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Audio parametric array speaker system and modulation method thereof

A loudspeaker and acoustic parameter technology, which is applied in the field of loudspeaker systems, can solve problems such as limited direction accuracy, difficulty in realizing direction control, and pulse width modulation signal without the function of subsequent signal processing, etc.

Inactive Publication Date: 2012-05-02
AAC TECH PTE LTD +2
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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

Method used

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  • Audio parametric array speaker system and modulation method thereof
  • Audio parametric array speaker system and modulation method thereof
  • Audio parametric array speaker system and modulation method thereof

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0043] Such as figure 1As shown, an acoustic parametric array speaker system 10, wherein the acoustic parametric array speaker system 10 includes a carrier modulation processing device for receiving a digital audio signal and sequentially processing the digital audio signal to output multiple pulse signals with different directions 11. A power amplifier 12 that receives the direction-adjusted multiple pulse signals output by the carrier modulation processing module and amplifies the power of each pulse signal to convert it into each ultrasonic signal, and receives each pulse signal output from the power amplifier module. Ultrasonic signals of various channels are converted into ultrasonic waves and output to the external ultrasonic transducer array 13 . Among them, the carrier modulation processing device includes a carrier amplitude modulation unit 11...

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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...

Claims

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Application Information

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IPC IPC(8): H04R1/32
Inventor 冯声振张丽宏
Owner AAC TECH PTE LTD
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