CN101211563A - sound signal processing method - Google Patents

Abstract

A sound signal processing method includes the following steps: first, obtaining a voltage signal according to a preset sound volume; then, defining a volume sampling interval according to a minimum voltage peak value and a maximum voltage peak value of the voltage signal; and then, sampling the sound to be sampled according to the volume sampling interval.

Description

sound signal processing method

technical field

The invention relates to a sound signal processing method, and in particular to a sound signal processing method for adjusting sampling methods according to different sound source characteristics.

Background technique

Currently, some of the mobile phones on the market have been designed with anti-noise technology, which can filter out the sounds that are too loud or the frequency is too high or too low in the environment, so that the user's voice can be clearly transmitted. However, the existing technologies are designed for the vocal frequency and volume of the general public. For some people with special voices, such as women with high-pitched voices or men with low-pitched voices, because their voice frequencies are higher or lower than the sampling range, they will be affected. to filter out, so this noise immunity feature cannot be used.

Contents of the invention

In view of this, the purpose of the present invention is to provide a sound signal processing method, which can adjust the sampling range according to the vocal characteristics of different people, and can preserve the user's voice and filter out environmental noise.

According to the purpose of the present invention, a first sound signal processing method is proposed, comprising the following steps: first, according to the volume of the preset sound, a voltage signal is obtained; then, according to the minimum voltage peak value and the maximum voltage peak value of the voltage signal, the volume sampling interval is defined; Then, according to the volume sampling interval, the sound to be sampled is sampled.

According to the purpose of the present invention, a second sound signal processing method is proposed, which includes the following steps. First, the frequency signal is obtained according to the frequency of the preset sound; then, the frequency sampling interval is defined according to the minimum frequency peak value and the maximum frequency peak value of the frequency signal; then, the sound to be sampled is sampled according to the frequency sampling interval.

According to the purpose of the present invention, a third sound signal processing method is proposed, which includes the following steps. Firstly, the voltage signal is obtained according to the volume of the preset sound; then, n voltage intervals are defined according to the minimum voltage peak value and the maximum voltage peak value of the voltage signal; then, the s1th to t1th voltage intervals of the n voltage intervals are set as The volume sampling interval, where 1<s1<t1<n; then, according to the volume sampling interval, the sound to be sampled is sampled.

According to the purpose of the present invention, a fourth sound signal processing method is proposed, which includes the following steps. First, the frequency signal is obtained according to the frequency of the preset sound; then, m frequency intervals are defined according to the minimum frequency peak and the maximum frequency peak of the frequency signal; then, the s2 to t2 frequency intervals of the m frequency intervals are set as The frequency sampling interval, where 1<s2<t2<m; then, according to the frequency sampling interval, the sound to be sampled is sampled.

In order to make the above-mentioned purposes, features, and advantages of the present invention more comprehensible, the preferred embodiments are specifically cited below, together with the accompanying drawings, and are described in detail as follows:

Description of drawings

Fig. 1 shows the functional schematic diagram of the electronic device applying the present invention;

Fig. 2 shows the sound signal processing flow chart of embodiment one of the present invention;

Fig. 3 represents the schematic diagram of the voltage signal of preset sound volume;

Fig. 4 represents the voltage signal schematic diagram of the sound to be sampled;

Fig. 5 shows the frequency signal schematic diagram of preset sound;

Fig. 6 represents the schematic diagram of the frequency signal of the sound to be sampled; and

FIG. 7 shows a flow chart of audio signal processing in Embodiment 2 of the present invention.

Description of main component marking

100: Electronics

110: Ontology

120: microphone

130: processing unit

140: memory unit

150: Set button

Detailed ways

Embodiment one

Please refer to FIG. 1 , which shows a functional diagram of an electronic device applying the present invention. The electronic device 100 includes a main body 110 , a microphone 120 , a processing unit 130 , a memory unit 140 and a setting button 150 . After the user's voice is recorded by the microphone 120 , it is converted into a voltage signal representing volume and a frequency signal representing frequency by the processing unit 130 , and stored in the memory unit 140 . The processing unit 130 obtains the sampling range according to the voltage signal and frequency signal representing the characteristics of the user's voice, and stores it in the memory unit 140, and then filters the user's voice according to the sampling range, so that the user's voice can be clearly heard convey it. And when changing the user, only need to press the setting button 150 connected with the processing unit 130, the original sampling range can be erased, and a new sampling range can be obtained by recording a new user's voice. The electronic device 100 may include a mobile phone, a voice recorder, a language learning machine, an MP3 player, or any electronic device with a radio function.

