JP2007265497A - Voice data reproducing unit and voice data reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a voice data reproducing unit and voice data reproducing method which can adjust sound volume properly even when reproducing musical data which has not been listened yet. <P>SOLUTION: Sound volume alteration information in which level correction value is set depending on formats is stored in a sound volume alteration information storing section 19. A decoder 12 discriminates the format while a controlling section 20 acquires the level correction value by retrieving the sound volume alteration information based on the discriminated format and corrects the set level for adjusting the sound volume with the acquired level correction value. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an audio data reproducing apparatus and audio data reproducing method for reproducing audio data, and in particular, formats (audio compression) such as AAC (Advanced Audio Coding), MP3 (MPEG Audio Layer-3), and AC3 (Audio Code number 3). The present invention relates to an audio data reproducing apparatus and audio data reproducing method for reproducing audio data compressed in a format.

  In an audio data reproducing apparatus that reads and reproduces a large amount of music data stored in a large-capacity storage medium such as an HDD or a flash memory, the volume at the time of reproducing the music data is stored, and the same music data is stored again. A technique has been proposed in which playback is performed at a stored volume when playback is performed (see, for example, Patent Document 1).

However, in the prior art, since it is necessary to store the volume of the music data that has been listened to, when reproducing music data that has never been listened to, the volume cannot be adjusted to an appropriate level. there were.
JP 2003-7038 A

  The present invention has been made in view of such problems, and an object of the present invention is to reproduce audio data that can be adjusted to an appropriate volume even when reproducing music data that has never been listened to. It is in providing an apparatus and a sound data reproducing method.

In order to solve the above problems, the present invention has the following configuration.
The audio data reproducing apparatus of the present invention is an audio data reproducing apparatus for reproducing audio data compressed into a predetermined format, and includes a volume adjusting means for adjusting the volume to a set setting level, and a level corresponding to the format Volume level change information storage means storing volume level change information for which correction values are set, format discrimination means for discriminating the format of the audio data, and the format discriminated by the format discrimination means Volume level control means for acquiring the level correction value by searching the volume level change information stored in the volume level change information storage means and correcting the set level by the acquired level correction value; It is characterized by comprising.

  Further, in the audio data reproducing device of the present invention, the volume level change information is set with the level correction value according to the format and the number of channels of the audio data, and the format determining means The volume control means determines the volume level change information stored in the volume level change information storage means based on the format and the number of channels determined by the format determination means. The level correction value is obtained by searching.

  Further, in the audio data reproduction device of the present invention, when the volume level is changed during reproduction, the volume control unit is configured to adjust the level correction value of the volume level change information according to the changed volume level. Is updated.

  The audio data reproduction method of the present invention is an audio data reproduction method for reproducing audio data compressed into a predetermined format, and stores volume level change information in which a level correction value corresponding to the format is set. In addition, the format of the audio data is determined, the volume level change information is searched based on the determined format, the level correction value is acquired, and the volume is adjusted by the acquired level correction value. The setting level to be corrected is corrected.

  Furthermore, in the audio data reproduction method of the present invention, the level correction value corresponding to the format and the number of channels of the audio data is set in the volume level change information, and the format and the number of channels of the audio data are set. The level correction value is obtained by searching the volume level change information based on the determined format and the number of channels.

  Furthermore, in the audio data reproduction method of the present invention, when the volume level is changed during reproduction, the level correction value of the volume level change information is updated according to the changed volume level. And

  The audio data reproduction apparatus and audio data reproduction method of the present invention store volume level change information in which a level correction value corresponding to a format is set, and search for the volume level change information based on the determined format. Therefore, it is possible to adjust to the appropriate volume for each different format by acquiring the level correction value and correcting the setting level for adjusting the volume according to the acquired level correction value. Even when music data that has not been played is reproduced, there is an effect that the volume can be adjusted to an appropriate level.

