Noise reduction headphones, noise reduction method and apparatus, storage medium, and processor

Abstract

The present disclosure discloses noise reduction headphones, a noise reduction method and apparatus, a storage medium, and a processor. The noise reduction headphones include at least a first noise reduction channel including at least one first feedforward microphone, at least one feedback microphone, a first feedforward noise reduction processing unit, a feedback noise reduction processing unit, and a first speaker, and a second noise reduction channel including at least one second feedforward microphone, a second feedforward noise reduction processing unit, and a second speaker. The first feedforward noise reduction processing unit and the second feedforward noise reduction processing unit are used to process an environmental noise signal, and the feedback noise reduction processing unit is used to process an external ear canal noise signal. According to the present disclosure, since a plurality of feedforward noise reduction and feedback noise reduction used in related technologies are processed in the same channel, interference between microphone signal paths is likely to occur, and it is difficult to effectively widen and enhance the bandwidth and average depth of noise reduction, thus solving the problem.

Description

Cross - reference to related applications

[0001] This disclosure claims the priority of a Chinese patent application with an application number of 202210891939.6 and an application title of "Noise - reducing Headphones, Noise - reducing Method and Device, Storage Medium, and Processor", which was filed with the China National Intellectual Property Administration on July 27, 2022, and all of its content is incorporated herein by reference.

Technical Field

[0002] This disclosure relates to the technical field of headphone noise reduction, and specifically, to noise - reducing headphones, noise - reducing methods and devices, storage media, and processors.

Background Art

[0003] Active noise reduction technology is a technology that generates sound waves with the same amplitude and opposite phase as the noise signal and achieves the purpose of noise control by interfering and overlapping with the noise sound waves. Conventional control methods are usually divided into feed - forward control, feedback control, and hybrid control of feed - forward and feedback. Among them, the hybrid control of feed - forward and feedback has the best noise reduction effect. However, in the prior art, in order to enhance the noise reduction effect, it is often realized by using multiple feed - forward microphones and multiple feedback microphones. Although the number of microphones increases, the noise signals detected by multiple microphones are processed by only one noise - reducing channel. In such a processing method, channel interference is likely to occur, and it becomes difficult to effectively widen and strengthen the bandwidth and average depth of noise reduction, which affects the noise reduction effect.

[0004] Since multiple feed - forward noise reduction and feedback noise reduction used in related technologies are processed in the same channel, interference between microphone signal paths is likely to occur, and there is still no effective countermeasure proposed for the problem that it becomes difficult to effectively widen and strengthen the bandwidth and average depth of noise reduction.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The main object of the present disclosure is to provide a noise-canceling headphone, a noise-canceling method and apparatus, a storage medium, and a processor to solve the problem that since multiple feedforward noise reduction and feedback noise reduction used in related technologies are processed on the same channel, interference between microphone signal paths is likely to occur, making it difficult to effectively widen and strengthen the bandwidth and average depth of noise reduction.

Means for Solving the Problems

[0006] To achieve the above object, according to one aspect of the present disclosure, a noise-canceling headphone is provided. The noise-canceling headphone includes at least one first feedforward microphone, at least one feedback microphone, a first noise-canceling channel including at least a first feedforward noise reduction processing unit, a feedback noise reduction processing unit, and a first speaker, and a second noise-canceling channel including at least one second feedforward microphone, a second feedforward noise reduction processing unit, and a second speaker. The first feedforward noise reduction processing unit and the second feedforward noise reduction processing unit are used to process environmental noise signals, the feedback noise reduction processing unit is used to process ear canal noise signals, and the first speaker and the second speaker are used to reproduce noise removal signals generated by the first feedforward noise reduction processing unit, the second feedforward noise reduction processing unit, and the feedback noise reduction processing unit to achieve noise reduction.

[0007] Furthermore, the noise-canceling headphone further includes a noise signal processing unit configured to convert a noise signal in the form of an analog signal into a noise signal in the form of a digital signal.

[0008] Furthermore, the first speaker, the second speaker, and the feedback microphone are provided in the front cavity of the headphone cavity, the first feedforward microphone and the second feedforward microphone are provided in the rear cavity of the headphone cavity, and the front cavity and the rear cavity are two independent closed cavities.

[0009] To achieve the above object, according to one aspect of the present disclosure, a noise reduction method is provided. The method includes steps of performing noise detection by at least one first feedforward microphone to obtain a first target noise signal, performing noise detection by at least one feedback microphone to obtain a second target noise signal, performing noise detection by at least one second feedforward microphone to obtain a third target noise signal; performing noise removal processing on the first target noise signal and the second target noise signal by a first feedforward noise reduction processing unit and a feedback noise reduction processing unit to obtain a first target noise removal signal; performing noise reduction processing on the third target noise signal by a second feedforward noise reduction processing unit to obtain a second target noise removal signal corresponding to the third target noise signal; and reproducing the first target noise removal signal by a first speaker and reproducing the second target noise removal signal by a second speaker to achieve noise reduction.

[0010] Furthermore, the step of performing noise removal processing on the first target noise signal and the second target noise signal by the first feedforward noise reduction processing unit and the feedback noise reduction processing unit to obtain a first target noise removal signal includes: the step of performing noise reduction processing on the first target noise signal by the first feedforward noise reduction processing unit to obtain a feedforward noise removal signal corresponding to the first target noise signal; the step of performing noise reduction processing on the second noise reduction signal by the feedback noise reduction processing unit to obtain a feedback noise removal signal corresponding to the second target noise signal; and the step of superimposing the feedforward noise removal signal and the feedback noise removal signal to obtain the first target noise removal signal.

[0011] Furthermore, the step of performing noise detection by the at least one first feedforward microphone to obtain a first target noise signal includes: the step of detecting environmental noise by the at least one first feedforward microphone to obtain a first initial noise signal; the step of using the first initial noise signal as the first target noise signal when the first initial noise signal is a digital signal; and the step of performing analog / digital conversion on the first initial noise signal to obtain a processed first initial noise signal and using the processed first initial noise signal as the first target noise signal when the first initial noise signal is an analog signal.

