TWI525608B - Dynamic sound effect equalization system and method thereof - Google Patents

Description

Dynamic sound equalization system and method thereof

The present invention relates to a system, and more particularly to a system and method for dynamic sound equalization.

The application of the sound effect equalization used in general audio is only to compensate for the quality of different broadcasting devices, or to adjust the frequency proportion of different playback modes and situations. No matter what kind of sound effect equalization application, it is the installation control. The panel is on the audio device, but there is currently no application for the sound effect equalization of the sound waves received by the radio device.

On the other hand, when equalizing the sound effects, it is necessary to manually judge the use of different broadcasting devices or to create different situational requirements to adjust the parameters of the sound processing. It takes a lot of manpower and time cost to install and use; The advantages and disadvantages of sound effects are subjective judgments of individuals. Different operators may not be the same after judging the adjustment results. There is a lack of reference standards when adjusting sound effects, resulting in the need to spend time and manpower if you want to change the broadcast equipment used. Adjustments are quite inconvenient in implementation.

At present, the sound of the sound in the market is large in the way of sound effect equalization. It can be divided into mechanical and microcomputer controlled; mechanical type needs to set the adjustment knob and scale according to different frequency bands on the control panel, while the microcomputer control type requires a small amount of adjustment switch button, but it must be added with a small size. The display is used to display the adjusted frequency band and scale; the common point of both is that a large amount of mold cost is required in the manufacturing stage, and the space of the overall audio device is not small, resulting in an increase in production cost.

Therefore, how can the sound effect equalization process be directly performed on the sound receiving device on the sound pickup device, and it is automatically determined whether or not the sound wave is subjected to the instant sound equalization process, and the parameters of the sound effect equalization are automatically adjusted, thereby not only preventing the sound effect equalization result from being different from person to person Moreover, it is possible to save the space of the hardware of the mechanism for the sound effect equalization, thereby reducing the space of the audio device and reducing the production cost, which is one of the current important research and development topics, and has become an urgent need for improvement in related fields.

One aspect of the present invention is to provide a dynamic sound equalization system to solve the problems of the prior art.

In one embodiment, the sound effect equalization system provided by the present invention includes a calculator, a comparator, and a processor. When the sound pickup device obtains the response characteristics of the sound wave, the calculator analyzes and calculates at least one noise-to-noise frequency energy ratio of the sound wave in at least one frequency band; when the signal-to-noise frequency energy ratio in some frequency bands reaches the processing threshold value, the comparator uses To calculate and compare the similarity between the signal-to-noise frequency-to-energy ratio and the standard reference model; the processor uses the sound effect equalization of the sound waves in these frequency bands according to the similarity.

In one embodiment, the acoustic wave response characteristics in the acoustic equalization system are amplitude changes of the acoustic wave and spectral responses.

In one embodiment, the noise-to-noise frequency energy ratio in the sound equalization system is the ratio of the sound wave to the frequency energy of the background noise in at least one frequency band.

In an embodiment, the standard reference model in the sound equalization system pre-acquires the standard amplitude variation of the standard sound wave and the standard spectral response by the sound pickup device, and analyzes and calculates the standard noise-to-frequency energy ratio of the standard sound wave and the background noise frequency energy. .

In an embodiment, the standard sound wave in the sound equalization system may be white noise, pink noise or gray noise.

On the other hand, in an embodiment, the sound effect equalization method provided by the present invention includes: when the sound pickup device obtains a response characteristic of the sound wave, analyzing and calculating at least one noise frequency energy ratio of the sound wave in at least one frequency band; When the signal-to-noise frequency energy ratio in the frequency band reaches the processing threshold, the similarity between the noise-to-noise frequency energy ratio and the standard reference model is calculated and compared; the sound wave is subjected to the instant sound equalization according to the similarity in the frequency band.

In one embodiment, the acoustic wave response in the acoustic equalization method is characterized by amplitude variation of the acoustic wave and spectral response.

In one embodiment, the noise-to-noise frequency energy ratio in the sound equalization method is the ratio of the sound wave to the frequency energy of the background noise in at least one frequency band.

In an embodiment, the standard reference model in the sound equalization method obtains the standard amplitude variation of the standard sound wave and the standard spectrum in advance by the sound pickup device. The standard signal-to-noise frequency-energy ratio of the frequency energy of the standard sound wave and the background noise is analyzed, analyzed, and calculated.

