US 8,077,875 B2 · Audio device

Abstract

An audio device includes a jack, a switch, an amplifier, an internal sound producer, and a determining circuit. The jack establishes a connection with an external sound producer. The switch is in an opened state when the connection is established, and in a closed state when the connection is open. The amplifier amplifies audio signals to amplified audio signals and sends the amplified audio signals to the switch. The determining circuit receives the amplified audio signals from the switch, and generates a high voltage to control the amplifier not to output the amplified audio signals to the internal sound producer when the switch is in the closed state, and generates a low voltage to control the amplifier to output the amplified audio signals to the internal sound producer. The determined circuit further filters out the amplified audio signals when the switch is in the opened state.

Claims18

Dependent claims

An audio device comprising:

a jack for establishing a connection with an external sound producer;
a switch being in an opened state when the connection of the jack and the external sound producer is established, and in a closed state when the connection is open
an amplifier for amplifying audio signals and sending the amplified audio signals to the switch;
an internal sound producer for receiving the amplified audio signals from the amplifier and converting the amplified audio signals to sound;
and
a determining circuit for receiving the amplified audio signals from the switch, and generating a high voltage to control the amplifier not to output the amplified audio signals to the internal sound producer when the switch is in the opened state, and generating a low voltage to control the amplifier to output the amplified audio signals to the internal sound producer and further filtering out the amplified audio signals when the switch is in the closed state.

3 more elements

An audio device comprising:

a jack detachably and electrically connected to an external sound producer;
a switch electrically connected to the jack in a closed state when the jack is not connected to the external sound producer, and disconnected from the jack in an opened state when the jack is connected to the external sound producer;
an amplifier electrically connected to the jack and amplifying audio signals to amplified audio signals, and sending the amplified audio signals to the switch;
an internal sound producer electrically connected to the amplifier for receiving the amplified audio signals from the amplifier and converting the amplified audio signals to sounds;
a determining circuit electrically connected to the amplifier and the switch for receiving amplified audio signals, and generating a high voltage to control the amplifier not to output the amplified audio signals to the internal sound producer when the switch is in the opened state, and generating a low voltage to control the amplifier to output the amplified audio signals to the internal sound producer and further filtering out the amplified audio signals when the switch is in the closed state.

2 more elements

Dependencies are inferred from the claim text.

Audio device

Life of this patent

Audio device

Life of this patent

Abstract

Claims18