  Furthermore, in the audio data reproducing apparatus and audio data reproducing method of the present invention, a level correction value corresponding to the format of audio data and the number of channels is set in the volume level change information, and the volume is determined based on the determined format and number of channels. By searching the level change information, the level correction value is acquired, and the volume level is adjusted according to the acquired level correction value, and the setting level is adjusted to adjust to the appropriate volume for each different format and number of channels. Therefore, even when music data that has never been listened to is reproduced, the sound volume can be adjusted to an appropriate volume.

  Furthermore, in the audio data reproducing apparatus and audio data reproducing method of the present invention, when the volume level is changed during reproduction, the level correction value of the volume level change information is updated according to the changed volume level. By configuring, it is possible to easily adjust the volume according to the user's preference for each different format.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of an embodiment of an audio data reproducing device according to the present invention, and FIG. 2 shows correspondence between a volume level that can be set by the operation unit shown in FIG. FIG. 3 is a diagram showing an example of volume level change information stored in the volume level change information storage unit shown in FIG.

  The audio data reproduction apparatus according to the present embodiment converts audio data compressed in a format (audio compression format) such as AAC (Advanced Audio Coding), MP3 (MPEG Audio Layer-3), or AC3 (Audio Code number 3). An audio data reproducing device for reproducing, an audio data input unit 11, a decoder unit 12, a sound field processing unit 13, a volume volume 14, a D / A conversion unit 15, a speaker 16, an operation unit 17, A display unit 18, a volume level change information storage unit 19, and a control unit 20 are provided.

  The audio data input unit 11 receives audio data input from a data reading device (not shown) that reads audio data recorded on a storage medium such as a CD, DVD, or flash memory, or a network such as the Internet, and receives the received audio data. The data is output to the decoder unit 12.

  The decoder unit 12 has a function of expanding audio data compressed in a format such as AAC (Advanced Audio Coding), MP3 (MPEG Audio Layer-3), AC3 (Audio Code number 3), and the like. The data format and the number of channels are discriminated, and the audio data is expanded based on the discriminated format and outputted to the sound field processing unit 13, and the discriminated format and the number of channels are outputted to the control unit 20.

  The sound field processing unit 13 is a sound field processing unit that performs sound field processing such as equalizer processing for finely adjusting the reproduction of audio data by raising or lowering the volume within a specific frequency range. The sound field processing based on the instruction is performed, and the sound data subjected to the sound field processing is output to the volume volume 14.

  The volume volume 14 is volume adjustment means such as a digital attenuator that adjusts the audio data to the volume level instructed by the control unit 20, and the audio data whose volume has been adjusted by the volume volume 14 is the D / A conversion unit 15. Is converted into an analog signal and output from the speaker 16 as sound.

  The operation unit 17 is an input unit including operation keys for receiving various inputs related to reproduction of audio data, and performs volume level change input for changing the volume level. As shown in FIG. 2, the volume level can be set in the range of 0 to 40. When the volume level is increased by one step, the set level of the volume volume 14 is increased by 1 dB. When the volume level is lowered by one step, the setting level of the volume volume 14 is lowered by 1 dB.

  The display unit 18 is a display unit such as a liquid crystal display, and displays various input guidance information received by the operation unit 17, a set volume level, and various types of audio data to be reproduced.

  The volume level change information storage unit 19 is a storage means such as a flash memory in which data is not erased even when the power is turned off, and the volume level change in which a volume level correction value is set according to the format of audio data and the number of channels. Information is stored. As shown in FIG. 3, the volume level change information of the present embodiment is a volume corresponding to the format (A, B, C) and the number of channels (1ch, 2ch, 4ch, 5.1ch, 6.1ch). It is assumed that the level correction values are set respectively.