In one embodiment, the standard sound waves in the sound equalization method are white noise, pink noise, or gray noise.

In summary, the technical solution of the present invention has obvious advantages and beneficial effects compared with the prior art. With the above technical solution, considerable technological progress can be achieved, and the industrial use value is widely used. The advantage is that the sound wave can be directly processed on the sound receiving device, and the sound wave can be automatically determined. Processing, and automatically adjusting the parameters of the sound effect equalization, not only can avoid the sound effect equalization results vary from person to person, and can save the mold space of the mechanical hardware for the sound effect equalization processing, thereby reducing the space of the audio device and reducing the production cost. .

110‧‧‧Calculator

120‧‧‧ aligner

130‧‧‧Processor

210‧‧‧Audio device

310‧‧‧Sonic

410‧‧‧Standard Sound Wave

610, 620, 631, 632, 640~670‧‧ steps

The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; 2 is a flow chart of a method of equalizing sound effects in accordance with an embodiment of the present invention.

In order to make the description of the present invention more complete and complete, reference is made to the accompanying drawings and the accompanying drawings. On the other hand, well-known components and steps are not It is described in the examples to avoid unnecessarily limiting the invention.

The invention performs the instant sound equalization processing on the sound waves received by the sound receiving device, and the instant sound equalization processing can be applied to the long distance radio microphone; since the sound wave is emitted from the sound source, in the process of transmitting to the long distance radio microphone, Because the air resistance causes a certain degree of attenuation, and the sound wave may contain at least one frequency band, the attenuation degrees of different frequency bands are also different. For example, the sound wave attenuation at a relatively low frequency is small, and the sound wave attenuation at a relatively high frequency is relatively large. Therefore, the composition of the energy of the sound wave in each frequency band will be different due to the distance of the transmission distance, and the listener's overall feeling content is also different. Therefore, the adjustment parameters for the sound effect processing in different frequency bands are also different.

For example, a long-distance radio microphone receives a mobile sound source, and the distance between the sound source and the long-distance radio microphone is near and far because the sound source moves. When the sound source is at a long distance, the sound wave passes through the air, and the energy is due to the air. The resistance causes more attenuation, the air resistance that causes the sound waves to attenuate and other external noises (such as other sound waves from different sound sources) are collectively referred to herein as background noise, and the noise-to-noise frequency-energy ratio of the sound waves (ie, the sound frequency and energy of the sound source) The background noise frequency energy ratio) will decrease, which means that the sound waves received by the long-distance radio microphone are closer to the background noise, even when the sound source is longer than the long-distance radio microphone, the sound range of the long-range radio microphone or the sound source energy. After too few hours, the content perceived by the remote source is unclear and may not be heard. Conversely, when the source is close, that is, the source is within a very close range of the long distance microphone. , the sound wave received by the long-distance radio microphone Very close to the sound waves emitted by the sound source, the content of the sound source will be clear to the listener.

In view of the above, the present invention can perform instant sound equalization processing on the sound waves received by the sound receiving device, and no matter how the distance between the user and the sound receiving device changes, the listener can feel the sound receiving device through the instant dynamic sound equalization processing. The sound effect at the speaker's mouth.

1 is a schematic diagram of a sound effect equalization system in accordance with an embodiment of the present invention. Referring to FIG. 1, in the present embodiment, the sound effect equalization system provided by the present invention includes a calculator 110, a comparator 120, and a processor 130. The calculator 110 is coupled to the receiving device 210, the comparator 120 is coupled to the calculator 110, and the processor 130 is coupled to the comparator 120. In practice, the foregoing embodiments of the calculator 110, the comparator 120, and the processor 130 may be software programs or hardware circuits. Those skilled in the art should flexibly select their implementation manners at that time, without For software programs or all hardware circuits, some are software programs or some are hardware circuits.

