CN113053347A - Target frequency response detection method and system for noise reduction earphone feedforward filter - Google Patents
Target frequency response detection method and system for noise reduction earphone feedforward filter Download PDFInfo
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17853—Methods, e.g. algorithms; Devices of the filter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
- G10K2210/1081—Earphones, e.g. for telephones, ear protectors or headsets
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
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- G10K2210/301—Computational
- G10K2210/3027—Feedforward
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- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/301—Computational
- G10K2210/3028—Filtering, e.g. Kalman filters or special analogue or digital filters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2203/00—Details of circuits for transducers, loudspeakers or microphones covered by H04R3/00 but not provided for in any of its subgroups
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
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Abstract
The invention relates to the technical field of active noise control, in particular to a method and a system for detecting target frequency response of a feedforward filter of a noise reduction earphone, wherein the method comprises the following steps: s100: closing the feedforward noise reduction of the earphone, and measuring to obtain a passive noise reduction frequency response; s200: configuring a feedforward filter into n groups of different preset values, measuring the frequency response from an external sound box corresponding to each group of preset values to a microphone of sound acquisition equipment, wherein n is more than or equal to 2; s300: calculating the total frequency response of the earphone leakage frequency response and the earphone digital circuit frequency response, the digital circuit frequency response and the total frequency response from an external sound box to an earphone microphone and from an earphone loudspeaker to a sound acquisition equipment microphone; s400: and calculating to obtain the target frequency response of the noise reduction earphone feedforward filter. According to the method and the system for detecting the target frequency response of the noise reduction earphone feedforward filter, the feedforward filter is tested through external equipment, audio data in the earphone do not need to be derived, and the test complexity is simplified; and a more accurate target frequency response result can be obtained by considering the earphone leakage path.
Description
Technical Field
The invention relates to the technical field of active noise control, in particular to a method and a system for detecting target frequency response of a feedforward filter of a noise reduction earphone.
Background
With the continuous development of industrialization, noise pollution gradually becomes an important problem affecting people's life, and aiming at noise problem treatment, the noise problem treatment can be mainly divided into two categories: active noise reduction (ANC) and passive noise reduction (PNC). Passive noise reduction has a poor ability to handle low frequency noise, while active noise reduction can effectively suppress low frequency noise by means of destructive interference. With the increasing sophistication of theoretical and technical solutions to various problems, the trend in ANC is towards more extensive algorithms to suppress complex noise patterns to achieve a more perfect listening experience.
For the current ANC algorithm, a method of fitting a filter to a target frequency response is mostly adopted, and therefore, the measurement accuracy of the target frequency response also greatly affects the final performance of the noise reduction earphone. The traditional target frequency response measuring method needs to measure the channel response inside the earphone, on one hand, the complexity and the time length of detection are increased, on the other hand, more error factors are introduced, and the noise reduction quality is reduced. In view of the above limitations, a new method for detecting a target frequency response is needed to improve ANC performance.
Disclosure of Invention
The invention provides a target frequency response detection method and a target frequency response detection system for a noise reduction earphone feedforward filter, wherein the feedforward filter is tested through external equipment, audio data in the earphone does not need to be derived, and the test complexity is simplified; and a more accurate target frequency response result can be obtained by considering the earphone leakage path.
In order to solve the technical problem, the present application provides the following technical solutions:
a target frequency response detection method for a noise reduction earphone feedforward filter comprises the following steps:
s100: closing the feedforward noise reduction of the earphone, and measuring to obtain a passive noise reduction frequency response;
s200: starting and configuring a feedforward filter of the earphone to n groups of different preset values, and measuring the frequency response from an external sound box corresponding to each group of preset values to a microphone of sound collection equipment, wherein n is more than or equal to 2;
s300: calculating the total frequency response of the earphone leakage frequency response and the earphone digital circuit frequency response according to the measurement results of S100 and S200, and calculating the total frequency response of the earphone digital circuit frequency response and the total frequency response from an external sound box to an earphone microphone and from an earphone loudspeaker to a sound acquisition equipment microphone;
s400: and calculating to obtain the target frequency response of the noise reduction earphone feedforward filter.
Further, still include:
s90: fixing a noise reduction earphone, and connecting the audio analysis equipment with an external sound box and a microphone of sound acquisition equipment; the sound collection equipment is an artificial ear or a dummy head, and the audio analysis equipment comprises an audio analyzer or a computer and a sound card.
Further, the S300 includes:
s301: calculating the frequency response of the closed loop response;
s302: and calculating the frequency response from the external sound box to the microphone of the sound acquisition equipment.
