Panasonic Intellectual Property Management Co., Ltd.

Keiji Yamahai

Ryosuke Kitago

Yuji Kawasaki

Hirotaka Fukutsuka

A sound amplification apparatus includes one or more microphones that convert collected sound into an audio signal and transmit the audio signal by radio and a sound receiving apparatus that receives the audio signal transmitted from the microphone and amplifies and outputs the sound based on the audio signal. The sound receiving apparatus is configured to perform sound output control in an emergency mode upon receiving an emergency signal transmitted in response to operation of an emergency switch of the microphone. With this configuration, it is possible to perform appropriate sound control in a dangerous situation such as intrusion of a suspicious person.

Alarm notifying system

A sound amplification apparatus () comprises one or more microphones () that convert collected sound into an audio signal and transmit the audio signal by radio and a sound receiving apparatus () that receives the audio signal transmitted from the microphone () and amplifies and outputs the sound based on the audio signal. The sound receiving apparatus () is configured to perform sound output control in an emergency mode upon receiving an emergency signal transmitted in response to operation of an emergency switch () of the microphone (). With this configuration, it is possible to perform appropriate sound control in a dangerous situation such as intrusion of a suspicious person.

Sound receiving apparatus, sound receiving method, sound receiving system, and wireless microphone

An acoustic feedback suppression apparatus includes an amplitude measurement section for measuring the amplitude of a sound signal input from a microphone, an amplitude attenuation section for attenuating the amplitude of a sound signal output to a speaker, and an acoustic feedback determination section for determining whether or not acoustic feedback is occurring based on the sound signal input from the microphone. If it is determined that acoustic feedback is occurring, a sound-deadening control section enables sound-deadening control so that the amplitude of the sound signal output to the speaker is attenuated to a sound-deadening level. A sound-deadening release section releases the sound-deadening control if the amplitude of the sound signal input from the microphone is more than specified threshold amplitude and if it is determined that acoustic feedback is not occurring while the sound-deadening control is conducted.

Acoustic feedback suppression apparatus, microphone apparatus, amplifier apparatus, sound amplification system, and acoustic feedback suppression method

Growing community of inventors

Fukuoka, Japan

Keiji Yamahai