CN110213695A - Improve the method and intelligent sound reinforcement system of the output audio signal-to-noise ratio of sound reinforcement system - Google Patents
Improve the method and intelligent sound reinforcement system of the output audio signal-to-noise ratio of sound reinforcement system Download PDFInfo
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Abstract
The invention discloses a kind of methods of output audio signal-to-noise ratio for improving sound reinforcement system, this method comprises: receiving the first access of sound pick-up and the audio analog signals of alternate path, plus and blowup is carried out to the first access audio analog signals respectively, low gain amplification is carried out to the alternate path audio analog signals；Analog/digital conversion obtains corresponding first access audio digital signals and alternate path audio digital signals；Judge whether the voltage of the first access audio digital signals is more than or equal to preset first voltage threshold value, it is transmitted to amplifier using the alternate path audio digital signals as audio output if being, is otherwise transmitted to amplifier using the first access audio digital signals as audio output.The present invention also provides a kind of intelligent sound reinforcement systems.Received source audio signal can be carried out gain by the present invention, obtain high s/n ratio, low total harmonic distortion and the stable final audio signal of signal strength.
Description
Technical Field
The invention relates to the technical field of sound amplification, in particular to a method for improving the output audio signal-to-noise ratio of a sound amplifying system and an intelligent sound amplifying system.
Background
At present, an audio receiver in an audio amplification system generally receives an audio analog signal in a mono mode; then, the audio analog signal is converted into an audio electric signal through an analog/digital conversion circuit; then amplifying the received audio electric signal through an amplifying circuit; finally, the amplified audio electric signal is converted into an audio amplifying audio analog signal through a digital/analog conversion circuit of the audio amplifier to be played. However, after such a sound reinforcement system receives a source audio signal with a relatively large signal power range, the audio signal with relatively large power is amplified while the audio signal with relatively small power in the source audio signal is amplified, and the audio signal with relatively large power easily damages speaker hardware in the sound reinforcement system; moreover, the obtained amplified audio electrical signal often has large total harmonic distortion and a low signal-to-noise ratio.
Disclosure of Invention
In view of this, the present invention provides a method for improving the output audio signal-to-noise ratio of a sound amplification system by a user and an intelligent sound amplification system, which can receive audio analog signals through two paths, namely a first path and a second path, of a sound pickup, and then respectively perform high-gain amplification on the audio analog signals of the first path and perform low-gain amplification on the audio analog signals of the second path; then, carrying out analog/digital conversion to obtain a corresponding first channel audio digital signal and a corresponding second channel audio digital signal; and then judging whether the voltage of the first-channel audio digital signal is greater than or equal to a preset first voltage threshold, if so, transmitting the first-channel audio digital signal to a loudspeaker as audio output, otherwise, transmitting the second-channel audio digital signal to the loudspeaker as audio output. Therefore, the received source audio signal can be gained, and the final audio signal with high signal-to-noise ratio, low total harmonic distortion and stable signal intensity is obtained.
First, to achieve the above object, the present invention provides a method for improving the output audio signal-to-noise ratio of a sound amplification system, where the method is applied to the sound amplification system, and the method includes:
acquiring an audio analog signal at least comprising a first path and a second path through a sound pick-up; carrying out high-gain amplification on the first channel audio frequency analog signal, and carrying out low-gain amplification on the second channel audio frequency analog signal; respectively carrying out analog-to-digital conversion on the amplified first channel audio analog signal and the amplified second channel audio analog signal to obtain a first channel audio digital signal and a second channel audio digital signal; judging whether the voltage of the audio digital signal of the first channel is greater than or equal to a preset first voltage threshold value or not; when the voltage of the first-channel audio digital signal is smaller than a preset first voltage threshold value, the first-channel audio digital signal is transmitted to a loudspeaker as audio output; otherwise, the second channel audio digital signal is transmitted to the loudspeaker as an audio output.
Optionally, the high-gain amplification includes a high-gain multiple M and a dynamic gain H, the low-gain amplification includes a low-gain multiple N and a dynamic gain H, and the multiple of the dynamic gain H is set to be in an adjustable state, so as to provide the user with automatic dynamic range adjustment.
