KR20110051672A - Effect and sound modulation equipment of audio device - Google Patents

Abstract

PURPOSE: A sound effect processing unit of an audio device is provided to offer the most suitable sound quality and tone through a combination of filters. CONSTITUTION: A sound effect determining unit(20) determines a general sound effect output mode and a special sound effect output mode. A digital signal processor(40) outputs a first address control signal. A filter processing unit(50) varies a filter coefficient. The filter processing unit outputs the second address control signal. A filter unit(60) embodies a sound effect by a first address control signal and a second address control signal.

Description

Effect and sound modulation equipment of audio device

The present invention relates to an apparatus for processing sound effects of an audio device, and more particularly, by using a digital signal processor and a filter, a special effect sound can be added to an audio signal by varying the filter coefficient according to various types of equations for a predetermined time. A sound effect processing apparatus for an audio device.

With the integration of semiconductor technology and the development of digital signal processing technology, there is a desire for players to implement various types of special effects when they play musical instruments. Often, you want to modulate the audio to create a unique tone.

As a method of reproducing music in an audio reproducing apparatus, including a portable terminal having an audio reproducing function, a method using an application programming interface (API) and a method using an independent digital signal processing (DSP) chip may be used.

In particular, although DSPs are widely used for modulating audio sounds, existing DSPs cannot satisfy the needs of performers or listeners with special effects to meet various types of needs.

Currently, devices that implement sound effects use analog or other types of DSPs in conjunction with DSPs, so high manufacturing costs are required. Therefore, studies are being actively conducted to improve existing DSPs to generate special sound effects.

In this way, the general DSP is a general performance device designed for various purposes, and it is not able to satisfy the new playing skills of specific instrumentalists, the desire for new notes, and the desire to listen to the optimal sound quality of music listeners. The sound effect generator is composed of fixed parameters, simple addition, subtraction, multiplication, and division, and thus, does not provide rich sound quality.

Accordingly, an object of the present invention is to form a combination of filters in series, parallel, or a combination of serial / parallel as necessary, and to combine normal address access with a reverse address access method and a forward access method. It is to provide a sound effect processing device of an audio device that can generate a special sound effect due to the sound or overflow to provide the optimal sound and sound quality.

An effect sound processing apparatus for an audio device according to the present invention for achieving the above object of the present invention includes an effect sound determination unit for determining a general sound effect output mode and a special sound effect output mode according to an external audio sound modulation command, and the general sound effect A digital signal processor for outputting a first address control signal in an output mode, a filter processor for outputting a second address control signal by varying a filter coefficient in the special sound effect output mode, and the first address control signal or a second address control And a sound modulator for adding the audio signal output from the digital signal processor and the filter unit.

In this case, the apparatus for processing sound effects of an audio device of the present invention includes a power supply unit to which a power on / off command is input, a user key input unit to which a user command including the external audio sound modulation command is input, and the power is turned on. The apparatus may further include a basic operation program for implementing an effect sound, an external information receiver for reading user setting data, and a memory unit for storing at least one effect sound data or music data encoded in a predetermined format.

The filter processor may further include a coefficient variable circuit for periodically or randomly varying the filter coefficients, a coefficient direction determination circuit for determining a coefficient reading direction when the filter coefficient is accessed, and a coefficient through the coefficient direction determination circuit. And a forward reading circuit for reading in a forward direction, a reverse reading circuit for reading coefficients in a reverse direction through the counting direction determination circuit, and a coefficient fixing circuit for fixing the filter coefficients.

The filter processing unit may include a sawtooth function generating circuit for increasing and decreasing the address of the memory in the form of a sawtooth function, a sine function generating circuit for increasing and decreasing the address of the memory in the form of a sine function, and the cosine function in the form of a cosine function. A cosine function generating circuit for increasing or decreasing a memory address, a triangular wave function generating circuit for increasing or decreasing a memory address in a triangular wave form, and at least one of the sawtooth function, sine function, cosine function, and triangular wave function generating circuit And an address determining circuit that stores and stores the addresses calculated using the circuit.

