Back to results
US 7,925,237 B2Granted
Noise suppression circuit for mobile phone
AssigneeSamsung Electronics Co., Ltd.
InventorsSang Soon Kim, Ji Hyuk Cho
Life of this patent
Estimating the term…
Abstract
A noise suppression circuit and method for a mobile phone is disclosed that includes a codec for decoding a received audio signal; a speaker for reproducing the audio signal; and a low-pass filter, which includes: a resistor; and a varactor and a capacitor connected in parallel to ground. Characteristics of the low-pass filter are adjusted according to usage conditions, thereby effectively suppressing a white noise and popup noise during an ongoing call.
Claims11
A noise suppression circuit for a mobile phone comprising:
- a coder/decoder (codec) for decoding a received audio signal;
- a speaker for reproducing the audio signal;
- and
- a low-pass filter having a variable capacitor, for reducing noise in the audio signal by adjusting the variable capacitor according to volume of the audio signal,
- wherein when the audio signal is an internally generated acoustic signal, the capacitance of a varactor of the low-pass filter is increased immediately before turning on the codec and is decreased immediately before reproduction of the audio signal.
2 more elements
A method of suppressing noise in a mobile phone, the method comprising:
- decoding a received audio signal;
- low pass filtering the signal according to volume of the signal, wherein a low pass filter for filtering the signal includes a varactor;
- increasing a capacitance of the varactor when a voice signal is not present in the audio signal;
- and
- decreasing the capacitance of the varactor when the voice signal is present,
- wherein when the audio signal is an internally generated acoustic signal, the capacitance of the varactor is increased immediately before turning on a coder/decoder (codec) for decoding a received audio signal, and the capacitance of the varactor is decreased immediately before reproduction of the audio signal.
3 more elements
Dependencies are inferred from the claim text.