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Audio-frequency playback system of parametric acoustic array and modulating method thereof

A modulation method and acoustic parameter technology, applied in the direction of amplifier combination, improved amplifier to reduce nonlinear distortion, etc., can solve the problem of increasing the burden of modulators to process audio signals, large harmonic distortion of audio signals, and the inability of acoustic parametric array audio playback systems Stability and other issues, to achieve the effect of easy implementation, low harmonic distortion, and simple modulation method

Inactive Publication Date: 2011-06-01
AAC ACOUSTIC TECH (SHENZHEN) CO LTD +1
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Problems solved by technology

Wherein, after the modulator modulates the audio signal into an ultrasonic signal through a double-sideband modulation method or a single-sideband Although the sideband modulation method reduces the harmonic distortion of the audio signal, it has special requirements for the audio signal to be modulated, thereby increasing the burden on the modulator to process the audio signal, and even making the acoustic parametric array audio playback system of the related technology unstable

Method used

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  • Audio-frequency playback system of parametric acoustic array and modulating method thereof
  • Audio-frequency playback system of parametric acoustic array and modulating method thereof
  • Audio-frequency playback system of parametric acoustic array and modulating method thereof

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] An acoustic parametric array audio playback system includes a carrier wave for transmitting signals and an ultrasonic transducer array for converting signals. Wherein, the ultrasonic transducer array is provided with several ultrasonic transducers, and the ultrasonic transducers are arranged in several groups, each group of ultrasonic transducers has a different center frequency and the center frequency is greater than or equal to the carrier frequency at the same time, or The center frequencies are all less than or equal to the carrier frequency at the same time.

[0024] In this embodiment, specifically, there are 6 groups of ultrasonic transducers, and each group has 24. The ultrasonic transducers are arranged in a staggered manner, and the center frequencies of adjacent ultrasonic transducers are different. All ultrasonic transducers are ar...

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Abstract

The invention provides an audio-frequency playback system of a parametric acoustic array, which comprises carrier waves for transferring signals and an ultrasonic transducer array for switching the signals, wherein the ultrasonic transducer array is provided with multiple ultrasonic transducers; the ultrasonic transducers are arranged in multiple groups; each group of ultrasonic transducers are provided with different central frequencies; and the central frequencies are larger than or equal to the frequency of the carrier waves or the central frequencies are less than or equal to the frequency of the carrier waves. The invention also provides a modulating method based on the audio-frequency playback system of a parametric acoustic array provided by the invention. Compared with the correlation art, the audio-frequency playback system of a parametric acoustic array provided by the invention is simple to modulate and implement and can obtain ultrasonic waves with low harmonic distortion.

Description

【Technical field】 [0001] The invention relates to an audio playback system and a modulation method thereof, in particular to an acoustic parameter array audio playback system and a modulation method thereof. 【Background technique】 [0002] With the advancement of science and technology, the digital signal field of sound is becoming more and more common, and the acoustic parametric array audio playback system has become a hot research topic for people to discuss. The acoustic parametric array audio playback system in the related art includes an audio collector for collecting audio signals, a modulator for modulating the audio signals into ultrasonic signals, and a power amplifier for amplifying and processing the ultrasonic signals into ultrasonic waves. Wherein, after the modulator modulates the audio signal into an ultrasonic signal through a double-sideband modulation method or a single-sideband Although the sideband modulation method reduces the harmonic distortion of th...

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 ACOUSTIC TECH (SHENZHEN) CO LTD
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