The filter unit may include a first address generator that generates an address by the first address control signal, a second address generator that generates an address by the second address control signal, and the first address generator. And an adder for summing the signals implemented in the second address generator and outputting a final address signal, a filter coefficient memory in which a filter coefficient is stored such that a address is determined by the final address signal of the summer, and a filter in the filter coefficient memory. And a single filter configured to receive coefficient data and an audio signal and output a filter output signal through a calculation function.

In this case, the filter unit is characterized in that a plurality of single filters are connected in any one of a series, parallel, series and parallel mixing.

Here, the filter unit when the plurality of single filters are connected in series, the filter coefficient of each single filter is changed over time, so that the output of the single filter of the preceding stage is sequentially input to the single filter of the next stage do.

When the plurality of single filters are connected in parallel, the filter unit selects a specific single filter to change the filter coefficient with time, and sums the outputs of each single filter so that the final output is performed.

On the other hand, the filter processing unit is characterized in that it comprises a distortion circuit for generating a filter coefficient so as to give an excessive amplification function when the user selects the overflow function.

In addition, the sound effect processing apparatus of the audio device of the present invention includes a power saving canceling circuit for canceling the power saving mode when a user command is input while maintaining a power saving mode, and a minimum circuit required for executing a user command when canceling the power saving mode. It characterized in that it comprises an operation circuit selection circuit for supplying power by selecting.

 According to the sound effect processing apparatus of the above-described audio device, a digital signal processor and a filter coefficient which program signals output from an audio device that generates a general audio signal such as an electronic musical instrument, an MP3, an audio amplifier, and the like, change the filter coefficient with time. There is an effect that can generate a variety of sound effects by using a combination of filters to change the coefficient position,

In addition, the present invention is configured by the configuration of the filter in the form of series, parallel, or a mixture of series and parallel, or by varying the filter coefficient using various types of functions by the general effect sound, special effect sound, periodic / aperiodic changes There is also the effect of creating a synthesized sound effect, an intentional overflow, allowing the player to create a dynamic sound effect that can transform the input and output into completely different modulated sounds.

In addition, the present invention also has the effect of minimizing the current consumption since power is supplied only to the necessary circuit at the moment of operation while maintaining the power saving mode.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Like reference numerals are used for like elements in describing each drawing.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention.

1 is a block diagram showing an internal configuration of an effect sound processing apparatus of an audio device according to an embodiment of the present invention, Figure 2 is a block diagram showing an internal configuration of a filter processing unit according to an embodiment of the present invention, Figure 3 4 is a block diagram showing an internal configuration of a filter unit according to an embodiment of the present invention, Figure 4 is an exemplary view showing various configurations of the filter unit according to an embodiment of the present invention, Figure 5 is according to an embodiment of the present invention A block diagram showing the configuration for the power saving mode is shown.

1 to 5, an apparatus for processing sound effects of an audio device according to an embodiment of the present invention includes a user key input unit 10, an effect sound determination unit 20, a digital signal processor (DSP) 40, and a filter processing unit ( 50, the filter unit 60, the sound modulator 70, the sound output unit 80, the power supply unit 90, the external information receiver 30, and the memory unit 100, but are not limited thereto.

First, the user key input unit 10 includes at least one operation key for instructing operation commands for various audio devices such as an electronic instrument and an MP3, and at least one effect sound selection key for instructing an audio sound modulation command for effect sound selection. .

The sound effect determination unit 20 determines a general sound effect output mode and a special sound effect output mode according to an external audio sound modulation command.

At this time, the external information receiving unit 30 reads the entire operation program necessary for the basic operation program for realizing the sound effect and the user dumped data from the program dump transmitted by the EEPROM or an external processor when the power is turned on, and the sound effect The determination unit 20 determines whether to use only the digital signal processor 40 or the filter processing unit 50 according to the effect sound output mode.

That is, the digital signal processor 40 may output a first address control signal in the general effect sound output mode, implement arithmetic functions with minimum time and current consumption, and implement a general 16-bit microprocessor function.