[0012] Furthermore, when the first initial noise signal is an analog signal, the step of performing analog / digital conversion on the first initial noise signal to obtain a processed first initial noise signal includes: the step of performing gain adjustment on the first initial noise signal to obtain an adjusted first initial noise signal; and the step of performing analog / digital conversion on the adjusted first initial noise signal to obtain the processed first initial noise signal.

[0013] Furthermore, the step of reproducing the first target noise cancellation signal by the first speaker includes: converting the first target noise cancellation signal through digital / analog conversion to obtain a converted first target noise cancellation signal; performing an amplification process on the converted first target noise cancellation signal by a headphone amplifier to obtain an amplified first target noise cancellation signal; and reproducing the amplified first target noise cancellation signal by the first speaker.

[0014] To achieve the above object, according to one aspect of the present disclosure, a noise reduction device is provided. The device includes: a detection unit configured to perform noise detection by at least one first feedforward microphone to obtain a first target noise signal, perform noise detection by at least one feedback microphone to obtain a second target noise signal, and perform noise detection by at least one second feedforward microphone to obtain a third target noise signal; a first processing unit configured to perform noise cancellation processing on the first target noise signal and the second target noise signal by a first feedforward noise reduction processing unit and a feedback noise reduction processing unit to obtain a first target noise cancellation signal; a second processing unit configured to perform noise reduction processing on the third target noise signal by a second feedforward noise reduction processing unit to obtain a second target noise cancellation signal corresponding to the third target noise signal; and a reproduction unit configured to reproduce the first target noise cancellation signal by a first speaker and reproduce the second target noise cancellation signal by a second speaker to achieve noise reduction.

[0015] Furthermore, the first processing unit includes a first processing module configured to perform noise reduction processing on the first target noise signal by the first feedforward noise reduction processing unit to obtain a feedforward noise removal signal corresponding to the first target noise signal, a second processing module configured to perform noise reduction processing on the second noise reduction signal by the feedback noise reduction processing unit to obtain a feedback noise removal signal corresponding to the second target noise signal, and a third processing module configured to superimpose the feedforward noise removal signal and the feedback noise removal signal to obtain the first target noise removal signal.

[0016] Furthermore, the detection unit includes a detection module configured to detect environmental noise by the at least one first feedforward microphone to obtain a first initial noise signal, a determination module configured to use the first initial noise signal as the first target noise signal when the first initial noise signal is a digital signal, and a conversion module configured to perform analog / digital conversion on the first initial noise signal to obtain a processed first initial noise signal and use the processed first initial noise signal as the first target noise signal when the first initial noise signal is an analog signal.

[0017] Furthermore, the conversion module includes an adjustment sub-module configured to perform gain adjustment on the first initial noise signal to obtain an adjusted first initial noise signal, and a conversion sub-module configured to perform analog / digital conversion on the adjusted first initial noise signal to obtain the processed first initial noise signal.

[0018] Furthermore, the playback unit includes a third conversion module configured to perform digital-to-analog conversion on the first target noise cancellation signal to obtain the converted first target noise cancellation signal, a processing module configured to perform amplification processing on the converted first target noise cancellation signal by a headphone amplifier to obtain the amplified first target noise cancellation signal, and a playback module configured to play back the amplified first target noise cancellation signal by the first speaker.

[0019] To achieve the above object, according to one aspect of the present disclosure, there is provided a computer-readable storage medium storing a program, wherein when the program is executed, the device in which the storage medium is present is controlled to execute the noise reduction method according to any one of the above items.

[0020] To achieve the above object, according to one aspect of the present disclosure, there is provided a processor that executes a program, wherein when the program is executed, the processor executes the noise reduction method according to any one of the above items.

Advantages of the Invention

[0021] The noise reduction headphones proposed in the present disclosure include at least a first feedforward microphone, at least a feedback microphone, a first feedforward noise reduction processing unit, a feedback noise reduction processing unit, and a first speaker, which constitute a first noise reduction channel. The first noise reduction channel also includes at least a second feedforward microphone, a second feedforward noise reduction processing unit, and a second speaker, which constitute a second noise reduction channel. The first feedforward noise reduction processing unit and the second feedforward noise reduction processing unit are used to process environmental noise signals. The feedback noise reduction processing unit is used to process ear canal noise signals. The first speaker and the second speaker are used to reproduce the noise cancellation signals generated by the first feedforward noise reduction processing unit, the second feedforward noise reduction processing unit, and the feedback noise reduction processing unit to achieve noise reduction. In this way, since multiple feedforward noise reduction and feedback noise reduction used in related technologies are processed in the same channel, interference between microphone signal paths is likely to occur, and it is difficult to effectively expand and enhance the bandwidth and average depth of noise reduction. The above noise reduction headphones are provided with two independent noise reduction channels. The first noise reduction unit is constituted by at least a first feedforward microphone, at least a feedback microphone, a first feedforward noise reduction processing unit, a feedback noise reduction processing unit, and a first speaker, and noise reduction is achieved through hybrid control of double feed of feedforward and feedback via the first noise reduction unit. Also, the second noise reduction unit is constituted by at least a second feedforward microphone, a second feedforward noise reduction processing unit, and a second speaker, and feedforward noise reduction is achieved through the second noise reduction unit.In this way, by means of the noise removal technology of two independent noise reduction channels consisting of a hybrid type and a feedforward type, the noise reduction range of the headphones is improved, and by setting two independent noise reduction channels to process noise individually, the occurrence of channel interference can be effectively avoided, the bandwidth and depth of noise reduction are improved, and moreover, the effect of expanding the bandwidth of noise reduction and increasing the average depth is achieved.

Brief Description of the Drawings

[0022] The drawings constituting a part of the present disclosure are for further understanding of the present disclosure. The exemplary embodiments and their descriptions of the present disclosure are used to explain the present disclosure and do not unduly limit the present disclosure.

