JP2009223927A - Digital data reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform ripping of an arbitrary plurality of sections of an input signal so as to be able to reproduce continuously. <P>SOLUTION: A digital data reproducing device is provided with a reproducing part reproducing an input digital signal, and an encoding part housing encoding data obtained by encoding the digital signal in a memory, the encoding part stops temporarily generation of the encoding data in accordance with a temporary stop signal indicating temporary stop of encoding, and restarts generation of encoding data generated before temporary stop and generation of the encoding data so as to be able to reproduce continuously in accordance with a restart signal indicating restart of encoding. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a digital data reproducing apparatus.

Audio or video digital data stored on a recording medium such as a CD (Compact Disc) is converted into an MP3 (MPEG Audio Layer-3) format, etc., and a portable player or the like via a USB (Universal Serial Bus) or the like Transfer to external memory is performed. In this way, encoding such as compression for transferring digital data to an external memory is called ripping. In addition to digital data stored in a recording medium such as a CD, ripping of an analog signal output from a radio tuner or an analog signal input from the outside via a connection terminal may be performed (for example, Patent Document 1).
JP 2007-133955 A

  For example, when an MP3 format file is generated by ripping an analog signal output from a tuner while listening to a radio broadcast, an unnecessary part such as a commercial message (CM) may not be included in the ripping target. In such a case, for example, ripping is stopped when CM starts, and ripping is resumed when CM ends. Therefore, for example, an MP3 format file generated by ripping is a separate file before and after the CM. Therefore, when playing back on a portable player or the like, if a user does not operate to play back a plurality of files in the order in which they were generated, the necessary portions cannot be played back continuously without interruption.

  The present invention has been made in view of the above problems, and an object thereof is to rip an arbitrary plurality of sections of an input signal so that they can be continuously reproduced.

  In order to achieve the above object, a digital data reproducing device of the present invention includes a reproducing unit that reproduces an input digital signal, an encoding unit that stores encoded data obtained by encoding the digital signal in a memory, And the encoding unit temporarily stops generation of the encoded data in response to a pause signal instructing to stop encoding, and in response to a restart signal instructing restart of encoding, The generation of the encoded data is resumed so as to be continuously reproducible with the encoded data generated before the pause.

  Any plurality of sections of the input signal can be ripped so as to be continuously reproducible.

  FIG. 1 is a diagram showing a configuration of a digital data reproducing apparatus according to an embodiment of the present invention. The digital data reproducing apparatus 10 includes a DSP (Digital Signal Processor) 20, a system microcomputer 22, and a USB (Universal Serial Bus) microcomputer 24.

  Under the control of the system microcomputer 22, the DSP 20 rotates a CD standard recording medium 30 with a spindle motor 31 and reads PCM (Pulse Code Modulation) format digital data (PCM data) with a laser output from a pickup 32. The read PCM data is reproduced and sound is output from the speaker 34. Further, the DSP 20 selects an analog signal output from a radio broadcast tuner 35 or an analog signal output from an external input terminal (AUX) 36 by a selector 37 and then, for example, an ADC (Analog to Digital Converter) 38. It is converted into PCM data and input. The DSP 20 reproduces the PCM data input from the ADC 38 and outputs sound from the speaker 34. Further, the DSP 20 generates encoded data (MP3 data) obtained by encoding the PCM data from the recording medium 30, the tuner 35, and the external input terminal 36 into the MP3 format based on the control of the system microcomputer 22. (Synchronous Dynamic Random Access Memory) 40 Then, the DSP 20 sequentially outputs the MP3 data stored in the SDRAM 40 to the USB microcomputer 24. Note that digital data stored in a recording medium or digital data input from a tuner or the like is converted into a format so as to be transferred to an external memory such as a portable player. In the present embodiment, the process of converting PCM data from the recording medium 30, the tuner 35, and the external input terminal 36 into MP3 data is ripping.

  The system microcomputer 22 receives instructions from the user such as reproduction of PCM data stored in the recording medium 30, tuning of the tuner 35, selection of input sources, execution of ripping, etc., and responds to the instructions with the DSP 20 and the like. Send and receive data. For example, when controlling the DSP 20, the system microcomputer 22 sets various information in the control register 60 via the register I / F 62. In addition, the system microcomputer 22 can output various types of information associated with PCM data reproduction, ripping, and the like to the display 41. For example, in the case of reproducing a certain music piece, reproduction instruction data specifying the track number of the music piece is transmitted to the DSP 20. Then, control data relating to reproduction time and the like is transmitted from the DSP 20 to the system microcomputer 22, and information obtained from the control data is displayed on the display 41. Further, for example, in the case of ripping while reproducing PCM data from the tuner 35, the ripping instruction data is transmitted to the DSP 20 together with the reproduction instruction data of the PCM data output from the ADC 38.

