Audio frequency division equalizer independent control method and audio control system

Abstract

The invention discloses an audio frequency division equalizer independent control method and an audio frequency control system. The method comprises the following steps: carrying out global EQ processing on an audio signal; performing frequency division on the audio signal to obtain a plurality of interval signals based on the frequency division base point; performing independent DRC processing and independent EQ processing on each interval signal; and performing superposition processing on each processed interval signal to obtain a target signal. Therefore, after global EQ processing is performed on the audio signal, frequency division is further performed on the audio signal to obtain a plurality of interval signals, independent DRC processing and independent EQ processing are performed in a distributed manner, and then superposition is performed to obtain a target signal. Therefore, the setting of the frequency division points and the independent processing of each interval signal can ensure that the adjustment processing process does not affect the unplanned frequency band, and finally the tone matched with the target parameter is obtained, and the flexibility and accuracy of audio adjustment are significantly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of audio processing, and in particular to an independent control method for an equalizer of audio frequency division and an audio control system. Background Art

[0002] In audio DSP processors, DRC (Dynamic Range Control) and EQ (Equalizer) are two key control modules. DRC is mainly used to adjust the dynamic range of audio signals to make the audio sound softer or louder, while EQ adjusts the tone by controlling the gain / attenuation of one or more audio channels.

[0003] Typically, during audio processing, DRC and EQ, as two independent control modules, process the same audio segment. For example, EQ is applied to the audio first, followed by DRC. While this approach can optimize the overall audio parameters to meet playback requirements, due to objective phenomena such as filter attenuation, precise control of the signal amplitude near the crossover point is difficult. This means that when EQ is applied to the target frequency band, signals in frequency bands near the target band are also affected, deviating from the original target parameters. This results in a poor final adjustment of the timbre and limits the flexibility and accuracy of the audio adjustment process. Summary of the Invention

[0004] A first aspect of an embodiment of the present invention discloses a method for independently controlling an equalizer for audio frequency division, specifically comprising:

[0005] Perform global EQ processing on audio signals;

[0006] Based on the frequency division base point, the audio signal is divided into several interval signals;

[0007] Perform independent DRC processing and independent EQ processing on each interval signal;

[0008] The target signal is obtained by superimposing the processed signals of each interval.

[0009] As an optional implementation manner, the frequency division of the audio signal into a plurality of interval signals based on the frequency division base point includes:

[0010] Setting a static filter to divide the input audio signal into a plurality of interval signals according to a frequency division base point;

[0011] The interval signal at least includes a low-pass interval, a band-pass interval and a high-pass interval.

[0012] As an optional implementation manner, performing independent DRC processing and independent EQ processing on each interval signal includes:

[0013] Configure independent DRC algorithm and independent EQ algorithm for each interval signal;

[0014] The independent DRC algorithm adjusts the dynamic control range of the corresponding interval signal based on the calibrated dynamic range;

[0015] The independent EQ algorithm adjusts the equalization parameters of the corresponding interval signal based on the calibrated equalization range.

[0016] As an optional implementation, the method further includes:

[0017] The independent EQ algorithm is used to at least adjust the frequency, gain and bandwidth of the interval signal.

[0018] As an optional implementation, the method further includes:

[0019] Energy processing is performed on the interval signal that has completed independent EQ processing.

[0020] As an optional implementation manner, the step of superimposing the processed signals of each interval to obtain the target signal includes:

[0021] An adder is provided to superimpose each processed interval signal based on the frequency division base point to obtain a continuous target signal.

[0022] As an optional implementation manner, after obtaining the target signal by superimposing the processed signals in each interval, the method further includes:

[0023] A dynamic filter is set to continuously optimize the target signal based on the frequency band parameters of each interval signal output by the static filter.