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0023] Unless there is a contradiction, the embodiments of the present disclosure and the features in the embodiments can be combined with each other. Hereinafter, the present disclosure will be described in detail with reference to the drawings in accordance with the embodiments.

[0024] For those skilled in the art to better understand the solution of the present disclosure, hereinafter, with reference to the drawings of the embodiments of the present disclosure, the technical solution of the embodiments of the present disclosure will be clearly and completely described. Naturally, the described embodiments are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments of the present disclosure, all other embodiments that can be obtained by those skilled in the art without inventive labor should belong to the protection scope of the present disclosure.

[0025] Note that the terms "first", "second", etc. in the description, claims, and the above drawings of the present disclosure are used to distinguish similar objects and are not necessarily for indicating a specific order or priority. The data used in this way is interchangeable in appropriate situations, and it should be understood that the embodiments of the present disclosure described herein can be implemented in an order other than the order illustrated or described herein. Also, the terms "comprising", "having", and any variations thereof are intended to include non-exclusive things. For example, a process, method, system, product, or device comprising a series of steps or units is not necessarily limited to the steps or units clearly listed, and may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0026] Hereinafter, for convenience of explanation, some of the nouns or terms mentioned in the embodiments of the present disclosure will be explained.

[0027] FF: Feedforward noise reduction technology.

[0028] FB: Feedback noise reduction technology.

[0029] Hybrid noise removal technology: Double-feed type active noise removal technology.

[0030] (Example 1) Hereinafter, the noise reduction headphones proposed in the present disclosure will be introduced. FIG. 1 is a schematic diagram of noise reduction headphones according to an embodiment of the present disclosure. As shown in FIG. 1, these noise reduction headphones are A first noise reduction channel including at least one first feedforward microphone, at least one feedback microphone, a first feedforward noise reduction processing unit, a feedback noise reduction processing unit, and a first speaker, and a second noise reduction channel including at least one second feedforward microphone, a second feedforward noise reduction processing unit, and a second speaker, wherein the first feedforward noise reduction processing unit and the second feedforward noise reduction processing unit are used to process an environmental noise signal, the feedback noise reduction processing unit is used to process an ear canal noise signal, and the first speaker and the second speaker are used to reproduce a noise removal signal generated by the first feedforward noise reduction processing unit, the second feedforward noise reduction processing unit, and the feedback noise reduction processing unit to achieve noise reduction.

[0031] Specifically, the noise reduction headphones according to the present disclosure include two independent noise reduction channels, namely a first noise reduction channel and a second noise reduction channel. The first noise reduction channel is constituted by at least one first feedforward microphone, at least one feedback microphone, a first feedforward noise reduction processing unit (FF), a feedback noise reduction processing unit (FB), and a first speaker, and the first noise reduction channel realizes feedforward and feedback noise reduction processing. The at least one first feedforward microphone detects a noise signal in the environment, the at least one feedback microphone detects an ear canal noise signal, and then the above noises are processed using the first feedforward noise reduction processing unit and the feedback noise reduction processing unit. Further, the second noise reduction channel is constituted by at least one second feedforward microphone, a second feedforward noise reduction processing unit, and a second speaker. The second feedforward microphone detects a noise signal in the environment, and then noise reduction processing is performed on the noise signal detected by the second feedforward microphone using the second feedforward noise reduction processing unit.

[0032] By using a multi-channel noise cancellation technology consisting of a feedforward type and Hybrid, the noise cancellation range of the headphones is improved, and by setting two independent noise reduction channels to process the noise individually, the occurrence of channel interference can be effectively avoided, improving the noise reduction effect of the noise reduction headphones.

[0033] In actual applications, the collected noise signal may be an analog signal or a digital signal. Therefore, the noise reduction headphones according to the embodiments of the present disclosure further include a noise signal processing unit configured to convert a noise signal in the form of an analog signal into a noise signal in the form of a digital signal.

[0034] Specifically, the first feedforward microphone, the second feedforward microphone, and the feedback microphone in the noise reduction headphones correspond to analog signals or digital signals. When the noise signal is an analog signal, the noise signal processing unit performs analog-to-digital conversion on the analog signal and then performs noise reduction processing. By the above steps, the noise processing range is expanded and the noise reduction effect is improved.

[0035] To achieve a better noise reduction effect, in the noise reduction headphones according to the embodiments of the present disclosure, the first feedforward microphone, the second feedforward microphone, the feedback microphone, the first speaker, and the second speaker are arranged as follows. That is, the first speaker, the second speaker, and the feedback microphone are provided in the front cavity of the headphone cavity, the first feedforward microphone and the second feedforward microphone are provided in the rear cavity of the headphone cavity, and the front cavity and the rear cavity are two independent closed cavities.

[0036] Specifically, since the first feedforward microphone and the second feedforward microphone are used to detect noise signals in the environment, they are provided on the back side of the first speaker and the second speaker (i.e., the rear cavity described above) and are exposed to the environment during the use of the noise-canceling headphones. Since the feedback microphone is used to detect ear canal noise, it is provided in the front cavity of the headphone cavity. In the case of in-ear type noise-canceling headphones, during use, the feedback microphone is inside the ear canal. As shown in FIG. 1, the first feedforward microphone and the second feedforward microphone are provided at different positions in one independent cavity, which is called the rear cavity of the headphone cavity. Also, the feedback microphone, the first speaker, and the second speaker are provided in the same cavity, which is called the front cavity of the headphone cavity. Note that the front cavity and the rear cavity are independently closed, which can ensure that the sound emitted from the speaker is not detected by the feedforward microphone and can effectively improve the noise reduction effect.

[0037] Note that the front cavity of the headphone cavity further includes a speaker front cavity and a speaker rear cavity.

[0038] Note that the positional relationship of the first feedforward microphone and the second feedforward microphone in the noise-canceling headphones is not limited. For example, in over-ear type noise-canceling headphones, the first feedforward microphone and the second feedforward microphone may be arranged vertically outside the ear cup.

[0039] Note that the number of the first feedforward microphone, the second feedforward microphone, and the feedback microphone is not specifically limited and can be set according to actual needs. By adopting an FF+FB multi-channel noise reduction processing unit in the noise-canceling headphones, the noise reduction bandwidth and the average depth are expanded.

