Method for reducing noises of directional loudspeaker, and directional loudspeaker capable of reducing noises

A directional speaker, noise technology, applied in the field of signal processing, can solve the problems of affecting sound quality, high-frequency noise, harshness, etc.

Pending Publication Date: 2019-04-16
CINREAD TECH SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the ultrasonic wave enters the human ear, it will produce audible secondary harmonics. For example, the 40KHz ultrasonic wave will produce

Method used

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  • Method for reducing noises of directional loudspeaker, and directional loudspeaker capable of reducing noises
  • Method for reducing noises of directional loudspeaker, and directional loudspeaker capable of reducing noises
  • Method for reducing noises of directional loudspeaker, and directional loudspeaker capable of reducing noises

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Embodiment Construction

[0020] In this embodiment, a directional loudspeaker for reducing noise is taken as an example, and the present invention will be described in detail below with reference to specific embodiments and drawings.

[0021] see figure 1 and figure 2 , shows a noise-reducing directional speaker 100 provided by an embodiment of the present invention, including a signal amplifier 10, a signal modulator group 20, a power amplifier group 30 and an ultrasonic transducer 40, and the signal modulator group 20 includes at least two a signal modulator, the power amplifier group 30 includes at least two power amplifiers, the ultrasonic transducer 40 includes at least two ultrasonic transducer head groups, and the two ultrasonic transducer head groups are connected to the two ultrasonic transducer heads respectively The power amplifiers, the two power amplifiers are respectively connected to the two signal modulators, the two signal modulators are connected to the signal amplifiers, and the t...

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Abstract

The invention discloses a method for reducing noises of a directional loudspeaker, and the directional loudspeaker capable of reducing the noises. The directional loudspeaker comprises a signal modulator, a signal modulator set, a power amplifier set and an ultrasonic transducer; signal modulators adopt high-frequency modulation signals with different frequencies, so that the output power of the power amplifier set is reduced; and each ultrasonic transducer head set converts modulated electric signals into ultrasonic signals and emits the ultrasonic signals. Sound signals output by each ultrasonic transducer head set are superposed mutually; the power of a superposed sound signal is consistent with the output power when only one high-frequency modulation signal is adopted; and the loudnessof a sound is not changed. Secondary harmonic components generated by the ultrasonic signals output by each ultrasonic transducer head set are superposed mutually; and the frequency number of a superposed secondary harmonic component is increased, but the amplitude of each secondary harmonic component is reduced along with the increase of the frequency number of the modulation signals, so that the interference of secondary harmonic noises to human ears is reduced, and the purpose of reducing the noises is achieved.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a method for reducing noise of a directional loudspeaker and a directional loudspeaker for reducing noise. Background technique [0002] Directional loudspeakers can be used for voice prompts such as advertisements, exhibitions, and guides for the blind, and can also be used for directional guidance in public places such as waiting halls, so as to realize directional broadcast of sound for the desired crowd. High-power directional speakers can also be used in foggy waterways Command, air traffic security command and other fields. Directional loudspeakers use the nonlinear interaction of ultrasonic waves propagating in the air to produce highly directional self-demodulating audible sounds, thereby achieving directional propagation of sound frequencies. The principle of the directional speaker is to use the directionality of the ultrasonic wave to modulate the audible so...

Claims

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Application Information

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IPC IPC(8): H04R3/00H04R1/32
CPCH04R3/00H04R1/323H04R2430/00
Inventor 赵学斌冼子恩欧阳永钜
Owner CINREAD TECH SHENZHEN CO LTD
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