Patent ID: 6711258
Filing Date: 2004-03-23
Classification: H04M

Abstract:
A method for controlling a volume in a digital telephone with a DSP (digital signal processor), comprising:a ring signal adjustment step for setting up a call, measuring a noise, and adjusting an amplitude of a ring signal in accordance with the measured noise when a phone call is received at a standby state; and a received sound adjustment step for collecting the noise from a call-start to a call-end, measuring the amplitude of the noise, determining a level of a received sound on the basis of the measured amplitude of the noise, and adjusting an amplitude of received sound, wherein the level of received sound in the received sound adjustment step comprises several stages and is determined by comparing the sound pressure of the measured noise with reference to sound pressures of the stages, and wherein to prevent frequent change of levels due to errors in discriminating between a voice and a non-voice and an accidental noise, the determined level of the received sound is set as a level for a current frame when same levels are continued for a certain number of frames.