JP2012078578A - Electronic apparatus, content reproduction method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for applying a sound signal processing easy and appropriate for sound contents.SOLUTION: The electronic apparatus includes a process determining part, processing part, and output part. The process determining part captures content information from the header of sound contents and, based on the content information, determines a sound signal processing to be performed for the sound contents. The processing part performs the determined sound signal processing for the sound contents. The output part outputs the sound contents subjected to the sound signal processing.

Description

  The present invention relates to a technology for playing back audio and music content using an electronic device.

  Many small electronic devices such as mobile phones have a sound output function. For example, some small electronic devices output sound from a speaker or earpiece speaker (receiver). Some small electronic devices can output digital or analog music or audio signals from an external output terminal to external headphones or external speakers. Some small electronic devices can send music and audio signals to external headphones and external speakers by wireless communication such as Bluetooth.

  Some of these electronic devices can further adjust the sound quality according to their preference and correct the acoustic characteristics. For example, there are electronic devices that can adjust the frequency characteristics, dynamic range, and reverb of music output. As a result, the user can listen to music with sound quality and acoustic characteristics suitable for the type of sound source and the genre of music. Sound source types include voice, music, and environmental sound. Music genres include classical music, pop music and rock music. The acoustic characteristics called spatial system or modulation system such as surround, reverb, and chorus are realized by setting the compressor / limiter, equalizer, and volume, centering on the sense of spread and reverberation.

  These acoustic signal processes are applied when the user customizes according to his / her preference or selects items prepared in advance according to the sound source and music genre.

  In addition, a technique for processing music output in accordance with music content has been proposed. For example, Patent Literature 1 discloses an electronic music device that generates a harmony sound signal in accordance with a singing voice signal. This electronic music apparatus can generate a harmony sound of a type suitable for the singing type or genre. In addition, this electronic music device can give an effect to the harmony sound.

JP 2010-19922 A

  However, in the conventional electronic device, when playing back music or audio content, if the user does not set or select the sound signal processing, the sound signal processing suitable for the sound source type and music genre can be reflected in the sound output. It was not possible to force the user to perform such an operation. In particular, such a complicated operation may be forced by a GUI of a small electronic device that is not sufficiently operable.

  An object of the present invention is to provide a technique for easily applying appropriate acoustic signal processing to sound content.

In order to achieve the above object, an electronic apparatus according to the present invention includes:
A process determination unit that acquires content information from the header of the sound content and determines an acoustic signal process to be performed on the sound content based on the content information;
A processing unit for performing the determined acoustic signal processing on the sound content;
An output unit that outputs the sound content that has been subjected to the acoustic signal processing.

The content playback method of the present invention includes:
Obtaining content information from the header of the sound content, and determining an acoustic signal processing to be performed on the sound content based on the content information;
Performing the determined acoustic signal processing on the sound content;
The sound content that has been subjected to the acoustic signal processing is output.

The content reproduction program of the present invention
A procedure of acquiring content information from the header of the sound content and determining acoustic signal processing to be performed on the sound content based on the content information;
Performing the determined acoustic signal processing on the sound content;
A program for causing a computer to execute a procedure for outputting the sound content subjected to the acoustic signal processing.

  According to the present invention, it is possible to easily apply appropriate acoustic signal processing to sound content.

It is a block diagram which shows the structure of the electronic device by this embodiment. It is a block diagram which shows the structure of the electronic device by a present Example. It is a table | surface which shows the classification of a sound source type and a music genre. It is a figure for demonstrating an example of the acoustic signal process with respect to a classic. It is a figure for demonstrating an example of the acoustic signal process with respect to a lock | rock. It is a table | surface which shows the classification | category of a sound source type and a sound source type detail. It is a block diagram which shows the structure of the electronic device of a modification.

  The basic embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram illustrating the configuration of the electronic apparatus according to the present embodiment. Referring to FIG. 1, the electronic apparatus 10 according to the present embodiment includes a processing determination unit 11, a processing unit 12, and an output unit 13.

  The process determining unit 11 acquires content information indicating the audio and music attributes of the content from the header information included in the audio and music content, and based on the content information, the sound to be performed on the content Determine the signal processing and output volume of the content.

  The content information includes sound source type information for identifying a sound source type including human voice, music, and environmental sound. If the content is music content, genre information indicating a music genre is further included. It is. The acoustic signal processing is, for example, processing for adjusting frequency characteristics, dynamic range, and reverb, and is signal processing for reproducing sound with sound quality and sound suitable for a sound source and a music genre.

  The process determining unit 11 holds information in which each of the sound source type and the music genre is associated with the sound signal processing in advance, and when the content is reproduced, the sound source type indicated by the sound source type information or further the music genre is displayed. Based on this, acoustic signal processing is determined.

  The processing unit 12 performs the acoustic signal processing determined by the processing determination unit 11 on the content. The configuration of the processing unit 12 is not particularly limited. For example, the processing unit 12 is realized by a processor such as a DSP (Digital Signal Processor), a CPU (Central Processing Unit), or an FPGA (Field-Programmable Gate Array) executing predetermined processing. .

