Digital loudspeaker drive method and device based on quaternary code dynamic mismatch reshaping

Abstract

The invention relates to a digital loudspeaker drive method and a device based on quaternary code dynamic mismatch reshaping. The method comprises the steps of (1) conducting input format conversion, (2) conducting multi-bit sigma to delta modulation, (3) conducting thermometer code conversion, (4) conducting dynamic mismatch reshaping processing, (5) conducting channel data combination and mapping coding, (6) controlling metal-oxide-semiconductor field effect transistor (MOSFET) pipe of a full-bridge power amplifier network to conduct opening and closing status switching, and driving a digitalized loudspeaker load to produce sound. The device comprises a sound source (1), a digital format converter (2), a multi-bit sigma to delta modulator (3), a thermometer coder (4), a dynamic mismatch reshaper (5), a channel data combiner (6), a mapping coder (7), a multi-channel digital amplifier (8) and the digitalized loudspeaker load (9). The units are sequentially connected in order. According to the digital loudspeaker drive method and the device based on quaternary code dynamic mismatch reshaping, use efficiency of an amplifier pipe and the load is improved, development periods and hardware implementation cost are saved, and good immunity is provided for frequency response deviation of digital channels.

Description

technical field [0001] The invention relates to a digital loudspeaker driving method and device based on dynamic mismatch shaping, in particular to a digital loudspeaker driving method and device based on quaternary code dynamic mismatch shaping. Background technique [0002] With the vigorous development of large-scale integrated circuits and digital technology, the inherent defects of traditional analog speaker systems in terms of power consumption, volume, weight and signal transmission, storage, processing, etc. are becoming more and more obvious. In order to overcome these defects, the speaker system's R&D is gradually developing in the direction of low power consumption, small appearance, digitization and integration, forming a new research field with the digitization of the speaker system as the core of the research. [0003] The research focus of the digital loudspeaker system includes: digital coding modulation technology, digital power drive technology and digital ...

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Problems solved by technology

Among them, the digital system circuit of 1-bit Σ-Δ modulation is relatively simple to implement, but the system itself has the following defects: ①It is sensitive to clock jitter, and it is easy to introduce nonlinear distortion due to clock jitter; ②In order to maintain the modulation structure Stability, the allowable dynamic range of the input signal is small; ③ requires a high switching rate, and the power MOSFET tube will produce more nonlinear distortion components in the process of driving the speaker load for high-speed switching, and will also cause MOSFET tube heating increases, temperature rises and efficiency decreases

At present, existing literature has proposed a ternary state encoding based on "-1", "0" and "+1" and a quaternary state encoding of "-1", "0H", "0L" and "+1". The digital loudspeaker driving method, and for the "-1", "0" and "+1" triple code situation, a dynamic mismatch shaping method based on the triple code is proposed, but in the driving process of the multi-channel digital speaker array Among them, these existing methods do not solve the problem of inconsistency in the frequency response between speaker units, especially in the dynamic mismatch shaping method based on the three states of "-1", "0" and "+1", due to It combines the two states of "0H" and "0L" to be equivalent to the "0" state, and does not study the dynamic mismatch shaping process in the process of switching between the two states of "0H" and "0L". Compared with the metacode dynamic mismatch method, this ternary code dynamic mismatch method does not achieve a better sound quality level because it ignores the switching of the "0" state, and its shaping processing results are worse than binary code shaping processing results Some

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