[0040] The noise reduction headphones proposed in the present disclosure include at least a first feedforward microphone, at least a feedback microphone, a first feedforward noise reduction processing unit, a feedback noise reduction processing unit, and a first speaker, which form a first noise reduction channel, and at least a second feedforward microphone, a second feedforward noise reduction processing unit, and a second speaker, which form a second noise reduction channel. The first feedforward noise reduction processing unit and the second feedforward noise reduction processing unit are used to process environmental noise signals, the feedback noise reduction processing unit is used to process ear canal noise signals, and the first speaker and the second speaker are used to reproduce the noise removal signals generated by the first feedforward noise reduction processing unit, the second feedforward noise reduction processing unit, and the feedback noise reduction processing unit to achieve noise reduction. Thereby, since multiple feedforward noise reduction and feedback noise reduction used in related technologies are processed in the same channel, interference between microphone signal paths is likely to occur, and it is difficult to effectively expand and enhance the bandwidth and average depth of noise reduction. The above-mentioned noise reduction headphones are provided with two independent noise reduction channels. At least a first feedforward microphone, at least a feedback microphone, a first feedforward noise reduction processing unit, a feedback noise reduction processing unit, and a first speaker constitute a first noise reduction unit, and noise reduction by hybrid control of feedforward and feedback is achieved through the first noise reduction unit. Also, at least a second feedforward microphone, a second feedforward noise reduction processing unit, and a second speaker constitute a second noise reduction unit, and feedforward noise reduction is achieved through the second noise reduction unit.In this way, by combining the feedforward and double-feed noise reduction techniques with the outputs from two microphones, the noise reduction range of the headphones is improved. Also, by setting two independent noise reduction channels to process noise individually, the occurrence of channel interference can be effectively avoided, improving the bandwidth and depth of noise reduction. Moreover, the effect of broadening the noise reduction bandwidth and increasing the average depth is achieved.

[0041] (Embodiment 2) Hereinafter, the present invention will be described with reference to preferred implementation steps. FIG. 2 is a flowchart of a noise reduction method according to an embodiment of the present disclosure, and this noise reduction method is applied to the above-described noise reduction headphones. As shown in FIG. 2, this method includes the following steps S201 to S204.

[0042] In step S201, noise detection is performed by at least one first feedforward microphone to obtain a first target noise signal, noise detection is performed by at least one feedback microphone to obtain a second target noise signal, and noise detection is performed by at least one second feedforward microphone to obtain a third target noise signal.

[0043] In step S202, noise removal processing is performed on the first target noise signal and the second target noise signal by a first feedforward noise reduction processing unit and a feedback noise reduction processing unit to obtain a first target noise removal signal.

[0044] In step S203, noise reduction processing is performed on the third target noise signal by a second feedforward noise reduction processing unit to obtain a second target noise removal signal corresponding to the third target noise signal.

[0045] In step S204, the first target noise removal signal is reproduced by a first speaker, and the second target noise removal signal is reproduced by a second speaker to achieve noise reduction.

[0046] Specifically, the above noise reduction method is applied to the above noise reduction headphones, mainly detecting noise by the first feedforward microphone to obtain a first target noise signal, detecting noise by the feedback microphone to obtain a second target noise signal, and detecting noise by the second feedforward microphone to obtain a second target noise signal.

[0047] As shown in FIG. 3, noise removal processing is performed on the first target noise signal using the first feedforward noise reduction processing unit to obtain a feedforward noise removal signal, noise removal processing is performed on the second target noise signal using the feedback noise removal processing unit to obtain a feedback noise removal signal. Also, the feedforward noise removal signal and the feedback noise removal signal are superimposed to obtain the first target noise removal signal described above, and finally, the first target noise removal signal is reproduced using the first speaker to achieve noise removal.

[0048] Noise removal processing is performed on the third target noise signal using the second feedforward noise reduction processing unit to obtain a second target noise removal signal, and the second target noise removal signal is reproduced using the second speaker to achieve noise removal.

[0049] As described above, the first feedforward microphone and the second feedforward microphone are used to detect environmental noise, and then, by processing using two independent noise reduction channels, the bandwidth and average depth of noise reduction are extended. The multi-channel noise removal technology composed of the feedforward type and Hybrid can improve the noise removal range of the headphones and effectively avoid the occurrence of channel interference.

[0050] Since it is extremely important how to obtain the first target noise cancellation signal, in the noise reduction method according to the embodiments of the present disclosure, the first feed-forward noise reduction processing unit and the feedback noise reduction processing unit perform noise cancellation processing on the first target noise signal and the second target noise signal, and the step of obtaining the first target noise cancellation signal includes: the step of performing noise reduction processing on the first target noise signal by the first feed-forward noise reduction processing unit to obtain a feed-forward noise cancellation signal corresponding to the first target noise signal; the step of performing noise reduction processing on the second noise reduction signal by the feedback noise reduction processing unit to obtain a feedback noise cancellation signal corresponding to the second target noise signal; and the step of superimposing the feed-forward noise cancellation signal and the feedback noise cancellation signal to obtain the first target noise cancellation signal.

[0051] Specifically, as shown in FIG. 3, the first feed-forward noise reduction processing unit is used to perform noise cancellation processing on the first target noise signal to obtain a feed-forward noise cancellation signal, and the feedback noise cancellation processing unit is used to perform noise cancellation processing on the second target noise signal to obtain a feedback noise cancellation signal. Then, an adder superimposes the feed-forward noise cancellation signal and the feedback noise cancellation signal to obtain the first target noise cancellation signal described above.

[0052] While feed-forward noise reduction is easily achieved, the noise signals that can be collected in feedback noise reduction are close to those audible to the human ear, and further filter the noise not filtered by the feed-forward microphone. Therefore, the double active noise reduction of feed-forward and feedback improves the noise reduction effect.