  The USB microcomputer 24 is a processing circuit for transferring data output from the DSP 20 to a USB device 42 such as a portable music player having a memory connected via a USB connector or the like. For example, MP3 data generated by ripping is sequentially output to the USB microcomputer 24 at a speed according to the specifications of the USB microcomputer 24 and the USB device 42 and transferred to the USB device 42.

  In the present embodiment, the recording medium 30 is a CD standard. However, the standard of the recording medium 30 is not limited to a CD, and for example, ripping digital data such as a DVD (Digital Versatile Disk) is stored. If it is, The digital data to be ripped is not limited to PCM data, and the data generated by ripping is not limited to MP3 data. For example, digital data in the MPEG format may be generated by ripping digital data in the DVD-Video format. Also, the standard for transferring digital data generated by ripping to an external portable music player or the like is not limited to USB.

  A detailed configuration of the DSP 20 will be described. The DSP 20 includes a servo circuit 50, a CD-DA (Compact Disk Digital Audio) processing circuit 52, a DAC (Digital to Analog Converter) 54, an MP3 encoder 56, an external transfer circuit 58, a control register 60, and a register I / F (Interface). 62 is comprised.

  The servo circuit 50 adjusts the reading speed of the PCM data stored in the recording medium 30 by controlling the spindle motor 31. Further, the servo circuit 50 controls the pickup 32 so that the laser output from the pickup 32 is irradiated to an appropriate position.

  When reproducing the PCM data stored in the recording medium 30, the CD-DA processing circuit 52 (reproducing unit) is stored in the recording medium 30 based on the information set in the control register 60. The control data for reading the PCM data is output to the servo circuit 50. Then, the CD-DA processing circuit 52 converts an RF (Radio Frequency) signal output from the pickup 32 into a digital signal and generates PCM data. When analog signals are reproduced from the tuner 35 or the external input terminal 36, PCM data obtained by digitally converting the analog signals is input from the ADC 38 to the CD-DA processing circuit 52. Then, the PCM data from the recording medium 30, the tuner 35, or the external input terminal 36 is converted into an analog signal by the DAC 54 and output from the speaker 34 as sound. Further, PCM data from the recording medium 30, the tuner 35, or the external input terminal 36 is also output to the MP3 encoder 56. Further, the CD-DA processing circuit 52 outputs control data for performing focus control and tracking control of the pickup 32 to the servo circuit 50 based on the RF signal from the pickup 32.

  The MP3 encoder 56 (encoding unit) generates MP3 data by encoding (compressing) the PCM data output from the CD-DA processing circuit 52 when ripping instruction information is set in the control register 60. And stored in the SDRAM 40. The MP3 encoder 56 includes an encode buffer 70 (data storage area), a processing unit 72 (encoding processing unit), and a control unit 74 (storage control unit). The encode buffer 70 stores PCM data output from the CD-DA processing circuit 52, and the processing unit 72 converts the PCM data stored in the encode buffer 70 into MP3 data and stores it in the SDRAM 40. Further, when the information (temporary stop signal) instructing the suspension of ripping is set in the control register 60, the processing unit 72 temporarily stops the generation of MP3 data and instructs the control register 60 to resume ripping. When (restart signal) is set, the generation of MP3 data is restarted. The processing unit 72 generates MP3 data generated before and after the pause as one MP3 format file (MP3 file) that can be continuously played back. Note that the MP3 file is composed of MP3 data in a frame format, and is a minimum unit for reproduction (selection) in a portable player or the like. When information (temporary stop signal) for instructing temporary stop of ripping is set in the control register 60, the control unit 74 temporarily stops storing PCM data in the encode buffer 70 and resumes ripping in the control register 60. When the instructing information (restart signal) is set, storage of PCM data in the encode buffer 70 is resumed.

  The external transfer circuit 58 reads the MP3 data stored in the SDRAM 40 based on information such as the transfer start address of MP3 data and the number of transfer bytes set in the control register 60 and outputs the MP3 data to the USB microcomputer 24. The MP3 data output to the USB microcomputer 24 is transferred to a USB device 42 such as a portable player.

  As described above, the digital data reproducing apparatus 10 can perform ripping while reproducing PCM data from the recording medium 30, the tuner 35, and the external input terminal 36, and can transfer the MP3 data generated by the ripping to the USB device 42. it can. The digital data reproducing apparatus 10 has a ripping pause function, and cuts unnecessary parts such as CMs based on user operations when ripping PCM data from the tuner 35, for example. One MP3 file can be generated.

