All-digital loudspeaker system and working method thereof

Abstract

The invention provides an all-digital loudspeaker system and a working method thereof. The system comprises a digital signal processing module, a switching circuit, a digital loudspeaker and a power supply, and the digital signal processing module, the switching circuit and the digital loudspeaker are connected in sequence. The problems of ultrasonic radiation, signal distortion and poor frequencyresponse of an existing digital loudspeaker can be solved.

Description

technical field [0001] The present invention relates to the field of loudspeaker technology, and more specifically, to an all-digital loudspeaker system and its working method. Background technique [0002] With the rapid development of large-scale integrated circuit manufacturing technology and the continuous emergence of new materials, the trend of integration and digitalization of electroacoustic products is becoming more and more obvious. As one of the leading devices in the electro-acoustic industry, the design and manufacture of loudspeakers and their drive systems are gradually developing towards low power consumption, low noise, miniaturization, high fidelity, and digitalization. Looking back at the development history of loudspeakers and their drive systems, and looking forward to future development trends, it can be divided into three stages: analog loudspeaker systems, semi-digital loudspeaker systems and full-digital loudspeaker systems. The traditional analog s...

AI Technical Summary

Problems solved by technology

[0004] (1) Each element of the transducer array requires a high frequency, which requires a frequency of more than twice the audio frequency (ultrasonic frequency band) to meet the sampling frequency requirements of digital-to-analog conversion, which is difficult to achieve

[0005] (2) If the bandwidth of the transducer load can cover the ultrasonic frequency band, then when it plays a digital pulse signal, there will be ultrasonic radiation in the air, which will affect the human body

[0006] (3) There is a certain difference in the propagation path delay of each array element of the transducer array to reach the spatial position point, which will lead to uneven distribution and distortion of the spatial domain SNR of the analog signal synthesized after the radiation sound field of each array element is superimposed

[0007] (4) Due to the sharp increase in the number of voice coils in multi-voice coil digital speakers, the weight of the voice coils increases sharply, causing the response frequency of the speaker diaphragm to drop sharply, narrowing the frequency band of the speaker, and deteriorating high-frequency characteristics

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