Optionally, the high gain factor M of the high gain amplification is the sum of the main gain amplification factor of the acoustic amplification system and the optimal amplification factor of the low harmonic distortion; wherein the main gain amplification is used to coordinate the microphone and the speaker of the sound amplification system to a neutral gain of 0db, and the low harmonic distortion optimum amplification is used to reduce the total harmonic distortion of the sound amplification system to a minimum.
Optionally, the method further comprises the step of: acquiring a maximum input voltage measured value of a sound pick-up and a maximum output voltage measured value of a loudspeaker, and calculating the voltage loss of internal hardware of a sound amplification system, wherein the voltage loss value is the difference value between the maximum input voltage measured value of the sound pick-up and the maximum output voltage measured value of the loudspeaker; setting the "voltage loss" as a main gain amplification factor of the sound amplification system.
Optionally, before the first channel audio digital signal or the second channel audio digital signal is delivered to a speaker as an audio output, the method further comprises the steps of: gain adjustment and bias adjustment are performed on the audio output.
Optionally, after the step of "passing the second channel audio digital signal as audio output to a loudspeaker", further comprising the steps of: judging whether the voltage of the audio digital signal of the first channel is smaller than a preset second voltage threshold value or not; when the voltage of the first-channel audio digital signal is smaller than a preset second voltage threshold value, the first-channel audio digital signal is transmitted to the loudspeaker as audio output again; then, continuously judging whether the voltage of the audio digital signal of the first channel is greater than or equal to a preset first voltage threshold value; when the voltage of the first-channel audio digital signal is less than the first voltage threshold, passing the first-channel audio digital signal as an audio output to a loudspeaker; when the voltage of the first-pass audio digital signal is greater than or equal to the first voltage threshold, passing the first-pass audio digital signal as an audio output to a loudspeaker.
In addition, in order to achieve the above object, the present invention further provides an intelligent sound reinforcement system, including:
a sound pickup for acquiring an audio analog signal including at least a first path and a second path; the amplifying unit is used for carrying out high-gain amplification on the first channel audio frequency analog signal and carrying out low-gain amplification on the second channel audio frequency analog signal; the analog/digital conversion unit is used for respectively carrying out analog/digital conversion on the amplified first channel audio analog signal and the amplified second channel audio analog signal to obtain a first channel audio digital signal and a second channel audio digital signal; the digital audio processor is used for judging whether the voltage of the audio digital signal of the first channel is greater than or equal to a preset first voltage threshold value or not; when the voltage of the first-channel audio digital signal is smaller than a preset first voltage threshold value, the first-channel audio digital signal is transmitted to a loudspeaker as audio output; otherwise, the second channel audio digital signal is transmitted to the loudspeaker as an audio output.
Optionally, the amplifying unit includes a high-gain amplifying unit for performing high-gain amplification, and a low-gain amplifying unit for performing low-gain amplification, where the high-gain amplifying unit and the low-gain amplifying unit are both two-stage amplification; wherein: the high gain amplification comprises a high gain multiple M and a dynamic gain H, the low gain amplification comprises a low gain multiple N and a dynamic gain H, and the multiple of the dynamic gain H is set to be in an adjustable state and used for providing a user with automatic dynamic range adjustment.
Optionally, the high gain factor M of the high gain amplification is the sum of the main gain amplification factor of the acoustic amplification system and the optimal amplification factor of the low harmonic distortion; wherein the main gain amplification is used to coordinate the microphone and the speaker of the sound amplification system to a neutral gain of 0db, and the low harmonic distortion optimum amplification is used to reduce the total harmonic distortion of the sound amplification system to a minimum.
Optionally, the digital audio processor is further configured to: judging whether the voltage of the audio digital signal of the first channel is smaller than a preset second voltage threshold value or not; when the voltage of the first-channel audio digital signal is smaller than a preset second voltage threshold value, the first-channel audio digital signal is transmitted to the loudspeaker as audio output again; then, continuously judging whether the voltage of the audio digital signal of the first channel is greater than or equal to a preset first voltage threshold value; when the voltage of the first-channel audio digital signal is less than the first voltage threshold, passing the first-channel audio digital signal as an audio output to a loudspeaker; when the voltage of the first-pass audio digital signal is greater than or equal to the first voltage threshold, passing the first-pass audio digital signal as an audio output to a loudspeaker.
