CN114125686A - Audio characteristic acquisition method, system and storage medium for sound source device - Google Patents
Audio characteristic acquisition method, system and storage medium for sound source device Download PDFInfo
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Abstract
The application relates to a method, a system and a storage medium for obtaining audio characteristics of a sound source device, wherein the method for obtaining the audio characteristics of the sound source device comprises the following steps: acquiring external noise signals simultaneously acquired by one or more audio receivers and audio signals of one or more sound source devices; carrying out frequency conversion on the external noise signal and the audio signal of the sound source device to obtain an external noise frequency curve corresponding to the audio receiver and audio characteristic curves corresponding to the sound source devices; denoising the audio characteristic curves corresponding to the sound source devices by using the external noise frequency curve to obtain denoised audio characteristic curves; and modifying the de-noising audio characteristic curve by utilizing a hardware audio characteristic curve of the audio receiver to obtain a finally modified audio characteristic curve of the sound source device. The sound source device adjusted by the method can be suitable for any audio receiver, so that listeners can obtain better listening feeling.
Description
Technical Field
The present invention relates to the field of acoustic measurement processing technologies, and in particular, to a method, a system, and a storage medium for obtaining audio characteristics of a sound source device.
Background
The traditional sound source device is easy to generate the distortion of a hardware unit in the production process due to the defects of the manufacturing process, and the sound amplification quality of the sound source device is influenced. The sound source device is compensated and optimized, and the sound field is balanced, so that the audio characteristics of the sound source device can be improved, the performance of the sound source device is improved, and a more real sound reproduction effect is obtained.
Frequency equalization is a method for compensating and modifying the output of a sound source device and sound field imperfections in an audio system. In the prior art, the sound field of a sound source device is modified by measuring the audio characteristics of the sound source device and adjusting the parameters of a frequency equalizer of the sound source device by using the audio characteristic curve of the sound source device. However, this technique has the following drawbacks: the accuracy of the audio characteristics of the obtained sound source device is still to be improved by using one audio receiver and two sound source devices for measurement, and even if the gain of the sound source device is adjusted according to the measurement result, the sound actually emitted by the sound source device is still uneven on the frequency spectrum, so that distortion is generated, and the human hearing is affected.
Disclosure of Invention
In order to improve the accuracy of the audio characteristics of a sound source device, the present application provides a method, a system and a storage medium for obtaining the audio characteristics of the sound source device.
In a first aspect, the present application provides a method for obtaining audio characteristics of a sound source device, which adopts the following technical solutions:
a method for obtaining audio characteristics of a sound source device comprises the following steps:
acquiring external noise signals simultaneously acquired by one or more audio receivers and audio signals of one or more sound source devices;
carrying out frequency conversion on the external noise signal and the audio signal of the sound source device to obtain an external noise frequency curve corresponding to the audio receiver and audio characteristic curves corresponding to the sound source devices;
denoising the audio characteristic curves corresponding to the sound source devices by using the external noise frequency curve to obtain denoised audio characteristic curves;
and modifying the de-noising audio characteristic curve by utilizing a hardware audio characteristic curve of the audio receiver to obtain a finally modified audio characteristic curve of the sound source device.
By adopting the technical scheme, the external noise signals and the audio signals of one or more sound source devices are simultaneously acquired by utilizing the plurality of audio receivers, and the de-noising audio characteristic curve is corrected by utilizing the hardware audio characteristic curve of the audio receivers, so that the measured audio characteristic curve result of the sound source devices eliminates the distortion caused by the hardware audio characteristic curve of the audio receivers, the accuracy is improved, and the finally obtained audio characteristic curve of the sound source devices after being corrected is closer to a flat ideal audio characteristic curve.
Preferably, the method specifically comprises the following steps:
under the condition of controlling all sound source devices to be in a mute state, acquiring external noise signals simultaneously acquired by one or more audio receivers; wherein the plurality of audio receivers are placed at different locations;
carrying out frequency conversion on the external noise signal to obtain an external noise frequency curve corresponding to the audio receiver;
for each sound source device, the following steps are performed:
controlling a certain sound source device to send a sweep frequency signal and controlling other sound source devices to be in a mute state at the same time, and acquiring audio signals of the sound source devices which are simultaneously acquired by a plurality of audio receivers;
carrying out frequency conversion on the audio signals of the sound source device to obtain audio characteristic curves of the audio receivers corresponding to the sound source device;
taking the external noise frequency curve corresponding to each audio receiver and the audio characteristic curve of a certain sound source device corresponding to the external noise frequency curve as a group of data to perform denoising processing, and obtaining the denoising audio characteristic curve of a certain sound source device corresponding to each audio receiver;
and correcting the de-noising audio characteristic curve of a certain sound source device corresponding to each audio receiver by using the hardware audio characteristic curve of the audio receiver to obtain the finally corrected audio characteristic curve of the sound source device.
By adopting the technical scheme, the audio receivers with fixed positions are used for uniformly collecting the external noise signals once, and one audio receiver is not used for collecting a plurality of external noise signals for a plurality of times in a moving way, so that new interference signals caused by position change and manual operation can be avoided, and the accuracy of audio characteristic measurement of the sound source device is improved; in addition, the acquisition method can be automatically completed by the system without manually moving the audio receiver or operating a button after the measurement is started; the testing method has expandability, and is suitable for systems consisting of any number of sound source devices and audio receivers.
