Audio speaker system using piezo diaphragm
AssigneeDiodes Incorporated
InventorHideto Takagishi
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Abstract
An audio speaker system includes: an amplifier, where a positive input terminal of the amplifier is configured to be coupled to a first reference voltage node; and a piezo diaphragm including: a metal plate; a first piezo film attached to the metal plate, where the first piezo film is configured to function as a speaker during operation of the audio speaker system; and a second piezo film attached to the metal plate and spaced apart from the first piezo film, where the second piezo film is configured to function as a microphone during operation of the audio speaker system, where an output terminal of the amplifier is coupled to the first piezo film, and where a negative input terminal of the amplifier is coupled to the second piezo film.
Claims20
An audio speaker system comprising:
- an amplifier, wherein a positive input terminal of the amplifier is configured to be coupled to a first reference voltage node;
- and
- a piezo diaphragm comprising:
- a metal plate;
- a first piezo film attached to the metal plate, wherein the first piezo film is configured to function as a speaker during operation of the audio speaker system;
- and
- a second piezo film attached to the metal plate and spaced apart from the first piezo film, wherein the second piezo film is configured to function as a microphone during operation of the audio speaker system, wherein an output terminal of the amplifier is coupled to the first piezo film, and wherein the second piezo film is coupled to an input node of a voltage divider, and an output node of the voltage divider is coupled to a negative input terminal of the amplifier.
An audio speaker system comprising:
- a piezo diaphragm comprising:
- a metal plate;
- a first piezo film attached to the metal plate;
- and
- a second piezo film attached to the metal plate, wherein the second piezo film is at least partially surrounded by the first piezo film and is spaced apart from the first piezo film;
- and
- an amplifier, wherein an output terminal of the amplifier is coupled to the first piezo film, wherein a negative input terminal of the amplifier is coupled to an output node of a voltage divider, and an input node of the voltage divider is coupled to the second piezo film, and wherein a positive input terminal of the amplifier is configured to be coupled to a first reference voltage node.
A method of playing an audio signal using a piezo diaphragm, the method comprising:
- receiving the audio signal at a positive input terminal of an amplifier or a negative input terminal of the amplifier;
- supplying a reference voltage to the positive input terminal of the amplifier;
- sending an output signal of the amplifier to a first piezo film of the piezo diaphragm, wherein the first piezo film is configured to convert the output signal of the amplifier into motion of the first piezo film;
- kinetically coupling the first piezo film to a second piezo film of the piezo diaphragm, wherein the second piezo film is configured to convert motion of second piezo film into an electrical signal;
- and
- feeding a divided signal of the electrical signal obtained through a voltage divider back to the negative input terminal of the amplifier.
Dependencies are inferred from the claim text.