Compared with the prior art, the method for improving the output audio signal-to-noise ratio of the sound amplifying system and the intelligent sound amplifying system provided by the invention can receive the audio analog signals through the first channel and the second channel of the sound pick-up, and then respectively carry out high-gain amplification on the audio analog signals of the first channel and low-gain amplification on the audio analog signals of the second channel; then, carrying out analog/digital conversion to obtain a corresponding first channel audio digital signal and a corresponding second channel audio digital signal; and then judging whether the voltage of the first-channel audio digital signal is greater than or equal to a preset first voltage threshold, if so, transmitting the first-channel audio digital signal to a loudspeaker as audio output, otherwise, transmitting the second-channel audio digital signal to the loudspeaker as audio output. Therefore, the received source audio signal can be gained, and the final audio signal with high signal-to-noise ratio, low total harmonic distortion and stable signal intensity is obtained.
Drawings
Fig. 1 is a schematic diagram of an alternative organization architecture of the intelligent sound amplification system of the present invention;
FIG. 2 is a graph of total harmonic distortion test data for a first path audio electrical signal and a second path audio electrical signal at different amplification factors in an embodiment of the intelligent sound amplification system of the present invention;
fig. 3 is a schematic circuit block diagram of another embodiment of the intelligent sound amplifying system according to the present invention;
fig. 4 is a flowchart illustrating an embodiment of a method for improving an output audio snr of a sound reinforcement system according to the present invention.
The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the description relating to "first", "second", etc. in the present invention is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Fig. 1 is a schematic diagram of an alternative organization structure of the intelligent sound amplifying system according to the present invention.
In this embodiment, the intelligent sound amplifying system 1 may include, but is not limited to, a sound collector 10, an amplifying unit 20, an analog/digital converting unit 30, a digital audio processor 40, and a speaker (not shown in the figure) which may be connected to each other through a wireless network, bluetooth, or a power line; wherein the amplifying unit 20 comprises a high gain amplifying unit 21 and a low gain amplifying unit 22.
The sound pickup 10 is configured to acquire an audio analog signal including at least a first path and a second path.
In the present embodiment, the sound pickup 10 is configured to receive external audio analog signals through stereo channels, so that at least two channels of audio analog signals can be acquired. Generally, the audio analog signals of the two paths are substantially the same, and both retain the audio data of the source audio signal.
The amplifying unit 20 is configured to perform high-gain amplification on the first-path audio analog signal, and perform low-gain amplification on the second-path audio analog signal.
Specifically, the amplifying unit 20 includes a high-gain amplifying unit 21 configured to perform high-gain amplification, and a low-gain amplifying unit 22 configured to perform low-gain amplification, where the high-gain amplifying unit 21 and the low-gain amplifying unit 22 are both two-stage amplification, where the high-gain amplification includes a high-gain multiple M and a dynamic gain H, the low-gain amplification includes a low-gain multiple N and a dynamic gain H, and the multiple of the dynamic gain H is set to be in an adjustable state, and is used for providing a user with automatic dynamic range adjustment.
In this embodiment, the high gain factor M of the high gain amplification is the sum of the main gain amplification factor of the sound amplification system and the optimal amplification factor of the low harmonic distortion; wherein the main gain amplification is used to coordinate the microphone and the speaker of the sound amplification system to a neutral gain of 0db, and the low harmonic distortion optimum amplification is used to reduce the total harmonic distortion of the sound amplification system to a minimum.
