have various sampling frequencies depending on the original signal (MP3, WMA, etc.). The DIR 13 discriminates a sampling frequency as an attribute from the received PCM data, and performs a reproduction process corresponding to the discriminated sampling frequency.

  The audio DSP 14 performs acoustic processing (high-frequency interpolation processing and surround processing) on the content data supplied from the client control unit 12 via the DIR 13 and outputs the processed data to the amplifier unit 15.

  The amplifier unit 15 includes an analog amplifier, a DAC (Digital Analog Converter) which will be described later, and the like, converts data input from the audio DSP 14 into an analog signal by D / A conversion, and amplifies it. Then, the amplifier unit 15 extracts an audio signal from the analog amplified signal and supplies it to the speaker unit 16.

  The speaker unit 16 converts the audio signal supplied from the amplifier unit 15 into air vibration and outputs audio.

  The key control unit 17 receives a user operation input using an operation input key such as a remote controller and supplies data corresponding to the input signal to the system microcomputer 11.

  The PC 18 includes a storage device such as a hard disk device, and supplies content data stored in the storage device to the client control IC 12 via the router 19 and the LAN 22 in response to a request from the client control unit 12. The PC 18 has content data recorded in a plurality of encoding formats in the recording device. For example, digital data obtained by encoding an audio signal in MP3 format, WMA format, AAC format or the like is recorded. In response to a request from the client control unit 12, the corresponding digital data in the storage device is output as a bit stream in the recorded audio encoding format.

  The router 19 is a device for relaying data exchange between the PC 18 and the client control unit 12 via the LAN 22.

  The memory card 20 is a recording medium that incorporates a nonvolatile semiconductor memory such as a flash memory. The memory card 20 is inserted into a slot 21 connected to the client control unit 12 and supplies content data recorded therein to the client control unit 12 via the slot 21. The memory card 20 records content data encoded in various audio encoding formats as digital data, similar to the storage device in the PC 18 described above. Similar to the above, digital data obtained by encoding an audio signal in the MP3 format, WMA format, AAC format, or the like is recorded. In response to a request from the client control unit 12, in cooperation with a slot 21 described later, corresponding digital data is output as a bit stream in the recorded audio encoding format.

  The slot 21 is an insertion slot for the memory card 20 and is connected to the client control unit 12. The slot 21 reads the content data recorded on the memory card 20 and supplies it to the client control unit 12.

  The LAN 22 is composed of Ethernet (registered trademark) or the like, and mediates data exchange between the client control unit 12 and the PC 18.

  The LAN controller 23 is a network control device for mediating data exchange between the client control unit 12 and the PC 18 via the LAN 22, and is connected to the client control unit 12.

  The display unit 24 is composed of, for example, a fluorescent display tube, a liquid crystal display panel, or the like, and displays a message or the like indicating the operation status of the AV device 1 according to display data supplied from the display control microcomputer 25.

  The display control microcomputer 25 includes a CPU, a ROM, a RAM, and the like, and controls display contents displayed on the display unit 24.

  The LAN connection terminal 26 is a terminal for connecting the LAN 22 and the LAN controller 23.

  Next, the process of receiving and outputting digital data from the PC 18 in the AV device 1 having the above configuration will be described.

  The key control unit 17 detects a user's key operation. The key control unit 17 outputs a command corresponding to the key operation to the system microcomputer 11. The system microcomputer 11 determines whether the command corresponding to the key operation is an instruction to reproduce data in the PC 18, and when it is an instruction to reproduce the content in the PC 18, The reproduction of data corresponding to the PC 18 is instructed via the LAN controller 23, the LAN connection terminal 26, the LAN 22 and the router 19.

  The PC 18 starts reproduction of the corresponding data in response to the reproduction instruction input from the AV device 1, and outputs this to the LAN 22 via the router 19. At this time, the PC 18 outputs the data instructed for reproduction as a bit stream as digital data in the recorded encoding format. Further, data may be decoded based on a recorded encoding format as necessary, and output as PCM data.

  The AV device 1 receives the data output from the PC 18 via the LAN 22, the LAN connection terminal 26, and the LAN controller 23 and inputs the data to the client control unit 12. The client control unit 12 determines the attribute of the received digital data. When the digital data supplied from the PC 18 is an MP3 bit stream, the audio encoding format and the sampling frequency are determined as attributes, and the received digital data is decoded based on the determined attributes. In addition, the client control unit 12 generates attribute determination digital data based on the determined attribute. The attribute discrimination digital data is generated by using the determined attribute. In this embodiment, the sampling frequency is used among the attributes to generate data having the same sampling frequency. The audio data portion of the attribute determination digital data is silent (0 data).