Preferably, the modifying the de-noised audio characteristic curve by using the hardware audio characteristic curve of the audio receiver to obtain the final modified audio characteristic curve of the sound source device specifically includes:
acquiring a hardware audio characteristic curve and an ideal audio characteristic curve of each audio receiver;
calculating the ratio of the amplitude of the ideal audio characteristic curve to the amplitude of the hardware audio characteristic curve to obtain the gain required by correcting each frequency component;
modifying the de-noised audio characteristic curve corresponding to each sound source device by using the gain required by modifying each frequency component to obtain a modified audio characteristic curve of the sound source device corresponding to each audio receiver;
and obtaining the finally corrected audio characteristic curves of the sound source devices according to the corrected audio characteristic curves aiming at the same sound source device in all the audio receivers.
By adopting the technical scheme, the denoising audio characteristic curve corresponding to each sound source device is modified by utilizing the gain required by modifying each frequency component, so that the finally obtained audio characteristic curve of the sound source device is more accurate and is only related to the characteristics of the sound source device, and the sound source device can be suitable for any audio receiver after being adjusted, so that a listener can obtain better hearing.
Preferably, the finally corrected audio characteristic curves of the sound source devices are obtained according to the corrected audio characteristic curves of the same sound source device in all the audio receivers, and specifically, the corrected audio characteristic curves of the same sound source device in all the audio receivers are used as a group, and mean value processing is performed to obtain the finally corrected audio characteristic curves of the sound source devices. Random errors caused by different positions of the audio receiver are reduced through mean processing, and therefore the finally obtained audio characteristic curve of the sound source device can be more accurate.
Preferably, the hardware audio characteristic curve of the audio receiver is obtained by the following method:
arranging an ideal sound source in a anechoic chamber, and connecting an audio receiver to be tested with a spectrum analyzer when the sound source emits a frequency sweep signal with constant sound pressure in a frequency range of 20Hz to 20kHz, so as to obtain a hardware audio characteristic curve of the audio receiver; the ideal sound source is a sound source of which the fluctuation of the amplitude of the corresponding audio characteristic curve after the sound source is amplified is not more than 0.5 dB.
By adopting the technology, the ideal sound source is arranged in the anechoic chamber, and when the sound source emits the frequency sweeping signal with the frequency range of 20Hz to 20kHz and the sound pressure is constant, the audio characteristic curve of the audio receiver, namely the hardware audio characteristic curve of the audio receiver is obtained through testing, so that the accurate hardware audio characteristic curve of the audio receiver can be obtained on the basis of meeting the auditory range of human ears in practical application.
Or preferably, the hardware audio characteristic curve of the audio receiver is obtained by the following method:
selecting an ideal audio receiver with known hardware audio characteristics as a reference, namely a standard audio receiver; the ideal audio receiver is an audio receiver of which the fluctuation of the amplitude of the corresponding hardware audio characteristic curve is not more than 1 dB;
placing and fixing a standard audio receiver and an ideal sound source in the same sound field; the sound source sends out a frequency sweeping signal with constant sound pressure in a frequency range of 20Hz to 20kHz to obtain an audio characteristic curve of the standard audio receiver;
acquiring a hardware audio characteristic curve of a standard audio receiver as a known reference, and dividing the measured audio characteristic curve of the standard audio receiver by the amplitude of the hardware audio characteristic curve to obtain a corrected audio characteristic curve;
replacing a standard audio receiver with an audio receiver to be tested, keeping the positions and the orientations of the audio receiver and a sound source unchanged, adjusting the test parameters to be the same, and sending the same frequency sweeping signals by the sound source to obtain an audio characteristic curve of the audio receiver to be tested;
dividing the audio receiver to be tested by the corrected audio characteristic curve amplitude to obtain a deviation curve of the audio receiver to be tested; and using the deviation curve as a final hardware audio characteristic curve of the audio receiver to be tested.
By adopting the technical scheme, the standard audio receiver is utilized, the audio receiver to be measured can be measured in a common room, the trouble of constructing a complex anechoic chamber is avoided, and the hardware audio characteristic curve of the audio receiver can be quickly and accurately measured.
Preferably, the ideal audio characteristic curve, i.e. the curve of the frequency sweep signal emitted by the system, corresponds to each frequency component being 0dB, so as to ensure the reference meaning.
In a second aspect, the present application provides a sound field modification system for a sound source apparatus, which adopts the following technical solutions:
a sound field modification system of an audio source apparatus, comprising:
the external noise signal and audio signal acquisition module is used for acquiring external noise signals simultaneously acquired by one or more audio receivers and audio signals of one or more sound source devices;
the frequency conversion module is used for carrying out frequency conversion on the external noise signal and the audio signal of the sound source device to obtain an external noise frequency curve corresponding to the audio receiver and audio characteristic curves corresponding to the sound source devices;
the denoising processing module is used for denoising the audio characteristic curves corresponding to the sound source devices by using the external noise frequency curve to obtain denoising audio characteristic curves;
and the de-noising audio characteristic curve modification module is used for modifying the de-noising audio characteristic curve by utilizing a hardware audio characteristic curve of the audio receiver to obtain a finally modified audio characteristic curve of the sound source device.