[0024] A second aspect of an embodiment of the present invention discloses an audio control system, characterized by comprising:

[0025] An EQ processing module, used to perform EQ processing on the input audio signal;

[0026] A static filtering module, configured to split the audio signal into a plurality of interval signals;

[0027] A DRC processing module, configured to perform DRC processing on the plurality of interval signals;

[0028] an adding module, configured to superimpose the plurality of interval signals into a target signal;

[0029] The dynamic filtering module is used to continuously optimize the target signal.

[0030] As an optional implementation, the EQ processing module performs global EQ processing on the input audio signal, the static filtering module splits the audio signal that has been EQ processed into several interval signals, the DRC module performs independent DRC processing on each interval signal, and the EQ processing module is also used to perform independent EQ processing on each interval signal that has completed independent DRC processing. The addition module superimposes several interval signals that have completed independent EQ processing into the target signal, and the target signal is optimized by the dynamic filtering module and output to the power amplifier.

[0031] As an optional implementation, the target signal is output through an I2S audio interface.

[0032] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0033] In this embodiment of the present invention, after performing global EQ on the audio signal, the audio signal is further divided into several frequency-segmented signals, which are then subjected to independent DRC and EQ processing, respectively, before being superimposed to obtain the target signal. Thus, the crossover point setting and independent processing of each frequency-segmented signal ensure that the adjustment process does not affect unintended frequency bands, ultimately achieving a timbre that matches the target parameters, significantly improving the flexibility and accuracy of audio adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 This is a schematic diagram of the working process of an independent control method for an audio frequency division equalizer disclosed in an embodiment of the present invention;

[0036] Figure 2 This is a data flow diagram of an independent control method for an audio frequency division equalizer disclosed in an embodiment of the present invention;

[0037] Figure 3 It is a structural diagram of an audio control system disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] It should be noted that the terms "first," "second," "third," "fourth," etc. in the description and claims of the present invention are used to distinguish different objects rather than to describe a specific order. The terms "including" and "having," as well as any variations thereof, in the embodiments of the present invention, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or are inherent to these processes, methods, products, or apparatuses.

[0040] Example 1

[0041] See also Figure 1 and Figure 2 ,like Figure 1 As shown, an independent control method of an audio frequency division equalizer disclosed in an embodiment of the present invention includes the following steps:

[0042] 101. Perform global EQ processing on the audio signal.

[0043] In this embodiment, a global EQ process is first performed on the audio signal according to the performance parameters of the playback device and the target parameters of the playback requirements, so as to make the tone brighter and the noise lower.

[0044] 102. Based on a frequency division base point, divide the audio signal into a plurality of interval signals.

[0045] In this embodiment, different frequency bands within the same audio signal require different emphasis due to their different timbre sources. For example, the low-pass band is primarily low-frequency musical sounds, requiring adjustment to enhance their expressiveness, while the band-pass band is primarily vocal, requiring adjustment to enhance their brightness and clarity. However, the global EQ process in step 101 cannot specifically address the varying requirements of different frequency bands. Therefore, this approach utilizes frequency division of the audio signal to independently process signals in intervals with different tuning requirements.

[0046] As an optional implementation, a static filter is provided to divide the input audio signal into a plurality of interval signals according to a frequency division base point;

[0047] The interval signal includes at least a low-pass interval, a band-pass interval and a high-pass interval.

[0048] Specifically, a number of frequency division base points are selected according to the playback requirements, and the static filter accurately splits the frequency bands of the audio signal based on the frequency division base points for subsequent independent frequency division adjustment.

[0049] As another optional implementation, the frequency band positions and number of the frequency division base points can be adjusted based on different playback and tuning requirements. For example, assuming the current audio signal is a chorus audio, which includes content such as alto, baritone, soprano, bass accompaniment and treble ensemble, in order to make the above content clear and well presented, it is necessary to accurately divide the frequency band of each content in a targeted manner. Therefore, further detailed division can be made based on the low-pass interval, band-pass interval and high-pass interval to ensure that the frequency band corresponding to each content can be well tuned.

