JP2008084462A - Audio reproducing device, its control method, control program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an audio reproducing device by which data with suppressed variations in sound quality are easily selected and reproduced from audio data in several types of formats, its control method, a control program and a recording medium. <P>SOLUTION: When a trick play instruction is inputted while reproducing any of audio data in several types of formats, audio data having the format same as that of the audio data being reproduced are selected and reproduced sequentially. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an audio reproducing apparatus that reproduces audio data of a plurality of types of formats, a control method thereof, a control program, and a recording medium.

2. Description of the Related Art Conventionally, an audio playback device that plays back a song stored in a recording medium such as CDDA (Compact Disc Digital Audio: music CD) is known. This type of audio playback apparatus is provided with a function of playing a plurality of songs in a recording medium in a song order in addition to a function of playing songs in a song order (for example, Patent Document 1). reference).
JP 2000-163935 A

By the way, in recent music data (audio data), there are various formats such as an uncompressed data format such as PCM (Pulse Code Modulation) and a compressed data format such as MP3 (MPEG Audio Layer-3).
When song data of various formats of this type coexist, if they are reproduced in the conventional reproduction order, the uncompressed data and the compressed data are reproduced together and the reproduction sound quality may vary.
In order to eliminate the variation in reproduction sound quality, it is possible for the user to specify and reproduce music data with a small difference in sound quality using a program function or the like, but the selection work becomes complicated.

  The present invention has been made in view of the above-described circumstances, and an audio playback apparatus capable of easily selecting and playing back data with suppressed variations in sound quality from among audio data of a plurality of formats, and control thereof It is an object to provide a method, a control program, and a recording medium.

In order to solve the above problems, the present invention provides an operation means capable of inputting a trick play instruction for audio data in an audio reproducing apparatus capable of reproducing one or a plurality of recording media in which audio data of a plurality of types of formats are mixed, When the operation means inputs the trick play instruction during reproduction of arbitrary audio data, the reproduction means includes reproduction control means for selecting and reproducing audio data in the same format as the audio data being reproduced. .
According to the present invention, when a trick play instruction is input during reproduction of arbitrary audio data, audio data having the same format as the audio data being reproduced is selected and reproduced in order, so that the audio quality variation is easily suppressed. Data can be selected and played back.

  In the above configuration, the audio data includes uncompressed data and compressed data, and the reproduction control unit is configured to generate uncompressed data when the operation unit inputs the trick play instruction during reproduction of the audio data of the uncompressed data. It is preferable to select the audio data and play them in order. According to this configuration, only audio data of uncompressed data can be easily reproduced.

  Further, in the above configuration, when the operation means inputs the trick play instruction during reproduction of arbitrary audio data, the reproduction control means has the same format as the audio data being reproduced and has a bit rate. However, it is preferable that substantially the same audio data is selected and reproduced in order.

Further, the present invention provides a method for controlling an audio reproducing apparatus capable of reproducing one or a plurality of recording media in which audio data of a plurality of types of formats are mixed.
When an audio data trick play instruction is input during reproduction of arbitrary audio data, audio data having the same format as the audio data being reproduced is selected and reproduced in order. According to the present invention, when an audio data trick play instruction is input during reproduction of arbitrary audio data, audio data having the same format as the audio data being reproduced is selected and reproduced in order, so that variations in sound quality can be easily achieved. You can select and play back audio data that has been suppressed.

  Further, the present invention is applied to the above-described audio reproduction device and its control method, and also distributes a control program for carrying out the present invention to general users via an electric communication line. It can also be implemented in such a manner that it is stored in a computer-readable recording medium such as a CD-ROM, floppy (registered trademark) disk, or optical recording disk and distributed to general users.

  In the present invention, when an audio data trick play instruction is input during reproduction of arbitrary audio data, audio data having the same format as the audio data being reproduced is selected and reproduced in order, so that variations in sound quality are easily suppressed. Audio data can be selected and played back.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing an audio reproducing apparatus 1 according to an embodiment of the present invention. The audio reproduction device 1 is an on-vehicle audio reproduction device mounted on a vehicle such as an automobile, and is disposed in a console box located at the center of the front of the vehicle, for example, so that a driver can easily operate the vehicle. It is arranged and operates by receiving power supply from the battery of the vehicle.

The audio reproduction device 1 is roughly divided into a drive 10, a reproduction control unit 20, an amplifier 30, a speaker 40, a compression / decompression unit 50, a hard disk device 60, an operation unit 70, and a control unit 80. It has.
The drive 10 can be loaded with a disc-type recording medium such as CDDA (Compact Disc Digital Audio: music CD), reads digital music data from the loaded disc-type recording medium, and plays the read data into the reproduction control unit 20. Output to.