[0053] In actual applications, the noise signal may be either an analog signal or a digital signal. Therefore, the first feedforward microphone, the second feedforward microphone, and the feedback microphone correspond to analog signals or digital signals. However, generally, since it is more efficient to process noise signals in the form of digital signals, in the noise reduction method according to the embodiments of the present disclosure, the step of detecting noise by at least one first feedforward microphone and obtaining a first target noise signal includes: detecting environmental noise by at least one first feedforward microphone to obtain a first initial noise signal; when the first initial noise signal is a digital signal, using the first initial noise signal as the first target noise signal; and when the first initial noise signal is an analog signal, performing analog / digital conversion on the first initial noise signal to obtain a processed first initial noise signal, and using the processed first initial noise signal as the first target noise signal.

[0054] Gain adjustment is performed on the first initial noise signal to obtain an adjusted first initial noise signal. Then, the adjusted first initial noise signal is subjected to analog / digital conversion to obtain a processed first initial noise signal.

[0055] Specifically, as shown in FIG. 3, environmental noise is detected by at least one first feedforward microphone to obtain a first initial noise signal. When the first initial noise signal is a digital signal, the first initial noise signal is used as the first target noise signal without any processing. When the first initial noise signal is an analog signal, the first initial noise signal is subjected to analog / digital conversion to obtain a processed first initial noise signal, and the processed first initial noise signal is used as the first target noise signal.

[0056] Gain adjustment is performed on the analog signal before analog / digital conversion, and then analog / digital conversion is performed. The converted analog signal is transmitted to a noise reduction processing unit for noise reduction processing.

[0057] In the noise reduction method according to an embodiment of the present disclosure, the step of reproducing the first target noise removal signal by the first speaker includes the steps of digital / analog converting the first target noise removal signal to obtain the converted first target noise removal signal, amplifying the converted first target noise removal signal by a headphone amplifier to obtain the amplified first target noise removal signal, and reproducing the amplified first target noise removal signal by the first speaker.

[0058] Specifically, after obtaining the first target noise removal signal, it is further necessary to digital / analog convert the first target noise removal signal into an analog signal form, then perform an amplification process on the converted noise removal signal by a headphone amplifier to obtain the amplified first target noise removal signal, and finally perform a process of reproducing the amplified first target noise removal signal by the first speaker. Through the above steps, the noise removal effect of the noise removal signal can be effectively improved, and the noise reduction effect of the headphones can be improved.

[0059] In the noise reduction method according to an embodiment of the present disclosure, noise detection is performed by at least one first feedforward microphone to obtain a first target noise signal, noise detection is performed by at least one feedback microphone to obtain a second target noise signal, noise detection is performed by at least one second feedforward microphone to obtain a third target noise signal; a step of obtaining a third target noise signal; a step of performing noise removal processing on the first target noise signal and the second target noise signal by a first feedforward noise reduction processing unit and a feedback noise reduction processing unit to obtain a first target noise removal signal; a step of performing noise reduction processing on the third target noise signal by a second feedforward noise reduction processing unit to obtain a second target noise removal signal corresponding to the third target noise signal; and a step of reproducing the first target noise removal signal by a first speaker and reproducing the second target noise removal signal by a second speaker to achieve noise reduction. Thus, since a plurality of feedforward noise reduction and feedback noise reduction used in the related art are processed in the same channel, interference between microphone signal paths is likely to occur, and it is difficult to effectively widen and enhance the bandwidth and average depth of noise reduction, which solves the problem. At least one first feedforward microphone, at least one feedback microphone, a first feedforward noise reduction processing unit, a feedback noise reduction processing unit, and a first speaker constitute a first noise reduction unit, and noise reduction by hybrid control of feedforward and feedback is realized through the first noise reduction unit. Further, at least one second feedforward microphone, a second feedforward noise reduction processing unit, and a second speaker constitute a second noise reduction unit, and feedforward noise reduction is realized through the second noise reduction unit.By using a multi-channel noise reduction technology consisting of a feed-forward type and Hybrid, the noise reduction range of the headphones is improved, and by setting two independent noise reduction channels to process noise individually, the occurrence of channel interference can be effectively avoided, improving the bandwidth and depth of noise reduction. Moreover, the effect of expanding the bandwidth of noise reduction and increasing the average depth is achieved.

[0060] Note that the steps shown in the flowchart of the drawings can be executed, for example, in a computer system by a group of computer-executable instructions, and although the flowchart shows a logical order, in some cases, the steps shown or described can be executed in an order different from the order here.

[0061] (Example 3) The embodiments of the present disclosure further provide a noise reduction device. Note that the noise reduction device of the embodiments of the present disclosure can be used to execute the noise reduction method according to the embodiments of the present disclosure. Hereinafter, the noise reduction device according to the embodiments of the present disclosure will be introduced.

[0062] FIG. 4 is a schematic diagram of a noise reduction device according to an embodiment of the present disclosure. As shown in FIG. 4, this device includes a detection unit 401, a first processing unit 402, a second processing unit 403, and a playback unit 404.

[0063] The detection unit 401 is configured to perform noise detection by at least one first feed-forward microphone to obtain a first target noise signal, perform noise detection by at least one feedback microphone to obtain a second target noise signal, and perform noise detection by at least one second feed-forward microphone to obtain a third target noise signal.

[0064] The first processing unit 402 is configured to perform noise removal processing on the first target noise signal and the second target noise signal by means of the first feedforward noise reduction processing unit and the feedback noise reduction processing unit, so as to obtain a first target noise removal signal.

[0065] The second processing unit 403 is configured to perform noise reduction processing on the third target noise signal by means of the second feedforward noise reduction processing unit, so as to obtain a second target noise removal signal corresponding to the third target noise signal.

[0066] The playback unit 404 is configured to play back the first target noise removal signal by means of the first speaker and play back the second target noise removal signal by means of the second speaker, so as to achieve noise reduction.

