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Parametric array audio play system

An audio playback and parametric array technology, applied in the direction of amplifier combination, improved amplifier to reduce nonlinear distortion, etc., can solve the problems of high performance requirements of ultrasonic transducers, complex system structure, etc., and achieve reduced performance requirements, simplified design, and structural simplified effect

Inactive Publication Date: 2011-03-09
AAC TECH PTE LTD +1
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AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the existing parametric array audio playback system has complex system structure and high performance requirements for ultrasonic transducers, the present invention provides a system with simple structure and high A parametric array audio playback system with low transducer performance requirements

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Embodiment Construction

[0015] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] The parametric array audio playback system of the present invention is mainly used to play audible sounds formed by a combination of preset multiple frequencies, and the frequency combination includes one or more preset different frequencies. The parametric array audio playback system includes a receiving device, a high-frequency pulse signal generator, a multi-channel digital power amplifier and an ultrasonic transducer array. Wherein, the receiving device is used for receiving a control signal of the amplitude of each frequency in the frequency combination. The high-frequency pulse signal generator is used to generate a high-frequency pulse signal of a carrier frequency and an amplitude-modulated high-frequency pulse signal corresponding to each frequency in the frequency combination. The multi-channel digital power amplifier is used to independently amplif...

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Abstract

The invention provides a parametric array audio play system which is used for playing preset audible tones composed of a plurality of frequencies. The parametric array audio play system comprises a receiver, a high frequency pulse signal generator, a multiway digital power amplifier and an ultrasonic transducer array, wherein the receiver is used for receiving the control signal of the amplitude of each frequency in the frequency combination; the high frequency pulse signal generator is used for generating a high frequency pulse signal at carrier frequency and a modulated high frequency pulse signal of the amplitude corresponding to each frequency in the frequency combination; the multiway digital power amplifier is used for independently amplifying high frequency pulse signals at different frequencies, which are generated by the high frequency pulse signal generator, and outputting the corresponding ultrasonic signals; and the ultrasonic transducer array is used for receiving the ultrasonic signals and generating audible tones at the frequency combination. The parametric array audio play system has the advantages of simple structure, low performance requirements for ultrasonic transducer, and the like.

Description

technical field [0001] The invention relates to a parametric array audio playback system, in particular to a parametric array audio playback system for playing a plurality of preset frequency combinations. Background technique [0002] A common parametric array audio playback system is designed for broadband signals and can be used to play audio signals with rich frequencies. However, this type of system requires a special modulator and a high-frequency broadband signal power amplifier, which makes the system complex in structure and high in performance requirements. Moreover, if double-sideband amplitude modulation is used in the modulation process, harmonic distortion will be introduced; and if single-sideband amplitude modulation is used, additional signal processing is required. At the same time, it is also required that the frequency response of the ultrasonic transducer be as flat as possible. [0003] In some applications, broadband signals are not required, but a c...

Claims

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Application Information

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IPC IPC(8): H03F1/32H03F3/68
Inventor 冯声振张丽宏
Owner AAC TECH PTE LTD
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