Acoustic transducer

摘要

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.

主权项

1. An acoustic transducer comprising:
an audio input terminal for receiving an input audio signal; one or more stationary coils for inducing a magnetic flux path; one or more moving coils coupled to a moving diaphragm, wherein the one or more moving coils are disposed at least partially within the magnetic flux path; a control system coupled to the input terminal and adapted to produce a time-varying stationary coil signal in at least one of the stationary coils and to produce a time-varying moving coil signal in each of the one or more moving coils, and wherein all of the stationary coil signals and the moving coil signals are dependent on the input audio signal, wherein the movement of the diaphragm is in response to the stationary coil signals and the moving coil signal, and wherein the control system includes:
a stationary coil signal generation block to generate one or more stationary coil control signals corresponding to the input audio signal;one or more stationary coil current regulators to generate the stationary coil signals corresponding to the stationary coil control signals;a moving coil signal block to generate one or more moving coil control signals corresponding to the input audio signal; andone or more moving coil current regulators to generate the moving coil signals corresponding to the moving coil control signals.