In this embodiment, the audio devices are generally labeled with nominal parameters, e.g., the microphone will label the maximum input voltage measurement and the speaker will label the maximum output voltage measurement. A maximum input voltage measurement value of the sound pickup, that is, a maximum voltage measurement value of an audio electrical signal that can be output after an analog audio signal is converted into the audio electrical signal; and the maximum output voltage measurement of the speaker is the maximum voltage measurement of the speaker converting the audio electrical signal into an audio analog signal. Thus, the "voltage loss" is the difference between the maximum input voltage measurement of the microphone and the maximum output voltage measurement of the speaker. For example, when the maximum input voltage measurement of the microphone is 28.5dbu and the maximum output voltage measurement of the speaker differs by 18dbu, then the "voltage loss" is 28.5-18-10.5 dbu, i.e., there is a voltage loss of 10.5dbu for the sound amplification system. Thus, the main gain multiple of the sound amplification system is set to 10.5db according to the "voltage loss", thereby ensuring that the sound amplification system obtains a neutral gain of 0db from receiving the audio analog signal to outputting the audio analog signal, and a neutral gain of 0db ensures that the sound amplification system ensures a low signal-to-noise ratio.
In addition, there are harmonic distortion problems in audio devices in addition to the common noise problem. Harmonic is an electric quantity contained in a current and having a frequency that is an integral multiple of a fundamental wave, and generally refers to an electric quantity generated by performing fourier series decomposition on a periodic non-sinusoidal electric quantity and the remaining electric quantity being greater than the frequency of the fundamental wave. Harmonic components in the audio frequency are superimposed on the original signal wave, thereby causing distortion of the original signal wave.
Since the hardware of each audio device is different, the conditions for causing harmonic distortion are also different. In this embodiment, first, a gain range in which the acoustic amplification system can maintain a small harmonic distortion when amplifying an audio electrical signal is found out by means of actual measurement; and then finding out the amplification gain factor when the harmonic distortion is changed from small to large harmonic distortion, and taking the amplification gain factor as the optimal amplification factor of the low harmonic distortion.
Fig. 2 is a graph showing total harmonic distortion test data of the first-path audio electrical signal and the second-path audio electrical signal under different amplification factors according to the embodiment of the intelligent sound amplification system of the present invention, wherein the X-axis represents the amplification factor, and the Y-axis represents the total harmonic distortion. The application scenario of fig. 2 is: the amplification factor of the high-gain amplification unit in the amplification unit 20 is set to 10.5db, which is used for offsetting the voltage loss in the sound amplification system and ensuring 0db neutral output; the amplification factor of the low gain amplification unit is set to 0 db. As can be seen from fig. 3, the total harmonic distortion of the audio digital signal passing through the first path after high-gain amplification becomes steep after +9db amplification, and represents a large amount of distortion; while the audio digital signal via the low gain amplified second path exhibits a lower total harmonic distortion before 20 db. Therefore, it can be judged that the optimal amplification factor of the low harmonic distortion of the sound amplifying system is 9 db. That is, the high gain amplification of the high gain amplification unit is 10.5db +9db ═ 19.5 db. In the present embodiment, the second audio digital signal amplified via low gain is selected only when the first path audio digital signal amplified via high gain is judged to be higher than the first voltage threshold, and thus, in the present embodiment, the low gain multiple N of the low gain amplification unit is set to 0 db. Of course, in other embodiments, the low gain factor N may be set to other factors smaller than the high gain factor M.
The analog/digital conversion unit 30 is configured to perform analog/digital conversion on the amplified first-channel audio analog signal and the amplified second-channel audio analog signal respectively to obtain a first-channel audio digital signal and a second-channel audio digital signal.
The digital audio processor 40 is configured to determine whether a voltage of the first-path audio digital signal is greater than or equal to a preset first voltage threshold; when the voltage of the first-channel audio digital signal is smaller than a preset first voltage threshold value, the first-channel audio digital signal is transmitted to a loudspeaker as audio output; otherwise, the second channel audio digital signal is passed as an audio output to a speaker.
Specifically, the digital audio processor 40 determines whether the voltage of the first-path audio digital signal is greater than or equal to a preset first voltage threshold through a voltage comparison unit, where the first voltage threshold is set according to a rated voltage of the speaker. For example, if the rated voltage of the speaker is 30V, the first voltage threshold is set to a voltage value not greater than the rated voltage, such as 25V. Therefore, the voltage value of the short-time audio digital signal is prevented from being larger than the rated voltage of the loudspeaker, and the internal hardware of the loudspeaker is prevented from being damaged. Of course, after the voltage comparing unit in the digital audio processor 40 compares that the voltage value of the audio digital signal of the first path is greater than the first voltage threshold, the voltage comparing unit triggers the switch controlling the audio output end to jump from being connected to the first path to being connected to the second path, so as to transmit the audio digital signal of the second path to the speaker as the audio output.