  The output unit 13 outputs the sound and music of the content subjected to the acoustic signal processing by the processing unit 12 in the output volume determined by the processing determination unit 11. Since the content of the present embodiment is digital content, the output unit 13 converts the digital signal of the content into an analog signal with a D / A (Digital to Analogue) converter, amplifies the analog signal with an amplifier, and outputs from the output terminal To do. Or the output part 13 may generate a sound from a speaker with the amplified signal.

  As described above, according to the present embodiment, content information is acquired from the header of the sound content, and the sound signal processing to be performed on the sound content is determined based on the content information. Appropriate acoustic signal processing can be applied.

  Next, specific examples of the present invention will be described.

  In this embodiment, the number of a sound source type (music, voice, environmental sound, etc.) and a music genre (rock, pops, classic, etc.) is defined in the header of audio or music content, and that number is the header area of the content Stored in

  The electronic device refers to the number and sets sound signal processing suitable for the sound source type and music genre corresponding to the number. As a result, the sound signal processing corresponding to the sound source type and the music genre can be performed on the content, so that it is possible to provide the user with the optimal viewing sound that matches the sound source and the music.

  FIG. 2 is a block diagram illustrating the configuration of the electronic apparatus according to the present embodiment. Referring to FIG. 2, the electronic device 20 includes a sound source unit 21, a processing unit 22, a processing determination unit 23, a D / A converter 24, an analog filter 25, an audio amplifier 26, an analog filter 27, a speaker 28, and an information storage unit 29. have.

  The sound source unit 21 loads and outputs sound source digital data from a recording medium such as an SD card, a flash memory, or a hard disk.

  The processing unit 22 is a processor that performs the acoustic signal processing (compressor / limiter, equalizer, surround, chorus, reverb, volume) determined by the processing determination unit 23 on the digital data from the sound source unit 21, This is realized by a system incorporated in a DSP, CPU, FPGA or the like. Each acoustic signal processing is represented as a set of parameters used for operations such as compressor / limiter, equalizer, surround, chorus, reverb, volume and the like.

  The information storage unit 29 stores information indicating sound signal processing corresponding to each number indicating sound source information and music genre. The information storage unit 29 has a configuration including a ROM memory such as a flash memory and a hard disk and a RAM memory for loading the ROM data.

  The process determination unit 23 determines the acoustic signal process corresponding to the number stored in the content header by referring to the information stored in the information storage unit 29.

  The D / A converter 24 is a D / A converter that converts digital data into analog data, and converts the digital signal output from the processing unit 22 into an analog signal. The processor and the D / A converter 24 constituting the processing unit 22 can be mounted on one LSI chip or LSI module.

  The analog filter 25 is an analog filter that filters an analog signal from the D / A converter 24, and constitutes a band-pass filter, a low-pass filter, or a high-pass filter.

  The audio amplifier 26 is an audio amplifier that amplifies the voltage, current, or power of the analog signal filtered by the analog filter 25, and is a class AB push-pull amplifier, a class D amplifier, or the like.

  The analog filter 27 is an analog filter that filters the output of the audio amplifier 26, and constitutes a bandpass filter, a lowpass filter, or a highpass filter. When the audio amplifier 26 is a digital amplifier such as a class D amplifier, the switching carrier signal component is removed by the analog filter 27.

  The speaker 28 is a speaker that outputs sound, and may be any driving system such as an electrodynamic type, an electromagnetic type, a piezoelectric type, and an electrostatic type.

  FIG. 3 is a table showing the types of sound sources and music genres. Here, the sound source type and the music genre are indicated by information of 2 bytes as an example. The upper 1 byte indicates the sound source type, and the lower 1 byte indicates the music genre.

  The sound source type is shown in the left column of the table of FIG. 3, the music genre is shown in the center column, and the number (hexadecimal value) corresponding to the sound source type and the music genre is shown in the right column.

  In this example, there are sound, music, and environmental sound as sound source types, and hexadecimal values of 01h, 02h, and 03h are given, respectively. Further, a music genre is defined for music. For example, a value of 01h is assigned to classic and a value of 0Ch is assigned to fusion. In addition, for the sound and the environmental sound, the music genre is not particularly defined, and a value of 00h is given. In the right column, 2 bytes (hexadecimal value) indicating a sound source type and a music genre are described.

  It should be noted that the audio signal processing is performed with default parameters for content to which a number that does not specify the sound source type (000h) or a number that does not specify a classification or a music genre (a number that does not appear in FIG. 3) is assigned.

  An example of setting the compressor and limiter according to the content will be described.

  FIG. 4 is a diagram for explaining an example of acoustic signal processing for a classic.

  The upper part of FIG. 4 shows compressor / limiter settings, and the lower part shows equalizer settings.

  In classic, it is preferable to ensure that only instantaneous signal peaks are limited. Therefore, in the upper part of FIG. 4, the parameters are set as Threshold = −5 dB, Ratio = ∞: 1, Attack time = 0 sec, and Release time = 0 sec.

  As for the equalizer, the band is cut because a small speaker built in an electronic device hardly reproduces sound of 500 Hz or less. Other frequency regions are set flat.

