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Multi-scene directional loudspeaker system based on DSP platform, and operation method of system

A speaker system and multi-scenario technology, which is applied in the application field of speaker directional transmission, can solve the problems of not being able to meet the needs of multiple scenes, not being able to realize audio direction, and not having portable installation, etc., to achieve cost reduction, cycle shortening, and good adaptability Effect

Inactive Publication Date: 2019-02-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent has the following defects: the patent has made a lot of improvements in many digital signal processors in order to reduce the DAC background noise. In the input module, digital audio processing module, noise reduction module, each step of the post-processing unit is very cumbersome, complex design process
However, this patent has the following defects: it is not advisable to upgrade and replace the entire set of equipment in order to ensure safety, and the cost is higher than that of an ordinary audio system
This patent cannot achieve audio orientation, cannot meet the needs of multiple scenarios, and does not handle portable installation

Method used

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  • Multi-scene directional loudspeaker system based on DSP platform, and operation method of system
  • Multi-scene directional loudspeaker system based on DSP platform, and operation method of system
  • Multi-scene directional loudspeaker system based on DSP platform, and operation method of system

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0050] A multi-scene directional speaker system based on DSP platform, such as figure 1 As shown, it includes a bluetooth module, a preamplifier, a digital signal processing platform, a power amplifier, an impedance matching network, and an ultrasonic transducer array connected in sequence;

[0051] The digital signal processing platform includes AD converters, digital signal processing modules, and DA converters connected in sequence;

[0052] Such as figure 2 As shown, digital signal processing includes dynamic range control of audio signals, distortion preprocessing and audio modulation;

[0053] Dynamic range control refers to different ways of processing the amplitude changes of the full-band signal, including signal compression, signal limiting, signal expansion and signal noise filtering; the transfer function of the DSP dynamic processor can be adjusted arbitrarily, and it can combine several dynamic The processing functions are combined into one function curve. Si...

Embodiment 2

[0062] According to a kind of multi-scene directional speaker system based on DSP platform described in embodiment 1, its difference is:

[0063]The directional speaker system also includes an infrared sensor module, which is connected to a digital signal processing module. The infrared sensor module is used to sense whether a person enters the coverage area of ​​the speaker system. If detected, the infrared sensor module is triggered and the speaker system starts, otherwise , the speaker system does not start. The matching scenario is similar to that when a person enters a certain row of products in a supermarket, the product information will be played automatically, and it will not start when there is no one there.

[0064] The ultrasonic transducer array includes a plurality of ultrasonic transducers, and the plurality of ultrasonic transducers are evenly arranged on the printed circuit board, and the plurality of ultrasonic transducers form a circle, ellipse, rectangle or ...

Embodiment 3

[0075] The operation process of the multi-scene directional speaker system based on the DSP platform described in embodiment 2 includes:

[0076] The audio signal is connected or directly input by the Bluetooth module, the audio signal is amplified through the preamplifier, and the AD conversion is performed on the digital signal processing platform, and the noise reduction processing of the digital signal processing module is performed, and the DA conversion is performed. , the infrared sensing module determines whether to add it according to the specific application scenario. After the signal preprocessing and modulation module is executed by the FPGA, the ultrasonic signal is modulated by the audio signal, amplified by the power amplifier, and the ultrasonic transducer array will be modulated and amplified The signal radiates into the air to realize the directional transmission of audio in the air.

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Abstract

The invention relates to a multi-scene directional loudspeaker system based on a DSP platform, and an operation method of the system. The system comprises a Bluetooth module, a pre-amplifier, a digital signal processing platform, a power amplifier, an impedance matching network, an ultrasonic transducer array, and an infrared sensing module, wherein the digital signal processing platform comprisesan AD converter, a digital signal processing module and a DA converter which are connected in sequence. The system provided by the invention can be applied in fields such as business video conferences, advertisements, exhibitions, blind guiding, terminal buildings, bus stations, morning excises in parks or residential communities, square dances, fairway guidance, air traffic security guidance, anti-terrorism actions and the like, so that directional music playing, directional information broadcasting and announcements for determined groups can be achieved; and the system can also be used in amultichannel surround sound home theater, so that ultrasonically modulated audio signals can be projected onto a wall or a celling, a virtual sound source can be created on a reflection surface to generate enhanced 3D sound effects, and a loudspeaker array need not be really placed on the wall or the ceiling.

Description

technical field [0001] The invention relates to the technical field of loudspeakers and sound box systems, in particular to the application of loudspeaker directional transmission. Background technique [0002] The development of traditional loudspeakers has been quite mature and can bring wonderful auditory experience to users. Since the sound propagation of traditional speakers is divergent, the speaker itself cannot effectively control the direction of sound propagation. Therefore, mutual interference and noise pollution will occur between different sound sources. [0003] In order to solve this problem, in recent years, people have developed a new type of directional loudspeaker, which can produce directional audible sound. Commonly used sound-focusing speakers can use a method similar to a flashlight to focus the sound, using a parabolic reflective surface to focus the sound. The sound quality is the clearest in the parabolic dome, so that the sounds played in each are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R1/20H04R3/00
CPCH04R1/20H04R3/00H04R2420/03
Inventor 孔繁敏王紫莹
Owner SHANDONG UNIV
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