Fig. 3 is a schematic circuit module diagram of another embodiment of the intelligent sound amplifying system according to the present invention.
In this embodiment, the digital audio processor (not shown) further includes two parts, namely, a bias adjustment part and a gain adjustment part. The bias adjustment is used to adjust the phase of the audio output from the bed bottom to the speaker so that each phase of the voltage waveform of the audio digital signal can maintain a synchronous gain amplification. The gain adjustment is used to perform a voltage gain on the audio output to be delivered to the speaker such that the voltage of the audio digital signal is numerically synchronized with the output voltage.
In addition, the digital audio processor can not only judge whether the voltage of the first-channel audio digital signal is greater than or equal to a preset first voltage threshold value; when the voltage of the first-channel audio digital signal is smaller than a preset first voltage threshold value, the first-channel audio digital signal is transmitted to a loudspeaker as audio output; otherwise, the second channel audio digital signal is transmitted to the loudspeaker as an audio output. Whether the voltage of the first-channel audio digital signal is smaller than a preset second voltage threshold value can also be judged; and when the voltage of the first-channel audio digital signal is smaller than a preset second voltage threshold value, the first-channel audio digital signal is transmitted to the loudspeaker as audio output again. Specifically, the voltage comparison unit shown in fig. 3 is provided with two voltage comparison circuits, one of the voltage comparison circuits is used for triggering and controlling the switch of the audio output end to jump from being connected with the first path to being connected with the second path when the voltage strength of the audio digital signal of the first path is greater than the first threshold value, so as to transmit the audio digital signal of the second path to the speaker as the audio output; and the other voltage comparison circuit is used for triggering and controlling the switch of the audio output end to jump from being connected with the second path to being connected with the first path when the voltage strength of the audio digital signal of the first path is compared to be smaller than a second voltage threshold value, so that the audio digital signal of the first path is transmitted to a loudspeaker as audio output.
As can be seen from the above, the intelligent sound reinforcement system 1 is capable of receiving audio analog signals through two paths, namely, a first path and a second path of a sound pick-up, and then performing high-gain amplification on the audio analog signals of the first path and performing low-gain amplification on the audio analog signals of the second path, respectively; then, carrying out analog/digital conversion to obtain a corresponding first channel audio digital signal and a corresponding second channel audio digital signal; and then judging whether the voltage of the first-channel audio digital signal is greater than or equal to a preset first voltage threshold, if so, transmitting the first-channel audio digital signal to a loudspeaker as audio output, otherwise, transmitting the second-channel audio digital signal to the loudspeaker as audio output. Therefore, the received source audio signal can be gained, and the final audio signal with high signal-to-noise ratio, low total harmonic distortion and stable signal intensity is obtained.
In addition, the invention also provides a method for improving the output audio signal-to-noise ratio of the sound amplifying system, and the method is applied to the sound amplifying system.
Fig. 4 is a schematic flow chart of a first embodiment of the method for improving the output audio signal-to-noise ratio of the sound reinforcement system according to the present invention. In this embodiment, the execution order of the steps in the flowchart shown in fig. 3 may be changed and some steps may be omitted according to different requirements.
Step S500, acquiring an audio analog signal including at least a first path and a second path through a sound pickup.
In this embodiment, the sound pickup is configured to receive the external audio analog signal through a stereo channel, so that the audio analog signals of at least two channels can be acquired. Generally, the audio analog signals of the two paths are substantially the same, and both retain the audio data of the source audio signal.
Step S502, performing high-gain amplification on the first-path audio analog signal, and performing low-gain amplification on the second-path audio analog signal.