In a third aspect, the present application provides an electronic device, which adopts the following technical solutions:
an electronic device comprising a memory and a processor, the memory having stored thereon a computer program that can be loaded by the processor and executed to perform any of the methods as described above.
In a fourth aspect, the present application further provides a sound field modification system for a sound source apparatus, which adopts the following technical solution:
a sound field correction system of a sound source device comprises a DSP digital signal processor and a computer device; the DSP is used for acquiring external noise signals simultaneously acquired by one or more audio receivers and audio signals of one or more sound source devices, and performing frequency conversion on the external noise signals and the audio signals of the sound source devices to acquire external noise frequency curves corresponding to the audio receivers and audio characteristic curves corresponding to the sound source devices; the computer equipment is used for carrying out denoising treatment on the audio characteristic curves corresponding to the sound source devices by using the external noise frequency curve to obtain denoised audio characteristic curves, and then modifying the denoised audio characteristic curves by using the hardware audio characteristic curves of the audio receiver to obtain finally modified audio characteristic curves of the sound source devices; and the computer equipment sends the correction parameters to the DSP, and the DSP calculates filter parameters by using the correction parameters and performs filtering to realize the purpose of sound field correction on the sound source device.
In a fifth aspect, the present application provides a computer-readable storage medium, which adopts the following technical solutions:
a computer-readable storage medium storing a computer program that can be loaded by a processor and executed to perform a method according to any one of the preceding claims.
To sum up, the application comprises the following beneficial technical effects:
this application utilizes a plurality of audio frequency receivers to gather external noise signal and the audio signal of one or more sound source device simultaneously, and utilize audio frequency receiver's hardware audio characteristic curve pair the audio characteristic curve of removing noise is revised, thereby make the audio characteristic curve result after the sound source device is revised more accurate, more be close to the truth, use DSP digital signal processor to carry out the audio characteristic curve after the filtering to the sound source device and more be close to flat ideal audio characteristic curve, and this curve is all irrelevant with arbitrary audio frequency receiver, adjust the sound source device after adopting the method of this application to measure the audio characteristic of sound source device promptly, the sound source device after the adjustment can be applicable to any audio frequency receiver, thereby can make the audience can obtain better listening sense.
Drawings
FIG. 1 is a schematic flow chart of a method according to an embodiment of the present application.
Fig. 2 is a schematic diagram of an arrangement of an audio source device and an audio receiver according to an embodiment of the present application.
Reference numerals: 1-16-sound source device; 17-21-an audio receiver; 22-a computer device; 23-DSP digital signal processor.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The inventor finds out in the research process that: the prior art mentioned in the background art only uses an audio receiver (i.e. a device for receiving sound) to adjust an audio source device (i.e. a device for emitting sound), but does not consider that the audio receiver itself will also distort signals, so that the adjusted audio source device is still distorted, and if another audio receiver is used to adjust the audio source device, the adjusted result will be different, so that the sound emitted by the audio source device will still affect the human hearing after the audio characteristics of the audio source device are measured by the prior art method for adjusting the audio source device.
In order to improve the accuracy of measuring the audio characteristics of the sound source device, the embodiment of the application discloses a method for obtaining the audio characteristics of the sound source device. Referring to fig. 1, a method for obtaining audio characteristics of an audio source device includes the following steps:
s1, acquiring external noise signals simultaneously acquired by one or more audio receivers and audio signals of one or more audio source devices; the external noise signal is a noise signal of an environment where the audio receiver is located;
s2, carrying out frequency conversion on the external noise signal and the audio signal of the sound source device to obtain an external noise frequency curve corresponding to the audio receiver and an audio characteristic curve corresponding to each sound source device;
s3, carrying out denoising treatment on the audio characteristic curves corresponding to the sound source devices by using the external noise frequency curve to obtain denoising audio characteristic curves;
and S4, correcting the de-noised audio characteristic curve by using the hardware audio characteristic curve of the audio receiver to obtain the finally corrected audio characteristic curve of the sound source device.
The audio characteristic of the sound source device is that when an audio signal output by constant voltage is connected with the sound source device, the generated sound pressure is increased or attenuated along with the change of frequency, and the phase is changed along with the change of frequency.
In step S3, the denoising process is performed, that is, the hardware audio characteristic curve and the external noise frequency curve are processed by using spectral subtraction.
In the above method, the position and orientation of the sound source device are set according to actual conditions. For an enclosed space, the source devices are typically distributed around the edges of the space, facing the inside of the space, and remain unchanged in position and orientation during the measurement process and during subsequent use. The position of the audio receiver is usually placed inside the space, and has no orientation requirement, and can be removed after the measurement is finished (because the main purpose of the audio receiver is to modify the audio characteristic curve of the audio source device, and the audio characteristic curve of the audio source device is modified and is not related to the audio receiver when in specific application).
