CN112151057A

CN112151057A - Echo cancellation method and system

Info

Publication number: CN112151057A
Application number: CN202011215837.XA
Authority: CN
Inventors: 欧阳烨
Original assignee: AI Speech Ltd
Current assignee: AI Speech Ltd
Priority date: 2020-11-04
Filing date: 2020-11-04
Publication date: 2020-12-29

Abstract

The embodiment of the invention provides an echo cancellation method. The method comprises the following steps: the first electronic equipment establishes connection with the second electronic equipment by using the Bluetooth communication module; sending the sound source to an audio decoding circuit of the second electronic equipment for playing through a first Bluetooth channel of the Bluetooth communication module; and sending the sound source to an echo acquisition loop of the second electronic equipment through a second Bluetooth channel of the Bluetooth communication module to perform echo cancellation. The embodiment of the invention also provides an echo cancellation system. The embodiment of the invention comprises the following steps: redesigned the structure of the first electronic equipment who is connected with second electronic equipment, made it possess two bluetooth passageways, guaranteed when the transmission audio frequency, still send the echo collection return circuit that second electronic equipment corresponds with the sound source of gathering in, ensure that it possess solitary echo collection return circuit to the echo cancellation problem of supporting use between a plurality of equipment has been solved.

Description

Echo cancellation method and system

Technical Field

The invention relates to the field of intelligent voice, in particular to an echo cancellation method and system.

Background

At present, most vehicles are equipped with voice assistants, wherein when the voice assistants are used for voice recognition in the vehicles, echo cancellation is needed, and the problems of false triggering and self-question and self-answer caused by the fact that the vehicle machine recognizes the voice of the vehicle machine are avoided. In the current common technology, two loops are set in a vehicle machine, one loop collects external sound, and the other loop transmits a self sound source to an algorithm module for echo cancellation (generates sound waves with the same waveform for cancellation).

In the process of implementing the invention, the inventor finds that at least the following problems exist in the related art:

when other vehicle-mounted devices such as a vehicle-mounted box are connected with a vehicle machine through Bluetooth and the vehicle machine is used for playing, the vehicle machine cannot accurately collect self sound sources because the sound sources are from the outside of the vehicle, an independent loop is needed in the echo cancellation technology, and the audio of the sound sources is transmitted to an algorithm module to be matched and offset with the same waveform, so that the echo cancellation effect is poor.

Disclosure of Invention

In order to solve other electronic equipment among the prior art at least and connect the vehicle when broadcasting, because the sound source is from the outside, the car machine can't accurately gather self sound source for echo cancellation lacks corresponding return circuit, leads to the problem that echo cancellation effect is not good.

In a first aspect, an embodiment of the present invention provides an echo cancellation method, including:

the first electronic equipment establishes connection with the second electronic equipment by using the Bluetooth communication module;

sending a sound source to an audio decoding circuit of the second electronic device through a first Bluetooth channel of the Bluetooth communication module for playing;

and sending the sound source to an echo acquisition loop of the second electronic equipment for echo cancellation through a second Bluetooth channel of the Bluetooth communication module.

In a second aspect, an embodiment of the present invention provides an electronic device, which includes: at least one processor, and a memory and a bluetooth communication module communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to:

establishing connection with external electronic equipment by utilizing the Bluetooth communication module;

sending a sound source to an audio decoding circuit of the external electronic equipment for playing through a first Bluetooth channel of the Bluetooth communication module;

and sending the sound source to an echo acquisition loop of the external electronic equipment through a second Bluetooth channel of the Bluetooth communication module to perform echo cancellation.

In a third aspect, an embodiment of the present invention provides a bluetooth playing system, including a first electronic device and a second electronic device, where the first electronic device and the second electronic device can perform bluetooth communication with each other, and a bluetooth communication module of the first electronic device has a first bluetooth channel and a second bluetooth channel;

the first Bluetooth channel is used for sending a sound source of the first electronic equipment to an audio decoding circuit of the second electronic equipment for playing;

and the second Bluetooth channel is used for sending the sound source to an echo acquisition loop of the second electronic equipment for echo cancellation.

In a fourth aspect, an embodiment of the present invention provides a storage medium, on which a computer program is stored, where the computer program is configured to, when executed by a processor, implement the steps of the echo cancellation method according to any embodiment of the present invention.