Please refer to FIG. 2 , which shows a flow chart of audio signal processing according to Embodiment 1 of the present invention, and please also refer to the component numbers in FIG. 1 . First, as shown in step 201 , please refer to FIG. 3 , which shows a schematic diagram of a voltage signal of a preset sound volume. The electronic device 100 uses the microphone 120 to obtain the voltage signal Vs as shown in FIG.

Next, as shown in step 202 , the processing unit 130 defines a volume sampling interval according to the minimum voltage peak value LV and the maximum voltage peak value HV of the voltage signal Vs, that is, between 0V-5V.

Then, as shown in step 203, the volume sampling interval is divided into n voltage intervals. Taking the voltage signal Vs as an example, since the minimum voltage peak LV and the maximum voltage peak HV are between 0V and 5V, n=8, and the interval from 0V to 5V is divided into 8 intervals. That is, 0V-0.625V is set as the first interval, 0.625V-1.25V is set as the second interval, 1.25V-1.875V is set as the third interval, 1.875V-2.5V is set as the fourth interval, 2.5V-3.125V is set as the fifth interval, 3.125V-3.75V is set as the sixth interval, 3.75V-4.375V is set as the seventh interval, 4.375V-5V is set as the eighth interval, the voltage signal Vs does 8-bit encoding. In this embodiment, the ranges of the voltage intervals are the same, but different ranges can also be set respectively, and the present invention is not limited thereto. In addition, although the volume is encoded in 8 bits in this embodiment, more sampling intervals can be divided into higher resolutions, such as 24 bits, 32 bits, or 128 bits, etc., to obtain more delicate volume changes.

Next, as shown in step 204 , please refer to FIG. 4 , which shows a schematic diagram of the voltage signal of the sound to be sampled. The processing unit 130 samples the to-be-sampled voltage signal SV of the to-be-sampled sound according to the volume sampling interval defined in step 203 , such as the sound of the user talking in a noisy environment. That is to say, the processing unit 130 samples the portion of the voltage signal SV to be sampled corresponding to the volume of the sound to be sampled that is located in the volume sampling interval. Since the volume sampling range is between 0V-5V, the voltage signal greater than 5V will not be sampled, and a sound with a moderate volume will be obtained.

Then, as shown in step 205 , please refer to FIG. 5 , which shows a schematic diagram of the frequency signal of the preset sound. According to the frequency of the preset sound, the frequency signal Fs is obtained.

Next, as shown in step 206 , according to the minimum frequency peak value LF and maximum frequency peak value HF of the frequency signal Fs, a frequency sampling interval is defined, that is, between 500 Hz and 2000 Hz.

Then, as shown in step 207, the frequency sampling interval is divided into m frequency intervals. In this embodiment, the frequency signal Fs is generally located between 500 Hz-2000 Hz, and m=8, which is divided into 8 frequency intervals. That is to say, set 500Hz-687.5Hz as the first interval, 687.5Hz-875Hz as the second interval, 875Hz-1062.5Hz as the third interval, 1062.5Hz-1250Hz as the fourth interval, and 1250Hz-1437.5Hz as the fourth interval. 1437.5Hz-1625Hz is set as the sixth zone, 1625Hz-1812.5Hz is set as the seventh zone, and 1812.5Hz-2000Hz is set as the eighth zone, and the frequency signal Fs is coded by 8 bits. In this embodiment, the ranges of the frequency intervals are the same, but different ranges can also be set respectively, and the present invention is not limited thereto. In addition, although the frequency is encoded by 8 bits in this embodiment, more sampling intervals can be divided into higher resolutions, such as 24 bits, 32 bits or 128 bits, etc., to obtain more delicate frequency changes.

Next, as shown in step 208 , please refer to FIG. 6 , which shows a schematic diagram of the frequency signal of the sound to be sampled. The processing unit 130 samples the to-be-sampled frequency signal SF of the to-be-sampled sound according to the frequency sampling interval. For example, the sound made by the user in a noisy environment. That is to say, the processing unit 130 samples the portion of the frequency signal SF to be sampled corresponding to the frequency of the sound to be sampled located in the frequency sampling interval. Since the frequency sampling range is between 500Hz-2000Hz, the frequency signal of the low frequency part less than 500Hz or the frequency signal of the high frequency part greater than 2000Hz will not be sampled, and a sound closer to the frequency of the original user's speech is obtained.