In this embodiment, the audio system may be composed of any number of sound source devices and any number of audio receivers, and the sound field received by each audio receiver at its respective position is measured. The number and location of the audio source devices and audio receivers are generally determined according to the size of the room, sound-creating conditions and practical application, for example, in case of a small room, only 1 audio receiver may be provided, in case of a large room, an audio receiver array may be provided, for example, in the audio system shown in fig. 2, 16 audio source devices (numbered 1-16) and 5 audio receivers (numbered 17-20) are provided, which is suitable for a large conference room, etc. Rooms with different functions have different acoustic requirements, each room has acoustic characteristics, building materials, space size and shape, and internal decoration and placing facilities all form influence factors on sound, and in order to obtain a good acoustic effect, coordination processing must be carried out on indoor equipment placement. For the sound source device which is already arranged, the acoustic requirements are usually met, the placement of the audio receiver generally has no special requirements, and only the sound source device is required to be oriented inside; for the arrangement of the movable sound source device and the audio receiver, reference may be made to the opinion of the disc-jockey.
For example, a movable audio receiver (such as a microphone) is provided on a platform in a classroom, since the range of motion of a speaker is usually only on the platform, a plurality of audio receivers (such as a unidirectional microphone or a cardioid microphone) need to be arranged on the platform according to the size of the platform, and the overall gain (sensitivity) of the audio receivers needs to be adjusted appropriately to ensure that the speaker can clearly receive and record the voice. For other locations in the classroom, a certain number of audio receivers may also be arranged at equal distances, for example, one microphone (which may be an omnidirectional microphone) is arranged every two desks, and the gain of the microphone is adjusted so that the amplitude of the received signal is similar. For the above scenario, since the microphone arrangement is complicated, there is a certain requirement for the professional level when the audio characteristics of the sound source device (such as a speaker) are measured by artificially moving the microphone in the prior art. When the method is used for measuring the audio characteristics of the sound source device, automatic measurement (without moving the position of the microphone) can be carried out after one-time arrangement, so that the workload of professionals is greatly reduced.
In addition, all the audio receivers have corresponding hardware audio characteristic curves, and the received signals are corrected on software by using the hardware audio characteristics of the audio receivers, so that the signals received by the audio receivers are close to real signals. Therefore, the real signal emitted by the sound source device is obtained by utilizing the audio characteristic curve of the audio receiver, so that the audio characteristic of the sound source device is adjusted to an ideal state. In the following practical application, the audio receiver is not used for receiving the signal of the sound source device, but for receiving the sound of musical instruments, human voice, etc., the sound sources are not related to whether the sound source device is close to ideal. Therefore, the technology of the application is applied to measure the frequency response characteristics of the sound source device, and after the sound source device is adjusted, the number of the audio receivers is increased in the application process subsequently without re-adjusting the sound source device.
The room reflection circuit is a circuit in which sound waves emitted from the sound source device are refracted back and forth in a room, and is an important source of noise. For the listener, the reverberation, echo, and even howling of the sound is related to the reflection loop. It is related to the reflectivity of the room wall, the size of the room, the distribution mode of the sound source device and the audio receiver, the direction of the sound, the propagation speed of the sound in the room, and the like; in addition, the placement and size of the devices, the movement of people in the room, the opening and closing of doors, temperature changes, etc. can also have an effect. Therefore, it can be seen that the placement of the sound source device affects the frequency characteristics of the external noise, and therefore, in the prior art in the background art, when the mobile audio receiver performs measurement, noise changes may be caused, at this time, new errors may be introduced by averaging noise curves measured many times, and when the audio receiver is set, the audio receiver needs to be manually moved to perform point-by-point measurement, and after the audio receiver is moved, the sound source device is manually controlled to send a frequency sweep signal, so that the operation difficulty of a user is increased. Therefore, in the application, one or more audio receivers are adopted for measurement, the positions of the audio receivers are fixed, and the audio receivers do not move after the measurement is started, so that the noise error of the part can be effectively reduced, and the accuracy of the measurement of the audio characteristics of the sound source device is improved. Therefore, the system only needs to control each sound source device to send out the sweep frequency signal in turn when starting to measure, and a plurality of audio receivers measure simultaneously, and the process can be automatically completed by the system.
The hardware audio characteristic curve of the audio receiver can be obtained by the following method:
arranging an ideal sound source in a anechoic chamber, and connecting an audio receiver to be tested with a spectrum analyzer when the sound source emits a frequency sweep signal with constant sound pressure in a frequency range of 20Hz to 20kHz, so as to obtain a hardware audio characteristic curve of the audio receiver; the ideal sound source is a sound source of which the fluctuation of the amplitude of the corresponding audio characteristic curve after the sound source is amplified is not more than 0.5 dB.
The audio characteristic curve measured by the method can be recorded in a hardware memory and directly called. Specifically, the hardware used in the actual engineering may be a DSP digital signal processor, which has a certain storage function. The audio receiver audio characteristic curve obtained by measurement in the anechoic chamber is absolutely accurate, and if the audio receiver audio characteristic curve is measured all the time and processed by a fixed DSP processor, the audio receiver audio characteristic curve can be stored in hardware of the processor to be directly read. For example, in a room, 8 microphones are fixed, a DSP processor is fixed, and the processor sets 8 channels corresponding to the 8 microphones, so that hardware audio characteristics of the 8 microphones can be recorded in a memory of the processor and can be directly called.