[0067] The noise reduction device according to an embodiment of the present disclosure performs noise detection by at least one first feedforward microphone to obtain a first target noise signal, performs noise detection by at least one feedback microphone to obtain a second target noise signal, performs noise detection by at least one second feedforward microphone to obtain a third target noise signal, a detection unit 401; a first processing unit 402 that performs noise removal processing on the first target noise signal and the second target noise signal by a first feedforward noise reduction processing unit and a feedback noise reduction processing unit to obtain a first target noise removal signal; a second processing unit 403 that performs noise reduction processing on the third target noise signal by a second feedforward noise reduction processing unit to obtain a second target noise removal signal corresponding to the third target noise signal; and a playback unit 404 that plays back the first target noise removal signal by a first speaker and plays back the second target noise removal signal by a second speaker to achieve noise reduction. Thereby, since a plurality of feedforward noise reduction and feedback noise reduction used in the related art are processed in the same channel, interference between microphone signal paths is likely to occur, and it is difficult to effectively widen and enhance the bandwidth and average depth of noise reduction, which solves the problem. At least one first feedforward microphone, at least one feedback microphone, a first feedforward noise reduction processing unit, a feedback noise reduction processing unit, and a first speaker constitute a first noise reduction unit, and noise reduction by hybrid control of feedforward and feedback is realized through the first noise reduction unit. Further, at least one second feedforward microphone, a second feedforward noise reduction processing unit, and a second speaker constitute a second noise reduction unit, and feedforward noise reduction is realized through the second noise reduction unit.The multi-channel noise cancellation technology consisting of a feed-forward type and Hybrid improves the noise cancellation range of the headphones. By setting two independent noise reduction channels to process noise individually, the occurrence of channel interference can be effectively avoided, the bandwidth and depth of noise reduction can be improved, and moreover, the effect of expanding the bandwidth of noise reduction and increasing the average depth can be achieved.

[0068] Optionally, in the noise reduction device according to an embodiment of the present disclosure, the first processing unit includes a first processing module configured to perform noise reduction processing on a first target noise signal by a first feed-forward noise reduction processing unit to obtain a feed-forward noise cancellation signal corresponding to the first target noise signal, a second processing module configured to perform noise reduction processing on a second noise reduction signal by a feedback noise reduction processing unit to obtain a feedback noise cancellation signal corresponding to the second target noise signal, and a third processing module configured to superimpose the feed-forward noise cancellation signal and the feedback noise cancellation signal to obtain a first target noise cancellation signal.

[0069] Optionally, in the noise reduction device according to an embodiment of the present disclosure, the detection unit includes a detection module configured to detect environmental noise by at least one first feed-forward microphone to obtain a first initial noise signal, a determination module configured to use the first initial noise signal as the first target noise signal when the first initial noise signal is a digital signal, and a conversion module configured to perform analog / digital conversion on the first initial noise signal to obtain a processed first initial noise signal and use the processed first initial noise signal as the first target noise signal when the first initial noise signal is an analog signal.

[0070] Optionally, in the noise reduction device according to an embodiment of the present disclosure, the conversion module includes an adjustment sub-module configured to perform gain adjustment on the first initial noise signal to obtain an adjusted first initial noise signal, and a conversion sub-module configured to perform analog / digital conversion on the adjusted first initial noise signal to obtain a processed first initial noise signal.

[0071] Optionally, in the noise reduction device according to an embodiment of the present disclosure, the playback unit includes a third conversion module configured to perform digital / analog conversion on the first target noise removal signal to obtain a converted first target noise removal signal, a processing module configured to perform amplification processing on the converted first target noise removal signal by a headphone amplifier to obtain an amplified first target noise removal signal, and a playback module configured to play back the amplified first target noise removal signal by a first speaker.

[0072] The noise reduction device includes a processor and a memory. The above-described detection unit 501, first processing unit 502, second processing unit 503, and playback unit 504 are all stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.

[0073] The processor includes cores, and the cores call corresponding program units from the memory. One or more cores may be provided, and noise reduction is realized by adjusting core parameters.

[0074] The memory may include forms such as volatile memory, random access memory (RAM), and / or non-volatile memory such as read-only memory (ROM) or flash memory (flash RAM) among computer-readable media. The memory includes at least one storage chip.

[0075] An embodiment of the present invention provides a computer-readable storage medium storing a program, which, when executed by a processor, realizes a noise reduction method.

[0076] An embodiment of the present invention provides a processor that executes a program, which, when executed, performs a noise reduction method. When the processor executes the program, it performs noise detection by at least one first feedforward microphone to obtain a first target noise signal, performs noise detection by at least one feedback microphone to obtain a second target noise signal, performs noise detection by at least one second feedforward microphone to obtain a third target noise signal; performs noise removal processing on the first target noise signal and the second target noise signal by a first feedforward noise reduction processing unit and a feedback noise reduction processing unit to obtain a first target noise removal signal; performs noise reduction processing on the third target noise signal by a second feedforward noise reduction processing unit to obtain a second target noise removal signal corresponding to the third target noise signal; and reproduces the first target noise removal signal by a first speaker and reproduces the second target noise removal signal by a second speaker to realize noise reduction.

[0077] Optionally, the step of performing noise removal processing on the first target noise signal and the second target noise signal by the first feedforward noise reduction processing unit and the feedback noise reduction processing unit to obtain a first target noise removal signal may include: the step of performing noise reduction processing on the first target noise signal by the first feedforward noise reduction processing unit to obtain a feedforward noise removal signal corresponding to the first target noise signal; the step of performing noise reduction processing on the second noise reduction signal by the feedback noise reduction processing unit to obtain a feedback noise removal signal corresponding to the second target noise signal; and the step of superimposing the feedforward noise removal signal and the feedback noise removal signal to obtain the first target noise removal signal.

[0078] Optionally, the step of performing noise detection by at least one first feedforward microphone to obtain a first target noise signal may include: the step of detecting environmental noise by at least one first feedforward microphone to obtain a first initial noise signal; when the first initial noise signal is a digital signal, using the first initial noise signal as the first target noise signal; and when the first initial noise signal is an analog signal, performing analog / digital conversion on the first initial noise signal to obtain a processed first initial noise signal, and using the processed first initial noise signal as the first target noise signal.

