Signal processing device

Abstract

The invention provides a signal processing device which is used for receiving a noise signal and generating a noise elimination signal. The signal processing device comprises an inverting circuit and a selection circuit, wherein the inverting circuit is used for inverting a first signal to generate a first inverting signal; and the selection circuit is coupled with the inverting circuit and used for selecting one of the first signal and the first inverting signal as an output signal.

Description

technical field

[0001] The present invention relates to signal processing, in particular to a signal processing device for active noise control. Background technique

[0002] The main concept of active noise control (ANC) is to generate an anti-noise that is roughly anti-phase according to a noise source in the environment (actually, it may only contain the low-frequency part of the noise source), and its amplitude It is roughly the same as the noise source, but the phase is opposite, and the superposition characteristics of sound waves are used to make the anti-noise and the noise source produce destructive interference with each other to suppress the noise. This technology is usually widely used in loudspeaker devices such as earphones. When the user listens to a sound source played by the loudspeaker device, the loudspeaker device is used to play anti-noise simultaneously (by combining a message signal corresponding to the sound source with The noise-cancelled signal cor...

Examples

Embodiment Construction

[0036] The concept of the present invention will be described below in conjunction with different embodiments and related figures, and the different technical features mentioned in different embodiments herein are not limited to implementation in this embodiment. In fact, within the reasonable scope of the present invention, a certain embodiment can be properly modified so that it has the specific technical features of other embodiments.

[0037] The signal processing device of the present invention includes an inverter circuit, a filter circuit, a selection circuit and other components, and is used to receive a noise signal and generate a noise elimination signal. The function of the filter circuit is mainly used to generate a noise canceling signal similar to a noise in the environment (but substantially inverted), and the inverting circuit is mainly used to generate another set of signals with a different polarity, and Whether to output the inverted or non-inverted noise ca...

technical field

[0001] The present invention relates to signal processing, in particular to a signal processing device for active noise control. Background technique

[0002] The main concept of active noise control (ANC) is to generate an anti-noise that is roughly anti-phase according to a noise source in the environment (actually, it may only contain the low-frequency part of the noise source), and its amplitude It is roughly the same as the noise source, but the phase is opposite, and the superposition characteristics of sound waves are used to make the anti-noise and the noise source produce destructive interference with each other to suppress the noise. This technology is usually widely used in loudspeaker devices such as earphones. When the user listens to a sound source played by the loudspeaker device, the loudspeaker device is used to play anti-noise simultaneously (by combining a message signal corresponding to the sound source with The noise-cancelled signal cor...

Examples

Embodiment Construction

[0036] The concept of the present invention will be described below in conjunction with different embodiments and related figures, and the different technical features mentioned in different embodiments herein are not limited to implementation in this embodiment. In fact, within the reasonable scope of the present invention, a certain embodiment can be properly modified so that it has the specific technical features of other embodiments.

[0037] The signal processing device of the present invention includes an inverter circuit, a filter circuit, a selection circuit and other components, and is used to receive a noise signal and generate a noise elimination signal. The function of the filter circuit is mainly used to generate a noise canceling signal similar to a noise in the environment (but substantially inverted), and the inverting circuit is mainly used to generate another set of signals with a different polarity, and Whether to output the inverted or non-inverted noise ca...

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