In addition, between step 204 and step 205, this embodiment may further include filtering the frequency signal to be sampled SF corresponding to the sound to be sampled with a bandpass filter, so as to filter out most of the noise in advance. The frequency range of the band-pass filter can be set to be between 100 Hz and 4000 Hz, which is the frequency range of the voice of ordinary people.

In this embodiment, steps 201-204 sample the volume part, and steps 205-208 sample the frequency part. In fact, the processing unit 130 can sample the volume and the frequency simultaneously or separately, so steps 205-208 can be performed first, and then steps 201-204 can be performed, and the present invention is not limited thereto.

Embodiment two

Please refer to FIG. 7 , which shows the flow chart of sound signal processing in Embodiment 2 of the present invention, and please also refer to the component numbers in FIG. 1 . First, as shown in step 301 and referring to FIG. 3 , the voltage signal Vs is obtained according to the volume of the preset sound.

Next, as shown in step 302 , the processing unit 130 defines n voltage intervals according to the minimum voltage peak value LP and the maximum voltage peak value HP of the voltage signal Vs. In this embodiment, 8 voltage intervals (n=8) are defined between 0V-5V. The ranges of the eight voltage intervals are the same, but not limited thereto.

Then, as shown in step 303 , the processing unit 130 sets the s1 th to t1 th voltage intervals of the n voltage intervals as volume sampling intervals, where 1<s1<t1<n. In this embodiment, n=8, and it is assumed that the minimum peak voltage LV falls within the second interval, and the maximum voltage peak HV falls within the seventh interval 3.75V-4.375V. Therefore, s1=2, t1=7 can be set, and 0.625V-4.375V is set as the volume sampling interval.

Next, as shown in step 304 and with reference to FIG. 4 , the sound to be sampled is sampled according to the volume sampling interval. That is, the part of the voltage signal SV to be sampled corresponding to the volume of the sound to be sampled located in the volume sampling interval is sampled.

Then, as shown in step 305, and refer to FIG. 5 . According to the frequency of the preset sound, the frequency signal Fs is obtained.

Next, as shown in step 306 , the processing unit 130 defines m frequency intervals according to the minimum frequency peak LF and the maximum frequency peak HF of the frequency signal Fs. In this embodiment, 8 frequency intervals are defined between 500 Hz and 2000 Hz. The ranges of the eight frequency intervals are the same, but not limited thereto.

Then, as shown in step 307 , the processing unit 130 sets the s2 th to t2 th frequency intervals of the m frequency intervals as frequency sampling intervals, where 1<s2<t2<m. In this embodiment, let m=8, and assume that the minimum peak frequency LF falls between the third interval 875Hz-1062.5Hz, and the maximum frequency peak HF falls between the seventh interval 1625Hz-1812.5Hz. Therefore, s2=3, t2=7 can be set, and 875Hz-1812.5Hz is set as the frequency sampling interval.

Next, as shown in step 308, and refer to FIG. 6 . According to the frequency sampling interval, the sound to be sampled is sampled. That is, the part of the frequency signal SF to be sampled corresponding to the frequency of the sound to be sampled located in the frequency sampling interval is sampled.

In addition, between step 304 and step 305, filtering the frequency signal SF to be sampled corresponding to the sound to be sampled is filtered by a bandpass filter. The frequency range of the band-pass filter can be set between 100Hz and 4000Hz.

In this embodiment, steps 301-304 sample the volume part, and steps 305-308 sample the frequency part. In fact, the processing unit 130 can sample the volume and the frequency simultaneously or separately, so steps 305-308 can be performed first, and then steps 301-304 can be performed, and the present invention is not limited thereto.

In this embodiment, by setting a more accurate sampling range, the volume and frequency characteristics of the user can be captured more accurately, and the main vocal characteristics of the user can be preserved.

The audio signal processing method disclosed in the above-mentioned embodiments of the present invention can make an appropriate sampling range according to the user's vocalization characteristics, and filter out environmental noise. Since the sampling range can be adjusted according to different users, users with special vocal characteristics can also use this function to filter out environmental noise.

