CN111263252A - Live broadcast wheat-connecting silencing method and system and storage medium - Google Patents
Live broadcast wheat-connecting silencing method and system and storage medium Download PDFInfo
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- CN111263252A CN111263252A CN201811451068.6A CN201811451068A CN111263252A CN 111263252 A CN111263252 A CN 111263252A CN 201811451068 A CN201811451068 A CN 201811451068A CN 111263252 A CN111263252 A CN 111263252A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/439—Processing of audio elementary streams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/478—Supplemental services, e.g. displaying phone caller identification, shopping application
- H04N21/4788—Supplemental services, e.g. displaying phone caller identification, shopping application communicating with other users, e.g. chatting
Abstract
The invention relates to a live broadcast wheat-connected noise reduction method, a live broadcast wheat-connected noise reduction system and a storage medium, and belongs to the technical field of internet. The method comprises the following steps: the live broadcast end receives and samples an audio signal sent by a microphone connecting object to obtain a microphone connecting sampling signal; sampling the local audio signal to obtain a local sampling signal; mixing the wheat connecting sampling signal and the local sampling signal, performing channel dimensionality reduction to obtain a single-channel signal, and sending the single-channel signal to a wheat connecting object; the system comprises a local live broadcast end, a local live broadcast end and a connecting object, wherein the local live broadcast end is used for sampling and receiving a local audio signal and an audio signal sent by the connecting object, mixing the local audio signal and the audio signal, reducing the dimension, and sending the mixed signal to the connecting object; the microphone connecting end is used for sending an audio signal to the local live broadcast end and receiving a single track signal sent by the local live broadcast end; a storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described live telecast muting method for live broadcasting. Compared with the prior art, the invention has the advantages of no echo, good microphone connecting effect and the like.
Description
Technical Field
The invention relates to the technical field of internet, in particular to the field of live broadcast, and specifically relates to a live broadcast wheat-connected noise reduction method, a live broadcast wheat-connected noise reduction system and a storage medium.
Background
The network live broadcast is an application for realizing multimedia audio and video live broadcast through the internet, and is realized by acquiring original audio and video through terminal equipment, carrying out necessary coding and packaging, then transmitting data to a server in real time by a certain predefined protocol, and finishing real-time transmission to audiences by the server. Compared with the traditional analog television or digital television application, the network live broadcast has the advantages of popularization of equipment, low threshold, simplicity in operation and the like. The main broadcast having the live broadcast room on the live broadcast platform can start the live broadcast on the live broadcast platform only through a personal computer or a mobile phone connected to the internet.
Lian Mai was a play from early video chat rooms and was later used in live webcasts. Several large live broadcast platforms provide the function of connecting wheat, so that the anchor can be compared with each other. The communication among the broadcasters can be promoted by connecting the wheat, the broadcasters can be promoted to attract audiences by more live content patterns (meanwhile, the flow is brought to the platform), the audiences can be stimulated to consume for winning the favorite broadcasters, and the method is helpful to the healthy development of the broadcasters and the platform. For live broadcast wheat connecting service, in order to ensure user experience, a user is allowed to participate in wheat connecting by using the same picture and sound as those in normal live broadcast, and can also see and hear the picture and sound of a normal live broadcast of a wheat connecting opponent. The viewer can watch the pictures of two anchor at the same time and hear the sound of two anchor at the same time.
However, the process of realizing the microphone connecting function has the problem that the sound of a microphone of a user and the sound emitted by a system can be captured and mixed for outputting during live broadcasting; this signal is also used when connecting to the microphone. But at the same time, when connecting to the wheat, the anchor needs to hear the sound from the other party. Then, assuming that the anchor A and the anchor B are connected, the anchor A plays the accompaniment and sings at the same time, and the live broadcast client at the anchor B sends out the sound mixed with the accompaniment and the voice at the anchor A; meanwhile, the live client on the side of the anchor B captures the sound of the whole system, so that the sound transmitted from the anchor A played by the live client is recorded and then transmitted back to the anchor A. At this point the a-anchor hears its echo and this echo will continue to be recorded for transmission to the opposite party. With this repetition, there are two results, one is that very serious echo occurs, and the other is that after the signals are continuously superimposed, the power is not converged to a fixed value but is diverged, and exceeds the undistorted amplification limit of the amplifier, and finally becomes a single tone (harsh howling) like a rectangular wave, and this function is not used. Therefore, how to eliminate echoes of two parties connected with the microphone in the live broadcasting process becomes a problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a live broadcast microphone connecting silencing method, a live broadcast microphone connecting silencing system and a live broadcast microphone connecting silencing storage medium which have no echo and good microphone connecting effect.