The audio characteristic curve, namely the variation curve of amplitude (gain) along with frequency, is ideal and straight, and sound signals are not distorted after passing through the curve, namely a standard signal generator is used for emitting sine wave signals with the same amplitude and different frequencies, the sine wave signals are amplified by a sound source device, the obtained output signals are amplified in an equal ratio mode of the signals emitted by a sound generator, and at the moment, the frequency is used as an abscissa and the amplitude is used as an ordinate, the audio characteristic curve is drawn, and the straight curve is obtained. Moreover, the test results are stably reproducible within a certain amplification power range. And if the fluctuation of the amplitude of the audio characteristic curve amplified by the sound source is not more than 0.5dB, the sound source is the ideal sound source.
Generally, the measurement environment of the hardware audio characteristics of the audio receiver should be a free sound field, and the audio receiver to be measured is usually required to be placed in an anechoic chamber and measured by using a point sound source. However, if the standard audio receiver exists, the standard audio receiver can be placed in the space to be tested, and other audio receivers can be calibrated. The space to be measured is generally a reverberation sound field, a sound source is used for emitting a frequency sweep signal with constant sound pressure in the frequency range of 20Hz to 20kHz, the ratio of an audio characteristic curve of a standard audio receiver in the space to be measured to a hardware audio characteristic curve of the standard audio receiver is used as a reference value, the audio receiver to be measured is placed in the same space in the same state, environmental factors are removed, the same frequency sweep signal emitted by the same sound source is measured, and the ratio of the obtained audio characteristic curve to the reference value is a relatively accurate relative value.
Specifically, the hardware audio characteristic curve of the audio receiver can be obtained by the following method:
s411, selecting an ideal audio receiver with known hardware audio characteristics as a reference, namely a standard audio receiver; the ideal audio receiver is an audio receiver of which the fluctuation of the amplitude of the corresponding hardware audio characteristic curve is not more than 1 dB;
s412, placing the standard audio receiver and the ideal sound source in the same sound field and fixing; the sound source sends out a frequency sweeping signal with constant sound pressure in a frequency range of 20Hz to 20kHz to obtain an audio characteristic curve of the standard audio receiver;
s413, acquiring hardware audio characteristics of the standard audio receiver as a known reference, and dividing the measured audio characteristic curve of the standard audio receiver by the amplitude of the hardware audio characteristic curve to obtain a corrected audio characteristic curve;
s414, replacing the standard audio receiver with the audio receiver to be tested, keeping the positions and the orientations of the audio receiver and the sound source unchanged, adjusting the test parameters to be the same, and sending out the same frequency sweeping signals by the sound source to obtain an audio characteristic curve of the audio receiver to be tested; wherein, the "position and orientation" refers to relative position and orientation for the measurement in the free field of the anechoic chamber, and refers to absolute position and orientation for the measurement in the reverberant field of the common room; the test parameters comprise used power supply voltage, power supply frequency, load of a sound source, amplification gains of the sound source and an audio receiver, frequency, amplitude, conversion speed and the like of a sweep frequency signal emitted by the sound source; but also the temperature, humidity, atmospheric pressure, etc. of the environment; specifically, for example, a standard audio receiver and an audio receiver to be tested are placed at the same measurement position in a sound field, and the standard atmospheric pressure conditions of the test are as follows: ambient temperature 15 to 35 ℃, relative humidity 25% to 75%, air pressure 86kPa to 106 kPa. It should be ensured that the environmental parameters are within this range and that the temperature fluctuations do not exceed 1 degree and the humidity fluctuations do not exceed 5% throughout the test.
S415, dividing the audio receiver to be tested by the corrected audio characteristic curve amplitude to obtain a deviation curve of the audio receiver to be tested; and using the deviation curve as a final hardware audio characteristic curve of the audio receiver to be tested. The amplitude spectrum of each curve can be converted into a decibel spectrum, and the amplitude ratio value is converted into a decibel difference value.
In the method, the corrected audio characteristic curve is the curve of the standard audio receiver, and is irrelevant to the hardware characteristic of the standard audio receiver and only relevant to the influence of the environmental noise on the frequency sweeping signal. That is, the modified audio characteristic reflects the superposition of the frequency sweep signal and the ambient noise. Therefore, the same frequency sweeping signal is sent out, and the amplitude of the audio receiver to be tested is divided by the amplitude of the corrected audio characteristic curve, so that the hardware frequency response curve of the audio receiver under the condition of removing the environmental influence is obtained.
The audio receiver audio characteristics measured in a typical room, i.e., a reverberant sound field, are relatively accurate and may change with changes in the environmental conditions, may not change much in a short period of time, may be temporarily stored in a processor for recall, and may need to be re-calibrated after a period of time. However, the method avoids the trouble of constructing a complex anechoic chamber, can measure in any sound field, namely can directly measure in a room where the audio receiver to be measured is located, and is simple and efficient, and the measuring conditions are not harsh. Likewise, during the measurement, the sound source emits a frequency sweep signal with constant sound pressure in the frequency range of 20Hz to 20 kHz.
