JP2008084359A - Audio reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reproducing device randomly reproducing data other than duplicate audio data without requiring any large-capacity ROM or RAM for a random reproducing function. <P>SOLUTION: This device is provided with a reproducing means for reproducing audio files recorded in a recording medium, a selection means for selecting one of the audio files recorded in the recording medium, and a determination means for determining whether to reproduce the audio file based on the last reproducing time of the audio file selected by the selection means. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a playback device that plays back an audio file recorded on a recording medium.

  A reproduction apparatus that reproduces audio data recorded on a recording medium has a random reproduction function that reproduces audio data in a random order. In a conventional playback device, audio data to be played back is determined using a complex random number generation algorithm so that the same audio data is not played back repeatedly during random playback (for example, Patent Document 1). reference).

  Alternatively, in the conventional playback device, when performing random playback, the control unit manages the presence / absence of playback for each audio data recorded on the recording medium using a flag or the like, and the audio data determined by the random number generation algorithm is not played back The audio data is reproduced.

JP 10-149609 A

  A reproducing apparatus that determines audio data to be randomly reproduced using a complex random number generation algorithm needs to include a ROM (Read Only Memory) having a relatively large capacity in order to store the algorithm. The manufacturing cost of Also, a playback device that manages the presence / absence of playback for each audio data recorded on a recording medium needs to include a RAM (Random Accesses Memory) for managing the presence / absence of playback for each audio data.

  In recent years, there are playback devices such as portable players equipped with a recording medium having a large recording capacity of HD (Hard Disk) and semiconductor memory. Since a playback device including such a recording medium can record a compressed audio file such as MP3 (MPEG Audio Layer-3), it can store more audio files than a recording medium such as a CD (Compact Disc). It becomes possible to record. Therefore, as the number of audio files recorded on the recording medium increases, the capacity of the RAM for managing the presence / absence of reproduction must be increased, and the manufacturing cost of the reproduction apparatus increases.

  The present invention has been made to solve the above-described problems, and can randomly reproduce duplicate audio data without reproducing a large capacity ROM or RAM for a random reproduction function. A playback device that can be used is provided.

  In order to solve the above-mentioned problem, the invention according to claim 1 of the present application is directed to reproducing means for reproducing an audio file recorded on a recording medium, and one audio file among the audio files recorded on the recording medium. And selecting means for determining whether to reproduce the audio file based on the time when the audio file selected by the selecting means was reproduced last time.

  The invention according to claim 2 of the present application is the audio playback apparatus according to claim 1, wherein the clock means for managing time information and the random playback for instructing the random playback of the audio file recorded on the recording medium are provided. When the random reproduction is started by the random reproduction instruction unit, the determination unit obtains the time when the random reproduction is started from the clock unit, and the audio file selected by the selection unit is reproduced last time. When the recorded time is before the time when random playback is started, the audio file is determined to be played back.

  ADVANTAGE OF THE INVENTION According to this invention, even if it does not have ROM and RAM with large capacity | capacitance for a random reproduction function, the reproduction | regeneration apparatus which can reproduce | regenerate randomly so that the audio data which overlapped may not be reproduced can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of an audio playback apparatus according to an embodiment of the present invention. As shown in FIG. 1, the audio playback apparatus 1 of this embodiment includes an HD 2, an HD control unit 3, a DSP (Digital Signal Processor) 4, a DAC (Digital to Analog Converter) 5, an amplification unit 6, an output unit 7, a random A playback instruction unit 8, a display unit 9, a control unit 10, a determination unit 11, and a clock unit 12 are provided. In this embodiment, the HD is described as a recording medium, but a semiconductor memory may be used as the recording medium.

  An audio playback device 1 shown in FIG. 1 is a playback device such as a portable player with a built-in HD 2. The HD 2 is recorded with a file of compressed audio data (for example, MP3) transferred from a personal computer or the like (not shown) and file information for each audio file. The HD 2 reproduces audio data and file information under the control of the HD control unit 3. The reproduced audio data is input to the DSP 3, and the reproduced file information is input to the control unit 10. The HD control unit 3 performs control to reproduce audio data and file information from the HD 2 and control to record audio data and file information on the HD 2. The file information includes, for example, information such as the date and time of the last reproduction, the file creation date and time, and the file name.

  The DSP 4 performs signal processing such as decoding on the audio data reproduced from the HD 2. The signal-processed audio data is input to the DAC 5. The DAC 5 converts the input audio data into an analog audio signal and outputs the analog audio signal to the amplification unit 6. The analog audio signal converted by the DAC 5 is amplified by the amplification unit 6 and output from the output unit 7.

  The random playback instruction unit 8 includes an operation button for instructing random playback for randomly playing back audio data recorded on the HD2. The random playback instruction unit 8 is provided in an operation unit (not shown) that operates the audio playback device 1. The display unit 9 displays the operation state of the audio playback device 1 and the playback state of audio data under the control of the control unit 10.

  The control unit 10 controls the HD control unit 3 and the DSP 4 and controls the audio playback device 1 in an integrated manner. The control unit 10 includes a determination unit 11 and a clock unit 12. When the random reproduction is performed according to the instruction from the random reproduction instruction unit 8, the determination unit 11 reproduces the file information that is reproduced from the HD 2 and input to the control unit 8 via the HD control unit 3. Whether or not the audio data of the file information is to be reproduced is determined based on the date and time information that was previously reproduced. The clock unit 12 manages date information indicating the current date and time information indicating the time.

