KR100194042B1 - Pitch processing device and method of sound equipment - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

It relates to sound equipment.

2. The technical problem to be solved by the invention

Provided are a pitch processing apparatus and method for an acoustic apparatus for suppressing noise on a reproduction sound generated by pitch raising / falling in a pitch processing apparatus.

3. Summary of Solution to Invention

In a sound apparatus having a control unit for generating a pitch up / down control signal by a pitch up / down key from a key input unit, a method for removing noise generated when adjusting the pitch of a reproduced voice signal may be performed. Inputting the sampling data of the audio signal applied every time a control signal is generated so that the second half of the preprocessing data and the first half of the postprocessing data overlap on the time axis; and the pitch raising mode is set by the pitch raising control signal. Decimating the first end of the preprocessed data by the input process, and repeating the same data after the decimation process and attaching the same data to the preprocessed data, and the second half of the preprocessed data after the interval repetition process. Store the stage, and the first stage of the post-process data following the pre-process data. A first overlap addition process of overlapping and outputting the second half of the data; interpolating the first end of the preprocessed data by the input process when the pitch lowering mode is entered by the pitch lowering control signal; and after the interpolation process A second overlap addition process of deleting a second half end of the preprocessing data, and storing a second half end of the preprocessing data after the deleting process, and adding and outputting the first half of the post-processing data overlapping with the second half of the preprocessing data. Achieves

4. Important uses of the invention

This is implemented to improve the unclearness of the reproduction sound generated when the pitch is raised or lowered in the audio device.

Description

Pitch processing device and method of sound equipment

1 is a block diagram of a conventional acoustic device.

2 is a block diagram illustrating a pitch processing apparatus in a conventional acoustic apparatus.

3 shows a control flowchart of FIG. 2;

4A is a diagram showing signal waveforms generated when the pitch of FIG. 3 is to be increased.

4b is a diagram showing a signal waveform generated when the pitch is lowered in FIG.

5 is a block diagram of a pitch processing apparatus in an acoustic apparatus according to a preferred embodiment of the present invention.

6 shows a control flowchart of FIG.

7a is a view showing a signal waveform diagram generated when trying to increase the pitch of 1/2 octave in FIG. 6,

FIG. 7B is a diagram showing signal waveforms generated when lowering the pitch of 1/2 octave in FIG.

* Explanation of symbols for main parts of the drawings

20: first switching unit 26: repeating unit

28: delete unit 30, 32: multiplier

38: second switching unit 50: first delay

51: decimator 52: interpolator

53: second delay 54: third window table

55: fourth window table 56: third delay

57: fourth delay unit 58: first adder

59: second adder

The present invention relates to an acoustic apparatus, and more particularly, to an apparatus and a method for removing noise of a reproduction sound generated when a pitch is raised or lowered by a pitch setting key in a pitch processing device.

Typically, an acoustic device that allows a user to sing in accompaniment with accompaniment has a device for adjusting the pitch. Accordingly, the pitch processing device increases or decreases the pitch of the sound signal applied by the pitch up key and the pitch down key at the request of the user. The user uses the pitch up key and the pitch down key when the user's pitch is lower or higher than the pitch information recorded in the sound apparatus.

1 is a block diagram of a conventional sound device. Hereinafter, a description will be given with reference to FIG. 1.

The speech signal reproduced and decoded from the sound reproducing apparatus is applied to the pitch processing apparatus 100.

The pitch processing apparatus 100 includes a key input unit 150 including a pitch up key and a pitch down key, a controller 140 for outputting a pitch up / down control signal by the pitch up / down key, and a digital signal by inputting the voice signal. A digital signal processor (hereinafter referred to as a DSP) which inputs the output of the A / D 110 and converts the pitch into a pitch up / down control signal and adjusts the pitch to output the same. And a D / A 130 that converts the output of the DSP 120 into an analog signal and outputs the analog signal.

The mixer 160 hereinafter referred to as MIX (MIXer) combines the output signal of the pitch processing apparatus 100 and the user's voice signal applied from the microphone MIC and outputs the same to the speaker.

2 is a block diagram illustrating a pitch processing apparatus in a conventional acoustic apparatus. Hereinafter, a description will be given with reference to FIG. 2.

The first switching unit 20 inputs the output of the A / D converter 110 to switch the switching terminal S1, which is the first passage, to the first terminal 1 based on the pitch raising control signal, or is the second passage based on the pitch lowering control signal. The switching terminal S1 is switched to the second terminal 2.

The decimator 22 digitizes the data applied by the first passage. The repeater 26 inputs and copies the output of the decimator 22 and attaches it to the rear end of the output of the decimator 22. The multiplier 30 multiplies the first window data of the first window table 34 by the output of the repeater 26.

