JP2005293652A - Digital audio reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital audio reproducing device with high versatility that eliminates the need to previously register data, has no limitation on the number of musical pieces, and also has its playback sound volume made uniform without altering musical piece data. <P>SOLUTION: Digital data of a 1st musical piece are read out of a storage medium 1 by a readout means 2 and temporarily stored in a temporary storage means 3. An audio data conversion means 4 decodes the data to reproduce the musical piece. During the reproduction, the readout means 2 reads a 2nd musical piece out of the storage medium 1 and supplies them to a sound volume detecting means 6, sound volume data detected there are compared with sound volume data of the 1st musical piece, and a sound volume control means 5 is controlled according to the result to reproduce the 2nd musical piece. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to automatic volume adjustment during reproduction of digital audio data.

  Generally, the volume of audio data digitally recorded on a commercially available CD or the like is not constant for each disc. In a single-type playback device that inserts one disc at a time, it is usually necessary for humans to adjust the volume at the same time because there is human intervention to start playback after changing the disc. I do not feel much. However, in a so-called changer-type disc playback device that can continuously play a large number of discs in a casing, variation in volume is often a level that cannot be ignored, and automatic volume adjustment is a very effective function.

  Today, by combining audio data compression technology and large-volume data storage technology, an environment has been established in which hundreds to thousands of songs can be stored and listened to on various storage media. However, the music data provided there is often obtained via CD ripping or the Internet, etc., but generally the playback volume varies, creating a volume difference that cannot be ignored during continuous playback, and hindering comfortable listening. ing. Therefore, the need for automatic volume adjustment is expected to increase in the future.

  Conventionally, as a means for providing such a function, for example, in the case of a disc playback device, as a first example, the volume for each disc to be played is stored in advance in a storage device attached to the device and played back. Is determined by some means and adjusted to a stored volume.

Further, as a second example, as disclosed in Patent Document 1, volume data is given in advance to data to be reproduced, and volume adjustment is performed according to the data.
JP 2000-67517 A

  In the above-described first conventional method, it is difficult to discriminate the disk and the certainty is lacking. There is a problem that registration is necessary in advance, and it becomes difficult to cope with an increase in disks.

  Further, the second conventional method is complicated because it is necessary to manipulate data in advance, and there is a problem that the data is modified for exclusive use with a certain reproducing apparatus and lacks versatility.

  The present invention eliminates the complexity of registering data in advance, does not limit the number of songs, makes any modification to the song data, makes the playback volume uniform, and has a highly versatile digital audio playback device. The purpose is to provide.

  In order to solve the above-described problems, a digital audio playback apparatus according to the present invention includes a storage medium that stores a plurality of digital audio data, a reading unit that reads digital audio data from the storage medium, and a read medium that is read from the storage medium. Temporary storage means for temporarily storing digital audio data; volume detection means for detecting the volume of digital audio data stored in the temporary storage means; and decoding and reproducing the digital audio data stored in the temporary storage means Audio data converting means, volume adjusting means for adjusting the output volume of the sound data converting means based on the detection result of the sound volume detecting means, and control means for controlling the respective units, and reading from the storage medium Read by the means and temporarily stored in the temporary storage means During the reproduction of the first music, the second music data of the storage medium is prefetched, and the sound volume detecting means detects the sound volume data from the data, and the sound volume of the first music and the second music The sound volume adjusting means adjusts the sound volume of the second music piece according to the result of comparing the data.

  The present invention is free from the complexity of registering data in advance, has no limitation on the number of music pieces, and does not add any modification to the music data, and thus has the advantage of high versatility.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a digital audio reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a control flowchart of the same. As the storage medium 1 for storing the digital audio data, for example, a hard disk, a compact disk, a DVD, a memory card of various standards, a solid memory, or the like is used. The reading means 2 is for reading data from the storage medium 1 and uses a hard disk device (hereinafter referred to as HDD), an optical deck, or the like. The temporary storage means 3 temporarily stores data so as to continue reproduction during a period of data processing as will be described later. The audio data conversion means 4 is means for decoding the digital audio data encoded and stored in the temporary storage means 3 and converting it into an audio output, and is generally composed of a digital signal processor (DSP) or the like. The volume adjusting means 5 controls the volume of analog audio output. The volume detection means 6 detects volume data from the digital audio data. The control means 7 controls the above means.