FIG. 2 is a flowchart for explaining the operation of determining an audio file to be played during random playback in the audio playback device 1 of the present embodiment.
When there is an operation to start random playback from the random playback instruction unit 8 (step S1), the control unit 10 acquires time information of the current time from the clock unit 12, and sets the acquired time information as a predetermined time. The data is stored in a storage unit (not shown) (step S2). In this embodiment, the predetermined time is the time when random reproduction is started.

  Then, the control unit 10 selects one audio file from the audio files recorded on the HD 2 (step S3). For example, the control unit 10 generates a random number for the number of audio files recorded on the HD 2 and selects an audio file corresponding to the generated random number. Here, a simple algorithm is used for random number generation, but an algorithm that can generate a random number without affecting the random numbers generated so far is desirable.

  When the audio file is selected, the control unit 10 acquires file information of the audio file from the HD 2 (Step S4). The control unit 10 controls the HD control unit 3 to reproduce the file information of the selected audio file from the HD 2. The HD control unit 3 performs control to reproduce the file information of the audio file selected in step S3 from the HD2. File information reproduced from the HD 2 is input to the control unit 10 via the HD control unit 3.

  The determination unit 11 reproduces the audio file selected in step S3 based on the predetermined time stored in step S2, that is, the time when random reproduction is started and the file information acquired in step S4. Is determined (step S5). When the time when the selected audio file was last played is a time before the time when random playback was started from the date and time information played last time included in the file information, the determination unit 11 selects the selected audio file. Judge to play.

  When the determination unit 11 determines to reproduce the audio file selected in step S3 (Yes in step S5), the control unit 8 controls the HD control unit 3 to reproduce the audio file from the HD 2 (step S6). . On the other hand, the determination unit 11 plays back the selected audio file when the previous playback time is later than the time when the random playback is started, that is, after the selected audio file starts random playback. If it is a selected audio file, it is determined not to play the selected audio file. If the determination unit 11 determines not to reproduce the audio file selected in step S3 (No in step S5), the audio file is selected in step S3.

  When the selected audio file is reproduced, the control unit 10 updates the file information of this audio file (step S7). The control unit 10 controls the HD control unit 3 to record the file information in which the time of the previously reproduced date / time information included in the file information is updated to the time of the current reproduction on the HD 2. The control unit 10 determines whether or not there is an operation to end random playback from the random playback instruction unit 8 (step S8), and when there is an operation to end random playback, performs control to end random playback.

  As described above, the audio reproduction device 1 according to the present embodiment refers to the file information of the selected audio file, compares the time when the audio file was reproduced last time with the time when the random reproduction was started, and performs random reproduction. Determine the audio file. Therefore, since the audio file reproduced after starting the random reproduction is not reproduced, the audio reproducing apparatus 1 of the present embodiment does not reproduce the audio file redundantly during the random reproduction. Also, the audio playback apparatus 1 of the present embodiment, like the conventional playback apparatus, determines the audio data to be played back using a complex random number generation algorithm and manages the playback presence / absence for each audio data recorded on the recording medium. Therefore, there is no need to provide a large capacity ROM or RAM.

  Next, another embodiment at the time of random playback of the audio playback device 1 will be described. In another embodiment, the determination unit 11 sets the date as the date to start random playback and sets the time to 0:00 as the date and time to be compared with the date and time information of the audio file selected in step S3 shown in FIG. .

  For example, when random playback is started at 18:30 on September 12, the determination unit 11 compares the date and time information of the audio file selected in step S3 with 0:00 on September 12. Then, when the date and time information of the audio file selected in step S3 is before 0:00 on September 12, it is determined to play back the selected audio file. Thus, by determining the audio file to be played back by the determination unit 11, the audio playback device 1 can play back only the audio file that has not been played back on the day when the user starts random playback.

  In addition, the determination unit 11 sets the date as one week before starting random playback and sets the time to 0:00 as the date and time to be compared with the date and time information of the audio file selected in step S3. The playback apparatus 1 can randomly play back only audio files that have not been played back in the week before the day when the user starts random playback. In this way, the audio playback device 1 can play back only audio files that have not been played back for a certain period of time by changing the date and time compared with the date and time information of the audio file selected in step S3.

1 is a block diagram showing the configuration of an audio playback apparatus that is an embodiment of the present invention. The flowchart explaining the operation | movement which determines the audio file reproduced | regenerated at the time of random reproduction | regeneration.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Audio reproducing apparatus of a present Example, 2 ... HD, 3 ... HD control part, 4 ... DSP, 5 ... DAC, 6 ... Amplifying part, 7 ... Output part, 8 ... Random reproduction instruction | indication part, 9 ... Display part, DESCRIPTION OF SYMBOLS 10 ... Control part, 11 ... Determination part, 12 ... Clock part

Claims (2)

Playback means for playing back an audio file recorded on a recording medium;
Selecting means for selecting one audio file from among the audio files recorded on the recording medium;
An audio reproduction apparatus comprising: a determination unit that determines whether to reproduce the audio file based on a time when the audio file selected by the selection unit was reproduced last time. The audio playback device according to claim 1,
Clock means for managing time information;
Random playback instruction means for instructing random playback of audio files recorded on a recording medium,
The determination means includes
When random reproduction is started by the random reproduction instruction means, the time when random reproduction is started is obtained from the clock means,
An audio playback apparatus characterized in that, when the previously played time of the audio file selected by the selection means is a time before the time when random playback is started, the audio file is determined to be played.

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