  The control unit 20 is a control unit that performs various controls of the audio data reproduction device, and the volume level change information stored in the volume level change information storage unit 19 based on the format and the number of channels input from the decoder unit 12. To obtain the level correction value, control the volume volume 14 based on the acquired level correction value, and based on the volume level change input input from the operation unit 17 during reproduction of the audio data. The volume level change information stored in the volume level change information storage unit 19 is updated.

Next, the operation of the present embodiment will be described in detail with reference to FIG. 4 and FIG.
FIG. 4 is a flowchart for explaining an automatic sound volume level adjusting operation and a sound volume level change information updating operation in the embodiment of the sound data reproducing device according to the present invention, and FIG. 5 is a sound data reproducing device according to the present invention. It is a figure which shows the sound volume level change information example updated by the sound volume level change information update operation | movement in this embodiment.

  When input for selecting audio data to be reproduced and starting reproduction is performed from the operation unit 17, the control unit 20 instructs the audio data input unit 11 to input audio data, and the audio data input unit 11 is not illustrated. The audio data input from the data reading device or the network is received (step A1), and the received audio data is output to the decoder unit 12. In the present embodiment, a case where the audio data input from the audio data input unit 11 is format B and the number of channels is 2ch will be described.

  The decoder unit 12 discriminates the format and channel number of the input audio data (step A2), expands the audio data based on the discriminated format and outputs the decompressed audio data to the sound field processing unit 13, and the discriminated format and channel. The number (format B and 2ch) is output to the control unit 20.

  The control unit 20 to which the format and the number of channels are input from the decoder unit 12 searches the volume level change information stored in the volume level change information storage unit 19 based on the format and the number of channels (format B and 2ch). (Step A3), it is determined whether or not the level correction value is set, that is, whether or not it is a value other than 0 dB (Step A4). If the level correction value is set, it is set. Get the level correction value. In the present embodiment, the volume level change information is searched based on the format B and the number of channels: 2ch, and the level correction value: −3 dB is acquired.

  Next, the control unit 20 instructs the sound field processing unit 13 to perform a sound field process that is set in advance or set by an input from the operation unit 17, and obtains a level correction that acquires the current setting level of the volume volume 14. A volume level automatic adjustment process to be changed based on the value is performed (step A5). For example, when the setting level of the volume 14 is set to -17 dB (volume level: 23), the setting level is changed to -3 dB and changed to -20 dB (volume level: 20).

  As a result, the sound data expanded by the decoder unit 12 is subjected to sound field processing by the sound field processing unit 13, and then the sound volume is adjusted by the sound volume volume 14 to the set level changed based on the level correction value. The D / A converter 15 converts the signal into an analog signal and outputs the sound from the speaker 16 (step A6).

  When the level correction value is not set in step A4, that is, when the level correction value is 0 dB, the audio data expanded by the decoder unit 12 is subjected to the sound field processing by the sound field processing unit 13. Without performing the volume level automatic adjustment processing, the volume is adjusted to the set current setting level with the volume volume 14, converted into an analog signal by the D / A conversion unit 15, and output from the speaker 16. (Step A6)

  When the sound output from the speaker 16 is started, the control unit 20 monitors the volume level change input from the operation unit 17 (step A7), and ends the reproduction based on the input from the operation unit 17 or the data end of the audio data. (Step A8), and when the end of reproduction is detected, the reproduction processing of the audio data is terminated.

  When the volume level change input is detected in step A7, the control unit 20 updates the level correction value of the volume level change information based on the volume level changed by the volume level change input (step A8). For example, when the volume level is increased by five steps from 20 to 25 by the volume level change input, the level correction value corresponding to the format B and the number of channels: 2ch: −3 dB is increased by 5 dB as shown in FIG. Update to 2 dB.

  As described above, according to the present embodiment, the sound volume level change information storage unit 19 stores the sound volume level change information in which the level correction value corresponding to the format is set, and the decoder unit 12 formats the format. The control unit 20 is configured to obtain the level correction value by searching the volume level change information based on the determined format, and to correct the setting level for adjusting the volume based on the acquired level correction value. By doing so, it is possible to adjust the volume to an appropriate level for each different format, so that it is possible to adjust the volume to an appropriate level even when playing music data that has never been listened to.