Interpolator 24 interpolates the data applied by the second passage. The deleting unit 28 deletes the rear end of the output of the interpolator 24. The multiplier 30 multiplies the second window data of the second window table 36 by the output of the deleting unit 26.

The second switching unit 38 inputs the outputs of the multipliers 30 and 32 to switch the switching terminal S2, which is the first passage, to the first terminal 3 based on the pitch raising control signal, or to switch the second passage based on the pitch lowering control signal. Terminal S4 is switched to fourth terminal 4. Thus, the output of the second switching unit 38 is output to the D / A 130.

3 is a diagram illustrating a control flowchart of FIG. 2. FIG. 3 is a control flowchart of FIG. 2. FIG. 4A is a diagram showing signal waveforms generated when the pitch is increased in FIG. 3, and FIG. 4B is a diagram showing signal waveforms generated when the pitch is lowered in FIG. Hereinafter, a detailed description will be made with reference to FIGS. 3, 4A, and 4B.

In step 312, N pieces of data are input. In this case, the waveform 400 is a signal waveform of N data continuously applied.

First, a case in which the pitch raising control signal is input in step 314 will be described. Then, a first passage is formed in the first and second switching 20 and 38. In step 316, the processing data N of the data applied through the first passage is decimated, and the result thereof is a waveform such as waveform 410 that decimates ⓐ and ⓑ and outputs ⓐ 'and ⓑ'. Thereafter, the decimated result values ⓐ 'and ⓑ' are repeated in steps 318 to form waveforms such as waveform 410. In operation 320, the waveform 410 output from the repeater 26 is multiplied by the multiplier 30 with the waveform 420, which is the first window data. This is to remove the discontinuities in the block boundary. Processing data N corresponding thereto is output by the first passage of the second switching unit 38. Its signal waveform diagram is waveform 430.

Secondly, a case in which the pitch lowering control signal is input in step 324 will be described. Then, a second passage is formed in the first and second switching 20 and 38. In step 326, the processed data N of the data applied through the first passage is interpolated, and the result thereof is interpolated ⓐ, ⓑ and outputted as ⓐ ', ⓑ' (not shown). Subsequently, in step 328, the output of the deleting unit 28 becomes a waveform similar to the waveform 450 by deleting the second part ⓑ '. In operation 330, the waveform 450 output from the eraser 28 is multiplied by the multiplier 32 with the second window data 420. Processing data N corresponding thereto is output by the second passage of the second switching unit 38. Its signal waveform diagram is waveform 460.

The problem in the prior art is that when the pitch raising operation is performed by the pitch raising key, the same sound is repeated in the processing data N / 2 units, thereby causing an echo phenomenon, thereby making the reproduction sound unclear. In addition, when the pitch lowering operation is performed by the pitch lowering key, information of the rear end of the processing data N is deleted, thereby causing degradation of the playback sound.

Accordingly, an object of the present invention is to provide a pitch processing apparatus and method for an acoustic apparatus that improves sound intelligibility by suppressing noise of a reproduction sound generated by pitch up / down in a pitch processing apparatus.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that like elements in the figures represent like reference numerals wherever possible.

The term preprocessing data used herein refers to data of preset bits for sampling data of a voice signal, and the term postprocessing data is generated following the preprocessing data and represents the same bit data as the preprocessing data.

5 is a block diagram illustrating a pitch processing apparatus in an acoustic apparatus according to an exemplary embodiment of the present invention. Hereinafter will be described in detail with reference to FIG.

The first switching unit 20 inputs the output of the A / D 110 of FIG. 1, and the switching terminal S1, which is the first passage, is switched to the first terminal 1 based on the pitch raising control signal, or the second switching unit is based on the pitch lowering control signal. The switching terminal S1 serving as a passage is switched to the second terminal 2 to output the output of the A / D 110.

The first delay unit 50 interferes with the latter half of the processing data N applied by the first passage. In this case, the processed data N refers to the number of data bits N sampled in the sampled speech signal. The processing data N is also referred to as preprocessing data.

The decimator 51 digitizes and outputs the processing data N applied by the first passage. The decimator 51 decimates and outputs the latter half of the preprocessing data N stored in the first delay unit 50 and the first half of the processing data N applied in the first passage thereafter. The processing data N at this time is called post processing data.

The repeater 26 inputs and copies the output of the decimator 51 and attaches it to the rear end of the output of the decimator 51. The multiplier 30 multiplies the third window data of the third window table 54 by the output of the repeater 26.

The third delay unit 56 then temporarily stores the latter half of the multiplied preprocessed data to be applied. The first adder 58 adds the preprocessed data stored in the third delay unit 56 and the post-processed data output from the multiplier 30. In other words, the processed data N currently processed and the processed data N processed in the previous process are superimposed on the time axis.

The second delay unit 53 stores the latter half end of the preprocessing data N applied by the second passage.

