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US 8,897,468 B2Granted
Noise control circuit and audio receiving system using the same
AssigneesShenzhen Futaihong Precision Industry Co., Ltd., Chi Mei Communication Systems, Inc.
InventorHao Chen
Life of this patent
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Abstract
A noise control circuit includes a filter, a rectifier and a switch. The filter receives audio signals and obtains a noise signal portion of the received audio signals. The rectifier converts the noise signal portion to a current signal. The switch controls output of the audio signals according to an intensity of the current signals.
Claims9
A noise control circuit, comprising:
- a filter that receives audio signals and obtains a noise signal portion of the received audio signals;
- a rectifier that converts the noise signal portion into a current signal;
- an amplifying circuit comprising an amplifier, the amplifier comprising an inverting input terminal, a non-inverting input terminal, and an amplifying output terminal, the inverting input terminal being connected to the rectifier, the non-inverting input terminal being grounded;
- a switch that controls output of the audio signals according to intensity of the current signal;
- and
- an adjusting circuit comprising a variable resistor, the variable resistor comprising two connecting terminals and an adjusting terminal, one of the connecting terminals being connected to the amplifying output terminal, another connecting terminal being grounded, and the adjusting terminal being connected to the switch;
- wherein the amplifying circuit further includes a first resistor, a second resistor and an adjusting resistor;
- the inverting input terminal is connected to the rectifier by the first resistor, the non-inverting input terminal is grounded by the second resistor, the adjusting resistor is set between the inverting input terminal and the amplifying output terminal.
5 more elements
An audio receiving system, comprising:
- an audio receiving terminal receiving audio signals, the received audio signals comprising a noise signal portion and a voice signal portion;
- an audio amplifier amplifying the audio signals;
- a noise control circuit turning off/on the audio amplifier according to a noise signal portion of the received audio signals, the noise control circuit comprising:
- a filter that receives audio signals and obtains the noise signal portion of the received audio signals;
- a rectifier that converts the noise signal portion into a current signal;
- an amplifying circuit comprising an amplifier, the amplifier comprising an inverting input terminal, a non-inverting input terminal, and an amplifying output terminal, the inverting input terminal being connected to the rectifier, the non-inverting input terminal being grounded;
- a switch that controls output of the audio signals according to intensity of the current signals;
- and
- an adjusting circuit comprising a variable resistor, the variable resistor comprising two connecting terminals and an adjusting terminal, one of the connecting terminals being connected to the amplifying output terminal, another connecting terminal being grounded, and the adjusting terminal being connected to the switch;
- and
- a speaker outputting the audio signals amplified by the audio amplifier;
- wherein the amplifying circuit further includes a first resistor, a second resistor and an adjusting resistor;
- the inverting input terminal is connected to the rectifier by the first resistor, the non-inverting input terminal is grounded by the second resistor, the adjusting resistor is set between the inverting input terminal and the amplifying output terminal.
10 more elements
A noise control circuit, comprising:
- a filter that receives audio signals and obtains a noise signal portion of the received audio signals;
- a rectifier that converts the noise signal portion into a current signal;
- an amplifying circuit connected to the rectifier and amplifying the current signal, wherein the amplifying circuit includes an amplifier, a first resistor, a second resistor and an adjusting resistor;
- the amplifier includes an inverting input terminal, a non-inverting input terminal, and an amplifying output terminal, the inverting input terminal is connected to the rectifier by the first resistor, the non-inverting input terminal is grounded by the second resistor, and the adjusting resistor is set between the inverting input terminal and the amplifying output terminal;
- and
- a switch that controls output of the audio signals according to intensity of the current signal;
- wherein the switch comprises a predetermined current signal intensity range, when the intensity of the current signals is within the predetermined current signal intensity range, the switch controls output of the audio signal;
- when the intensity of the current signals is outside the predetermined current signal intensity range, the switch controls the audio signal to stop outputting the audio signal.
5 more elements
Dependencies are inferred from the claim text.