Further, the S301 includes:
s3011: the total signal frequency response at the headset microphone is:
X(z)+Y(z)E(z)
wherein, x (z) is the signal frequency response of the external sound box at the earphone microphone, and y (z) is the output frequency response at the earphone loudspeaker;
s3012: according to the S3011, the output frequency response of the earphone loudspeaker is as follows:
Y(z)＝C(z)P(z)[X(z)+Y(z)E(z)]
wherein, P (z) is the frequency response of the noise reduction earphone digital circuit; c (z) is the feedforward filter frequency response; e (z) is the frequency response from the earphone loudspeaker to the external microphone of the earphone, including the frequency response of the earphone loudspeaker, the acoustic frequency response leaked from the earphone loudspeaker to the earphone microphone and the frequency response of the earphone microphone;
s3013: obtaining the frequency response of the closed loop response according to the following formula:
where H (z) is the frequency response of the closed loop response.
Further, in S302, the frequency response from the external speaker to the microphone of the sound collection device is:
wherein, a (z) is a passive noise reduction frequency response, d (z) is a frequency response from the earphone speaker to the microphone of the sound collection device, including a frequency response from the earphone speaker, an acoustic frequency response from the earphone speaker to the microphone of the sound collection device via the ear canal, and a frequency response from the microphone of the sound collection device.
Further, the S400 includes:
s401: the multiple groups of data brought into S200 are sent to a frequency response equation of S302, and the total frequency response of the earphone leakage frequency response and the earphone digital circuit frequency response, the earphone digital circuit frequency response and the total frequency response from an external sound box to an earphone microphone and from an earphone loudspeaker to a sound acquisition equipment microphone are obtained;
s402: and constructing a target frequency response solving equation according to the target operation mode of the noise reduction earphone and solving to obtain the target frequency response.
Further, in S401, if n is 2, solving is performed by using a simultaneous equation set; and if n is greater than 2, solving by adopting a linear programming mode to obtain the target frequency response of the noise reduction earphone feedforward filter.
Further, the target operation modes of the noise reduction headphone in S402 include a noise reduction mode and a pass-through mode.
Further, when the target operation mode in S402 is the noise reduction mode, the target frequency response solution equation is as follows:
wherein, f (z) is a frequency response from an external sound box to a microphone of the sound collection device, m (z) is e (z) p (z), m (z) is a total frequency response of a headphone leakage frequency response and a headphone digital circuit frequency response: n (z) ═ b (z) d (z) p (z), n (z) is the headphone digital circuit frequency response and the total frequency response of the external loudspeaker to the headphone microphone and the headphone loudspeaker to the sound collection device microphone.
Furthermore, the application also discloses a target frequency response detection system of the noise reduction earphone feedforward filter, and the target frequency response detection method of the noise reduction earphone feedforward filter is used.
The technical scheme of the invention has the beneficial effects that:
compared with the traditional target frequency response measuring method which needs to measure the channel response inside the earphone, the technical scheme of the invention tests the feedforward filter through the external equipment without leading out the audio data inside the earphone, thereby simplifying the test complexity; meanwhile, a leakage path of the earphone is considered, so that a more accurate target frequency response result can be obtained, and the noise reduction performance of the noise reduction earphone is improved.
Drawings
FIG. 1 is a flowchart illustrating the testing of a method and system for detecting a target frequency response of a feedforward filter of a noise reduction headphone according to an embodiment of the present invention;
FIG. 2 is a diagram of a feedforward active noise control system in an embodiment of a method and system for detecting a target frequency response of a feedforward filter of a noise reduction headphone in accordance with the present invention;
FIG. 3 is a diagram of a test process data signal in an embodiment of a method and system for detecting a target frequency response of a feedforward filter of a noise reduction headphone.
Detailed Description
The following is further detailed by way of specific embodiments:
as shown in fig. 3, the present embodiment uses an audio analysis device for detection and analysis, and the audio analysis device is connected to an external speaker and a microphone of a sound collection device. When the audio analysis device works specifically, the audio analysis device outputs sound signals of 20 Hz-20 kHz frequency bands, and the sound signals are played through an external sound box. When the noise reduction of the earphone is closed, the sound signal is obtained by the sound acquisition equipment through the earphone isolation and then input to the audio analysis equipment; when the noise reduction of the earphone is started, sound signals pass through a microphone outside the earphone, then pass through a feedforward filter inside the earphone, then are played through a loudspeaker in the earphone and are respectively acquired by sound acquisition equipment and the earphone microphone, wherein the sound signals acquired by the earphone microphone are called leakage signals, and the sound signals acquired by the sound acquisition equipment are input into audio analysis equipment for processing.
As shown in FIG. 2, the signal process in FIG. 3 is represented by a control system block diagram, where the sound signal output by the microphone outside the earphone is x (n), one path passes through the primary channel P (z), the other path passes through the secondary channel G (z) and the feedforward filter W (z), and the two signals are superimposed to generate destructive interference, thereby realizing feedforward noise reduction.
