JP2008039870A - Effect adding apparatus and its program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an effect adding apparatus for enabling a high speed of a processing speed in simple configuration. <P>SOLUTION: An effect data decoding part 20 outputs to decode only head information 100 while a voice data decoding part 10 outputs to decode only a voice data stream 200, based on music data 300 compressed by an MP3 system concerning data comprising the head information 100 comprising information in regard to effect addition and the voice data stream 200 continuing to the head information 100. An effector part 30 grasps effect data 105 corresponding to timing data 110 obtained from a time management part 15, and adds an effect to output signals from the voice data decoding part 10 based on the grasped effect data 105. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique for adding an effect to an audio data stream such as a musical tone signal, and more particularly to an improvement in processing for switching an effect addition parameter at a desired timing.

  There has been proposed a music apparatus having a function of embedding necessary information in music data subjected to compression processing by a compression method such as MPEG and performing the decompression processing of music data based on this information (for example, Patent Document 1). In this music apparatus (karaoke apparatus), it is possible to change the pitch and the guide melody volume when functioning as a karaoke apparatus using MPEG audio data compression data.

JP 2002-297164 A (page 3-6, FIG. 4)

  However, since the data added to the audio data is embedded as a multiplexed stream, a decoder dedicated to the audio data and other data decoding are provided so that the given music data can be distributed to any decoder. The splitter was a large configuration required for stream processing. In addition, since various data are multiplexed and embedded, there is a problem that the decoding operation is increased and the processing speed is lowered. Therefore, when a required music effect is added by this karaoke apparatus and the music effect addition is switched at a plurality of timings, the effect addition parameters are sequentially extracted and reflected in the effect addition operation so that the operation speed is high. There was a limit to conversion.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide an apparatus and a program having an effector switching function that can increase the processing speed with a simple configuration.

In order to achieve the above object, the present invention is based on music data that is header data consisting of information relating to effect addition and data consisting of an audio data stream following the header information and compressed by a predetermined compression method. Audio data decoding means for decoding and outputting only the audio data stream;
Effect data decoding means for decoding and outputting only the header information;
Effect adding means for adding an effect to the output signal from the audio data decoding means based on the output signal of the effect data decoding means is provided.

  In this invention, the audio data decoding means is based on the music data which is the header information consisting of information relating to effect addition and the data consisting of the audio data stream following the header information and compressed by a predetermined compression method. While only the data stream is decoded and output, the effect data decoding means decodes and outputs only the header information, and the effect adding means outputs the output signal from the audio data decoding means based on the output signal of the effect data decoding means. Add effects. This eliminates the need for data distribution means, and simplifies the generation of data related to effect control.

  More specifically, in the above-described apparatus, the header information includes a combination of effect data that defines the effect addition contents and time information (effect addition time information) that activates the effect addition using the effect data. The effect addition means grasps the effect data corresponding to the effect addition time information obtained from the time information supply means for supplying time information based on the start time of decoding by the audio data decoding means. In addition, an effect may be added to the output signal from the audio data decoding means based on the grasped effect data.

And according to this invention, it is a program for performing the process regarding effect addition,
On the computer,
An audio data decoding function that decodes and outputs only the audio data stream based on music data that is composed of header information consisting of information relating to effect addition and audio data stream following the header information and is compressed by a predetermined compression method When,
An effect data decoding function for decoding and outputting only the header information;
A program for realizing an effect adding function for adding an effect to the output signal from the audio data decoding means based on the output signal of the effect data decoding means is provided.

  According to the present invention, an effect that an apparatus having an effector switching function can be realized with a simple configuration and a high processing speed can be obtained.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Constitution)
FIG. 1 is a configuration diagram of an effect adding device 1 according to an embodiment of the present invention, FIG. 2 is a structural diagram of supplied music data, and FIG. 3 is an explanatory diagram of an internal configuration of an audio data decoding unit 10. First, the structure of the music data 300 supplied to the apparatus 1 will be described with reference to FIG. As shown in FIG. 2A, the music data 300 includes header information 100 including effect addition related information, and an audio data stream 200 which is stream audio data. As shown in FIG. 2B, the header information 100 includes effect data 105 and timing data 110. Timing data “t 1, t 2,..., Tn” and effector data “e 1, e 2,..., En” each form a set, for example, the time t 1 with the start of decoding of the audio data stream 200 as a reference time. The effect adding process indicated by the effect data e1 is performed. The effect data 105 includes information necessary for effect addition such as the effect type, pan position, and reverberation level. The music data 300 itself is digital data that has been subjected to compression processing by a predetermined compression method such as MP3. Other methods such as MPEG can be used as the compression method.

  As shown in FIG. 1, the apparatus 1 includes an audio data decoding unit 10, an effector data decoding unit 20, an effect unit 30, a multiplier 40, and a speaker 50. The audio data decoding unit 10 decodes and outputs only the audio data stream 200 from the supplied music data 300. In this specification, “decode” means at least data decompression processing. Further, the effector data decoding unit 20 decodes and outputs only the header information 100. Then, the effector unit 30 supplies the effect addition signal generated based on the effect data 105 supplied from the effector data decoding unit 20 to the multiplier 40 at a timing specified by the timing data 110. In other words, a signal obtained by adding an effect to the signal from the audio data decoding unit 10 is output from the speaker 50 at a set timing. Although it is necessary to perform digital-analog conversion on the signal from the audio data decoding unit 10, a D / A converter is not shown in order to facilitate understanding of the invention.