The interpolator 52 interpolates and outputs the first half of the post-processing data N applied by the second passage and the second half of the preprocessing data N delayed by the second delay unit 53. In this case, the second half of the processing data N of the second delay unit 53 is preceded in time by the first half of the processing data N processed by the interpolator 52.

The deleting unit 28 deletes the rear end of the output of the interpolator 24. The multiplier 32 multiplies the fourth window data of the fourth window table 55 by the output of the deleting unit 28.

Thereafter, the fourth delay unit 57 temporarily stores the latter half of the multiplied preprocessed data to be applied. The second adder 59 adds data stored in the fourth delay unit 57 and data output from the multiplier 32. That is, the currently processed preprocessed data N and the postprocessed data N processed in the previous process are superimposed on the time axis and added (hereinafter referred to as OLA (Over Lap and Add)).

In addition, the second switching unit 38 inputs the outputs of the first and second adders 58 and 59 to the first terminal 3 based on the high pitch raising control signal, and the switching terminal S2 is switched to the first terminal 3 or the pitch lowering control signal. As a result, the second terminal switching terminal S4 is switched to the fourth terminal 4. Thus, the output of the second switching unit 38 is output to the D / A 130.

6 is a view showing a control flowchart of FIG. 7A is a diagram showing signal waveforms generated when the pitch of 1/2 octave is increased in FIG. 6, and FIG. 7B is a signal generated when the pitch of 1/2 octave is lowered in FIG. A diagram showing a waveform diagram. Hereinafter, a description will be given in detail with reference to FIGS. 6, 7a, and 7b.

In the present invention, it will be described taking into consideration the case of raising 1/2 octave by doubling the pitch up and the case of lowering 1/2 octave by halving the pitch.

In step 612, the processing data N is input so that N / 2 overlaps on the time axis. That is, the latter half stage N / 2 of the preprocessed data is stored using the first and second delay units 50 and 53.

First, a case in which the pitch raising control signal is input will be described with reference to FIG. 7A.

When the pitch up control signal is input in step 614, in step 616, the decimator 51 decimates the processing data N of ⓐ and ⓑ of the waveform 712. At this time, the first delay unit 50 stores the processing data of ⓑ. In step 618, the data decimated ′ ′ ⓑ ′ of the decimated waveform 714 is repeated, and the waveform 716 is output from the repeater 26. The multiplier 30 multiplies the waveform 718 which is the third window data in step 620. Thus, the output waveform of the multiplier 30 is the same as the waveform 720 ⓐ ⓑ. The third delay unit 56 stores the rear end of the data of the waveform 720 ⓐ ⓑ. Subsequently, waveforms 728 ⓑ ⓒ are generated in waveforms 724 ⓑ '© by the steps 616, 618, and 620. The first adder 58 adds the rear end of the data of the waveform 720 ⓐ ⓑ of the third delay 56 and the front end of the waveform 728 ⓑ ⓒ. That is, the OLA process is performed in step 622. Thereafter, the second switching unit 38 in which the first passage is formed in step 634 outputs ⓐ *, ⓑ *, ⓒ * of waveform 736. Each output of ⓐ *, ⓑ *, ⓒ * is the processing data N / 2.

Second, let's look at the case where the pitch down control signal is input. When the pitch lowering control signal is input in step 624, the interpolator 52 interpolates the processing data N of ⓐ and ⓑ of the waveform 712. At this time, the second delay 53 stores the processing data of ⓑ. After the interpolator in step 628, the process data of ⓑ 'is deleted. The multiplier 32 multiplies the generated ⓐ 'data of the waveform 744 by the fourth window data waveform 746 in step 630. Thus, the output waveform of the multiplier 30 is equal to the waveform 748 ⓐ. The fourth delay unit 57 stores the rear end of the data of the waveform 748 ⓐ. Afterwards, waveform 756 ⓑ is generated in waveform 752 ⓑ 'by steps 626, 628 and 630. The second adder 59 adds the rear end of the data of the waveform 748 ⓐ of the fourth delay unit 57 and the front end of the waveform 756 ⓑ. That is, waveforms 758 and 760 are added by the second adder 59. That is, the OLA process is performed in step 632. Thus, in step 634, the second switching unit 38 in which the second passage is formed outputs? *,? *,? * Of waveform 764. Each output of ⓐ *, ⓑ *, ⓒ * is the processing data N / 2.

Accordingly, the first and second delayers 50 and 53 temporarily store the data of ⓑ, that is, the rear end of the processing data N, and then decimate and interpolate the data and data of ⓒ applied to the rear end of the processing data N. Then, the data discarded by the third and fourth delay units 56 and 57 and the first and second adders 58 and 59 are reduced.

