US 4,052,560 A · Loudspeaker distortion reduction systems

Abstract

In order to improve the response of a signal transducer of the type which converts an electrical signal into a different form of energy, for example a loudspeaker, and in particular to cause the output produced by the transducer to constitute a more faithful reproduction of the original electrical signal, the input of the signal transducer is connected to a first signal path which provides a signal component proportional to the signal to be reproduced, and to at least one second signal path connected in parallel with, and conducting signals in the same direction as, the first signal conducting path and producing a second signal component which is proportional to a function of at least one of the time derivative and the time integral of the original signal to be reproduced. In preferred embodiments of the invention, the second signal path includes both a time differentiator and a time integrator, connected together in parallel and each adjusted to provide a signal component which acts to substantially compensate for one respective major source of distortion inherent in the transducer.

Claims10

Dependent claims

An electrical circuit unit arranged to be connected between a source of a time-varying electrical signal composed of frequency components extending across the audio frequency range and a loudspeaker having an electrical signal input to cause the sound output of the loudspeaker to constitute an accurate representation of the electrical signal, comprising:

means defining an input terminal for receiving the electrical signal from such source;
means defining an output terminal arranged to be connected to the loudspeaker signal input;
means defining a signal transmission path connected between said input terminal and said output terminal for supplying to said output terminal a signal component proportional to the electrical signal;
and distortion compensating means having an input connected to said input terinal and an output connected to said output terminal for producing, at its output, a signal component constituting a function of at least one of the time derivative and the time integral of the signal appearing at its input, said distortion compensating means comprising integrator means and function generator means connected for supplying to said distortion compensating means output a signal proportional to a predetermined non-linear function of the time integral of the signal appearing at its said input, at least with respect to signal components whose frequencies extend over the lower portion of the audio frequency range.

1 more element

means defining an input terminal for receiving the electrical signal from such source;
means defining an output terminal arranged to be connected to the loudspeaker signal input;
means defining a signal transmission path connected between said input terminal and said output terminal for supplying to said output terminal a signal component proportional to the electrical signal;
and distortion compensating means having an input connected to said input terminal and an output connected to said output terminal for producing, at its output, a signal component constituting a function of at least one of the time derivative and the time integral of the signal appearing at its input, wherein said distortion compensating means comprise differentiator means and function generator means connected for supplying to said distortion compensating means output a signal proportional to a predetermined non-linear function of the time derivative of the signal at said distortion compensating means input, at least with respect to signal components whose frequencies extend over the upper portion of the audio frequency range.

1 more element

Dependencies are inferred from the claim text.

Loudspeaker distortion reduction systems

Life of this patent

Loudspeaker distortion reduction systems

Life of this patent

Abstract

Claims10