  The feature of the present invention resides in the above-described constituent elements and a control method combining them, and therefore description of other electronic circuits and mechanisms is omitted.

  The operation will be described below with reference to the flowchart of FIG. First, in step S1, the control means 7 designates the music to be reproduced first, and in step S2, the music data is read from the storage medium 1 and stored in the temporary storage means 3. In step S3, the data conversion means 4 reads the data in the temporary storage means 3, converts it into audio data, and starts reproduction.

  During the reproduction, the control means 7 detects the volume data from the audio data being reproduced only in the case of the first song during the reproduction, and sets it as the volume data A. Further, the control means 7 determines the music to be reproduced next in step S5. In general, playback may be performed in the order stored in the storage medium 1, or may be performed according to a predetermined order, such as a so-called playlist, or according to a program function of the device. Moreover, the control means 7 may select the next music at random.

  When the music to be reproduced next is determined in this way, the control means 7 gives the data of the music to be reproduced next to the volume detecting means 6 by the reading means 2 in step S6, and obtains the volume data. This is volume data B.

  When the reproduction of the first song is completed, in step S7, the control means 7 compares the volume data A and B and controls the volume adjustment means 5 so that the volume difference is reduced when the next song is reproduced. In step S8, the volume data B obtained in step S6 is replaced with volume data A, that is, the volume adjustment means 5 is set so that the next song of the volume data B is at the same level as the first song of the volume data A. Adjust and play the next song. Thereafter, similar control is repeated.

  The volume data may be detected by detecting the maximum level in the song, or as disclosed in Patent Document 1, by calculating a root mean square value (effective value) of a value equal to or higher than a specified recording level. In order to shorten the processing time, the volume data of a certain section may be detected and averaged every certain time.

  As described above, according to the present embodiment, during the reproduction of the first music read from the storage medium by the reading means and temporarily stored in the temporary storage means, the data of the second music is pre-read and the data is read. The sound volume detecting means detects the sound volume data, and the sound volume adjusting means adjusts the sound volume of the second music according to the result of comparing the sound volume data of the first music and the second music. This makes it possible to eliminate the uncomfortable feeling caused by variations in music and to enjoy music.

  The digital audio playback apparatus of the present invention enables comfortable music listening without discomfort due to variations in volume without special operation when continuously playing back a plurality of digital audio data stored in a large-capacity storage. Industrial applicability is great.

1 is a block diagram of a digital audio playback apparatus according to an embodiment of the present invention. The control flowchart

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Storage medium 2 Reading means 3 Temporary storage means 4 Audio | voice data conversion means 5 Volume adjustment means 6 Volume detection means 7 Control means

Claims (1)

A storage medium for storing a plurality of digital audio data;
Reading means for reading digital audio data from the storage medium;
Temporary storage means for temporarily storing digital audio data read from the storage medium;
Volume detection means for detecting the volume of the digital audio data stored in the temporary storage means;
Audio data conversion means for decoding and reproducing the digital audio data stored in the temporary storage means;
Volume adjustment means for adjusting the output volume of the audio data conversion means based on the detection result of the volume detection means;
Control means for controlling each of the parts,
During playback of the first music piece read from the storage medium by the reading means and temporarily stored in the temporary storage means, the second music data of the storage medium is pre-read and the volume detection is performed from the data. A digital audio reproducing apparatus characterized in that the means detects the volume data and the volume adjusting means adjusts the volume of the second music according to the result of comparing the volume data of the first music and the second music.

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