After the sound wave 310 is emitted from the sound source, the sound wave 310 is attenuated by the air resistance during the process of transmitting the air to the sound collecting device 210. When the sound wave 310 is transmitted to the sound collecting device 210, the background noise is mixed. The sound equalization system analyzes the response characteristics of the sound wave 310 obtained by the sound pickup device 210 (eg, the amplitude, frequency, etc. of the sound wave 310 in at least one frequency band), and calculates the sound wave 310 in each frequency band. The signal to noise frequency energy ratio. Therefore, after the radio device 210 obtains the response characteristic of the acoustic wave 310, the calculator 110 in the audio equalization system analyzes and calculates at least one noise of the acoustic wave 310 in at least one frequency band. Frequency energy ratio. When the sound source is farther from the sound collecting device 210 and exceeds the sound receiving range of the sound receiving device 210 itself, or the sound source energy is too small, the signal-to-noise frequency energy ratio of the sound wave 310 in some frequency bands will be less than a certain value (for example, 0.5). Judging by common sense, the sound waves 310 received by the sound pickup device 210 in these frequency bands are meaningless or unnecessary, so the sound effect equalization system does not perform sound equalization for these frequency bands.

Alternatively, when the sound source is within a very close range from the sound collecting device 210, for example, the sound source is very close to the sound collecting device 210, the energy attenuation of the sound wave 310 is small, and the listener can clearly feel the sound source, and the sound wave 310 is in some frequency bands. The noise frequency energy ratio will be greater than a certain value (eg, 5), and the sound wave 310 received by the sound pickup device 210 in these frequency bands is in principle close to the sound source, so the sound equalization system does not have to be directed to these frequency bands. Sound effects are equalized. In order to make the sound effect equalization system only for the frequency band 310 (such as: the sound signal frequency energy ratio of the sound wave 310 is greater than 0.5 and less than 5), the sound effect equalization process is performed, so that the sound effect equalization system is used. The signal-to-noise frequency energy ratio of the sound wave 310 is set to a processing threshold, and the sound effect equalization system calculates the noise-to-noise frequency-energy ratio of the sound wave 310, and then uses the standard reference model preset in the sound effect equalization system as a reference reference. The noise-to-noise frequency energy ratio of the sound wave 310 in the processing threshold is compared with a standard reference model to determine the similarity to determine the degree to which the sound effect equalization system compensates the sound wave 310 in these frequency bands, that is, the sound effect equalization; when the sound wave 310 The higher the similarity between the signal-to-noise frequency energy ratio and the standard reference model, the less the compensation for the acoustic wave equalization system needs to be compensated for the acoustic wave 310. Conversely, the lower the similarity between the signal-to-noise frequency energy ratio of the acoustic wave 310 and the standard reference model. Representative The more the sound equalization system needs to compensate for the sound wave 310.

When the signal-to-noise frequency energy ratio of the acoustic wave 310 in some frequency bands reaches the processing threshold, the comparator 120 in the sound equalization system calculates and compares the noise-to-noise frequency energy ratio of the acoustic wave 310 in certain frequency bands. The similarity of the standard reference model; and the processor 130 in the sound equalization system is used to perform the sound equalization equalization of the acoustic wave 310 in certain frequency bands according to the similarity.

In an embodiment, the sound receiving device 210 in the sound equalization system may be an omni-directional microphone, a uni-directional microphone or a bi-directional microphone. The omnidirectional microphone has the same sensitivity for sound sources from different angles. It is common in recording projects that need to record the entire ambient sound source, or when the sound source is moving, it is hoped to maintain good sound. The speaker is wearing it during the speech. The lavalier microphone is also the same; the unidirectional microphone has the best sound for the sound source from the front of the microphone, while the sound source from other directions is attenuated, commonly used in handheld microphones and karaoke occasions; The microphone can accept sound sources from the front and the back of the microphone. There are not many applications for direct use, and most of them are used for special purposes such as stereo recording.

Taking an omnidirectional microphone as an example, in an embodiment, the processing threshold for setting the sound effect equalization in the sound equalization system is: the signal-to-noise frequency energy ratio of the sound wave 310 is greater than 0.5 and less than 5; if the current omnidirectional microphone receives When the sound wave frequency energy ratio of the sound wave 310 in some frequency bands is not in the processing threshold (that is, the signal-to-noise frequency energy ratio of the sound wave 310 is greater than 5 or less than 0.5), it is determined that the sound wave 310 of the frequency bands is not required to be sounded. Equalization If the noise-to-noise frequency energy ratio of the acoustic wave 310 received by the omnidirectional microphone in some frequency bands is within the processing threshold (ie, the signal-to-noise frequency energy ratio of the acoustic wave 310 is greater than 0.5 and less than 5), then the determination is made. The sound wave equalization of the sound waves 310 in these frequency bands is required to correct the sound quality changes caused by the distance between the sound source and the omnidirectional microphone.