  In addition, the client control unit 12 decodes the received digital data based on the determined attribute. If the received digital data is MP3 format data, decoding is performed in accordance with the MP3 format, and digital data corresponding to the received digital data (PCM data obtained by decoding MP3 in this embodiment) is output. .

  The client control unit 12 outputs the generated attribute determination digital data prior to the digital data corresponding to the received digital data. Following the output of the attribute determination digital data, the digital data (PCM data) corresponding to the received digital data is output while maintaining a state synchronized with the attribute determination digital data.

  The digital data output from the client control unit 12 is supplied to the DIR 13. The DIR 13 reproduces and outputs the received digital data (PCM data) so that the audio DSP 14 can be processed. At this time, in order for the DIR 13 to perform playback processing so that the audio DSP 14 can be processed, it is necessary to determine the attribute of the received digital data and perform playback processing based on this attribute. First, the attribute determination digital data is received from the client control unit 12. An attribute (sampling frequency) is discriminated based on the received attribute discriminating digital data. Based on the discriminated attribute, digital data including an audio signal to be subsequently received (output from the PC 18 and decoded by the client control unit 12). Digital data).

  Since the processing is executed as described above, even if the DIR 13 needs a proper time to determine the attribute, there is no interruption in the reproduction of the digital data received from the PC 18.

(Second Embodiment)
Next, a disc playback apparatus according to the second embodiment of the present invention and a receiver apparatus connected to the disc playback apparatus will be described. The disc reproducing apparatus and receiver apparatus according to the second embodiment of the present invention can be expressed as shown in FIG. In other words, the disk playback device includes a DSP 31, a control unit 32, and a drive device 33.

  The DSP 31 decodes the music data supplied from the drive device 33 into PCM data and supplies the digital data to the DSP 34 of the receiver side device. At that time, the DSP 31 determines the attribute (encoding format, sampling frequency) of the music data supplied from the drive device 33 and, according to the control of the control unit 32, the FS (file system of the music data supplied from the driver device 33). ) And the decoding process corresponding to the type of audio format.

  Further, after decoding the music data supplied from the drive device 33, the DSP 31 adds dummy data to the decoded music data (PCM music data) as shown in FIG. This dummy data obtains the format information of the music data for performing processing according to the sampling frequency or the like when the audio signal is reproduced and processed in a format that can be processed by the audio DSP 35 (DSP on the receiver side). It is for earning time. That is, by adding dummy data having a predetermined time length to the head of music data, for example, as shown in FIG. 4, acquisition of the data format of music data can be completed during reproduction of dummy data. Therefore, it is possible to reproduce music data (reproduction with sound field processing) without causing a head cut due to a data format acquisition delay as shown in FIG. 7 that occurs when there is no dummy data. The dummy data has the same attribute as the attribute of the music data supplied from the drive device 33 determined by the DSP 31. For example, when the sampling frequency of the music data supplied from the drive device 33 is 48 kHz, PCM data with a sampling frequency of 48 kHz is output as dummy data. The digital data corresponding to the music data supplied from the drive device 33, which is output following the dummy data, is output in synchronization with the dummy data.

  The control unit 32 includes a CPU, a ROM, a RAM, and the like. The control unit 32 stores a decoding processing method corresponding to each format (FS, data format) of audio data and information of dummy data to be added as a table or the like in its own internal buffer, for example. Then, the control unit 32 reads out information on the corresponding processing method and dummy data according to the attribute of the music data supplied to the DSP 31 from the drive device 33 determined by the DSP 31, and controls the DSP 31 to perform the decoding process and the dummy data. Add data.

  The drive device 33 is a reproduction drive for reproducing a disc loaded in the drive device 33, and supplies music data instructed by the control unit 32 to the DSP 31. The DSP 31 outputs the music data supplied from the drive device 33 in the supplied encoding format when the corresponding receiver device has a function of decoding the music data in the encoding format output from the drive device. You may make it do. Even in this case, music data is output following the dummy data.

  Next, the configuration of the receiver device will be described. The receiver device includes a DSP 34, a system microcomputer 36, an audio DSP 35, an amplifier unit 37, a DAC 38, and the like.