[0079] Optionally, when the first initial noise signal is an analog signal, the step of performing analog / digital conversion on the first initial noise signal to obtain a processed first initial noise signal and using the processed first initial noise signal as the first target noise signal may include: the step of performing gain adjustment on the first initial noise signal to obtain an adjusted first initial noise signal; and the step of performing analog / digital conversion on the adjusted first initial noise signal to obtain a processed first initial noise signal.

[0080] Optionally, the step of playing the first target noise cancellation signal by the first speaker may include: converting the first target noise cancellation signal through digital / analog conversion to obtain the converted first target noise cancellation signal; performing an amplification process on the converted first target noise cancellation signal by a headphone amplifier to obtain the amplified first target noise cancellation signal; and playing the amplified first target noise cancellation signal by the first speaker.

[0081] The device in this specification may be a server, a PC, a PAD, a mobile phone, or the like.

[0082] The present disclosure further provides a computer program product, which, when executed on a data processing device, performs noise detection by at least one first feedforward microphone to obtain a first target noise signal; performs noise detection by at least one feedback microphone to obtain a second target noise signal; performs noise detection by at least one second feedforward microphone to obtain a third target noise signal; performs noise cancellation processing on the first target noise signal and the second target noise signal by a first feedforward noise reduction processing unit and a feedback noise reduction processing unit to obtain a first target noise cancellation signal; performs noise reduction processing on the third target noise signal by a second feedforward noise reduction processing unit to obtain a second target noise cancellation signal corresponding to the third target noise signal; plays the first target noise cancellation signal by a first speaker and plays the second target noise cancellation signal by a second speaker to achieve noise reduction.

[0083] Optionally, the step of performing noise removal processing on the first target noise signal and the second target noise signal by the first feedforward noise reduction processing unit and the feedback noise reduction processing unit to obtain a first target noise removal signal may include: the step of performing noise reduction processing on the first target noise signal by the first feedforward noise reduction processing unit to obtain a feedforward noise removal signal corresponding to the first target noise signal; the step of performing noise reduction processing on the second noise reduction signal by the feedback noise reduction processing unit to obtain a feedback noise removal signal corresponding to the second target noise signal; and the step of superimposing the feedforward noise removal signal and the feedback noise removal signal to obtain the first target noise removal signal.

[0084] Optionally, the step of performing noise detection by at least one first feedforward microphone to obtain a first target noise signal may include: the step of detecting environmental noise by at least one first feedforward microphone to obtain a first initial noise signal; when the first initial noise signal is a digital signal, using the first initial noise signal as the first target noise signal; and when the first initial noise signal is an analog signal, performing analog / digital conversion on the first initial noise signal to obtain a processed first initial noise signal, and using the processed first initial noise signal as the first target noise signal.

[0085] Optionally, when the first initial noise signal is an analog signal, the step of performing analog / digital conversion on the first initial noise signal to obtain a processed first initial noise signal and using the processed first initial noise signal as the first target noise signal may include: the step of performing gain adjustment on the first initial noise signal to obtain an adjusted first initial noise signal; and the step of performing analog / digital conversion on the adjusted first initial noise signal to obtain a processed first initial noise signal.

[0086] Optionally, the step of playing the first target noise cancellation signal by the first speaker may include: converting the first target noise cancellation signal through digital / analog conversion to obtain the converted first target noise cancellation signal; performing an amplification process on the converted first target noise cancellation signal by a headphone amplifier to obtain the amplified first target noise cancellation signal; and playing the amplified first target noise cancellation signal by the first speaker.

[0087] Those skilled in the art will understand that the embodiments of the present disclosure may be provided as a method, a system, or a computer program product. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present disclosure may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) containing computer-usable program code.

[0088] The present disclosure will be described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as combinations of flows and / or blocks in the flowcharts and / or block diagrams, can be realized by computer program instructions. These computer program instructions are provided to the processor of a general-purpose computer, a dedicated computer, an embedded processor, or other programmable data processing device to generate a machine, thereby generating an apparatus for realizing the functions specified in one or more flows of the flowchart and / or one or more blocks of the block diagram by instructions executed by the processor of the computer or other programmable data processing device.

[0089] These computer program instructions may be stored in a computer-readable memory that can cause a computer or other programmable data processing device to operate in a particular manner, such that an article of manufacture is created that includes instruction means for implementing the functions specified in one or more flows of the flowchart and / or one or more blocks of the block diagram from the instructions stored in this computer-readable memory.

[0090] These computer program instructions may also be loaded onto a computer or other programmable data processing device, thereby causing a series of operational steps to be performed on the computer or other programmable device to generate a process implemented on the computer, and the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more flows of the flowchart and / or one or more blocks of the block diagram.

[0091] In a typical configuration, a computing device includes one or more processors (CPUs), an input / output interface, a network interface, and memory.

[0092] The memory may include forms such as volatile memory, random access memory (RAM), and / or non-volatile memory such as read-only memory (ROM) or flash memory (flash RAM) among computer-readable media. The memory is an example of a computer-readable medium.

[0093] A computer-readable medium includes volatile and non-volatile, removable and non-removable media that can implement information storage by any method or technology. The information may be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, compact cassette, magnetic tape, magnetic disk storage or other magnetic storage devices or other non-transitory media, and can be used to store information accessible by a computing device. As defined herein, a computer-readable medium does not include transitory media such as modulated data signals and carrier waves.

[0094] Note also that the term "comprising", "having", or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such process, method, article, or device. Without further limitation, an element limited by the phrase "comprising one..." does not exclude the presence of further identical elements in the process, method, article, or device that comprises the element.

[0095] Those skilled in the art will understand that embodiments of the present disclosure may be provided as a method, a system, or a computer program product. Therefore, the present disclosure can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Further, the present disclosure can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) containing computer-usable program code.

[0096] The above are only preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Those skilled in the art can make various changes and modifications to the present disclosure. Any modifications, equivalent replacements, improvements, etc. within the spirit and principles of the present disclosure should be included within the protection scope of the present disclosure.