On the other hand, the filter processor 50 outputs the second address signal by varying the filter coefficient so that a special coefficient reading operation is performed to implement the effect sound impossible by the digital signal processor 40 in the special effect sound output mode.

The filter unit 60 implements an effect sound by the first address control signal or the second address control signal, and the sound modulator 70 outputs audio from the digital signal processor 40 and the filter unit 60. The signal is summed and output.

In this case, the sound output unit 80 finally outputs the audio signal output from the sound modulator 70 to an external amplifier.

The power supply unit 90 receives an on / off command of a system power supply, and the memory unit 100 stores at least one effect sound data or music data encoded in a predetermined format.

Meanwhile, as illustrated in FIG. 2, the filter processing unit 50 includes a coefficient variable circuit 51 that periodically or randomly varies the filter coefficient, and a coefficient for determining a coefficient reading direction when the filter coefficient is accessed. A direction reading circuit 52, a forward reading circuit 53a for making the coefficients read in the forward direction through the counting direction decision circuit 52, and a counting direction in the reverse direction through the counting direction decision circuit 52 A reverse reading circuit 53b for making the filter coefficient, a coefficient fixing circuit 53c for fixing the filter coefficient, a sawtooth function generating circuit 54a for increasing and decreasing the address of the memory in the form of a sawtooth function, and a sine function form And a cosine function generating circuit 54b for increasing and decreasing the address of the memory, a cosine function generating circuit 54c for increasing and decreasing the address of the memory in the form of a cosine function, and a triangle wave form. Calculated using a triangular wave function generating circuit 54d for increasing or decreasing the address of a memory, and at least one of the sawtooth wave function, the sine function, the cosine function, and the triangular wave function generating circuits 54a, 54b, 54c, and 54d. And an address determining circuit 55 for storing the address.

In particular, the filter processing unit 50 may further include a distortion circuit 56 for generating a filter coefficient so that the user gives an excessive amplification function when the overflow function is selected.

The filter unit 60 includes a first address generator 61 for generating an address based on the first address control signal, and a second address generator for generating an address based on the second address control signal ( 62, a summer 63 for adding the signals implemented in the first address generator 61 and the second address generator 62 to output a final address signal, and a final of the summer 63; A filter coefficient memory 64 in which filter coefficients are stored so that an address number is determined by an address signal, and a filter 65 receiving filter coefficient data and an audio signal from the filter coefficient memory 64 and outputting a filter output signal through an arithmetic function; It comprises a single filter (60 ') consisting of.

As shown in FIG. 4, the filter unit 60 may be connected to a plurality of single filters 1, 2, 3, and 4 (60a, 60b, 60c, and 60d) by either a series or parallel method.

First, when the plurality of single filters 60 'are connected in series, the filter unit 60 changes the filter coefficient of each single filter 60' according to time, and then sequentially outputs a single filter of the previous stage. It should be input of single filter of stage.

That is, a single filter 60 'is connected in series with N (1, 2, 3, ..., N) stages so that the output of one stage is input to two stage inputs, and the output of two stages is input to three stage inputs. In and out, the final Nth stage output is sent to an external amplifier.

In order to implement such a function, the filter of each stage can be used by changing or fixing a coefficient with time, and can also use only the filter coefficient of a specific stage.

The input A1_1 of the single filter 1 60a is a first address control signal coming from the digital signal processor 40 for a normal filter function, and A2_1 is a sawtooth wave, sine wave, cosine wave, or triangular wave function generating circuit to change the address of the filter. This is an address control signal produced by 54a, 54b, 54c, and 54d. ADAT_1 is an audio input signal. The filter output Out_1 enters the filter input data of the next stage (single filter 2) or the adder. In series connection, the output of the final N stage becomes the output of the final filter.

Next, when the plurality of single filters 60 'are connected in parallel, the filter unit 60 selects a specific single filter to change the filter coefficient with time, and adds the outputs of each single filter to the final output. Be sure to

That is, like the serial connection, the parallel connection can be used by selectively fixing / variing the coefficients of each stage.