  The DSP 34 converts the music data with dummy data supplied from the DSP 31 into a signal format that can be processed by the audio DSP 35 under the control of the system microcomputer 36 and supplies the signal format to the audio DSP 35. That is, the DSP 34 determines the attribute of the music data supplied from the DSP 31, and reproduces the received music data based on the determined attribute. Here, when the supplied music data is PCM data, the sampling frequency is discriminated as an attribute, and the corresponding reproduction process is performed. In the case where the supplied music data is encoded music data (MP3, WMA, AAC, etc.), the encoding format and sampling frequency are determined as attributes, and the corresponding reproduction processing is performed. The digital data supplied to the DSP 34 has dummy data added prior to the music data. Therefore, the attribute of the music data supplied using the dummy data can be determined, and the beginning of the music data is not cut off.

  The system microcomputer 36 controls the audio DSP 35 to perform necessary acoustic processing (high frequency interpolation processing and surround processing). As described above, the DSP 34 determines the attribute during the reproduction of the dummy data, so that the digital data supplied to the audio DSP 35 is supplied from the beginning of the audio data without causing a head break.

  The amplifier unit 37 includes a DAC 38. The DAC 38 D / A converts the music data supplied from the audio DSP 35 and outputs (analog output).

  Next, audio data reproduction processing operations performed by the AV apparatus 1 and the disc reproduction apparatus according to the present embodiment will be described with reference to the flowchart of FIG. The configuration in parentheses indicates the configuration of the disc reproducing apparatus according to the second embodiment.

  When the music data output from the PC 18 (drive device 33) is supplied to the client control unit 12 (DSP 31), the system microcomputer 11 (control unit 32) decodes / demodulates audio data to the client control unit 12 (DSP 31). A reproduction command for processing is supplied (step S101).

  The system microcomputer 11 instructs the audio DSP 14 to read the information of the header portion of the music data being decoded / demodulated, that is, the attribute, and acquire the data format (FS, data format, sampling frequency) information of the music data. (Step S102).

  The client control unit 12 (DSP 31) generates dummy data based on the determined attribute, and first outputs the dummy data prior to the music data (step S103).

  Following the output of dummy data, the client control unit 12 (DSP 121) outputs the decoded / demodulated music data as PCM data (step S104). Then, along with the end of the music data, the reproduction process is ended (step S105).

  Note that the AV device 1 performs a reproduction process in the DIR 13 subsequent to the above-described process. This reproduction process is an operation of converting the PCM data supplied from the client control unit 12 into a format that can be processed by the audio DSP 14, and is performed based on the sampling frequency of the supplied PCM data.

  As described above, since the DIR 13 of the AV device 1 and the DSP 34 of the receiver device receive dummy data prior to the reception of music data, preparations for playback processing based on attributes can be made before the reception of music data. . Therefore, the audio part of the music data is not cut off.

  The present invention is not limited to that shown in the above embodiment, and various modifications and applications are possible.

  For example, in the above embodiment, dummy data having a certain length is added to the head of music data. However, the length of the dummy data is not limited to one type, and may be variable according to the user's preference. This is realized, for example, when the disk reproducing apparatus includes a non-volatile memory 39 as shown in FIG. In other words, the setting relating to the output time of dummy data using a controller (not shown) by the user is accepted, and the control unit 32 of the disk reproducing apparatus stores the setting information in the memory 39. Then, the setting information designated by the user according to the state of the receiver and the state of the content is appropriately read out from the memory 39, and dummy data is added. As a result, dummy data can be added with minimal waste.

  Also, for example, the reproduction processing means for performing the reproduction processing based on the attribute of the dummy data measures the required time from the respective encoding format and sampling frequency, and notifies this to the attribute determination digital data generation means. Also good. This also makes it possible to add dummy data (attribute determination digital data) without waste.

  Furthermore, as described above, the encoded digital data may be output as it is as the digital data output by the processing means. In this case, the decoding process may be performed on the digital data receiving side.

  Also, the type of source for supplying the content is not limited to the PC 18 (HDD) or the memory card 20, but may be, for example, a DVD (Digital Versatile Disc), a CD (Compact Disc), or the like. In this case, for example, an output signal from the source is supplied to the client control IC 12 when decoding is necessary, and is supplied to the DIR 13 when decoded, and an arbitrary input is selected by the DIR 13.

