Acoustic transducer

Abstract

This invention relates to acoustic drivers with stationary and moving coils. Time varying signals are applied to the moving and stationary coils to control the movement of a diaphragm, which produces audible sound. The time varying signals correspond to an input audio signal such that the sound corresponds to the input audio signal. Some of the described embodiments include multiple moving coils, multiple stationary coils or both. Some embodiments include feedback for adjusting one or more of the signals based on a characteristic of the acoustic driver. Various compensation and other features of the invention are also described in relation to various embodiments.

Description

[0001] Cross References to Prior Applications [0002] This application claims the benefit of US Provisional Patent Application No. 60 / 975,339, which is incorporated herein by reference. technical field [0003] Embodiments described herein relate to acoustic transducers. Background technique [0004] Many acoustic transducers or drivers use moving coil dynamic drivers to generate sound waves. In most transducer designs, the magnets provide the flux path with an air gap. The moving coil interacts with the magnetic flux in the air gap to move the actuator. Initially, electromagnets were used to create fixed magnetic flux paths. These electromagnet-based drives suffer from high energy consumption and losses. More recently, acoustic drivers have been made from permanent magnets. Although permanent magnets consume no energy, they have a limited energy product (BH product), can be bulky, and rely on magnetic materials, they can also be expensive. In contrast, electromagnet-...

AI Technical Summary

Problems solved by technology

Although permanent magnets consume no energy, they have a limited energy product (B

Images