  Furthermore, according to the present embodiment, the level correction value corresponding to the format of audio data and the number of channels is set in the volume level change information, and the control unit 20 determines the volume based on the determined format and the number of channels. By searching the level change information, the level correction value is acquired, and the volume level is adjusted according to the acquired level correction value, and the setting level is adjusted to adjust to the appropriate volume for each different format and number of channels. Therefore, even when music data that has never been listened to is reproduced, the sound volume can be adjusted to an appropriate volume.

  Furthermore, according to the present embodiment, when the volume level is changed during reproduction, the control unit 20 is configured to update the level correction value of the volume level change information according to the changed volume level. By doing so, it is possible to easily adjust the volume according to the user's preference for each different format.

  It should be noted that the present invention is not limited to the above-described embodiments, and it is obvious that each embodiment can be appropriately changed within the scope of the technical idea of the present invention. In addition, the number, position, shape, and the like of the constituent members are not limited to the above-described embodiment, and can be set to a suitable number, position, shape, and the like in practicing the present invention. In each figure, the same numerals are given to the same component.

It is a block diagram which shows the structure of embodiment of the audio | voice data reproduction apparatus which concerns on this invention. It is a figure which shows a response | compatibility with the volume level which can be set with the operation part shown in FIG. 1, and the setting level of a volume volume. FIG. 3 is a diagram illustrating an example of volume level change information stored in the volume level change information storage unit illustrated in FIG. 1. It is a flowchart for demonstrating volume level automatic adjustment operation | movement and volume level change information update operation | movement in embodiment of the audio | voice data reproduction apparatus which concerns on this invention. It is a figure which shows the sound volume level change information example updated by the sound volume level change information update operation in embodiment of the audio | voice data reproduction apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Audio | voice data input part 12 Decoder part 13 Sound field processing part 14 Volume volume (volume adjustment means)
15 D / A conversion unit 16 Speaker 17 Operation unit 18 Display unit 19 Volume level change information storage unit 20 Control unit (volume volume control means)

Claims (6)

An audio data reproduction device for reproducing audio data compressed into a predetermined format,
Volume adjustment means for adjusting the volume to a set level,
Volume level change information storage means for storing volume level change information in which level correction values according to the format are set;
Format discriminating means for discriminating the format of the audio data;
The level correction value is acquired by searching the volume level change information stored in the volume level change information storage unit based on the format determined by the format determination unit, and the acquired level correction value And a sound volume control means for correcting the set level. In the volume level change information, the level correction value according to the format and the number of channels of the audio data is set,
The format determining means determines the number of channels of the audio data,
The volume control means searches the volume level change information stored in the volume level change information storage means based on the format determined by the format determination means and the number of channels, thereby the level correction value. The audio data reproducing apparatus according to claim 1, wherein:   The volume control means updates the level correction value of the volume level change information according to the changed volume level when the volume level is changed during reproduction. 2. The audio data reproducing apparatus according to 2. An audio data reproduction method for reproducing audio data compressed into a predetermined format,
Volume level change information in which a level correction value according to the format is set is stored,
Determining the format of the audio data;
By retrieving the volume level change information based on the determined format, the level correction value is obtained,
A method for reproducing audio data, wherein a setting level for adjusting a volume is corrected by the acquired level correction value. The level correction value corresponding to the format and the number of channels of the audio data is set in the volume level change information,
Determining the format of the audio data and the number of channels;
5. The audio data reproducing method according to claim 4, wherein the level correction value is obtained by searching the volume level change information based on the determined format and the number of channels.   6. The audio data reproduction according to claim 4, wherein when the volume level is changed during reproduction, the level correction value of the volume level change information is updated according to the changed volume level. Method.

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