Specifically, the amplifying unit of the sound amplifying system includes a high-gain amplifying unit for performing high-gain amplification, and a low-gain amplifying unit for performing low-gain amplification, where the high-gain amplifying unit and the low-gain amplifying unit are both two-stage amplification, the high-gain amplification includes a high-gain multiple M and a dynamic gain H, the low-gain amplification includes a low-gain multiple N and a dynamic gain H, and the multiple of the dynamic gain H is set to be in an adjustable state, and is used for providing a user with automatic dynamic range adjustment.
In this embodiment, the high gain factor M of the high gain amplification is the sum of the main gain amplification factor of the sound amplification system and the optimal amplification factor of the low harmonic distortion; wherein the main gain amplification is used to coordinate the microphone and the speaker of the sound amplification system to a neutral gain of 0db, and the low harmonic distortion optimum amplification is used to reduce the total harmonic distortion of the sound amplification system to a minimum.
In this embodiment, the audio devices are generally labeled with nominal parameters, e.g., the microphone will label the maximum input voltage measurement and the speaker will label the maximum output voltage measurement. A maximum input voltage measurement value of the sound pickup, that is, a maximum voltage measurement value of an audio electrical signal that can be output after an analog audio signal is converted into the audio electrical signal; and the maximum output voltage measurement of the speaker is the maximum voltage measurement of the speaker converting the audio electrical signal into an audio analog signal. Thus, the "voltage loss" is the difference between the maximum input voltage measurement of the microphone and the maximum output voltage measurement of the speaker. For example, when the maximum input voltage measurement of the microphone is 28.5dbu and the maximum output voltage measurement of the speaker differs by 18dbu, then the "voltage loss" is 28.5-18-10.5 dbu, i.e., there is a voltage loss of 10.5dbu for the sound amplification system. Thus, the main gain multiple of the sound amplification system is set to 10.5db according to the "voltage loss", thereby ensuring that the sound amplification system obtains a neutral gain of 0db from receiving the audio analog signal to outputting the audio analog signal, and a neutral gain of 0db ensures that the sound amplification system ensures a low signal-to-noise ratio.
In addition, there are harmonic distortion problems in audio devices in addition to the common noise problem. Harmonic is an electric quantity contained in a current and having a frequency that is an integral multiple of a fundamental wave, and generally refers to an electric quantity generated by performing fourier series decomposition on a periodic non-sinusoidal electric quantity and the remaining electric quantity being greater than the frequency of the fundamental wave. Harmonic components in the audio frequency are superimposed on the original signal wave, thereby causing distortion of the original signal wave. Since the hardware of each audio device is different, the conditions for causing harmonic distortion are also different. In this embodiment, first, a gain range in which the acoustic amplification system can maintain a small harmonic distortion when amplifying an audio electrical signal is found out by means of actual measurement; and then finding out the amplification gain factor when the harmonic distortion is changed from small to large harmonic distortion, and taking the amplification gain factor as the optimal amplification factor of the low harmonic distortion.
Therefore, the high gain factor of the high gain amplification unit is equal to the main gain factor + the low harmonic distortion optimal amplification factor. In this embodiment, the low gain multiple N of the low gain amplification unit is set to 0 db. Of course, in other embodiments, the low gain factor N may be set to other factors smaller than the high gain factor M.
Step S504, respectively performing analog-to-digital conversion on the amplified first channel audio analog signal and the amplified second channel audio analog signal to obtain a first channel audio digital signal and a second channel audio digital signal.
Step S506, determining whether the voltage of the first channel audio digital signal is greater than or equal to a preset first voltage threshold.
Step S508, when the voltage of the first channel audio digital signal is smaller than a preset first voltage threshold, transmitting the first channel audio digital signal to a loudspeaker as audio output; otherwise, the second channel audio digital signal is transmitted to the loudspeaker as audio output
Specifically, in step S506, a voltage comparison unit is used to determine whether the voltage of the first-channel audio digital signal is greater than or equal to a preset first voltage threshold, where the first voltage threshold is set according to a rated voltage of the speaker. For example, if the rated voltage of the speaker is 30V, the first voltage threshold is set to a voltage value not greater than the rated voltage, such as 25V. Therefore, the voltage value of the short-time audio digital signal is prevented from being larger than the rated voltage of the loudspeaker, and the internal hardware of the loudspeaker is prevented from being damaged. Step S508, after comparing that the voltage value of the audio digital signal of the first path is greater than the first voltage threshold value in step S506, triggers the switch controlling the audio output end to jump from being connected to the first path to being connected to the second path, so as to transmit the audio digital signal of the second path to the speaker as the audio output. Otherwise, the switch of the audio output end is not triggered to jump.