[0050] It is understandable that although the frequency division base point can be accurately split, there are naturally overlapping parts in the frequency band of each part of the content. Therefore, there is no specific rule for the calibration of the frequency division base point. Instead, it is necessary to classify the frequency bands corresponding to the specific content that needs to be highlighted into the same interval signal as completely as possible according to the playback requirements.

[0051] 103. Perform independent DRC processing and independent EQ processing on each interval signal.

[0052] In this embodiment, each interval signal is independently DRC and EQ processed to ensure that the timbre of a specific channel is accurately adjusted and is not mixed with other channels.

[0053] As an optional implementation, an independent DRC algorithm and an independent EQ algorithm are configured for each interval signal;

[0054] The independent DRC algorithm adjusts the dynamic control range of the corresponding interval signal based on the calibrated dynamic range;

[0055] The independent EQ algorithm adjusts the equalization parameters of the corresponding interval signal based on the calibrated equalization range.

[0056] Specifically, the independent DRC algorithm and independent EQ algorithm corresponding to each interval signal not only independently process the interval signal based on the calibrated dynamic range and calibrated equalization range, but also fully consider the connection relationship with adjacent channels to ensure that the interval signals will not produce abrupt changes in timbre after superposition, avoiding popping and breaking sounds.

[0057] As an optional implementation, the independent EQ algorithm is used to adjust at least the frequency, gain and bandwidth ratio of the interval signal.

[0058] Here, the independent EQ algorithm at least processes the frequency, gain and bandwidth ratio of the interval signal. When faced with higher-resolution audio signals and higher tuning requirements, or when faced with more expressive power amplifier equipment, other tuning parameters can be appropriately introduced for processing. The tuning parameters involved in the independent DRC algorithm and the independent EQ algorithm are not limited here.

[0059] As an optional implementation, energy processing is performed on the interval signal that has completed independent EQ processing.

[0060] Specifically, the interval signal may lose energy during the tuning process. In order to ensure the output effect, energy processing is performed on the tuned interval signal to ensure that the signal does not attenuate and remains stable.

[0061] 104. Superimpose each processed interval signal to obtain a target signal.

[0062] In this embodiment, the signals of each interval are superimposed after tuning is completed to restore a complete target signal.

[0063] As an optional implementation, an adder is provided to superimpose each processed interval signal based on the frequency division base point to obtain a continuous target signal.

[0064] Here, each interval signal is superimposed and restored according to the split order of the frequency division base point. The superposition operation will not affect the audio parameters of the target signal. Therefore, the interval signal that has been accurately frequency-modulated can be superimposed into a continuous target signal, and the detailed adjustments made in each frequency band interval can be perfectly retained.

[0065] As another optional implementation, after the target signal is obtained by superimposing each processed interval signal, a dynamic filter is set to continuously optimize the target signal based on the frequency band parameters of each interval signal output by the static filter.

[0066] Specifically, the target signal is continuously optimized based on the frequency band parameters of the interval signal split and output by the static filter, making the target signal more stable as a whole and the combination at the frequency division base point smoother, further eliminating the popping and breaking sounds that may occur after the frequency division processing, and improving the audio expressiveness of the target signal.

[0067] Example 2

[0068] See also Figure 3 .like Figure 3 As shown, the audio control system may include:

[0069] An EQ processing module, used to perform EQ processing on the input audio signal;

[0070] Static filtering module, used to split the audio signal into several interval signals;

[0071] A DRC processing module, for performing DRC processing on a plurality of interval signals;

[0072] An addition module, used to superimpose several interval signals into a target signal;

[0073] Dynamic filtering module is used to continuously optimize the target signal.

[0074] In this embodiment, after performing global EQ processing on the audio signal, the audio signal is further divided into a number of interval signals, and independent DRC processing and independent EQ processing are performed on the interval signals in a distributed manner, and then superimposed to obtain a target signal.