In this embodiment, in step S4, the modifying the denoising audio characteristic curve by using the hardware audio characteristic curve of the audio receiver to obtain the final modified audio characteristic curve of the sound source device specifically includes:
s41, acquiring a hardware audio characteristic curve and an ideal audio characteristic curve of each audio receiver;
the frequency of an output signal of the signal generator is continuously changed (swept) and the amplitude is kept unchanged, the signal is an ideal swept signal, the frequency Hz is used as an abscissa, the sound pressure dB is used as an ordinate, and a drawn curve is an ideal audio characteristic curve. Because the amplitudes of all points are equal, the reference amplitude value is the same as the amplitude value corresponding to each frequency when the dB value is calculated, and all points are 0 dB;
s42, calculating the ratio of the amplitude of the ideal audio characteristic curve to the amplitude of the hardware audio characteristic curve of the audio receiver, and obtaining the gain required by correcting each frequency component;
s43, modifying the de-noised audio characteristic curve corresponding to each sound source device by using the gain needed for modifying each frequency component to obtain the modified audio characteristic curve of the sound source device corresponding to each audio receiver;
s44, obtaining the final modified audio characteristic curves of the sound source devices according to the modified audio characteristic curves of the same sound source device in all the audio receivers.
Assume that the hardware audio characteristic of the audio receiver i is
For the de-noised audio characteristic curve of the sound source device j corresponding to the audio receiver
The quotient is processed to obtain a correction curve
。
But in practice, decibel spectra are often used from this step up to adjusting the equalizer. The correction process thus becomes:
firstly, converting the hardware audio characteristic curve and the de-noising audio characteristic curve into decibel spectrums by respectively using the same amplitude value as a reference amplitude, and subtracting the decibel value corresponding to the hardware audio characteristic curve from the decibel value corresponding to each frequency in the de-noising audio characteristic curve to obtain the decibel spectrums of the modified audio characteristic curve, namely: let the decibel spectrum of the hardware audio characteristic curve be
The decibel spectrum of the de-noised audio characteristic curve is
The resulting decibel spectrum of the modified audio characteristic curve is
：
。
In step S44, the final corrected audio characteristic curves of the sound source devices are obtained according to the corrected audio characteristic curves for the same sound source device in all the audio receivers, and specifically, the corrected audio characteristic curves for the same sound source device in all the audio receivers are taken as a group, and an average value processing is performed to obtain the final corrected audio characteristic curves of the sound source devices.
The method for acquiring the audio characteristic curve of the sound source device specifically comprises the following steps:
under the condition of controlling all sound source devices to be in a mute state, acquiring external noise signals simultaneously acquired by one or more audio receivers; wherein the plurality of audio receivers are placed at different locations;
carrying out frequency conversion on the external noise signal to obtain an external noise frequency curve corresponding to the audio receiver;
for each sound source device, the following steps are performed:
controlling a certain sound source device to send a sweep frequency signal and controlling other sound source devices to be in a mute state at the same time, and acquiring audio signals of the sound source devices which are simultaneously acquired by a plurality of audio receivers;
carrying out frequency conversion on the audio signals of the sound source device to obtain audio characteristic curves of the audio receivers corresponding to the sound source device;
taking the external noise frequency curve corresponding to each audio receiver and the audio characteristic curve of a certain sound source device corresponding to the external noise frequency curve as a group of data to perform denoising processing, and obtaining the denoising audio characteristic curve of a certain sound source device corresponding to each audio receiver;
and correcting the de-noising audio characteristic curve of a certain sound source device corresponding to each audio receiver by using the hardware audio characteristic curve of the audio receiver to obtain the finally corrected audio characteristic curve of the sound source device.
In other embodiments, in the noise measurement process, multiple sets of data may also be measured, and frequency conversion and mean value processing are performed to obtain an external noise frequency curve. For example, at a sampling rate of 48kHz, every 1024 samples serves as a set of data, which is approximately 21ms in elapsed time (the spectrum of data over a short period of time, i.e., 25ms, is generally considered to be stationary). Taking multiple groups of data, such as 5 groups of data, respectively converting the data into frequency curves, and then carrying out mean value processing on multiple amplitude values corresponding to each frequency in the multiple groups of frequency curves to obtain an average external noise frequency curve.
The embodiment also discloses a sound field correction system of the sound source device. A sound field modification system of an audio source apparatus, comprising:
the external noise signal and audio signal acquisition module is used for acquiring external noise signals simultaneously acquired by one or more audio receivers and audio signals of one or more sound source devices;
the frequency conversion module is used for carrying out frequency conversion on the external noise signal and the audio signal of the sound source device to obtain an external noise frequency curve corresponding to the audio receiver and audio characteristic curves corresponding to the sound source devices;
the denoising processing module is used for denoising the audio characteristic curves corresponding to the sound source devices by using the external noise frequency curve to obtain denoising audio characteristic curves;
and the de-noising audio characteristic curve modification module is used for modifying the de-noising audio characteristic curve by utilizing a hardware audio characteristic curve of the audio receiver to obtain a finally modified audio characteristic curve of the sound source device.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules, so as to perform all or part of the functions described above.