In addition, in other embodiments, the method for improving the signal-to-noise ratio of the output audio of the sound amplifying system further includes, before step S508, the step of performing gain adjustment and bias adjustment on the audio output. The bias adjustment is used to adjust the phase of the audio output from the bed bottom to the speaker so that each phase of the voltage waveform of the audio digital signal can maintain a synchronous gain amplification. The gain adjustment is used to perform a voltage gain on the audio output to be delivered to the speaker such that the voltage of the audio digital signal is numerically synchronized with the output voltage.
In summary, the method for improving the output audio signal-to-noise ratio of the sound reinforcement system provided by this embodiment can receive the audio analog signal through the first path and the second path of the sound pickup, and then respectively perform high-gain amplification on the audio analog signal of the first path and perform low-gain amplification on the audio analog signal of the second path; then, carrying out analog/digital conversion to obtain a corresponding first channel audio digital signal and a corresponding second channel audio digital signal; and then judging whether the voltage of the first-channel audio digital signal is greater than or equal to a preset first voltage threshold, if so, transmitting the first-channel audio digital signal to a loudspeaker as audio output, otherwise, transmitting the second-channel audio digital signal to the loudspeaker as audio output. Therefore, the received source audio signal can be gained, and the final audio signal with high signal-to-noise ratio, low total harmonic distortion and stable signal intensity is obtained.
In addition, the technical scheme of the invention improves the signal-to-noise ratio and greatly improves the signal dynamic range of the sound amplifying system in the process of amplifying the audio signal.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for improving the output audio signal-to-noise ratio of a sound amplifying system is applied to the sound amplifying system, and is characterized by comprising the following steps:
acquiring an audio analog signal at least comprising a first path and a second path through a sound pick-up;
carrying out high-gain amplification on the first channel audio frequency analog signal, and carrying out low-gain amplification on the second channel audio frequency analog signal;
respectively carrying out analog-to-digital conversion on the amplified first channel audio analog signal and the amplified second channel audio analog signal to obtain a first channel audio digital signal and a second channel audio digital signal;
judging whether the voltage of the audio digital signal of the first channel is greater than or equal to a preset first voltage threshold value or not;
when the voltage of the first-channel audio digital signal is smaller than a preset first voltage threshold value, the first-channel audio digital signal is transmitted to a loudspeaker as audio output; otherwise, the second channel audio digital signal is transmitted to the loudspeaker as an audio output.
2. The method for improving the signal-to-noise ratio of the output audio of the sound amplification system as set forth in claim 1, wherein:
the high-gain amplification comprises a high-gain multiple M and a dynamic gain H, the low-gain amplification comprises a low-gain multiple N and a dynamic gain H, and the multiple of the dynamic gain H is set to be in an adjustable state and used for providing a user with automatic dynamic range adjustment.
3. A method for improving the signal-to-noise ratio of the output audio of a sound amplification system as claimed in claim 1 or 2, characterized in that:
the high gain times M of the high gain amplification are the sum of the main gain amplification times of the sound amplifying system and the optimal amplification times of the low harmonic distortion; wherein,
the main gain amplification is used for coordinating the sound pick-up and the loudspeaker of the sound amplification system to be neutral gain of 0db, and the low harmonic distortion optimal amplification is used for reducing total harmonic distortion of the sound amplification system to be minimum.
4. A method for improving the signal-to-noise ratio of the output audio of a sound amplification system as claimed in claim 3, wherein the method further comprises the steps of:
acquiring a maximum input voltage measured value of a sound pick-up and a maximum output voltage measured value of a loudspeaker, and calculating the voltage loss of internal hardware of a sound amplification system, wherein the voltage loss value is the difference value between the maximum input voltage measured value of the sound pick-up and the maximum output voltage measured value of the loudspeaker;
setting the "voltage loss" as a main gain amplification factor of the sound amplification system.