To sum up, although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which the present invention belongs can make various changes and improvements without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be determined by what is defined by the claims.

Claims (20)

1. A sound signal processing method, comprising: (a) Obtain a voltage signal according to the volume of the preset sound; (b) defining a volume sampling interval according to the minimum voltage peak value and the maximum voltage peak value of the voltage signal; and (c) Sampling the sound to be sampled according to the volume sampling interval. 2. The method according to claim 1, further comprising: (d) Obtain a frequency signal according to the frequency of the preset sound; (e) defining a frequency sampling interval according to the minimum frequency peak and the maximum frequency peak of the frequency signal; and (f) Sampling the sound to be sampled according to the frequency sampling interval. 3. The method according to claim 2, characterized in that after the step (c), and before the step (d): (g) Filtering the to-be-sampled frequency signal corresponding to the to-be-sampled sound with a band-pass filter. 4. The method according to claim 3, characterized in that the frequency range of the bandpass filter is between 100 Hz and 4000 Hz. 5. A sound signal processing method, comprising: (a) Obtain a frequency signal according to the frequency of the preset sound; (b) defining a frequency sampling interval based on the minimum frequency peak and maximum frequency peak of the frequency signal; and (c) Sampling the sound to be sampled according to the frequency sampling interval. 6. The method of claim 5, further comprising: (d) Obtain a voltage signal according to the volume of the preset sound; (e) defining a volume sampling interval according to the minimum voltage peak and the maximum voltage peak of the voltage signal; and (f) Sampling the sound to be sampled according to the volume sampling interval. 7. method according to claim 5, is characterized in that before step (a) also comprises: (g) Filtering the to-be-sampled frequency signal corresponding to the to-be-sampled sound with a band-pass filter. 8. The method according to claim 7, characterized in that the frequency range of the band-pass filter is between 100 Hz and 4000 Hz. 9. A sound signal processing method, comprising: (a) Obtain a voltage signal according to the volume of the preset sound; (b) defining n voltage intervals according to the minimum voltage peak value and the maximum voltage peak value of the voltage signal; (c) setting the s1th to t1th voltage intervals of the n voltage intervals as volume sampling intervals, where 1<s1<t1<n; and (d) Sampling the sound to be sampled according to the volume sampling interval. 10. The method according to claim 9, characterized in that the ranges of the n voltage intervals are the same. 11. The method of claim 9, further comprising: (e) Obtain a frequency signal according to the frequency of the preset sound; (f) defining m frequency intervals according to the minimum frequency peak and the maximum frequency peak of the frequency signal; (g) setting the s2th to t2th frequency intervals of the m frequency intervals as frequency sampling intervals, where 1<s2<t2<m; and (h) Sampling the sound to be sampled according to the frequency sampling interval. 12. The method according to claim 11, characterized in that the ranges of the m frequency intervals are the same. 13. The method according to claim 11, characterized in that after the step (d), and before the step (e), also comprising: (i) Filter the frequency signal to be sampled corresponding to the sound to be sampled with a bandpass filter. 14. The method according to claim 13, characterized in that the frequency range of the band-pass filter is between 100 Hz and 4000 Hz. 15. A sound signal processing method, comprising: (a) Obtain a frequency signal according to the frequency of the preset sound; (b) defining m frequency intervals according to the minimum frequency peak and the maximum frequency peak of the frequency signal; (c) setting the s2th to t2th frequency intervals of the m frequency intervals as frequency sampling intervals, where 1<s2<t2<m; and (d) Sampling the sound to be sampled according to the frequency sampling interval. 16. The method according to claim 15, characterized in that the ranges of the m frequency intervals are the same. 17. The method of claim 15, further comprising: (e) Obtain a voltage signal according to the volume of the preset sound; (f) defining n voltage intervals according to the minimum voltage peak value and the maximum voltage peak value of the voltage signal; (g) setting the s1th to t1th voltage intervals of the n voltage intervals as voltage sampling intervals, where 1<s1<t1<n; and (h) Sampling the sound to be sampled according to the voltage sampling interval. 18. The method according to claim 17, wherein the ranges of the n voltage intervals are the same. 19. The method according to claim 15, further comprising: before step (a): (i) Filter the frequency signal to be sampled corresponding to the sound to be sampled with a bandpass filter. 20. The method according to claim 19, characterized in that the frequency range of the band-pass filter is between 100 Hz and 4000 Hz.

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