The embodiment also discloses the electronic equipment. An electronic device comprising a memory and a processor, said memory having stored thereon a computer program that can be loaded by the processor and that executes any of the methods described above.
The electronic device may be an electronic device such as a desktop computer, a notebook computer, or a cloud server, and the electronic device includes but is not limited to a processor and a memory, for example, the electronic device may further include an input/output device, a network access device, a bus, and the like.
A processor in the present application may include one or more processing cores. The processor executes or executes the instructions, programs, code sets, or instruction sets stored in the memory, calls data stored in the memory, performs various functions of the present application, and processes the data. The Processor may be at least one of an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a Central Processing Unit (CPU), a controller, a microcontroller, and a microprocessor. It is understood that the electronic devices for implementing the above processor functions may be other devices, and the embodiments of the present application are not limited in particular.
The memory may be an internal storage unit of the electronic device, for example, a hard disk or a memory of the electronic device, or an external storage device of the electronic device, for example, a plug-in hard disk, a smart card (SMC), a secure digital card (SD) or a flash memory card (FC) provided on the electronic device, and the memory may also be a combination of the internal storage unit of the electronic device and the external storage device, and the memory is used for storing a computer program and other programs and data required by the electronic device, and may also be used for temporarily storing data that has been output or will be output, which is not limited in this application.
The embodiment also discloses a sound field correction system of the sound source device. As shown in fig. 2, a sound field modification system of a sound source apparatus includes a computer device 22 and a DSP digital signal processor 23; the DSP 23 is configured to obtain an external noise signal and audio signals of one or more sound source devices, which are simultaneously acquired by one or more audio receivers, and perform frequency conversion on the external noise signal and the audio signals of the sound source devices to obtain an external noise frequency curve corresponding to the audio receiver and an audio characteristic curve corresponding to each sound source device; the computer device 22 is configured to perform denoising processing on the audio characteristic curves corresponding to the sound source devices by using the external noise frequency curve to obtain denoised audio characteristic curves, and then modify the denoised audio characteristic curves by using the hardware audio characteristic curves of the audio receiver to obtain audio characteristic curves after final modification of the sound source devices; the computer device 22 sends the correction parameters to the DSP digital signal processor 23, and the DSP digital signal processor 23 calculates filter parameters by using the correction parameters and performs filtering, thereby achieving the purpose of performing sound field correction on the sound source device.
When the audio receiver is fixedly connected to the system, i.e. the audio receiver is not replaced or added or removed, the hardware audio characteristic for the audio receiver needed for the correction can be stored in the computer device 22.
The computer device 22 may also provide a visual software for observing and adjusting the audio characteristic curve of the sound source device, for example, when the sound source device has been tuned, and the disc-jockey changes the gains of some frequency bands according to the needs of the field, the computer device 22 may send the adjusted data to the DSP digital signal processor 23 in real time, and the DSP digital signal processor 23 updates the filter parameters to perform real-time filtering, and performs sound field correction on the sound source device.
The embodiment also discloses a computer readable storage medium. A computer readable storage medium storing a computer program capable of being loaded by a processor and performing any of the methods described above.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, the computer program can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent variations made according to the methods and principles of the present application should be covered by the protection scope of the present application.
Claims (10)
1. A method for obtaining audio characteristics of a sound source device, comprising: the method comprises the following steps:
acquiring external noise signals simultaneously acquired by one or more audio receivers and audio signals of one or more sound source devices;
carrying out frequency conversion on the external noise signal and the audio signal of the sound source device to obtain an external noise frequency curve corresponding to the audio receiver and audio characteristic curves corresponding to the sound source devices;
denoising the audio characteristic curves corresponding to the sound source devices by using the external noise frequency curve to obtain denoised audio characteristic curves;
and modifying the de-noising audio characteristic curve by utilizing a hardware audio characteristic curve of the audio receiver to obtain a finally modified audio characteristic curve of the sound source device.
2. The method of claim 1, wherein the audio characteristics of the sound source device are obtained by: the method specifically comprises the following steps:
under the condition of controlling all sound source devices to be in a mute state, acquiring external noise signals simultaneously acquired by one or more audio receivers; wherein the plurality of audio receivers are placed at different locations;
carrying out frequency conversion on the external noise signal to obtain an external noise frequency curve corresponding to the audio receiver;
for each sound source device, the following steps are performed:
controlling a certain sound source device to send a sweep frequency signal and controlling other sound source devices to be in a mute state at the same time, and acquiring audio signals of the sound source devices which are simultaneously acquired by a plurality of audio receivers;
carrying out frequency conversion on the audio signals of the sound source device to obtain audio characteristic curves of the audio receivers corresponding to the sound source device;
taking the external noise frequency curve corresponding to each audio receiver and the audio characteristic curve of a certain sound source device corresponding to the external noise frequency curve as a group of data to perform denoising processing, and obtaining the denoising audio characteristic curve of a certain sound source device corresponding to each audio receiver;
and correcting the de-noising audio characteristic curve of a certain sound source device corresponding to each audio receiver by using the hardware audio characteristic curve of the audio receiver to obtain the finally corrected audio characteristic curve of the sound source device.