The embodiment of the invention has the beneficial effects that: redesigned the structure of the first electronic equipment who is connected with second electronic equipment, made it possess two bluetooth passageways, guaranteed when the transmission audio frequency, still send the echo collection return circuit that second electronic equipment corresponds with the sound source of gathering in, ensure that it possess solitary echo collection return circuit to the echo cancellation problem of supporting use between a plurality of equipment has been solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 is a flowchart of an echo cancellation method according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a bluetooth playing system according to an embodiment of the present invention;

fig. 4 is a detailed flowchart of an echo cancellation method according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a flowchart of an echo cancellation method according to an embodiment of the present invention, which includes the following steps:

s11: the first electronic equipment establishes connection with the second electronic equipment by using the Bluetooth communication module;

s12: sending a sound source to an audio decoding circuit of the second electronic device through a first Bluetooth channel of the Bluetooth communication module for playing;

s13: and sending the sound source to an echo acquisition loop of the second electronic equipment for echo cancellation through a second Bluetooth channel of the Bluetooth communication module.

In this embodiment, the structure of the first electronic device (e.g., an in-vehicle box or an intelligent box for an intelligent television) is redesigned to have two bluetooth chips built therein, so that two bluetooth channels are provided in the bluetooth communication module.

For step S11, the second electronic device may be a smart car, and when the second electronic device is enabled, the smart car starts a bluetooth broadcast, and the first electronic device (for example, a car-mounted box, which is described below as an example) performs a bluetooth connection to the smart car.

Similarly, the Bluetooth broadcast can also be opened to on-vehicle box, waits for the smart car machine to connect to it. Both end devices may be bluetooth connected to each other. The user can conveniently connect and operate the device when in use.

Because two Bluetooth chips (not limited to two Bluetooth chips in specific implementation, along with technical innovation, the two Bluetooth chips can be integrated into one Bluetooth chip, so that two Bluetooth channels can be arranged in one Bluetooth chip, if echo cancellation needs more loops, the Bluetooth channels can be added), when the two Bluetooth chips are connected in advance, the two Bluetooth channels can be connected in advance, when the vehicle-mounted box is connected with the Bluetooth of the intelligent vehicle, although only one Bluetooth device is displayed in a connection interface, after the two Bluetooth chips are connected, the two Bluetooth chips can be respectively connected into the intelligent vehicle.

For step S12, the first bluetooth channel in the bluetooth communication module is used as a traditional transmission channel for playing audio, and the audio is transmitted to the audio decoding circuit (or audio power amplifier module) of the smart car for normal playing.

For step S13, since the vehicle-mounted box also has a microphone, the audio played by the smart car can be collected. And the collected audio is butted to the original echo collection loop of the intelligent vehicle machine through a second Bluetooth channel. Therefore, although the sound source comes from the outside of the intelligent vehicle, the vehicle-mounted box connected with the intelligent vehicle is redesigned, an independent echo acquisition loop is needed for providing an echo cancellation technology for the intelligent vehicle, and echo cancellation can be carried out.

As an embodiment, the first electronic device includes: an intelligent box;

the second electronic device includes: intelligent car machine, intelligent TV.

In this embodiment, there are more and more smart speakers (or smart boxes, etc.) on the market, and the smart speakers and other devices are often connected for use. When two intelligent hardware are interconnected for use, how to remove echo and maintain the effect of voice recognition is a common problem.

The method can be used in a vehicle-mounted scene and a home scene. For example, the television is connected to the smart speaker through bluetooth for playing, and at this time, the smart speaker can also perform echo cancellation by using the method, and the specific steps are the same as those described above and are not described herein again.

According to the embodiment, the structure of the first electronic equipment connected with the second electronic equipment is redesigned, so that the first electronic equipment has two Bluetooth channels, the collected sound source is sent to the echo collection loop corresponding to the second electronic equipment while audio is transmitted, and the single echo collection loop is ensured to be possessed, so that the problem of echo cancellation matched with multiple devices in use is solved.

Fig. 2 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 2, the electronic device includes: at least one processor 210, and a memory 211 and a bluetooth communication module 212 communicatively coupled to the at least one processor 210, wherein the memory 211 stores instructions executable by the at least one processor 210, the instructions being executable by the at least one processor 210 to enable the at least one processor 210 to:

As one embodiment, the electronic device is a smart box.

Fig. 3 is a bluetooth playing system according to an embodiment of the present invention, which includes a first electronic device and a second electronic device, where the first electronic device and the second electronic device can communicate with each other via bluetooth, and a bluetooth communication module of the first electronic device has a first bluetooth channel and a second bluetooth channel;

In this embodiment, the bluetooth playing system is used by two electronic devices in cooperation. For example, the vehicle-mounted box is matched with a smart car machine, and the smart box is matched with a smart television. And the user plays the music in the vehicle-mounted box through the intelligent vehicle machine, or plays the audio/video in the intelligent box through the intelligent television. In the following, the audio/video in the smart box is mainly played through the smart television for example.

Because intelligence box and intelligent TV all have the bluetooth function, can bluetooth communication each other, and the bluetooth communication module in the intelligence box has first bluetooth passageway and second bluetooth passageway. The first Bluetooth channel is used for sending the sound source of the intelligent box to an audio decoding circuit of the intelligent television for playing; and the second Bluetooth channel is used for sending the sound source to an echo acquisition loop of the second electronic equipment for echo cancellation.

