CN102163431A - Method for improving audio quality of HDTV (high-definition television) by applying forward noise compensation - Google Patents
Method for improving audio quality of HDTV (high-definition television) by applying forward noise compensation Download PDFInfo
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- CN102163431A CN102163431A CN201110069826XA CN201110069826A CN102163431A CN 102163431 A CN102163431 A CN 102163431A CN 201110069826X A CN201110069826X A CN 201110069826XA CN 201110069826 A CN201110069826 A CN 201110069826A CN 102163431 A CN102163431 A CN 102163431A
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Abstract
The invention relates to the technical field of digital television audio processing, and in particular relates to a method for improving the audio quality of an HDTV (high-definition television) by applying forward noise compensation. The method is characterized in that: a forward noise compensation module is added at the front end of an audio output device, an audio signal separated from an HDMI (high-definition multimedia interface) is input into the forward noise compensation module, the forward noise compensation module acquires the current environmental noise by virtue of a noise sensor, an estimated man-made noise is added into the audio signal so as to offset the environmental noise when the audio signal is output, and the audio signal interfered by the man-made noise is transmitted to the audio output device. By applying the method, the environmental noise when the audio signal is output can be reduced or eliminated, and the quality of the audio signal can be improved.
Description
Technical Field
The invention relates to the technical field of digital television audio processing, in particular to a method for improving the audio quality of HDTV by applying forward noise compensation.
Background
With the comprehensive popularization of digital life, the development of digital televisions makes great progress, and users also put forward higher requirements on the audio and video quality of the existing digital televisions. Generally, for the audio part processing of the digital television, the separated audio signal is directly input into the audio output device for output, and the subsequent processing of the audio is relatively little. In the process of directly outputting the audio of the digital television, the influence of environmental noise is not considered, for a television user, a really received signal is a signal of a voice signal subjected to noise interference, the audio-visual effect is often influenced, particularly for the existing high-definition digital television, the video effect is greatly improved, and the requirement of high definition on the audio is particularly important. For such audio signals after being interfered by the environmental noise, if no compensation operation is performed, noise filtering needs to be performed on the receiving end of the end user in order to ensure the original information of the audio, which has a limited application range in practical operation.
Disclosure of Invention
The present invention is directed to overcoming the deficiencies of the prior art and providing a method for improving the audio quality of HDTV by applying forward noise compensation, which is advantageous for reducing or eliminating the environmental noise when outputting the audio signal and improving the audio signal quality.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for improving HDTV audio quality by applying forward noise compensation is characterized in that: the front end of the audio output equipment is additionally provided with a forward noise compensation module, the audio signals separated out from the HDMI are input into the forward noise compensation module, the forward noise compensation module acquires current environmental noise through a noise sensor, estimated environmental noise is reversely added into the audio signals, and then the audio signals added with the estimated environmental noise are transmitted to the audio output equipment.
The forward noise compensation module estimates and adds the artificial noise in real time through a self-adaptive algorithm with variable step length according to the change of the monitored environmental noise.
The invention is characterized in that the processing mode of the previous audio signal is changed, and the forward noise compensation is adopted to artificially add the estimated environmental noise before the audio signal is output, so that the real environmental noise is offset or reduced in the output of the processed audio signal, a user receives 'pure' audio information, and the output quality of the digital television audio signal is improved. In addition, the invention adopts the adaptive algorithm with variable step length to estimate and add the noise in real time according to the change of the environmental noise, has high sensitivity and good real-time performance, and can effectively and timely perform the noise adaptive compensation.
The invention is described in further detail below with reference to the figures and the embodiments.
Drawings
FIG. 1 is a schematic diagram of an implementation of an embodiment of the invention.
FIG. 2 is a schematic diagram of a step-size-varying LMS algorithm according to an embodiment of the present invention.
Detailed Description
The invention relates to a method for improving HDTV audio quality by applying forward noise compensation, which is characterized in that a forward noise compensation module is added at the front end of audio output equipment, an audio signal separated from HDMI is input into the forward noise compensation module, the forward noise compensation module acquires current environmental noise through a noise sensor, estimated environmental noise is reversely added into the audio signal, and then the audio signal added with the estimated environmental noise is transmitted to the audio output equipment.
The forward noise compensation module estimates and adds the artificial noise in real time through a self-adaptive algorithm with variable step length according to the change of the monitored environmental noise.