The purpose of the invention can be realized by the following technical scheme:
a continuous wheat silencing method for live broadcasting comprises the following steps:
(1) the live broadcast end receives and samples an audio signal sent by a microphone connecting object to obtain a microphone connecting sampling signal;
(2) sampling the local audio signal to obtain a local sampling signal;
(3) mixing the continuous microphone sampling signal and the local sampling signal, and performing channel dimensionality reduction to obtain a single-channel signal without the continuous microphone sampling signal;
(4) and sending the single-channel signal to a microphone connecting object.
Preferably, the step (3) specifically comprises the following steps:
(31) performing channel dimensionality reduction on the Lian-Mai sampling signal to obtain a Lian-Mai dimensionality reduction sampling signal;
(32) mixing the Lianmai dimensionality reduction sampling signal and the local sampling signal to obtain a mixed sampling signal;
(33) and further performing dimensionality reduction on the mixed sampling signal to obtain the single-channel signal without the microphone connecting sampling signal.
Preferably, the step (31) is specifically: and multiplying the continuous microphone sampling signal by the first dimensionality reduction matrix to obtain a continuous microphone dimensionality reduction sampling signal.
Preferably, the step (33) is specifically: and multiplying the mixed sampling signal by a second dimensionality reduction matrix to eliminate the connected microphone sampling signal to obtain the single-channel signal.
Preferably, the result of multiplying the first dimension reduction matrix and the second dimension reduction matrix is a zero matrix.
Preferably, the first dimension reduction matrix is specifically:
wherein T is a first dimension reduction matrix.
Preferably, the second dimension reduction matrix is specifically:
wherein T' is a second dimension reduction matrix.
Preferably, the monaural signal is specifically:
S(t)＝a·S1(t)*T'
wherein S (t) is a single-channel signal, a is a sampling coefficient when a local audio signal is sampled, S1And (T) is a local sampling signal, and T' is a second dimensionality reduction matrix.
A live wheat coupled silencing system for live broadcasting, the system comprising:
the local live broadcast terminal is used for sampling and receiving a local audio signal and an audio signal sent by the connected wheat object, mixing and reducing the dimensions of the sampled and received signals, converting the signals into a single-channel signal and sending the single-channel signal to the connected wheat object;
and the microphone connecting end is used for sending the audio signal to the local live broadcast end and receiving the single-channel signal sent by the local live broadcast end.
Preferably, the local live broadcast terminal includes:
the sampling receiving unit is used for receiving and sampling the local audio signal to obtain a local sampling signal, and receiving and sampling the audio signal sent by the microphone connecting object to obtain a microphone connecting sampling signal;
the signal mixing unit is used for mixing the local sampling signal and the dimensionality-reduced Lianmai sampling signal to obtain a mixed sampling signal;
and the sound channel dimensionality reduction unit is used for carrying out sound channel dimensionality reduction on the microphone connecting sampling signal and further carrying out dimensionality reduction on the mixed sampling signal to obtain the single sound channel signal without the microphone connecting sampling signal.
A computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements any of the above-mentioned live-broadcast live-wheat-muting methods.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the continuous wheat silencing method for live broadcasting, the single-channel signal is obtained by performing channel dimensionality reduction, the continuous wheat sampling signal is effectively eliminated from the mixed signal, and the single-channel signal is transmitted back to the continuous wheat object, so that normal audio interaction of both the continuous wheat party and the continuous wheat party in the live broadcasting process is ensured, the sound content of the continuous wheat object is prevented from being transmitted back to the continuous wheat object again, the echo phenomenon of both the continuous wheat party and the continuous wheat party is eliminated, the continuous wheat quality is improved, and the live broadcasting experience of a user is ensured.
(2) In the process of carrying out the vocal tract dimensionality reduction, the specific method is that the continuous microphone sampling signal is multiplied by a first dimensionality reduction matrix and then mixed with the local sampling signal, and the mixed signal is multiplied by a second dimensionality reduction matrix.
Drawings
Fig. 1 is a flow chart of steps of a live broadcast wheat-connected silencing method of the present invention.
Detailed Description
In order to clearly understand the technical contents of the present invention, the following examples are given in detail.
Fig. 1 is a flow chart showing steps of a continuous wheat silencing method for live broadcast according to the present invention.