The reproduction control unit 20 includes a demodulation circuit, a D / A conversion circuit, and the like. Under the control of the control unit 80, the reproduction control unit 20 performs decompression processing and digital / analog conversion on digital music data output from the drive 10 and the compression / decompression unit 50. Etc., an analog audio signal is generated, and this audio signal is output to the amplifier 30. The amplifier 30 amplifies the audio signal and outputs the amplified audio signal to the speaker 40 disposed in the vehicle, and outputs the corresponding audio from the speaker 40 into the vehicle.
The reproduction control unit 20 outputs music data in an uncompressed data format (PCM format) read from the drive 10 and subjected to decompression processing to the compression / decompression unit 50 under the control of the control unit 80.

  The compression / decompression unit 50 includes an encoder that converts music data in an uncompressed data format into a plurality of formats, and a decoder that converts music data in each format into an uncompressed data format (PCM format). The compression / decompression unit 50 converts music data of uncompressed data (PCM) into music data of uncompressed data (WAVE) or music data in a compressed data format such as MP3 or WMA (Windows (registered trademark) Media Audio). It has the function to convert and the function to perform these inverse conversions.

  The hard disk device 60 functions as a large-capacity recording medium capable of storing a large number of song data. The hard disk device 60 includes various formats converted by the compression / decompression unit 50 as shown in FIG. Is stored. In this figure, the extension “wma” is song data in the WAVE format, the extension “mp3” is song data in the MP3 format, and the extension “wma” is song data in the WMA format. Instead of the hard disk device 60, another recording medium such as a nonvolatile semiconductor memory such as a flash memory may be applied.

  The operation unit 70 detects a user operation and notifies the control unit 80 of various instructions from the user, and includes a power on / off operation unit, a volume adjustment operation unit, a performance operation operation unit, and the like. In this embodiment, as a performance operator, a “play” button 75 for instructing playback, a “stop” button 76 for instructing stop, and instructing fast forward playback and rewind playback in addition to song forward and backward A “send” button 77 for performing music selection, a “select” button 78 for designating music selection (for example, a button for designating a song number), and trick play such as random play, repeat play, intro play, etc. different from normal play are instructed. And a “trick play” button 79.

The control unit 80 functions as a computer that controls the entire sound reproduction apparatus 1 and includes a CPU, a ROM, a RAM, and the like. The sound reproduction apparatus 1 is executed when the CPU executes a control program stored in the ROM. Control each part.
Specifically, the control unit 80 reproduces a plurality of types of song data stored in the CDDA loaded in the drive 10 or the hard disk device 60 based on a user instruction input via the operation unit 70. Take control. Further, the control unit 80 reads music data from the CDDA loaded in the drive 10 based on a user instruction input via the operation unit 70, and converts the music data into a format specified by the user by the compression / decompression unit 50. Recording control is performed so that the music data is converted and stored in the hard disk device 60. That is, music data of a plurality of formats are mixedly stored in the hard disk device 60 by this recording control.

  The ROM of the present embodiment stores a control program for controlling the playback order of songs. When playing back CDDA loaded in the drive 10, the song data stored in the hard disk device 60 is stored. When playing back, the CPU executes this control program to control the playback order of songs.

Next, music reproduction control will be described. FIG. 3 is a flowchart showing this control. Here, a case where the music data in the hard disk device 60 is reproduced will be described as an example, but the case where CDDA is reproduced is substantially the same.
First, the control unit 80 selects a song to be reproduced first in accordance with a default setting (initial setting) when there is no user instruction or according to a user instruction when a user instruction is input (step S1), and a “play” button When 75 is operated and a reproduction instruction is input (step S2: YES), reproduction of the selected music data is started (step S3).

  Specifically, when there is no user instruction, the control unit 80 performs music in the default (initial setting) music order (eg, music number order set based on the recording order, etc.) as shown in FIG. Play data in order. On the other hand, when the user operates the “select” button 78 to designate a song number, the control unit 80 plays the song data corresponding to the song number, and then the next song data in the default song order. Are played in order.

  Here, when reproducing the music data in the hard disk device 60, the compression / decompression unit 50 switches the decoding process except for the uncompressed data based on the extension of the music data and converts it into a digital audio signal of a common format. Is output. The digital audio signal is converted into an analog audio signal by the reproduction control unit 20 and output to the amplifier 30, so that the sound is reported from the speaker 40 with a predetermined sound volume. When reproducing CDDA song data, the compression / decompression unit 50 performs decompression processing and outputs a digital audio signal to the amplifier 30, whereby the corresponding sound is output from the speaker 40.