In this embodiment, the adaptive algorithm with a variable step size is implemented by using a variable step size LMS algorithm, and mainly aims to improve the convergence rate of the system and reduce the offset error under the condition of high sensitivity. The expression is as follows:
wherein,e(n) Representing the audio processing error signal, is presented,d(n) Which is indicative of the desired output signal,X(n) To representnThe time of day is the input audio signal vector,W(n) To representnThe time-of-day adaptive filter weights,which represents a step-size factor, is,
、
is an actual definition parameter; the variable step LMS algorithm adjusts the step factor in real time according to the change of the environmental noise
To add real-time artificial noise to the audio signal.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (3)
1. A method for improving HDTV audio quality by applying forward noise compensation is characterized in that: the front end of the audio output equipment is additionally provided with a forward noise compensation module, the audio signals separated out from the HDMI are input into the forward noise compensation module, the forward noise compensation module acquires current environmental noise through a noise sensor, estimated environmental noise is reversely added into the audio signals, and then the audio signals added with the estimated environmental noise are transmitted to the audio output equipment.
2. The method of claim 1, wherein the applying forward noise compensation improves HDTV audio quality comprises: and the forward noise compensation module estimates and adds the artificial noise in real time through a self-adaptive algorithm with variable step length according to the change of the monitored environmental noise.
3. The method of claim 1, wherein the applying forward noise compensation improves HDTV audio quality comprises: the step-variable adaptive algorithm adopts a step-variable LMS algorithm, and the expression is as follows:
wherein,e(n) Representing the audio processing error signal, is presented,d(n) Which is indicative of the desired output signal,X(n) To representnThe time of day is the input audio signal vector,W(n) To representnThe time-of-day adaptive filter weights,which represents a step-size factor, is,
、
is an actual definition parameter; the variable step LMS algorithm adjusts the step factor in real time according to the change of the environmental noise
To add real-time artificial noise to the audio signal.
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| CN201110069826XA CN102163431A (en) | 2011-03-23 | 2011-03-23 | Method for improving audio quality of HDTV (high-definition television) by applying forward noise compensation |
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| CN201110069826XA CN102163431A (en) | 2011-03-23 | 2011-03-23 | Method for improving audio quality of HDTV (high-definition television) by applying forward noise compensation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113329197A (en) * | 2021-05-13 | 2021-08-31 | 纳路易爱姆斯株式会社 | Solid immersion type OLED audio system |
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| CN101001481A (en) * | 2006-01-14 | 2007-07-18 | 三星电子株式会社 | Apparatus and method of reducing noise of earphones, noise reducing earphones, and a portable audio reproducing apparatus |
| CN101237252A (en) * | 2007-11-20 | 2008-08-06 | 西安电子科技大学 | A Method of Improving Correlation Performance Based on Adaptive Canceller |
| CN101320996A (en) * | 2008-05-27 | 2008-12-10 | 中山大学 | A device and method for adaptive noise cancellation |
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Patent Citations (5)
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| WO2003103170A2 (en) * | 2002-05-31 | 2003-12-11 | Matsushita Electric Industrial Co., Ltd. | Bandwidth adaptation rule for adaptive noise filter for inverse filtering with improved disturbance rejection bandwidth and speed |
| CN1737905A (en) * | 2004-08-18 | 2006-02-22 | 华为技术有限公司 | Device and method for eliminating voice communication terminal background noise |
| CN101001481A (en) * | 2006-01-14 | 2007-07-18 | 三星电子株式会社 | Apparatus and method of reducing noise of earphones, noise reducing earphones, and a portable audio reproducing apparatus |
| CN101237252A (en) * | 2007-11-20 | 2008-08-06 | 西安电子科技大学 | A Method of Improving Correlation Performance Based on Adaptive Canceller |
| CN101320996A (en) * | 2008-05-27 | 2008-12-10 | 中山大学 | A device and method for adaptive noise cancellation |
Non-Patent Citations (1)
| Title |
|---|
| RAYMOND H. KWONG,ET AL.: "A Variable Step Size LMS Algorithm", 《IEEE TRANSACTIONS ON SIGNAL PROCESSING》, vol. 40, no. 7, 31 July 1992 (1992-07-31), pages 1633 - 1642 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113329197A (en) * | 2021-05-13 | 2021-08-31 | 纳路易爱姆斯株式会社 | Solid immersion type OLED audio system |
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Application publication date: 20110824 |