As an embodiment, the echo collection circuit is configured to receive a mixed sound of the human voice collected by the microphone of the second electronic device and the sound source playing sound, and perform echo cancellation on the mixed sound by using the sound source from the second bluetooth channel to obtain a pure human voice. The echo acquisition loop is also used for sending the pure voice to a voice recognition module for voice recognition.

When the user used the speech recognition function, the echo collection return circuit in the smart television received the people's voice that its microphone was gathered with the audio mixing of sound source broadcast sound, at this moment utilized the sound source of second bluetooth passageway right the audio mixing carries out echo cancellation, has obtained pure people's voice. And carrying out voice recognition on the pure voice through a voice recognition module in the intelligent television so as to output a recognition result. The problem of echo cancellation when a user uses two electronic devices in a matched manner is solved, and therefore the identification accuracy is improved.

In combination with a specific figure 4 taking a vehicle-mounted Bluetooth device as an example, the use scene is that the vehicle-mounted intelligent device is connected to a sound box of a vehicle machine through Bluetooth to perform music power amplification, and the vehicle machine has a voice recognition control function.

The method comprises the following steps:

a. the Bluetooth A in the Bluetooth communication module of the vehicle-mounted Bluetooth equipment is connected with the vehicle-mounted Bluetooth to transmit music to be played;

b. the Bluetooth B in the Bluetooth communication module of the vehicle-mounted Bluetooth equipment is connected with the Bluetooth of the vehicle-mounted machine, and transmits audio required by echo elimination in an echo acquisition loop of the vehicle-mounted machine;

c. the user uses the voice recognition function at the moment, and the microphone of the car machine receives the mixed voice of the human speaking voice and the music power amplifier;

d. the echo cancellation module of the car machine cancels the sound of the music power amplifier through the audio frequency transmitted by the Bluetooth B, and then obtains pure voice;

e. the car machine sends the pure voice to the voice recognition module and outputs the recognition result.

The embodiment of the invention also provides a nonvolatile computer storage medium, wherein the computer storage medium stores computer executable instructions which can execute the echo cancellation method in any method embodiment;

as one embodiment, a non-volatile computer storage medium of the present invention stores computer-executable instructions configured to:

As a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as program instructions/modules corresponding to the methods in embodiments of the present invention. One or more program instructions are stored in a non-transitory computer readable storage medium, which when executed by a processor, perform the echo cancellation method of any of the method embodiments described above.

The non-volatile computer-readable storage medium may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the device, and the like. Further, the non-volatile computer-readable storage medium may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the non-transitory computer readable storage medium optionally includes memory located remotely from the processor, which may be connected to the device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

An embodiment of the present invention further provides an electronic device, which includes: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of the echo cancellation method of any of the embodiments of the present invention.

The client of the embodiment of the present application exists in various forms, including but not limited to:

(1) mobile communication devices, which are characterized by mobile communication capabilities and are primarily targeted at providing voice and data communications. Such terminals include smart phones, multimedia phones, functional phones, and low-end phones, among others.

(2) The ultra-mobile personal computer equipment belongs to the category of personal computers, has calculation and processing functions and generally has the characteristic of mobile internet access. Such terminals include PDA, MID, and UMPC devices, such as tablet computers.

(3) Portable entertainment devices such devices may display and play multimedia content. The devices comprise audio and video players, handheld game consoles, electronic books, intelligent toys and portable vehicle-mounted navigation devices.

(4) Other electronic devices with data processing capabilities.

In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. An echo cancellation method, comprising:

2. The method of claim 1, wherein the first electronic device comprises: an intelligent box;

the second electronic device includes: intelligent car machine, intelligent TV.

3. An electronic device, comprising: at least one processor, and a memory and a bluetooth communication module communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to:

4. The electronic device of claim 3, wherein the electronic device is a smart box.

5. A Bluetooth playing system comprises a first electronic device and a second electronic device, wherein the first electronic device and the second electronic device can be in Bluetooth communication with each other, and a Bluetooth communication module of the first electronic device is provided with a first Bluetooth channel and a second Bluetooth channel;

6. The system of claim 5, wherein the echo collection circuit is configured to accept a mix of the human voice collected by the microphone of the second electronic device and the audio source played sound, and perform echo cancellation on the mix using the audio source from the second bluetooth channel to obtain a clean human voice.

7. The system of claim 6, wherein the echo acquisition loop is further configured to send the clean human voice to a voice recognition module for voice recognition.

8. The system of claim 5, wherein the first electronic device comprises: an intelligent box;

the second electronic device includes: intelligent car machine, intelligent TV.