As shown in fig. 1, the method for detecting a target frequency response of a feedforward filter of a noise reduction headphone of this embodiment includes the following steps:
s90: fixing a noise reduction earphone, and connecting the audio analysis equipment with an external sound box and a microphone of sound acquisition equipment; the sound collection equipment is an artificial ear or a dummy head, and the audio analysis equipment comprises an audio analyzer or a computer and a sound card.
S100: closing the feedforward noise reduction of the earphone, and measuring to obtain a passive noise reduction frequency response;
s200: starting and configuring a feedforward filter of the earphone to n groups of different preset values, and measuring the frequency response from an external sound box corresponding to each group of preset values to a microphone of sound collection equipment, wherein n is more than or equal to 2;
s300: calculating the total frequency response of the earphone leakage frequency response and the earphone digital circuit frequency response according to the measurement results of S100 and S200, and calculating the total frequency response of the earphone digital circuit frequency response and the total frequency response from an external sound box to an earphone microphone and from an earphone loudspeaker to a sound acquisition equipment microphone;
s400: and calculating to obtain the target frequency response of the noise reduction earphone feedforward filter.
Specifically, in this embodiment, the sound collection device in step 1 is an artificial ear or a dummy head, and the audio analysis device is an audio analyzer or a computer plus a sound card.
More specifically, in this embodiment, S300 further includes deriving the relation between the frequency response c (z) of the feedforward filter and the frequency response f (z) from the external loudspeaker to the microphone of the sound collection device:
note that p (z) is the digital input to the speaker digital output link from the microphone, which reduces the frequency response of the headset digital circuitry. And B (z) is the frequency response from the external sound box to the earphone microphone, including the frequency response of the external sound box, the acoustic frequency response from the external sound box to the earphone microphone through the air and the frequency response of the earphone microphone. And D (z) is the frequency response from the earphone loudspeaker to the microphone of the sound collection device, including the frequency response from the earphone loudspeaker, the acoustic frequency response from the earphone loudspeaker to the microphone of the sound collection device through the ear canal and the frequency response from the microphone of the sound collection device. And E (z) is the frequency response from the earphone loudspeaker to the external microphone of the earphone, including the frequency response from the earphone loudspeaker, the acoustic frequency response from the earphone loudspeaker leaking to the earphone microphone and the frequency response from the earphone microphone.
For a feedback system consisting of the earphone microphone, the frequency response C (z) of the feedforward filter, the earphone loudspeaker and the leakage frequency response E (z), assuming that the signal frequency response of the external sound box at the earphone microphone is X (z), the output frequency response at the earphone loudspeaker is Y (z), the total signal frequency response at the earphone microphone is:
X(z)+Y(z)E(z)
the signal passes through a headphone digital circuit P (z) and a feedforward filter C (z) and is output at a headphone loudspeaker, namely:
Y(z)＝C(z)P(z)[X(z)+Y(z)E(z)]
the frequency response of the closed loop response can be obtained as follows:
then, the frequency response from the external speaker to the microphone of the sound collection device is:
m (z), e (z), p (z), and n (z), b (z), d (z), p (z), then:
[F(z)-A(z)][1-C(z)M(z)]＝C(z)N(z)
[F(z)-A(z)]C(z)M(z)+C(z)N(z)＝F(z)-A(z)
in this embodiment, taking n-2 as an example, solving is performed by using a simultaneous equation set; in other embodiments of the present application, if n >2, a linear programming approach is used for solving.
Two sets of measurements were substituted into the above equation, including:
solving a linear equation of two to obtain:
in the noise reduction mode of the noise reduction earphone, the filtering aim is to minimize the sound at the sound acquisition equipment; in the transparent mode, the filtering aim is to enable the frequency response amplitude of each frequency point at the sound acquisition equipment to be approximately the same.
More specifically, in the present embodiment, taking the noise reduction mode as an example, the feedforward filter is designed such that:
the target frequency response is:
the embodiment also discloses a target frequency response detection system of the noise reduction earphone feedforward filter, and the target frequency response detection method of the noise reduction earphone feedforward filter is used.
The above are merely examples of the present invention, and the present invention is not limited to the field related to this embodiment, and the common general knowledge of the known specific structures and characteristics in the schemes is not described herein too much, and those skilled in the art can know all the common technical knowledge in the technical field before the application date or the priority date, can know all the prior art in this field, and have the ability to apply the conventional experimental means before this date, and those skilled in the art can combine their own ability to perfect and implement the scheme, and some typical known structures or known methods should not become barriers to the implementation of the present invention by those skilled in the art in light of the teaching provided in the present application. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. A target frequency response detection method of a noise reduction earphone feedforward filter is characterized by comprising the following steps: the method comprises the following steps:
s100: closing the feedforward noise reduction of the earphone, and measuring to obtain a passive noise reduction frequency response;
s200: starting and configuring a feedforward filter of the earphone to n groups of different preset values, and measuring the frequency response from an external sound box corresponding to each group of preset values to a microphone of sound collection equipment, wherein n is more than or equal to 2;
s300: calculating the total frequency response of the earphone leakage frequency response and the earphone digital circuit frequency response according to the measurement results of S100 and S200, and calculating the total frequency response of the earphone digital circuit frequency response and the total frequency response from an external sound box to an earphone microphone and from an earphone loudspeaker to a sound acquisition equipment microphone;
s400: and calculating to obtain the target frequency response of the noise reduction earphone feedforward filter.