In one embodiment, the continuous wheat silencing method for live broadcasting comprises the following steps:
(1) the live broadcast end receives and samples an audio signal sent by a microphone connecting object to obtain a microphone connecting sampling signal;
(2) sampling the local audio signal to obtain a local sampling signal;
(3) mixing the continuous microphone sampling signal and the local sampling signal, and performing channel dimensionality reduction to obtain a single-channel signal without the continuous microphone sampling signal, specifically comprising the following steps of:
(31) and performing channel dimensionality reduction on the Lian Mai sampling signal to obtain a Lian Mai dimensionality reduction sampling signal, specifically: multiplying the continuous microphone sampling signal by a first dimensionality reduction matrix to obtain a continuous microphone dimensionality reduction sampling signal;
(32) mixing the Lianmai dimensionality reduction sampling signal and the local sampling signal to obtain a mixed sampling signal;
(33) further dimensionality reduction processing is performed on the mixed sampling signal to obtain the single-sound-channel signal without the microphone connecting sampling signal, and the method specifically comprises the following steps: multiplying the mixed sampling signal by a second dimensionality reduction matrix, eliminating the connected microphone sampling signal, and obtaining the single sound channel signal, wherein the multiplication result of the first dimensionality reduction matrix and the second dimensionality reduction matrix is a zero matrix
The second dimension reduction matrix is specifically
Wherein T is a first dimension reduction matrix, T' is a second dimension reduction matrix, the realization modes of the first dimension reduction matrix and the second dimension reduction matrix are not unique,the foregoing are only one of the preferred embodiments;
(4) and sending the mono signal to the connected wheat object, wherein in the embodiment, the mono signal is specifically:
S(t)＝a·S1(t)*T'
wherein S (t) is a single-channel signal, a is a sampling coefficient when a local audio signal is sampled, S1And (T) is a local sampling signal, and T' is a second dimensionality reduction matrix.
In addition to the above method, the present embodiment further provides a wheat-connected noise reduction system for live broadcasting, which specifically includes: the local live broadcast terminal is used for sampling and receiving a local audio signal and an audio signal sent by the connected wheat object, mixing and reducing the dimensions of the sampled and received signals, converting the signals into a single-channel signal and sending the single-channel signal to the connected wheat object; and the microphone connecting end is used for sending the audio signal to the local live broadcast end and receiving the single-channel signal sent by the local live broadcast end. Wherein, local live end includes: the sampling receiving unit is used for receiving and sampling the local audio signal to obtain a local sampling signal, and receiving and sampling the audio signal sent by the microphone connecting object to obtain a microphone connecting sampling signal; the signal mixing unit is used for mixing the local sampling signal and the dimensionality-reduced Lianmai sampling signal to obtain a mixed sampling signal; and the sound channel dimensionality reduction unit is used for carrying out sound channel dimensionality reduction on the microphone connecting sampling signal and further carrying out dimensionality reduction on the mixed sampling signal to obtain the single sound channel signal without the microphone connecting sampling signal. And a computer-readable storage medium is proposed, on which a computer program is stored, which, when executed by a processor, implements any of the above-mentioned live-feed muting methods for live broadcast.
In practical application, a specific implementation manner of the present invention for live broadcast wheat-connected noise reduction method is illustrated by the following embodiments.
Example 1
With the great improvement of the performance of personal computers and mobile phones and the popularization of broadband internet, the requirement of one-to-one service of real-time audio and video acquisition, coding and transmission can be met in recent years, and live webcast is brought forward. The network live broadcast is an application for realizing multimedia audio and video live broadcast through the internet, and is realized by acquiring original audio and video through terminal equipment, carrying out necessary coding and packaging, then transmitting data to a server in real time by a certain predefined protocol, and finishing real-time transmission to audiences by the server. Compared with the traditional analog television or digital television application, the network live broadcast has the advantages of popularization of equipment, low threshold, simplicity in operation and the like. The main broadcast having the live broadcast room on the live broadcast platform can start the live broadcast on the live broadcast platform only through a personal computer or a mobile phone connected to the internet. The operation mode of network live broadcast is usually that, the platform provides live broadcast server for the anchor, and the anchor provides content for the platform; the platform provides the audience with a way and a way to present to the host for a reward, and a way to collect the cash for the host, where the withdrawal is drawn. In such a model, the attractiveness of the content provided to the viewer is critical to obtaining traffic, and the manner of stimulating consumption is directly linked to the efficiency of the traffic presentation.