In one embodiment, the response characteristic of the acoustic wave 310 in the acoustic equalization system is the amplitude variation and spectral response of the acoustic wave 310. The sound source is composed of a plurality of sound waves 310 of different amplitudes and spectra in at least one frequency band. Sound waves 310 of different amplitudes allow the listener to feel the sound volume of the sound source, and the spectrum in the response characteristics of the sound wave 310 reflects the sound color of the sound source. .

In one embodiment, the noise-to-noise frequency energy ratio in the sound equalization system is the ratio of the frequency energy of the sound wave 310 to the background noise in at least one frequency band. Since the acoustic wave 310 has individual reaction characteristics in each frequency band (possibly one or several, depending on different sound sources), the acoustic wave 310 has a signal-to-noise frequency energy ratio of each frequency band in each frequency band.

A standard reference model pre-set in the sound equalization system, the standard reference model is a reference reference for judging whether or not the sound effect is equalized for the sound wave 310, and the standard reference model is analyzed and calculated from a sound wave that can be obtained in advance. The standard sound wave 410 is defined as a standard sound wave 410. In an embodiment, the standard reference model in the sound equalization system obtains the standard amplitude variation and the standard spectral response of the standard sound wave 410 in advance by the sound pickup device 210, and analyzes and calculates the standard sound wave 410 and the background noise. The standard signal-to-noise frequency-energy ratio of the frequency energy is the standard reference model in the sound equalization system.

In one embodiment, the standard sound wave 410 in the sound equalization system can be white noise, pink noise, or gray noise. For example, since white noise is uniform in all frequency energy in the complete spectrum, it is often used as an input signal for the audio synthesis, so white noise can be generated by the white noise manufacturing machine, and white noise is used as a standard. The sound wave 410; the sound wave characteristics of the white noise are recorded in advance by the sound receiving device 210, and the noise-to-noise frequency energy ratio of the sound wave characteristics of the white noise in each frequency band and the background noise is calculated, and the noise-to-noise frequency energy ratio is set to be equal to the sound effect. The standard noise-to-noise frequency-energy ratio in the system. The standard noise-to-noise frequency-energy ratio of this white noise in each frequency band is the standard reference model in the audio equalization system. In another embodiment, the sound wave characteristics of pink noise or gray noise can be recorded in advance by the sound receiving device 210, and pink noise or gray noise is used as the standard sound wave 410; pink noise or gray noise is calculated as noise noise in each frequency band. The frequency-to-energy ratio is set to the standard noise-to-noise frequency energy ratio in the sound equalization system. The standard noise-to-noise frequency-energy ratio is the standard reference model in the sound equalization system.

2 is a flow chart of a method of equalizing sound effects in accordance with an embodiment of the present invention. Referring to FIG. 2, in an embodiment, in step 631, a response characteristic of the sound wave is obtained by the sound pickup device; and in step 632, at least one noise frequency energy ratio of the sound wave in the at least one frequency band is analyzed and calculated; In step 640, it is determined whether the signal-to-noise frequency energy ratio in each frequency band included in the sound wave reaches a processing threshold. When the signal-to-noise frequency energy ratio in some frequency bands reaches a processing threshold, in step 660, the sound wave is calculated and compared. The signal-to-noise frequency energy ratio in these frequency bands is similar to the standard reference model; in step 670, the sound waves are immediately applied in these frequency bands according to the similarity The process of equalizing the sound effect; if, in step 640, after the judgment, the signal-to-noise frequency energy ratio of the sound wave in some frequency bands does not reach the processing threshold value, as shown in step 650, the sound waves in the frequency bands are not subjected to sound effects, etc. Processing.

In an embodiment, the sound receiving device in the sound equalization method is an omnidirectional microphone, a unidirectional microphone or a bidirectional microphone; taking an omnidirectional microphone as an example, if the sound wave received by the omnidirectional microphone is currently When the signal-to-noise frequency-energy ratio of some frequency bands is not within the processing threshold, it is determined that the sound waves of these frequency bands are not required to be treated for equalization of sound waves, and vice versa, it is determined that sound waves are equalized for the sound waves of these frequency bands to correct the sound source. The change in sound quality caused by the change in distance from the omnidirectional microphone.

In one embodiment, the acoustic wave response in the sound equalization method is characterized by amplitude variation and spectral response of the acoustic wave; the sound source is composed of sound waves of different amplitudes and spectra in at least one frequency band, and sound waves of different amplitudes are allowed to listen. The sound of the sound source is felt, and the spectrum in the response characteristics of the sound wave reflects the sound of the sound source.