[0075] As an optional implementation, the EQ processing module performs global EQ processing on the input audio signal, the static filtering module splits the audio signal that has been EQ processed into several interval signals, the DRC module performs independent DRC processing on each interval signal, and the EQ processing module is also used to perform independent EQ processing on each interval signal that has completed independent DRC processing. The addition module superimposes several interval signals that have completed independent EQ processing into a target signal, and the target signal is optimized by the dynamic filtering module and output to the power amplifier.

[0076] In this embodiment, the target signal is output through the I2S audio interface with high quality and high fidelity.

[0077] As an optional implementation, the target signal is output through an I2S audio interface.

[0078] In this embodiment of the present invention, after performing global EQ on the audio signal, the audio signal is further divided into several frequency-segmented signals, which are then subjected to independent DRC and EQ processing, respectively, before being superimposed to obtain the target signal. Thus, the crossover point setting and independent processing of each frequency-segmented signal ensure that the adjustment process does not affect unintended frequency bands, ultimately achieving a timbre that matches the target parameters, significantly improving the flexibility and accuracy of audio adjustment.

Claims

1. A method for independent control of an audio frequency division equalizer, characterized in that: The method comprises: Perform global EQ processing on audio signals; Based on a frequency division base point, dividing the audio signal into a plurality of interval signals; Perform independent DRC processing and independent EQ processing on each interval signal; The target signal is obtained by superimposing the processed signals of each interval.

2. The method for independent control of an audio frequency division equalizer according to claim 1, characterized in that: The step of dividing the audio signal into a plurality of interval signals based on a frequency division base point includes: Setting a static filter to divide the input audio signal into a plurality of interval signals according to a frequency division base point; The interval signal at least includes a low-pass interval, a band-pass interval and a high-pass interval.

3. The method for independent control of an audio frequency division equalizer according to claim 2, wherein: The performing independent DRC processing and independent EQ processing on each interval signal includes: Configure independent DRC algorithm and independent EQ algorithm for each interval signal; The independent DRC algorithm adjusts the dynamic control range of the corresponding interval signal based on the calibrated dynamic range; The independent EQ algorithm adjusts the equalization parameters of the corresponding interval signal based on the calibrated equalization range.

4. The method for independent control of an audio frequency division equalizer according to claim 3, wherein: The method further comprises: The independent EQ algorithm is used to at least adjust the frequency, gain and bandwidth of the interval signal.

5. The method for independent control of an audio frequency division equalizer according to claim 3, wherein: The method further comprises: Energy processing is performed on the interval signal that has completed independent EQ processing.

6. The method for independent control of an audio frequency division equalizer according to claim 2, wherein: The superposition processing of each processed interval signal to obtain the target signal includes: An adder is provided to superimpose each processed interval signal based on the frequency division base point to obtain a continuous target signal.

7. The method for independent control of an audio frequency division equalizer according to claim 6, characterized in that: After obtaining the target signal by superimposing the processed signals in each interval, the method further includes: A dynamic filter is set to continuously optimize the target signal based on the frequency band parameters of each interval signal output by the static filter.

8. An audio control system, characterized in that: include: An EQ processing module, used to perform EQ processing on the input audio signal; A static filtering module, configured to split the audio signal into a plurality of interval signals; A DRC processing module, configured to perform DRC processing on the plurality of interval signals; an adding module, configured to superimpose the plurality of interval signals into a target signal; The dynamic filtering module is used to continuously optimize the target signal.

9. The audio control system according to claim 8, characterized in that: include: The EQ processing module performs global EQ processing on the input audio signal, the static filtering module splits the audio signal after EQ processing into several interval signals, the DRC module performs independent DRC processing on each interval signal, and the EQ processing module is also used to perform independent EQ processing on each interval signal that has completed independent DRC processing. The addition module superimposes several interval signals that have completed independent EQ processing into the target signal, and the target signal is optimized by the dynamic filtering module and output to the power amplifier.

10. The audio control system according to claim 9, characterized in that: include: The target signal is output through the I2S audio interface.

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