  As shown in FIG. 3, the audio data decoding unit 10 includes a time management unit 15. In this embodiment, the time management unit 15 is configured to be able to start grasping the time in response to a reproduction start signal from the effect data decoding unit 20 and supply time information in response to a request from the effect data decoding unit 20. . Note that the time management is not limited to this example as long as the time can be grasped with the decoding start of the audio data stream 200 as a reference time. .

(Operation)
Next, the operation of the effect data decoding unit 20 will be mainly described in detail with reference to FIG. First, if the music data 300 is supplied, the effect data 105 and the timing data 110 are read from the header information 100 and stored in a storage unit (not shown) or the like (steps S400 and 405). Since the music data 300 is also supplied to the music data decoding unit 10, in step S410, the start of reproduction of only the audio data stream 200 is instructed (step S410). In response to this, the audio data decoder unit 10 starts reproduction of only the audio data stream 200 and starts managing the time information by the time management unit 15 using this as a reference time.

  Next, the counter “i” is set to “1” in step S415, and the current time “x” is acquired from the time management unit 15 in step S420. In step S425, it is determined whether or not the current time “x” is greater than or equal to the “i-th” timing data “y”. If the current time “x” is not greater than or equal to the “i-th” timing data “y” (No), the process waits in step S420, while in other cases (Yes), the effect addition timing has arrived. Determination is made and the process proceeds to step S430.

  In step S430, the effector data 105 is supplied to the effector unit 30. Then, the effector unit 30 outputs a signal for applying a required effect. As a result, a required effect is added to the output signal from the audio data decoding unit 10 at a required timing and the sound is emitted from the speaker 50.

  Further, in step S435, the counter “i” is incremented by 1 and the process proceeds to step S440. If the counter “i” is greater than “n” (n: total number of timing data) (No), the process proceeds to step S420. Then, the processing after step S420 is repeatedly continued. On the other hand, when the counter “i” is equal to or smaller than “n”, it is determined that all the effect adding operations are completed (“Yes” in step S440), and the operation is terminated.

  As described above, the audio data decoding unit 10 is data including header information 100 including information related to effect addition and the audio data stream 200 following the header information 100, and is compressed by a predetermined compression method (for example, MP3). The effect data decoding unit 20 decodes and outputs only the header information 100 while decoding and outputting only the audio data stream 200 based on the music data 300 that has been performed. The header information 100 is a plurality of sets of data composed of a set of effect data 105 that determines the contents of effect addition and timing data 110 that activates effect addition using the effect data 105. The effector unit 30 grasps the effect data 105 corresponding to the timing data 110 obtained from the time management unit 15 and adds an effect to the output signal from the audio data decoding unit 10 based on the grasped effect data 105. This eliminates the need for data distribution means and the like as in the conventional apparatus, and enables effect switching at a plurality of timings at high speed.

  Since the processing described above can be realized by a CPU (or a DSP or the like) executing a program recorded on a recording medium such as a ROM, an effect is added by, for example, a PC (personal computer) having a speaker. The device 1 can be realized. Further, for example, a guitar musical tone signal obtained by playing a guitar can be adopted as the music data, and the present apparatus 1 may be incorporated into a power amplifier. Furthermore, the effect adding apparatus 1 can be applied to a karaoke apparatus by using a human voice as the audio data stream.

  As described above, the effect adding device of the present invention is suitable for application to a device in the music field.

2 is a configuration diagram of an effect adding device 1. FIG. It is explanatory drawing of the structure of the music data. It is explanatory drawing of the time management part. FIG. 10 is an explanatory diagram of the operation of the effect data decoding unit 20.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Effect addition apparatus 10 Music data decoding part 15 Time management part 20 Effect decoder part 30 Effect part 40 Multiplier

Claims (3)

Audio data decoding means for decoding and outputting only the audio data stream on the basis of music data which is composed of header information consisting of information relating to effect addition and audio data stream following the header information and is compressed by a predetermined compression method When,
Effect data decoding means for decoding and outputting only the header information;
An effect adding device comprising: an effect adding means for adding an effect to the output signal from the audio data decoding means based on the output signal of the effect data decoding means. The apparatus of claim 1.
The header information is
It is a plurality of sets of data consisting of a set of effect data that defines the content of effect addition and time information (effect addition time information) that activates effect addition using the effect data,
The effect adding means is
The effect data corresponding to the effect addition time information obtained from the time information supply means for supplying the time information based on the start time of the decoding by the sound data decoding means is grasped, and the sound data is based on the grasped effect data. An effect adding device which is a means for adding an effect to an output signal from a decoding means. A program for executing processing to add an effect to an audio signal,
On the computer,
An audio data decoding function that decodes and outputs only the audio data stream based on music data that is composed of header information consisting of information relating to effect addition and audio data stream following the header information and is compressed by a predetermined compression method When,
An effect data decoding function for decoding and outputting only the header information;
A program for realizing an effect addition function for adding an effect to the output signal from the audio data decoding means based on the output signal of the effect data decoding means.

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