5. The method for improving the output audio signal-to-noise ratio of a sound amplification system as claimed in claim 1, further comprising, before delivering the first-pass audio digital signal or the second-pass audio digital signal as audio output to a speaker, the steps of: gain adjustment and bias adjustment are performed on the audio output.
6. The method for improving the output audio signal-to-noise ratio of a sound amplification system as claimed in claim 1, further comprising, after the step of passing the second path audio digital signal as audio output to a sound amplifier, the steps of:
judging whether the voltage of the audio digital signal of the first channel is smaller than a preset second voltage threshold value or not;
when the voltage of the first-channel audio digital signal is smaller than a preset second voltage threshold value, the first-channel audio digital signal is transmitted to the loudspeaker as audio output again;
then, continuously judging whether the voltage of the audio digital signal of the first channel is greater than or equal to a preset first voltage threshold value;
when the voltage of the first-channel audio digital signal is less than the first voltage threshold, passing the first-channel audio digital signal as an audio output to a loudspeaker; when the voltage of the first-pass audio digital signal is greater than or equal to the first voltage threshold, passing the first-pass audio digital signal as an audio output to a loudspeaker.
7. An intelligent sound reinforcement system, characterized in that the intelligent sound reinforcement system comprises:
a sound pickup for acquiring an audio analog signal including at least a first path and a second path;
the amplifying unit is used for carrying out high-gain amplification on the first channel audio frequency analog signal and carrying out low-gain amplification on the second channel audio frequency analog signal;
the analog/digital conversion unit is used for respectively carrying out analog/digital conversion on the amplified first channel audio analog signal and the amplified second channel audio analog signal to obtain a first channel audio digital signal and a second channel audio digital signal;
the digital audio processor is used for judging whether the voltage of the audio digital signal of the first channel is greater than or equal to a preset first voltage threshold value or not; and
when the voltage of the first-channel audio digital signal is smaller than a preset first voltage threshold value, the first-channel audio digital signal is transmitted to a loudspeaker as audio output; otherwise, the second channel audio digital signal is transmitted to the loudspeaker as an audio output.
8. The intelligent sound amplification system of claim 7, wherein:
the amplification unit comprises a high-gain amplification unit and a low-gain amplification unit, wherein the high-gain amplification unit is used for carrying out high-gain amplification, the low-gain amplification unit is used for carrying out low-gain amplification, and the high-gain amplification unit and the low-gain amplification unit are both used for carrying out two-stage amplification; wherein:
the high gain amplification comprises a high gain multiple M and a dynamic gain H, the low gain amplification comprises a low gain multiple N and a dynamic gain H, and the multiple of the dynamic gain H is set to be in an adjustable state and used for providing a user with automatic dynamic range adjustment.
9. The intelligent sound amplification system of claim 8, wherein:
the high gain times M of the high gain amplification are the sum of the main gain amplification times of the sound amplifying system and the optimal amplification times of the low harmonic distortion; wherein,
the main gain amplification is used for coordinating the sound pick-up and the loudspeaker of the sound amplification system to be neutral gain of 0db, and the low harmonic distortion optimal amplification is used for reducing total harmonic distortion of the sound amplification system to be minimum.
10. The intelligent sound amplification system of claim 7, wherein the digital audio processor is further configured to:
judging whether the voltage of the audio digital signal of the first channel is smaller than a preset second voltage threshold value or not;
when the voltage of the first-channel audio digital signal is smaller than a preset second voltage threshold value, the first-channel audio digital signal is transmitted to the loudspeaker as audio output again;
then, continuously judging whether the voltage of the audio digital signal of the first channel is greater than or equal to a preset first voltage threshold value;
when the voltage of the first-channel audio digital signal is less than the first voltage threshold, passing the first-channel audio digital signal as an audio output to a loudspeaker; when the voltage of the first-pass audio digital signal is greater than or equal to the first voltage threshold, passing the first-pass audio digital signal as an audio output to a loudspeaker.
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