US 2015/0030167 A1 · Method of Detecting Enclosure Leakage of Enclosure Mounted Loudspeakers

Abstract

A method of detecting enclosure leakage of an electrodynamic loudspeaker mounted in an enclosure or box may include applying an audio signal to a voice coil of the electrodynamic loudspeaker through an output amplifier and detecting a voice coil current flowing into the voice coil. A voltage across the voice coil may be detected and an impedance or admittance of the loudspeaker across a predetermined audio frequency range may be detected based on the detected voice coil current and voice coil voltage. A fundamental resonance frequency of the loudspeaker may be determined based on the detected impedance or admittance and compared with a nominal fundamental resonance frequency of the loudspeaker representing a sealed state of the enclosure. Acoustic leakage of the enclosure may be detected based on a deviation between the determined the fundamental resonance frequency and the nominal fundamental resonance frequency of the electrodynamic loudspeaker.

Claims24

Dependent claims

A method of detecting enclosure leakage of an electrodynamic loudspeaker mounted in an enclosure, comprising steps of:

applying an audio signal to a voice coil of the electrodynamic loudspeaker through an output amplifier,
detecting a voice coil current flowing into the voice coil,
detecting a voice coil voltage across the voice coil,
detecting one of an impedance and admittance of the loudspeaker across a predetermined audio frequency range based on the detected voice coil current and voice coil voltage,
determining a fundamental resonance frequency of the loudspeaker based on the detected impedance or admittance,
comparing the determined the fundamental resonance frequency of the loudspeaker with a nominal fundamental resonance frequency of the loudspeaker representing a sealed state of the enclosure,
detecting acoustic leakage of the enclosure based on a deviation between the determined the fundamental resonance frequency and the nominal fundamental resonance frequency of the electrodynamic loudspeaker.

4 more elements

A leakage detection assembly for an enclosure mounted electrodynamic loudspeaker, comprising:

an audio signal input for receipt of an audio input signal supplied by an audio signal source,
an output amplifier configured to receive the audio input signal and generate a corresponding voice coil voltage at a pair of output terminals connectable to a voice coil of an electrodynamic loudspeaker,
a current detector configured for detecting a voice coil current flowing into the electrodynamic loudspeaker in response to the application of the voice coil voltage;
and
a signal processor configured to:
detecting one of an impedance and an admittance of the loudspeaker across a predetermined audio frequency range based on the detected voice coil current and voice coil voltage,
determining a fundamental resonance frequency of the loudspeaker based on the detected impedance or admittance,
comparing the determined the fundamental resonance frequency of the loudspeaker with a nominal fundamental resonance frequency of the loudspeaker representing a sealed state of the enclosure,
detecting enclosure leakage based on a deviation between the determined the fundamental resonance frequency and the nominal fundamental resonance frequency of the electrodynamic loudspeaker.

6 more elements

Dependencies are inferred from the claim text.

Method of Detecting Enclosure Leakage of Enclosure Mounted Loudspeakers

Life of this patent

Method of Detecting Enclosure Leakage of Enclosure Mounted Loudspeakers

Life of this patent

Abstract

Claims24