High-sensitivity pickup and directional sound amplifying device and method thereof

Abstract

The invention discloses a high-sensitivity pickup and directional sound amplifying device and a method thereof. The high-sensitivity pickup and directional sound amplifying device comprises a power supply module, a signal processing module, a pickup and an ultrasonic transducer module. The high-sensitivity pickup and directional sound amplifying device and the method thereof are characterized in that the pickup is mounted on the side surface or back surface of the sound amplifying surface of the ultrasonic transducer module; The signal processing module is used for amplifying the weak electric signal of the pickup and is connected with the ultrasonic transducer module. The ultrasonic transducer module is used for receiving the processed electric signal and performing playing. The high-sensitivity pickup and directional sound amplifying device and the method thereof have advantages of small size, large sound pickup range, large sound amplifying coverage area, high uniformity of sound field, convenient and flexible mounting, and effective improvement for communication sound quality of handfree communication equipment.

Description

technical field [0001] The invention relates to the technical field of audio pickup and sound amplification, in particular to a high-sensitivity sound pickup and directional sound amplification device and a method thereof. Background technique [0002] Since the 20th century, audio amplification has been an indispensable engineering technology for social activities and daily work, such as multimedia teaching, conferences, variety shows, outdoor gatherings, etc. Generally, there are microphones and speakers working together. In this In many occasions, acoustic feedback will be generated due to the electro-acoustic coupling between the loudspeaker and the microphone. [0003] The appearance of acoustic feedback greatly limits the improvement of the sound reinforcement gain of the system, so that it cannot achieve the ideal sound reinforcement effect, and at the same time affects the clarity of the sound, resulting in distortion of the sound. In severe cases, howling may even ...

AI Technical Summary

Problems solved by technology

[0009] (3) The sound field has defective resonance

[0018] If it is a fixed microphone, the speaker cannot be too far away from the microphone, which limits the space for the speaker to write and talk on the whiteboard; if it is a wireless wearable microphone, usually due to wireless channel resources, cost and other factors, it is very difficult It is difficult to have only one participant, and the cost of using and maintaining wireless microphones is relatively high. In reality, there are still problems such as difficult storage of assets

[0019] 2. The speaker must be far away from the microphone

[0022] This has resulted in an increase in the manufacturing cost, installation cost, and maintenance cost of the sound reinforcement equipment, and the most important thing is that it cannot be portable and mobile.

[0023] 4. Although the hands-free intercom device usually integrates a speaker and a pickup, and can speak at a certain distance, because its pickup and playback are not in the same space, and because the communication line inevitably has a certain delay, the acoustic feedback The form of expression is not to cause howling, but to bring echo. If echo suppression is not added, the call quality is not ideal

[0028] 4. The sound volume of the traditional speaker is the largest near the speaker, while the sound of the audio-frequency directional speaker is gradually demodulated and superimposed along the propagation axis, so its energy reaches the maximum value when it is close to the effective length of the parametric array;

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