  FIG. 2 is a flowchart showing an example of ripping pause processing executed when ripping is performed while PCM data is being reproduced. For example, assume that the system microcomputer 22 detects a ripping pause instruction from the user while ripping PCM data obtained by digitally converting an analog signal from the tuner 35 (S101). The system microcomputer 22 sets information (temporary stop signal) instructing the temporary stop of ripping in the MP3 encoder 56 in the control register 60 (S102). The MP3 encoder 56 suspends the supply of the PCM data output from the CD-DA processing circuit 52 to the encode buffer 70 when information for instructing the suspension of ripping is set in the control register 60 (S103). One frame of MP3 data is generated and ripping is temporarily stopped (S104). In other words, the MP3 encoder 56 pauses ripping at the frame delimiter, not during the creation of the MP3 data frame.

  While ripping is paused, the system microcomputer 22 waits for a ripping restart instruction from the user (S105: NO). When a restart instruction is detected (S105: YES), the system microcomputer 22 sets information (restart signal) instructing restart of ripping in the MP3 encoder 56 in the control register 60 (S106). When the information instructing resumption of ripping is set in the control register 60, the MP3 encoder 56 clears the encode buffer 70 (S107), and resumes the supply of PCM data to the encode buffer 70 (S108). Then, the MP3 encoder 56 resumes generating a new frame of MP3 data from the PCM data sequentially stored in the encode buffer 70 (S109). That is, the MP3 encoder 56 resumes the generation of the MP3 data frame so that it can be continuously reproduced with the MP3 data frame generated before the pause. In other words, the MP3 encoder 56 does not divide the MP3 file before and after the pause, but generates MP3 data before and after the pause as one MP3 file.

  Thus, in the digital data reproducing apparatus 10, when ripping while reproducing PCM data, the MP3 data generated before and after the ripping pause is generated as one MP3 file that can be continuously reproduced. That is, the digital data reproducing apparatus 10 can rip arbitrary plural sections of PCM data as an input signal so as to be continuously reproduced. Therefore, for example, when playing back on a portable player or the like, by selecting and playing back one generated MP3 file, it is possible to listen to the sound of only the necessary parts excluding unnecessary parts such as CMs. .

  Further, in the digital data reproducing apparatus 10, since ripping is paused at frame breaks, when ripping is resumed, generation may be started from a new frame without considering the state before the pause. Therefore, normal MP3 data can be generated without outputting incomplete MP3 data during frame creation. Further, it is not necessary to perform complicated control such as saving the information of the frame being generated before the suspension and restarting the creation of the frame before the suspension after the restart.

  Further, in the digital data reproducing apparatus 10, when the ripping is resumed, the encoding buffer 70 is cleared, and then the PCM data is stored in the encoding buffer 70 again. Therefore, it is possible to prevent unprocessed ripped data remaining in the encode buffer 70 when ripping is temporarily stopped from being a ripping target when ripping is resumed. That is, unnecessary PCM data can be prevented from being ripped when ripping is resumed.

  In addition, the said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

It is a figure which shows the structure of the digital data reproducing | regenerating apparatus which is one Embodiment of this invention. It is a flowchart which shows an example of the ripping temporary stop process performed when ripping is performed, reproducing | regenerating PCM data.

Explanation of symbols

10 Digital data playback device 20 DSP
22 system microcomputer 24 USB microcomputer 30 recording medium 31 spindle motor 32 pickup 34 speaker 35 tuner 36 external input terminal 37 selector 38 ADC
40 SDRAM
41 Display 42 USB Device 50 Servo Circuit 52 CD-DA Processing Circuit 54 DAC
56 MP3 encoder 58 External transfer circuit 60 Control register 62 Register I / F

Claims (3)

A playback unit for playing back an input digital signal;
An encoding unit for storing encoded data obtained by encoding the digital signal in a memory;
With
The encoding unit includes:
In response to a pause signal for instructing a pause in encoding, generation of the encoded data is temporarily stopped, and in response to a restart signal instructing a restart of encoding, the code generated before the pause Resuming the generation of the encoded data so that it can be continuously reproduced with the encoded data;
A digital data reproducing apparatus characterized by the above. The digital data reproducing apparatus according to claim 1,
The encoding unit includes:
In response to the pause signal, the generation of the encoded data is paused at a frame delimiter constituting the encoded data, and the encoded data frame generated before the pause is generated in response to the resume signal. Resuming the generation of the encoded data frame so that it can be continuously reproduced;
A digital data reproducing apparatus characterized by the above. The digital data reproducing apparatus according to claim 1 or 2,
The encoding unit includes:
A data storage area in which the digital data to be encoded is stored;
An encoding processor that encodes the digital data stored in the data storage area to generate the encoded data;
In response to the pause signal, temporarily stopping storage of the digital data in the data storage area, and in response to the restart signal, after clearing the digital data stored in the data storage area, A storage control unit that resumes storing the digital data in the data storage area;
A digital data reproducing apparatus comprising:

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