Lian Mai was a play from early video chat rooms and was later used in live webcasts. Several large live broadcast platforms provide the function of connecting wheat, so that the anchor can be compared with each other. The communication among the broadcasters can be promoted by connecting the wheat, the broadcasters can be promoted to attract audiences by more live content patterns (meanwhile, the flow is brought to the platform), the audiences can be stimulated to consume for winning the favorite broadcasters, and the method is helpful to the healthy development of the broadcasters and the platform. For live broadcast wheat connecting service, in order to ensure user experience, a user is allowed to participate in wheat connecting by using the same picture and sound as those in normal live broadcast, and can also see and hear the picture and sound of a normal live broadcast of a wheat connecting opponent. The viewer can watch the pictures of two anchor at the same time and hear the sound of two anchor at the same time.
The process of realizing the wheat connecting function has the following problems: in the live broadcasting process, the sound of a microphone of a user and the sound emitted by the system can be captured at the same time and output after mixing; this signal is also used when connecting to the microphone. But at the same time, when connecting to the wheat, the anchor needs to hear the sound from the other party. Then, assuming that the anchor a and the anchor B are connected, the anchor a sings while playing the accompaniment, and a beepli live broadcast client (hereinafter referred to as a live broadcast ji) at the end of the anchor B emits a sound mixed with the accompaniment and the voice at the end of the anchor a; meanwhile, the sound of the whole system is captured by the live broadcasting Ji on the side of the anchor B, and then the sound transmitted from the anchor A played by the live broadcasting Ji is recorded and transmitted back to the anchor A. At this point the a-anchor hears its echo and this echo will continue to be recorded for transmission to the opposite party. With this repetition, there are two results, one is that very serious echo occurs, and the other is that after the signals are continuously superimposed, the power is not converged to a fixed value but is diverged, and exceeds the undistorted amplification limit of the amplifier, and finally becomes a single tone (harsh howling) like a rectangular wave, and this function is not used.
Therefore, in order to solve the above problems, this embodiment provides a continuous-microphone muting method for live broadcasting, in the detailed description of the continuous-microphone muting method in this embodiment, one of the two parties of continuous-microphone is regarded as a local live broadcasting end, the other party is regarded as a continuous-microphone object, and the anchor a and the anchor B of the above parties are taken as examples. After the body is clarified, as shown in fig. 1, the main processes of the method proposed by this embodiment are as follows:
firstly, the sampling of an audio signal sent by a microphone connecting object in a local live broadcast end at t time is defined as a microphone connecting sampling signal, and the specific form is S2(t)＝(L2t,R2t); sampling at t time of all other local audio signals received in the local live broadcast end except the microphone connecting sampling signal is defined as a local sampling signal, and the specific form is S1(t)＝(L1t,R1t). The local live broadcast end defines the function of the mixing of the two as f (x, y) ═ ax + by.
Then, under normal conditions, the sound sampling signal heard by the anchor at the local live end and all users of the anchor during time t should be:
f(S1(t),S2(t))＝a(L1t,R1t)+b(L2t,R2t)
＝(a*L1t+b*L2t,a*R1t+b*R2t)
it can be seen from the above formula that the part of the microphone connecting sampling signal is difficult to be removed by the mixed sound sampling signal under normal conditions, so that the local live broadcasting end can continuously transmit the sound of the microphone connecting object to the microphone connecting object end again in the live broadcasting process, and the microphone connecting object end can also continuously transmit the sound of the local live broadcasting end back to the local live broadcasting end in the same way, thereby greatly reducing the microphone connecting quality in the live broadcasting process.
In order to remove the linmai sampling signal, a first dimensionality reduction matrix is introduced in the embodiment, before the local sampling signal and the linmai sampling signal are mixed at the local live broadcast end, the linmai sampling signal is multiplied by the first dimensionality reduction matrix to obtain the linmai dimensionality reduction sampling signal, and the first dimensionality reduction matrix is defined as
Since this matrix is not full rank, there is a dimensionality reduction loss, i.e., one channel is lost, in the process of multiplying the continuous microphone sampling signal by the first dimensionality reduction matrix.
After the Lianmai dimensionality reduction sampling signal is obtained, the Lianmai dimensionality reduction sampling signal is mixed with the local sampling signal to obtain a mixed sampling signal, and the form of the mixed sampling signal is changed into: f (S)1(t),S2(t)T)＝aS1(t)+bS2(t)T。
After the mixed sampling signal is obtained, further dimension reduction processing is performed, that is, the mixed sampling signal is multiplied by a second dimension reduction matrix, so that the second dimension reduction matrix in this embodiment is
Then, the mono signal obtained by multiplying the mixed sampling signal by the second dimensionality reduction matrix is:
S(t)＝f(S1(t),S2(t)T)*T'＝aS1(t)*T'+bS2(t)*T*T'
since the multiplication of the first dimension-reducing matrix and the second dimension-reducing matrix is a zero matrix, i.e., T × T' ═ 0, and the multiplication of the matrices satisfies the joint law, it can be known that S (T) ═ f (S) after simplification1(t),S2(t)T)*T'＝aS1(t)*T'.