2. The method of claim 1, wherein the target frequency response of the noise reduction headphone feed forward filter is detected by: further comprising:
s90: fixing a noise reduction earphone, and connecting the audio analysis equipment with an external sound box and a microphone of sound acquisition equipment; the sound collection equipment is an artificial ear or a dummy head, and the audio analysis equipment comprises an audio analyzer or a computer and a sound card.
3. The method of claim 1, wherein the target frequency response of the noise reduction headphone feed forward filter is detected by: the S300 includes:
s301: calculating the frequency response of the closed loop response;
s302: and calculating the frequency response from the external sound box to the microphone of the sound acquisition equipment.
4. The method of claim 3, wherein the target frequency response of the noise reduction headphone feed forward filter is detected by: the S301 includes:
s3011: the total signal frequency response at the headset microphone is:
X(z)+Y(z)E(z)
wherein, x (z) is the signal frequency response of the external sound box at the earphone microphone, and y (z) is the output frequency response at the earphone loudspeaker;
s3012: according to the S3011, the output frequency response of the earphone loudspeaker is as follows:
Y(z)＝C(z)P(z)[X(z)+Y(z)E(z)]
wherein, P (z) is the frequency response of the noise reduction earphone digital circuit; c (z) is the feedforward filter frequency response; e (z) is the frequency response from the earphone loudspeaker to the external microphone of the earphone, including the frequency response of the earphone loudspeaker, the acoustic frequency response leaked from the earphone loudspeaker to the earphone microphone and the frequency response of the earphone microphone;
s3013: obtaining the frequency response of the closed loop response according to the following formula:
where H (z) is the frequency response of the closed loop response.
5. The method of claim 4, wherein the target frequency response of the noise reduction headphone feed forward filter is detected by: in S302, the frequency response from the external speaker to the microphone of the sound collection device is:
wherein, a (z) is a passive noise reduction frequency response, d (z) is a frequency response from the earphone speaker to the microphone of the sound collection device, including a frequency response from the earphone speaker, an acoustic frequency response from the earphone speaker to the microphone of the sound collection device via the ear canal, and a frequency response from the microphone of the sound collection device.
6. The method of claim 3, wherein the target frequency response of the noise reduction headphone feed forward filter is detected by: the S400 includes:
s401: the multiple groups of data brought into S200 are sent to a frequency response equation of S302, and the total frequency response of the earphone leakage frequency response and the earphone digital circuit frequency response, the earphone digital circuit frequency response and the total frequency response from an external sound box to an earphone microphone and from an earphone loudspeaker to a sound acquisition equipment microphone are obtained;
s402: and constructing a target frequency response solving equation according to the target operation mode of the noise reduction earphone and solving to obtain the target frequency response.
7. The method of claim 6, wherein the target frequency response of the noise reduction headphone feed forward filter is detected by: if n is 2 in S401, solving in a simultaneous equation set manner; if n is more than 2, solving by adopting a linear programming mode to obtain the target frequency response of the noise reduction earphone feedforward filter.
8. The method of claim 7, wherein the target frequency response of the noise reduction headphone feed forward filter is detected by: the target operation mode of the noise reduction earphone in S402 includes a noise reduction mode and a pass-through mode.
9. The method of claim 8, wherein the target frequency response of the noise reduction headphone feed forward filter is detected by: when the target operation mode in S402 is the noise reduction mode, the target frequency response solution equation is as follows:
wherein, f (z) is a frequency response from an external sound box to a microphone of the sound collection device, m (z) is e (z) p (z), m (z) is a total frequency response of a headphone leakage frequency response and a headphone digital circuit frequency response: n (z) ═ b (z) d (z) p (z), n (z) is the headphone digital circuit frequency response and the total frequency response of the external loudspeaker to the headphone microphone and the headphone loudspeaker to the sound collection device microphone.
10. A target frequency response detection system of a noise reduction earphone feedforward filter is characterized in that: a noise reduction headphone feed forward filter target frequency response detection method according to any of claims 1-9 is used.
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| CN112312257A (en) * | 2020-09-08 | 2021-02-02 | 深圳市逸音科技有限公司 | Intelligent 3D earphone of making an uproar falls in initiative digit |
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