US 2006/0153400 A1 · Microphone and sound amplification system

Abstract

Microphone includes: a microphone element; a simulative feedback signal generation section that generates a simulative feedback signal simulating a feedback signal generated by a sound, produced via a speaker, returning the microphone element; and an arithmetic operator that subtracts the simulative feedback signal, generated by the simulative feedback signal generation section, from a sound signal collected by the microphone element, to thereby output the subtraction result as a residual signal. The residual signal output by the arithmetic operator is supplied to an amplifier device of the speaker as an output signal of the microphone. The simulative feedback signal generation section includes a delay circuit that delays the residual signal, output by the arithmetic operator, by a given time, and an adaptive filter that generates the simulative feedback signal by filtering a previous residual signal delayed by the delay circuit. The adaptive filter updates a filter coefficient on the basis of the previous residual signal delayed by the delay circuit and a current residual signal output by the arithmetic operator.

Claims13

Dependent claims

A microphone comprising:

a microphone element;
a simulative feedback signal generation section that generates a simulative feedback signal simulating a feedback signal generated by a sound, produced via a speaker, entering said microphone element;
and
an arithmetic operator that subtracts the simulative feedback signal, generated by said simulative feedback signal generation section, from a sound signal collected by said microphone element, to thereby output a result of the subtraction as a residual signal,
wherein the residual signal outputted by said arithmetic operator is supplied to an amplifier device of the speaker as an output signal of said microphone.

2 more elements

A sound amplification system comprising:

a microphone including a sound-collecting microphone element;
an amplifier device including a signal processing circuit that amplifies, and/or adjusts sound quality of, a sound signal inputted via said microphone;
and
a speaker that audibly reproduces the sound signal outputted by said amplifier device,
wherein said microphone further includes:
a simulative feedback signal generation section that generates a simulative feedback signal simulating a feedback signal generated by a sound, produced via a speaker, entering said microphone element;
an arithmetic operator that subtracts the simulative feedback signal, generated by said simulative feedback signal generation section, from the sound signal collected by said microphone element, to thereby output a result of the subtraction as a residual signal, the residual signal outputted by said arithmetic operator being supplied to said amplifier device as an output signal of said microphone;
and
a simulating amplifier filter that filters the residual signal, outputted by said arithmetic operator, with a transfer function simulative of a characteristic of said amplifier device, said simulative feedback signal generation section generating the simulative feedback signal on the basis of an output signal of said simulating amplifier filter.

6 more elements

A sound amplification system comprising:

a microphone including a sound-collecting microphone element;
an amplifier device including a signal processing circuit that amplifies, and/or adjusts sound quality of, a sound signal inputted via said microphone and
a speaker that audibly reproduces the sound signal outputted by said amplifier device,
wherein said amplifier device further includes a transmitter section that transmits to said microphone the sound signal amplified and/or adjusted in sound quality by the signal processing circuit, and
wherein said microphone further includes:
a simulative feedback signal generation section that generates a simulative feedback signal simulating a feedback signal generated by a sound, produced via a speaker, entering said microphone element;
an arithmetic operator that subtracts the simulative feedback signal, generated by said simulative feedback signal generation section, from the sound signal collected by said microphone element, to thereby output a result of the subtraction as a residual signal, the residual signal outputted by said arithmetic operator being supplied to said amplifier device as an output signal of said microphone;
and
a receiver section that receives the signal transmitted by said transmitter section of said amplifier device, said simulative feedback signal generation section generating the simulative feedback signal on the basis of the signal received by said receiver section.

6 more elements

Dependencies are inferred from the claim text.

Microphone and sound amplification system

Life of this patent

Microphone and sound amplification system

Life of this patent

Abstract

Claims13