  Next, when the “feed” button 77 is operated and a feed instruction is input (step S4: YES), the control unit 80 performs fast-forward playback processing or rewind playback processing, song feed processing, or A music return process is performed (step S5). For example, when the “feed” button 77 is pressed for a long time during music playback, the control unit 80 performs fast-forward playback processing or rewind playback processing according to the feed instruction, and the “feed” button 77 is pressed for a short time. When only the operation is performed, the music advance processing or music return processing is performed according to the feed instruction.

  When the “stop” button 76 is operated to input a stop instruction (step S6: YES), the control unit 80 stops the reproduction of the music (step S7). Further, when the “trick play” button 79 is operated to input a trick play instruction (step S8: YES), reproduction control (trick play) is performed in which music data having the same format as the music data being reproduced is selected and reproduced in order. Start (step S9). When none of the buttons 75 to 79 is operated, the processes of steps S1 to S9 are sequentially executed in a cyclic manner. When any other operation is operated, the operation corresponding to the operation is performed. Move to processing flow.

  That is, when only the “play” button 75 is operated, as shown in FIG. 2 (B), it operates in a normal playback mode in which music data is played back in a general music order, and thus, in the hard disk device 60. In the case where music data of a plurality of types of formats exist together, music data of various formats are sequentially reproduced. On the other hand, when the “play” button 75 and the “trick play” button 79 are operated in order, as will be described in detail below, a transition is made to a trick play mode in which the playback order of the song data is different from the default order.

Next, trick play reproduction control will be described in detail. FIG. 4 is a flowchart showing this control.
When the “trick play” button 79 is operated to input a trick play instruction, the control unit 80 shifts to the trick play mode, and first stores information indicating the format of the currently reproduced song data in the RAM (step S10). ). Subsequently, the control unit 80 waits until the reproduction of the music data is completed (step S12). When the reproduction is completed, the same format is obtained from the music data in the hard disk device 60 based on the information indicating the format stored in the RAM. Music data is extracted (step S13), and the extracted music data is sequentially reproduced in a predetermined order (step S14).

Specifically, when a trick play instruction is input during reproduction of WAVE format music data, the control unit 80, as shown in FIG. 2 (C), uses the WAVE from music data of a plurality of types of formats in the hard disk device 60. The music data in the format is extracted to create a reproduction list, and only the music data in the WAVE format is reproduced in order according to the reproduction list.
On the other hand, when a trick play instruction is input during the reproduction of MP3 format music data, the control unit 80, as shown in FIG. 2 (D), reads MP3 format music from multiple types of music data in the hard disk device 60. Data is extracted to create a play list, and only MP3 format music data is played in order according to the play list.

Note that the playback order in this case may be the order of the song numbers assigned in advance to each piece of music data, the order of the names of the song data, or may be set randomly, and how the playback order is set. Can be set arbitrarily.
Alternatively, the music data of the same format may be selected and reproduced from the music data in the hard disk device 60 each time the music data for one music is finished without creating a reproduction list. In this case, after the song data is reproduced, information indicating that the song data has been reproduced is stored in a RAM or the like so that the reproduced song data is not selected again and reproduced. Is preferred.

  If the “feed” button 77 is operated during this trick play and a feed instruction is input (step S15: YES), the control unit 80 performs fast forward playback processing or rewind playback processing, or between song data of the same format. A music feed process or music return process is performed (step S16). For example, when the “feed” button 77 is pressed for a long time, the control unit 80 performs a fast-forward reproduction process or a rewind reproduction process according to a feed instruction, and the “feed” button 77 is operated for a short time. At that time, the music feed process or music return process is performed in accordance with the feed instruction.

  When the “stop” button 76 is operated to input a stop instruction (step S17: YES), the control unit 80 stops the reproduction of the music (step S18). When the reproduction of the song is stopped by trick play, the control unit 80 returns the process to step S1 to shift to the normal reproduction mode for reproducing the song in the default song order, while the “stop” button 76 is not operated. While the reproduction of the music continues, the trick play mode is maintained and the process of sequentially reproducing the music data of the same format is repeated. This is the trick play playback control.

As described above, according to the present embodiment, the “trick play” button 79 for trick play instruction is provided, and when a trick play instruction is input during reproduction of arbitrary song data, Since music data of the same format is automatically selected and played in order, for example, a high-quality music song can be played simply by operating the “trick play” button 79 during playback of high-quality music data such as uncompressed data. Only song data in the same format as the data can be played.
Further, when the user operates the “trick play” button 79 during the reproduction of relatively low sound quality music data, only music data having the same format as that music data is reproduced, so that variations in sound quality are suppressed. Can be played.
Accordingly, even when music data of a plurality of types of formats are mixed in the hard disk device 60, the user can easily reproduce a plurality of music data in the order of reproduction with suppressed variations in sound quality.