On the other hand, as shown in Figure 5, a device for detecting the effect information in the user interface, the power saving canceling circuit for canceling the power saving mode when the user command input while maintaining the power saving mode for minimizing the current consumption ( 110 and an operation circuit selection circuit 120 for supplying power by selecting a minimum circuit necessary to execute a user command when the power saving mode is released.

Therefore, the effect sound determination unit 20 is supplied with power through the operation circuit selection circuit 120 to operate only the digital signal processor 40 or the digital signal processor 40 and the filter processing unit 50 together. It will work.

Hereinafter, the operation of the effect sound processing apparatus of the audio device according to an embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 6 is a block diagram illustrating a sound modulation operation for implementing sound effects in an apparatus for processing sound effects of an audio device according to an embodiment of the present invention, and FIG. 7 illustrates a special sound effect output mode of a filter processor according to an embodiment of the present invention. The process is shown in block diagram.

Referring to FIG. 6, the apparatus for processing sound effects of an audio device according to an exemplary embodiment of the present invention loads a basic operation program through a program dump when the power supply unit 90 is turned on, and outputs the general sound effect from the sound effect determination unit 20. Mode, special sound effects output mode (S1, S2)

Therefore, in the general effect sound output mode, the digital signal processor 40 performs an internal arithmetic function to output a general sound effect, and in the special effect sound output mode, the filter processor 50 performs a special coefficient reading operation. Perform modulation function (S3, S4)

Thereafter, the sound modulator 70 performs a final sound modulation by summing the signals calculated by the digital signal processor 40 and the filter processing unit 50, and the sound output unit 80 outputs final information to an external amplifier. (S5, S6)

Referring to FIG. 7, the filter processor 50 determines whether the filter coefficient is variable / fixed after receiving information on the filter from the outside. (S11, S12)

In the case of varying the filter coefficient, the coefficient variable circuit 51 determines a predetermined section every predetermined time to vary the filter coefficient, and it is determined whether the coefficient coefficient determination circuit 52 reads the filter coefficient in the forward / reverse direction. To process the read (S13, S14).

The reverse reading circuit 53b reads from the last address of the filter coefficient memory 64, and the forward reading circuit 53a reads the coefficient stored in the filter coefficient memory 64 while increasing the address. (S15, S16)

By the way, in the case where the filter coefficient is fixed without being changed, the fixed coefficient of the constant address is read by the coefficient fixing circuit 53c, and the same coefficient is used for a predetermined period (S17).

In this case, the filter processing unit 50 starts reading from the first address of the filter coefficient memory 64 in the case of the forward address, sequentially increases the address number, and then starts again at the original position when the desired address is reached. A sawtooth function that takes a sine, a sine function that increases or decreases the address in the form of a sine function for a gentle increase or decrease of the address, a cosine function that changes the address in the form of a cosine function, The address may use a triangular wave function and an address determination circuit 55 that determines a final address while preventing overflow or underflow of the address calculated using the function circuits 54a, 54b, 54c, and 54d as described above.

On the other hand, the filter processing unit 50 is in the distortion circuit 56 for creating a variable of the filter to give an excessive amplifier function when the user requires the overflow function in order to create a special effect by the user intentionally saturation state It also modulates the sound with dynamic sound effects.

Although described with reference to the above embodiments, those skilled in the art will understand that various modifications and changes can be made without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

      The present invention relates to an apparatus for processing sound effects of an audio device, and more particularly, by using a digital signal processor and a filter, a special effect sound can be added to an audio signal by varying the filter coefficient according to various types of equations for a predetermined time. A sound effect processing apparatus for an audio device.