As described above, the speech processing apparatus minimizes the amount of information removed by the pitch lowering, in particular, the amount of frequency components, and the speech processing apparatus minimizes obscurity such as echo shape due to simple radiation due to pitch raising.

Claims (9)

A sound device having a control unit for generating a pitch up / down control signal by a pitch up / down key from a key input unit, the apparatus for removing noise generated when the pitch of a reproduced voice signal is adjusted, wherein the pitch up control Switching means for inputting and outputting sampling data of the audio signal by forming a second passage based on the first passage and the pitch lowering control signal based on the signal, and the sample applied by the first and second passages; A first delay for storing and delaying a rear end of the predetermined preprocessing data for the ring data, and a post-processing applied after the preprocessing data applied through the first processing data and the first passage of the first delayer. A dataator for decimating the front end of the data, a repeater for inputting and copying the output of the decimator, and the line of the first delay unit An interpolator for interpolating a rear end of the processed data and a front end of the post-processed data applied through the second passage, a deletion unit for deleting a rear end of the output of the interpolator, an output of the repeater for the preprocessed data, or the And a second delay unit for storing the deletion unit output and an adder for adding the post-processing data output from the repeater or the deletion unit to a predetermined overlap with the line processing data of the second delay unit. Processing unit. 2. The apparatus of claim 1, wherein output data of the adder, which is added in a predetermined overlap, is the same bit length as the preprocessing data and the postprocessing data. The speech processing apparatus of claim 1 or 2, wherein the post-processing data is the preprocessing data based on the order of the applied sampling data. The apparatus of claim 3, wherein the front end and the rear end are the front end and the rear end of one half of the line / post-process data. A sound device having a control unit for generating a pitch up / down control signal by a pitch up / down key from a key input unit, the apparatus for removing noise generated when the pitch of a reproduced voice signal is adjusted, wherein the pitch up control First switching means for inputting and outputting sampling data of the audio signal by forming a second passage based on the first passage and the pitch lowering control signal based on the signal, and the sampling applied by the first passage; A first delay for storing and delaying a second half of the predetermined first preprocessed data for the data, and a post-process applied after the preprocessed data applied through the second half of the preprocessed data of the first delay and the first passage. A decimator for decimating the first half of the data, an iteration unit for inputting and copying the output of the decimator, and the second passage. A second delayer for storing and delaying a second half of predetermined second preprocessing data with respect to the sampling data to be applied; and the first delay applied through the second half of the preprocessing data of the second delay and the second passage. An interpolator for interpolating the first end of the second post-process data applied after the preprocessed data, a deletion unit for deleting the second end of the output of the interpolator, and first window data to multiply the output of the repeater. A second multiplier having a first multiplier, a second window data, and a multiplier for multiplying the output of the eraser, a third delay for storing a second half of the output of the repeater with respect to the first preprocessed data, and the second preprocessing A fourth delayer for storing a second half of an output of the eraser for data, and the first post-processing data output from the first multiplier; A first adder that adds one line of pre-processed data and a second adder that adds the second post-processed data output from the second multiplier and a second line of pre-processed data of the second delayer; And a second switching unit configured to input and selectively output outputs of the first adder and the second adder by forming a second path based on a first signal and the pitch lowering control signal based on a control signal. Pitch processing unit The sound device according to claim 5, wherein the output data of the first and second adders, which are added in a predetermined overlap, is the same bit length as the first and second preprocessing data and the first and second postprocessing data. Voice processing device. The sound processing apparatus according to claim 5 or 6, wherein the first and second post-processing data become the first and second preprocessing data based on the order of the applied sampling data. A sound device having a control unit for generating a pitch up / down control signal by a pitch up / down key from a key input unit, the method for removing noise generated when adjusting the pitch of a reproduced voice signal, the pitch up And inputting the sampling data of the audio signal applied each time the down / down control signal is generated so that the second half of the preprocessed data and the first half of the postprocessed data overlap on the time axis, and the pitch is raised by the pitch up control signal. Decimating the first end of the preprocessing data by the input process when the mode is entered, a section repetition process of copying and pasting the same data to the preprocessing data after the decimation process, and the preprocessing data after the section repetition process. And store the latter half of the first half of the post-processed data following the preprocessed data. A first overlap addition process of overlapping and outputting the second half of preprocessing data; interpolating the first end of the preprocessing data by the input process when the pitch lowering mode is entered by the pitch lowering control signal; and the interpolation process Thereafter, the second half of the preprocessing data is deleted, and the second half of the preprocessing data is stored after the deleting process, and the first half of the postprocessing data is added to overlap with the latter half of the preprocessing data. Voice processing method in the sound device, characterized in that consisting of a process. The method of claim 8, further comprising multiplying the first window data set previously with the data generated after the interval repetition process and multiplying the second window data preset with the data generated after the deleting process. A voice processing method in an acoustic device characterized in that.