  FIG. 5 is a diagram for explaining an example of acoustic signal processing for a lock.

  As in FIG. 4, the compressor / limiter settings are shown in the upper part of FIG. 5, and the equalizer settings are shown in the lower part.

  It is preferable to apply a little deep compression in the lock. Therefore, in the upper part of FIG. 5, Threshold = −15 dB, Ratio = 4: 1, Attack time = 100 msec, and Release time = 200 msec are set.

  Further, the equalizer is set to be boosted by using a peaking type at 800 Hz and a shelving type at 3 kHz or more in addition to cutting a frequency of 500 Hz or less in the same manner as the classic.

  By setting as shown in FIGS. 4 and 5, the optimum parameters are automatically set for both classic and rock. 4 and 5 are examples in which the music genre in FIG. 3 is classic (0201h) and the music genre is rock (0204h), but in the case of other sound source types and music genres. As for, the parameters of the compressor / limiter and the equalizer can be set individually.

  In the present embodiment, an example in which only the compressor / limiter and the equalizer are set has been described, but the present invention is not limited to this. As another example, one, a plurality, or all of surround, reverb, and chorus may be individually set according to the sound source type and the music genre.

  Further, in this embodiment, the sound source type and the music genre are defined, and the music genre is not set when the sound source type is sound or environmental sound. However, the present invention is not limited to this. . As another example, the sound source type and the sound source type details indicating the detailed classification in the sound source type may be defined, the sound and the environmental sound may be classified in detail, and an appropriate effect may be set for each. FIG. 6 is a table showing the classification of sound source types and sound source type details. Referring to FIG. 6, unlike FIG. 3, the sound source type details such as male only, female only, child, and plural are set for the voice. For the environmental sound, the sound source type details such as city, office, sea, etc. are set.

  In this embodiment, only the acoustic signal processing performed by the processing unit 22 is selected according to the content. However, the present invention is not limited to this. As another example, the gain in the audio amplifier 26 may be selected according to the content.

  FIG. 7 is a block diagram illustrating a configuration of a modified electronic device. In order to select the output volume, the processing determination unit 23 of the modification of FIG. 7 determines the acoustic signal processing and the output volume for the content based on the information in the information storage unit 29, notifies the processing unit 22 of the acoustic signal processing. Is sent to the audio amplifier 26.

  The audio amplifier 26 changes the output volume in accordance with the content by switching the gain according to the gain switching instruction 71 notified from the process determining unit 23.

  Further, in the present embodiment, an example in which content music or the like is generated from the speaker 28 incorporated in the electronic device 20 is shown. However, the present invention is not limited to this. As another example, the electronic device may be a mobile phone, and sound may be generated from a receiver (earpiece speaker) used for a call. In addition, the electronic device may generate sound from an earphone, an external speaker, Bluetooth headphones / speakers, or the like.

  Note that the electronic devices of the embodiments and examples described above can also be realized by causing a computer to execute a software program that defines the processing procedures of the processing units 12 and 22 and the processing determination units 11 and 23.

  As mentioned above, although embodiment and the Example of this invention were described, this invention is not limited only to these embodiment and Example, In the range of the technical thought of this invention, these are combined. It may be used or a part of the configuration may be changed.

DESCRIPTION OF SYMBOLS 10 Electronic device 11 Processing determination part 12 Processing part 13 Output part 20 Electronic device 21 Sound source part 22 Processing part 23 Processing determination part 24 D / A converter 25 Analog filter 26 Audio amplifier 27 Analog filter 28 Speaker 29 Information storage part

Claims (6)

A process determination unit that acquires content information from the header of the sound content and determines an acoustic signal process to be performed on the sound content based on the content information;
A processing unit for performing the determined acoustic signal processing on the sound content;
And an output unit that outputs the sound content subjected to the acoustic signal processing. The process determining unit further determines an output volume of the sound content based on the content information,
The electronic device according to claim 1, wherein the output unit outputs the sound content on which the acoustic signal processing has been performed with the output volume. The content information includes at least sound source type information for identifying sound source types including human voice, music, and environmental sound, and each sound source type is associated with an acoustic signal process,
The said process determination part selects the audio | voice signal process corresponding to the sound source type shown in the sound source type information acquired from the header of the said sound content as what is performed with respect to this sound content. Electronic equipment. The content information of the sound content whose sound source type is music further includes genre information indicating a music genre, and each music genre is associated with an acoustic signal process,
4. The electronic device according to claim 3, wherein the processing determination unit selects that the sound signal processing corresponding to the music genre indicated in the sound source type information acquired from the header of the sound content is to be performed on the sound content. machine. Obtaining content information from the header of the sound content, and determining an acoustic signal processing to be performed on the sound content based on the content information;
Performing the determined acoustic signal processing on the sound content;
A content reproduction method for outputting the sound content subjected to the acoustic signal processing. A procedure of acquiring content information from the header of the sound content, and determining sound signal processing to be performed on the sound content based on the content information;
Performing the determined acoustic signal processing on the sound content;
A content reproduction program for causing a computer to execute a procedure for outputting the sound content subjected to the acoustic signal processing.

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