1 is a block diagram showing an internal configuration of an effect sound processing apparatus of an audio device according to an embodiment of the present invention;

2 is a block diagram showing an internal configuration of a filter processing unit according to an embodiment of the present invention;

3 is a block diagram showing an internal configuration of a filter unit according to an embodiment of the present invention;

4 is an exemplary view showing various configurations of the filter unit according to an embodiment of the present invention;

5 is a block diagram showing a configuration for a power saving mode according to an embodiment of the present invention;

6 is a block diagram illustrating a sound modulation operation for implementing sound effects in an effect sound processing apparatus of an audio device according to an embodiment of the present invention;

7 is a block diagram showing the progress of the special sound effect output mode of the filter processing unit according to an embodiment of the present invention.

*** Explanation of symbols for main parts of drawing ***

10: user key input unit 20: sound effect determination unit

30: external information receiver 40: digital signal processor

50: filter processing unit 60: filter unit

70: sound modulator 80: sound output unit

90: power supply section 100: memory section

110: power supply DR release circuit 120: operation circuit selection circuit

Claims (10)

An effect sound determination unit for determining a general sound effect output mode and a special sound effect output mode according to an external audio sound modulation command; A digital signal processor configured to output a first address control signal in the general effect sound output mode; A filter processor for outputting a second address control signal by varying a filter coefficient in the special sound effect output mode; A filter unit for implementing an effect sound by the first address control signal or the second address control signal; And a sound modulator for summing and outputting the digital signal processor and the audio signal output from the filter unit. The method of claim 1, A power supply unit to which a power on / off command is input; A user key input unit to which a user command including the external audio sound modulation command is input; When the power is ON, the external information receiving unit for reading the basic operation program and user setting data for implementing the sound effect, And at least one memory for storing sound effect data or music data encoded in a predetermined format. The method of claim 1, The filter processing unit A coefficient variable circuit for periodically or randomly varying the filter coefficients; A coefficient direction determination circuit for determining a coefficient reading direction when the filter coefficient is accessed; A forward read circuit for making a coefficient read in a forward direction through the count direction determining circuit; A reverse reading circuit for reading coefficients in a reverse direction through the counting direction determination circuit; And a coefficient fixing circuit for fixing the filter coefficients. The method according to claim 2 or 3, The filter processing unit, A sawtooth function generating circuit for increasing or decreasing the address of the memory in the form of a sawtooth function, A sinusoidal function generating circuit for increasing or decreasing the address of the memory in a sinusoidal form; A cosine function generating circuit for increasing or decreasing the address of the memory in the form of a cosine function, A triangular wave function generating circuit for increasing or decreasing the address of the memory in a triangular wave form; And an address determination circuit for adding and storing addresses calculated using at least one of the sawtooth function, the sine function, the cosine function, and the triangular wave function generation circuit. The method of claim 1, The filter unit, A first address generator which generates an address by the first address control signal; A second address generator which generates an address by the first address control signal; A summer for adding the signals implemented in the first address generator and the second address generator to output a final address signal; A filter coefficient memory in which a filter coefficient is stored such that the address is determined by a final address signal of the summer; And a single filter including a filter for receiving filter coefficient data and an audio signal from the filter coefficient memory and outputting a filter output signal through an arithmetic function. The method of claim 5, The filter unit is a sound effect processing apparatus for an audio device, characterized in that a plurality of single filters are connected in any one of a series, parallel, serial and parallel mixing. The method of claim 6, When the plurality of single filters are connected in series, the filter unit changes the filter coefficient of each single filter with time, and sequentially outputs the output of the single filter of the previous stage to the input of the single filter of the next stage. Sound effect processing device of the device. The method of claim 6,  When a plurality of single filters are connected in parallel, the filter unit selects a specific single filter to change the filter coefficient with time, and adds the outputs of each single filter so that the final output is performed. Device. The method of claim 1, And the filter processing unit includes a distortion circuit for generating a filter coefficient so as to give an excessive amplification function when the user selects the overflow function. The method of claim 1, A power saving cancel circuit for canceling the power saving mode when a user command is input while maintaining the power saving mode; And an operation circuit selecting circuit for supplying power by selecting a minimum circuit necessary to execute a user command when the power saving mode is released.

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