In this embodiment, when the trick play mode is entered, when the “stop” button 76 is operated, the music is stopped and the normal playback mode is entered. Therefore, a special operation for entering the normal playback mode is performed. It is possible to play the music data of various formats immediately without any need. Therefore, if the user operates the “trick play” button 79 again when the music data in the desired format is played back during the music playback in the normal playback mode, only the music data group in the same or different format as the previous time is operated. Playback can be started easily.
That is, the audio reproducing apparatus 1 of the present embodiment selects and reproduces music data of the same format with a significantly smaller number of operations than when music data of the same format is selected using the program function. Is possible.

In addition, this invention is not limited to the above-mentioned embodiment, The deformation | transformation in the range which can achieve the objective of this invention, improvement, etc. are included in this invention. For example, in the above-described embodiment, the case where song data in the WAVE format, MP3 format, and WMA format are mixed has been described as an example. It is.
Further, in the above embodiment, when the music data of a plurality of types stored in the hard disk device 60 is reproduced, the case where only the music data of the same format is selected and reproduced is described. When music data of a plurality of types of formats is mixed on a plurality of recording media such as a hard disk device, the present invention can be widely applied to the case where only music data of the same format is selected and reproduced.

  In the above embodiment, a case has been described in which, when a trick play instruction is input, song data having the same format as the song data being played is selected and played in order. However, the present invention is not limited thereto, and is the same as the song data being played. It is also possible to select music data having the same format and the same bit rate (= music data sampling rate) or reproducing them in order. According to this configuration, music data having substantially the same beat rate that greatly affects the sound quality is selected and reproduced, so that it is possible to further suppress variations in sound quality between music data.

In the above embodiment, the case where the present invention is applied when music data is reproduced has been described. However, the present invention is not limited to music data, and the main point is when reproducing a plurality of audio data in which a plurality of formats are mixed. Widely applicable.
Furthermore, in the above-described embodiment, the case where the present invention is applied to the in-vehicle audio reproduction device 1 has been described. Widely applicable to playback devices.

  In the above embodiment, a case has been described in which a control program for controlling the reproduction order of songs is stored in the ROM in advance. However, the present invention is not limited to this, and the control program may be stored in a magnetic recording medium, an optical recording medium, or a semiconductor recording. It may be stored in a computer-readable recording medium such as a medium, and the computer may read the control program from the recording medium and execute it. The control program may be downloaded from a distribution server on the communication network.

It is a block diagram which shows the audio | voice reproduction apparatus which concerns on embodiment of this invention. (A) is a diagram showing a plurality of song data stored in the hard disk device, (B) is a diagram showing an example of the playback order in the normal playback mode, and (C) and (D) are playback in trick mode. It is a figure which shows an example of order. It is a flowchart which shows music reproduction control. It is a flowchart which shows reproduction | regeneration control of trick play.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Audio | voice reproduction apparatus 10 Drive 20 Playback control part 30 Amplifier 40 Speaker 50 Compression / decompression part 60 Hard disk apparatus (recording medium)
70 Operation part (operation means)
79 “Trick Play” Button 80 Control Unit

Claims (6)

In an audio reproducing apparatus capable of reproducing one or a plurality of recording media in which audio data of a plurality of types of formats are mixed,
Operation means capable of inputting trick play instructions for audio data;
When the operation means inputs the trick play instruction during playback of arbitrary audio data, the playback control means for selecting and playing back audio data in the same format as the audio data being played back. Audio playback device. The audio playback device according to claim 1,
The audio data includes uncompressed data and compressed data,
The playback control means, when the operation means inputs the trick play instruction during playback of audio data of uncompressed data, selects audio data of uncompressed data and plays back in order. The sound reproducing device according to claim 1 or 2,
When the operation means inputs the trick play instruction during the reproduction of arbitrary audio data, the reproduction control means outputs the audio data having the same format as the audio data being reproduced and having substantially the same bit rate. An audio playback device that is selected and played in order. In a control method of an audio reproducing apparatus capable of reproducing one or a plurality of recording media in which audio data of a plurality of types of formats are mixed,
A control method for an audio reproducing apparatus, wherein when an audio data trick play instruction is input during reproduction of arbitrary audio data, audio data having the same format as the audio data being reproduced is selected and reproduced in order. In a control program for controlling a sound reproducing apparatus capable of reproducing one or a plurality of recording media in which audio data of a plurality of types of formats are mixed, by a computer,
A control program for selecting and playing back audio data in the same format as the audio data being reproduced when an audio data trick play instruction is input to the computer during reproduction of arbitrary audio data. In a computer-readable recording medium recorded with a control program for controlling an audio reproducing apparatus capable of reproducing one or a plurality of recording media in which audio data of a plurality of types of formats are mixed,
Recording medium recording a control program for selecting and playing back audio data in the same format as the audio data being reproduced when an audio data trick play instruction is input to the computer during reproduction of arbitrary audio data .

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