In one embodiment, the noise-to-noise frequency energy ratio in the sound equalization method is the ratio of the sound wave to the frequency energy of the background noise in at least one frequency band; since the sound wave is in each frequency band (possibly one or several, There are individual response characteristics in different frequency sources, so the sound wave has the signal-to-noise frequency-energy ratio of each frequency band in each frequency band.

In an embodiment, the standard reference model preset in the sound effect equalization method is a reference reference for determining whether the sound effect is equalized for the sound wave, and the standard reference model is analyzed and calculated from a pre-acquisition The sound wave is defined herein as a standard sound wave; please refer to FIG. 2, in step 610, the standard amplitude variation of the standard sound wave and the standard spectrum response are obtained in advance by the sound pickup device, and in step 620, the standard sound wave is analyzed and calculated. The ratio of the standard signal-to-noise frequency energy of the frequency energy of the frequency band to the background noise is used as a standard reference model in the sound equalization method; in step 640, when the signal-to-noise frequency energy ratio of the sound wave in some frequency bands reaches the processing threshold value In step 660, the standard reference model is used as a reference reference, and the similarity between the signal-to-noise frequency energy ratio in the frequency bands and the standard reference model is calculated and compared. In step 670, the similarity is used in the frequency bands. Instantaneous sound equalization of sound waves.

In an embodiment, the standard sound wave in the sound equalization method is white noise, pink noise or gray noise; the sound wave characteristics of the standard sound wave are recorded in advance by the sound receiving device, and the sound wave characteristics and background of the standard sound wave in each frequency band are calculated. The noise-to-noise frequency-energy ratio of the noise is set to the standard noise-to-noise frequency energy ratio in the sound equalization system. The standard sound-to-noise frequency-energy ratio of the standard sound wave in each frequency band is the sound equalization system. Standard reference model in .

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

110‧‧‧Calculator

120‧‧‧ aligner

130‧‧‧Processor

210‧‧‧Audio device

310‧‧‧Sonic

410‧‧‧Standard Sound Wave

Claims (10)

A sound effect equalization system comprising: a calculator for obtaining a response characteristic of a sound wave when a sound receiving device analyzes and calculates at least one noise frequency energy ratio of the sound wave in at least one frequency band; When a ratio of the signal-to-noise frequency energy in the frequency bands reaches a processing threshold, calculating and comparing the energy ratio of the signal-to-noise frequency to one of a standard reference model; and a processor for The similarity is subjected to instant sound equalization processing of the sound wave in the frequency bands. The sound effect equalization system of claim 1, wherein the response characteristic of the sound wave is an amplitude change and a spectral response of the sound wave. The sound effect equalization system of claim 1, wherein the noise-to-noise frequency energy ratio is a ratio of the sound wave to a frequency energy of a background noise in the frequency bands. The sound effect equalization system according to claim 1, wherein the standard reference model obtains a standard amplitude variation and a standard spectrum response of a standard sound wave in advance, and analyzes and calculates the frequency of the standard sound wave and the background noise. One of the standard noise signal frequency energy ratios. The sound effect equalization system of claim 4, wherein the standard sound wave is a white noise, a pink noise or a gray noise. An audio equalization method includes: when a radio device obtains a response characteristic of an acoustic wave, analyzes and calculates at least one signal-to-noise frequency energy ratio of the sound wave in at least one frequency band; and the signal-to-noise frequency energy in the frequency bands When the ratio is greater than a processing threshold, the ratio is calculated to be similar to one of the standard reference models; and the sound is equalized and equalized in the frequency bands according to the similarity. The sound effect equalization method according to claim 6, wherein the response characteristic of the sound wave is an amplitude change and a spectral response of the sound wave. The sound effect equalization method of claim 6, wherein the noise-to-noise frequency energy ratio is a ratio of the sound wave to a frequency energy of a background noise in the frequency bands. The sound effect equalization method according to claim 6, wherein the standard reference model obtains a standard amplitude variation and a standard spectrum response of a standard sound wave in advance, and analyzes and calculates the frequency of the standard sound wave and the background noise. One of the standard noise signal frequency energy ratios. The sound effect equalization method according to claim 9, wherein the standard sound wave is a white noise, a pink noise or a gray noise.