Audio parametric array speaker system and modulation method thereof

Abstract

The invention provides an audio parametric array speaker system and a modulation method thereof. A pulse density modulation module is added in the system, and a signal having a follow-up processing function can be obtained. The method comprises the following steps of: performing carrier wave modulation, pulse density modulation, demultiplexing, direction adjustment and multi-direction signal superposition on digital audio signals, and transmitting ultrasound through an energy amplification and ultrasonic transduction array. Therefore, an outputted audio signal has functions of timely adjusting a direction and simultaneously playing sound in a plurality of strong directional directions. In addition, a digital signal system has the advantages of anti-interference, high integration and chip design.

Description

【Technical field】 [0001] The invention relates to a loudspeaker system, in particular to an acoustic parametric array loudspeaker system and a modulation method for carrying out carrier modulation in a digital manner. 【Background technique】 [0002] With the rapid development of acoustic technology, high-quality loudspeaker systems have been widely used in various fields and occasions, and the acoustic parametric array loudspeaker with directivity is widely welcomed by people because of its high directivity and ultrasonic transmission. The ultra-thin loudspeaker structure with long-distance transmission, no sound box and magnet coil has opened up a new application field, and its application occasions include: conference halls, exhibition halls, museums and confidential communication and other occasions. People not only require it to have the function of directional sound transmission, but also require the acoustic parametric array speaker to have the characteristics of multi...

AI Technical Summary

Problems solved by technology

[0004] Because the acoustic parametric array loudspeaker digital system of the related technology outputs the pulse width modulation signal after the signal is modulated by the carrier, and the pulse width modulation signal does not have the function of subsequent signal processing, it is difficult to realize the function of controllable direction, and it can only be emitted to front-emitting ultrasound

However, many businesses use mechanical devices to realize the controllability of the sound direction, which not only increases the volume and complexity of the system, but also is inconvenient to use and maintain.

At the same time, the use of mechanical devices to achieve the controllability of the direction requires a certain start time and stop time, and the direction accuracy is limited, and the sound propagation direction cannot be continuously changed. Usually, the speaker has only one directivity direction.

It does not meet the needs of customers for speakers with multi-directional sound transmission functions

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