3. The audio characteristic acquisition method for the sound source device according to claim 1 or 2, wherein: the modifying the de-noising audio characteristic curve by using the hardware audio characteristic curve of the audio receiver to obtain the finally modified audio characteristic curve of the sound source device specifically comprises the following steps:
acquiring a hardware audio characteristic curve and an ideal audio characteristic curve of each audio receiver;
calculating the ratio of the amplitude of the ideal audio characteristic curve to the amplitude of the hardware audio characteristic curve to obtain the gain required by correcting each frequency component;
modifying the de-noised audio characteristic curve corresponding to each sound source device by using the gain required by modifying each frequency component to obtain a modified audio characteristic curve of the sound source device corresponding to each audio receiver;
and obtaining the finally corrected audio characteristic curves of the sound source devices according to the corrected audio characteristic curves aiming at the same sound source device in all the audio receivers.
4. The method of claim 3, wherein the audio characteristics of the sound source device are obtained by: specifically, the modified audio characteristic curves for the same sound source device in all the audio receivers are used as a group, and mean value processing is performed to obtain the finally modified audio characteristic curves for each sound source device.
5. The method of claim 1, wherein the hardware audio characteristic curve of the audio receiver is obtained by:
arranging an ideal sound source in a anechoic chamber, and connecting an audio receiver to be tested with a spectrum analyzer when the sound source emits a frequency sweep signal with constant sound pressure in a frequency range of 20Hz to 20kHz, so as to obtain a hardware audio characteristic curve of the audio receiver; the ideal sound source is a sound source of which the fluctuation of the amplitude of the corresponding audio characteristic curve after the sound source is amplified is not more than 0.5 dB.
6. The method of claim 1, wherein the hardware audio characteristic curve of the audio receiver is obtained by:
selecting an ideal audio receiver with known hardware audio characteristics as a reference, namely a standard audio receiver; the ideal audio receiver is an audio receiver of which the fluctuation of the amplitude of the corresponding hardware audio characteristic curve is not more than 1 dB;
placing and fixing a standard audio receiver and an ideal sound source in the same sound field; the sound source sends out a frequency sweeping signal with constant sound pressure in a frequency range of 20Hz to 20kHz to obtain an audio characteristic curve of the standard audio receiver;
acquiring a hardware audio characteristic curve of a standard audio receiver as a known reference, and dividing the measured audio characteristic curve of the standard audio receiver by the amplitude of the hardware audio characteristic curve to obtain a corrected audio characteristic curve;
replacing a standard audio receiver with an audio receiver to be tested, keeping the positions and the orientations of the audio receiver and a sound source unchanged, adjusting the test parameters to be the same, and sending the same frequency sweeping signals by the sound source to obtain an audio characteristic curve of the audio receiver to be tested;
dividing the audio receiver to be tested by the corrected audio characteristic curve amplitude to obtain a deviation curve of the audio receiver to be tested; and using the deviation curve as a final hardware audio characteristic curve of the audio receiver to be tested.
7. A sound field modification system for an audio source apparatus, comprising:
the external noise signal and audio signal acquisition module is used for acquiring external noise signals simultaneously acquired by one or more audio receivers and audio signals of one or more sound source devices;
the frequency conversion module is used for carrying out frequency conversion on the external noise signal and the audio signal of the sound source device to obtain an external noise frequency curve corresponding to the audio receiver and audio characteristic curves corresponding to the sound source devices;
the denoising processing module is used for denoising the audio characteristic curves corresponding to the sound source devices by using the external noise frequency curve to obtain denoising audio characteristic curves;
and the de-noising audio characteristic curve modification module is used for modifying the de-noising audio characteristic curve by utilizing a hardware audio characteristic curve of the audio receiver to obtain a finally modified audio characteristic curve of the sound source device.
8. An electronic device comprising a memory and a processor, the memory having stored thereon a computer program that can be loaded by the processor and that executes the method according to any of claims 1 to 6.
9. A sound field correction system of a sound source device is characterized by comprising a DSP digital signal processor and a computer device; the DSP is used for acquiring external noise signals simultaneously acquired by one or more audio receivers and audio signals of one or more sound source devices, and performing frequency conversion on the external noise signals and the audio signals of the sound source devices to acquire external noise frequency curves corresponding to the audio receivers and audio characteristic curves corresponding to the sound source devices; the computer equipment is used for carrying out denoising treatment on the audio characteristic curves corresponding to the sound source devices by using the external noise frequency curve to obtain denoised audio characteristic curves, and then modifying the denoised audio characteristic curves by using the hardware audio characteristic curves of the audio receiver to obtain finally modified audio characteristic curves of the sound source devices; and the computer equipment sends the correction parameters to the DSP, and the DSP calculates filter parameters by using the correction parameters and performs filtering to realize the purpose of sound field correction on the sound source device.
10. A computer-readable storage medium, in which a computer program is stored which can be loaded by a processor and which executes the method of any one of claims 1 to 6.
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