It can be seen from the simplified monaural signal that the continuous microphone sampling signal is removed, the signal is changed into a monaural signal, and at this time, the monaural signal from which the continuous microphone sampling signal is removed is transmitted back to the continuous microphone object, so that no sound signal, i.e., no echo, is emitted by the continuous microphone object in the signal received by the continuous microphone object, and the problem is solved.
Similarly, the microphone connecting object terminal adopts the microphone connecting silencing method which is the same as that of the local live broadcast terminal, so that the signal received by the local live broadcast terminal every time does not contain the sound emitted by the local live broadcast terminal, both live broadcast terminals can normally connect microphones under the condition that no echo exists, and the live broadcast quality is guaranteed.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (11)
1. A continuous wheat silencing method for live broadcasting is characterized by comprising the following steps:
(1) the live broadcast end receives and samples an audio signal sent by a microphone connecting object to obtain a microphone connecting sampling signal;
(2) sampling the local audio signal to obtain a local sampling signal;
(3) mixing the continuous microphone sampling signal and the local sampling signal, and performing channel dimensionality reduction to obtain a single-channel signal without the continuous microphone sampling signal;
(4) and sending the single-channel signal to a microphone connecting object.
2. The continuous wheat silencing method for the live broadcast according to claim 1, wherein the step (3) specifically comprises the following steps:
(31) performing channel dimensionality reduction on the Lian-Mai sampling signal to obtain a Lian-Mai dimensionality reduction sampling signal;
(32) mixing the Lianmai dimensionality reduction sampling signal and the local sampling signal to obtain a mixed sampling signal;
(33) and further performing dimensionality reduction on the mixed sampling signal to obtain the single-channel signal without the microphone connecting sampling signal.
3. The continuous wheat noise reduction method for live broadcasting according to claim 2, wherein the step (31) is specifically: and multiplying the continuous microphone sampling signal by the first dimensionality reduction matrix to obtain a continuous microphone dimensionality reduction sampling signal.
4. The continuous wheat noise reduction method for live broadcasting according to claim 3, wherein the step (33) is specifically: and multiplying the mixed sampling signal by a second dimensionality reduction matrix to eliminate the connected microphone sampling signal to obtain the single-channel signal.
5. The continuous wheat noise reduction method for the live broadcast of claim 4, wherein a result of multiplying the first dimension reduction matrix by the second dimension reduction matrix is a zero matrix.
6. The continuous wheat noise reduction method for live broadcasting according to claim 4, wherein the first dimensionality reduction matrix is specifically:
wherein T is a first dimension reduction matrix.
7. The continuous wheat noise reduction method for live broadcasting according to claim 6, wherein the second dimensionality reduction matrix is specifically:
wherein T' is a second dimension reduction matrix.
8. The live broadcast wheat-connected noise reduction method according to claim 4, wherein the mono signal is specifically:
S(t)＝a·S1(t)*T'
wherein S (t) is a single-channel signal, a is a sampling coefficient when a local audio signal is sampled, S1And (T) is a local sampling signal, and T' is a second dimensionality reduction matrix.
9. A wheat-connected sound reduction system for live broadcast, the system comprising:
the local live broadcast terminal is used for sampling and receiving a local audio signal and an audio signal sent by the connected wheat object, mixing and reducing the dimensions of the sampled and received signals, converting the signals into a single-channel signal and sending the single-channel signal to the connected wheat object;
and the microphone connecting end is used for sending the audio signal to the local live broadcast end and receiving the single-channel signal sent by the local live broadcast end.
10. The continuous wheat silencing system for live broadcasting of claim 8, wherein the local live broadcasting end comprises:
the sampling receiving unit is used for receiving and sampling the local audio signal to obtain a local sampling signal, and receiving and sampling the audio signal sent by the microphone connecting object to obtain a microphone connecting sampling signal;
the signal mixing unit is used for mixing the local sampling signal and the dimensionality-reduced Lianmai sampling signal to obtain a mixed sampling signal;
and the sound channel dimensionality reduction unit is used for carrying out sound channel dimensionality reduction on the microphone connecting sampling signal and further carrying out dimensionality reduction on the mixed sampling signal to obtain the single sound channel signal without the microphone connecting sampling signal.
11. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a live-talk muting method for live broadcasting according to any one of claims 1 to 8.
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