Industrial Applicability

[0097] The noise reduction headphones according to embodiments of the present disclosure are provided with two independent noise reduction channels, and include at least one first feedforward microphone, at least one feedback microphone, a first feedforward noise reduction processing unit, a feedback noise reduction processing unit, and a first speaker to form a first noise reduction unit, and realize noise reduction by hybrid control of feedforward and feedback through the first noise reduction unit. Further, at least one second feedforward microphone, a second feedforward noise reduction processing unit, and a second speaker form a second noise reduction unit, and realize feedforward noise reduction through the second noise reduction unit. In this way, by combining the feedforward type and double-feed type noise removal technologies and the output by two microphones, the noise removal range of the headphones is improved, and by setting two independent noise reduction channels to process noise individually, the occurrence of channel interference can be effectively avoided, the bandwidth and depth of noise reduction are improved, and moreover, the effect of expanding the bandwidth of noise reduction and increasing the average depth is achieved.

Claims

1. A first noise reduction channel including at least one first feedforward microphone, at least one feedback microphone, a first feedforward noise reduction processing unit, a feedback noise reduction processing unit, and at least a first speaker; A second noise reduction channel including at least one second feedforward microphone, a second feedforward noise reduction processing unit, and at least a second speaker; The first feedforward noise reduction processing unit and the second feedforward noise reduction processing unit are used to process an environmental noise signal, the feedback noise reduction processing unit is used to process an ear canal noise signal, and the first speaker and the second speaker are used to reproduce a noise removal signal generated by the first feedforward noise reduction processing unit, the second feedforward noise reduction processing unit, and the feedback noise reduction processing unit to achieve noise reduction. Noise reduction headphones.

2. Further including a noise signal processing unit configured to convert a noise signal in the form of an analog signal into a noise signal in the form of a digital signal. The noise reduction headphones according to Claim 1.

3. The first speaker, the second speaker, and the feedback microphone are provided in a front cavity of a headphone cavity, the first feedforward microphone and the second feedforward microphone are provided in a rear cavity of the headphone cavity, and the front cavity and the rear cavity are two independent closed cavities. The noise reduction headphones according to Claim 1.

4. A noise reduction method applied to the noise reduction headphones according to any one of Claims 1 to 3, comprising: Performing noise detection by at least one first feedforward microphone to obtain a first target noise signal, performing noise detection by at least one feedback microphone to obtain a second target noise signal, and performing noise detection by at least one second feedforward microphone to obtain a third target noise signal; Performing noise removal processing on the first target noise signal and the second target noise signal by the first feedforward noise reduction processing unit and the feedback noise reduction processing unit to obtain a first target noise removal signal; Performing noise reduction processing on the third target noise signal by the second feedforward noise reduction processing unit to obtain a second target noise removal signal corresponding to the third target noise signal; Reproducing the first target noise removal signal by the first speaker and reproducing the second target noise removal signal by the second speaker to achieve noise reduction; A noise reduction method including the above steps.

5. The step of performing noise removal processing on the first target noise signal and the second target noise signal by the first feedforward noise reduction processing unit and the feedback noise reduction processing unit to obtain a first target noise removal signal includes: Performing noise reduction processing on the first target noise signal by the first feedforward noise reduction processing unit to obtain a feedforward noise removal signal corresponding to the first target noise signal; Performing noise reduction processing on the second noise reduction signal by the feedback noise reduction processing unit to obtain a feedback noise removal signal corresponding to the second target noise signal; Superimposing the feedforward noise removal signal and the feedback noise removal signal to obtain the first target noise removal signal, including the above steps. The method according to claim 4.

6. The step of performing noise detection by the at least one first feedforward microphone to obtain a first target noise signal includes: Detecting environmental noise by the at least one first feedforward microphone to obtain a first initial noise signal; When the first initial noise signal is a digital signal, setting the first initial noise signal as the first target noise signal; When the first initial noise signal is an analog signal, performing analog / digital conversion on the first initial noise signal to obtain a processed first initial noise signal, and setting the processed first initial noise signal as the first target noise signal, including the above steps. The method according to claim 4.

7. When the first initial noise signal is an analog signal, the step of performing analog / digital conversion on the first initial noise signal to obtain a processed first initial noise signal includes: performing gain adjustment on the first initial noise signal to obtain an adjusted first initial noise signal; and performing analog / digital conversion on the adjusted first initial noise signal to obtain the processed first initial noise signal. The method according to claim 6.

8. The step of reproducing the first target noise cancellation signal by the first speaker includes: performing digital / analog conversion on the first target noise cancellation signal to obtain a converted first target noise cancellation signal; performing amplification processing on the converted first target noise cancellation signal by a headphone amplifier to obtain an amplified first target noise cancellation signal; and reproducing the amplified first target noise cancellation signal by the first speaker. The method according to claim 4.

9. A noise reduction device applied to the noise reduction headphones according to any one of claims 1 to 3, comprising: a detection unit configured to perform noise detection by at least one first feedforward microphone to obtain a first target noise signal, perform noise detection by at least one feedback microphone to obtain a second target noise signal, and perform noise detection by at least one second feedforward microphone to obtain a third target noise signal; a first processing unit configured to perform noise cancellation processing on the first target noise signal and the second target noise signal by a first feedforward noise reduction processing unit and a feedback noise reduction processing unit to obtain a first target noise cancellation signal; a second processing unit configured to perform noise reduction processing on the third target noise signal by a second feedforward noise reduction processing unit to obtain a second target noise cancellation signal corresponding to the third target noise signal; and a reproduction unit configured to reproduce the first target noise cancellation signal by a first speaker and reproduce the second target noise cancellation signal by a second speaker to achieve noise reduction. A noise reduction device.

10. A computer-readable storage medium including a stored program, wherein when the program is executed, the storage medium controls a device in which the storage medium exists to execute the noise reduction method according to any one of claims 4 to 8.

11. A processor that executes a program, wherein when the program is executed, the processor executes the noise reduction method according to any one of claims 4 to 8.

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