1 is a configuration diagram of an AV device according to an embodiment of the present invention. It is a block diagram of the disc reproducing | regenerating apparatus and receiver apparatus which concern on 2nd Embodiment of this invention. It is a figure which shows typically a mode that dummy data is added to audio | voice data in AV apparatus and a disc reproducing | regenerating apparatus. It is a figure for demonstrating that cutting of a head can be prevented by addition of dummy data. FIG. 3 is a flowchart showing the content of reproduction processing performed by the AV device of FIG. 1 and the disk reproduction device (and receiver device) of FIG. 2. It is a figure which shows the structure of the modification of 2nd Embodiment of this invention. It is a figure for demonstrating that a head break occurs in the conventional AV apparatus.

Explanation of symbols

1 AV equipment 11 System microcomputer 12 Client control unit 13 DIR
14 Audio DSP
15 Amplifier unit 16 Speaker unit 17 Key control unit 18 PC
19 router 20 memory card 21 slot 22 LAN
23 LAN controller 24 Display unit 25 Display control microcomputer 26 LAN connection terminal 31 DSP
32 Control unit 33 Drive device 34 DSP
35 Audio DSP
36 System microcomputer 37 Amplifier section 38 DAC

Claims (10)

Reproducing means for reproducing the digital data to be reproduced;
Processing means for receiving digital data reproduced by the reproducing means, determining attributes of the received digital data, and outputting digital data corresponding to the received digital data;
Attribute determination digital data generating means for generating attribute determination digital data having the same attribute as that of the reproduction target digital data determined by the processing means, and outputting the generated attribute determination digital data for a predetermined period; ,
With
The processing means outputs the digital data corresponding to the reproduction target digital data received from the reproduction means after outputting the attribute identification digital data generated by the attribute determination digital data generation means,
A digital data reproducing apparatus characterized by the above.   2. The digital data reproducing apparatus according to claim 1, wherein the attribute discrimination digital data is composed of silent digital data.   3. The digital data reproducing apparatus according to claim 1, wherein the attribute includes at least one of a digital data encoding method and a sampling frequency.   When the supply of digital data is started, the processing means determines at least one of the encoding method and sampling frequency of the digital data as an attribute, and processes the supplied digital signal according to the determined attribute. The digital data reproducing apparatus according to claim 1, wherein the digital data reproducing apparatus is a digital data reproducing apparatus. An apparatus for reading out and outputting digital data to be reproduced recorded on a recording medium,
Playback instruction receiving means for receiving a playback instruction of digital data;
Attribute determination means for determining the attribute of the reproduction target digital data in response to the reception of the reproduction instruction by the reproduction instruction receiving means;
Dummy data generating means for generating dummy digital data having the attribute determined by the attribute determining means;
Output the digital data generated by the dummy generating means for a predetermined period, and then output the digital data read from the recording medium continuously with the digital data.
A digital data reproducing apparatus characterized by the above.   6. The digital data reproducing apparatus according to claim 5, wherein the dummy digital data is composed of silent digital data.   7. The digital data reproducing apparatus according to claim 5, wherein the characteristics of the digital data include at least one of a digital data encoding method and a sampling frequency. Furthermore, it comprises processing means for determining the attribute of the digital data output from the output means, and processing the digital data supplied according to the determined attribute,
8. The digital data reproducing apparatus according to claim 5, 6 or 7. Receiving means for receiving digital data;
Processing means for determining an attribute of the digital data received by the receiving means and outputting digital data corresponding to the received digital data;
Attribute determination digital data generating means for generating attribute determination digital data having the same attribute as that of the reproduction target digital data determined by the processing means, and outputting the generated attribute determination digital data for a predetermined period; ,
Reproduction processing for receiving the attribute discrimination digital data generated by the attribute discrimination digital data generation means and the reproduction target digital data processed and output by the processing means, and performing reproduction processing to generate reproduction digital data Means,
With
The processing means outputs the digital data corresponding to the reproduction target digital data received from the reproduction means after outputting the attribute identification digital data generated by the attribute determination digital data generation means,
The reproduction processing means receives the attribute determination digital data to determine an attribute of the digital data, receives the reproduction target digital data, and reproduces the reproduction target digital data based on the determined attribute;
A digital data reproduction processing apparatus. A method for reproducing and supplying digital data,
Determine the attributes of the digital data to be played,
After the digital data having the determined attribute is generated and supplied for a predetermined period, the supply of the digital data to be reproduced is started.
A digital data reproducing method characterized by the above.

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