Audio conference system with quality-improving features by compensating sensitivities microphones and the method thereof

7) A quality-improving method for audio conference by compensating sensitivities of microphones, comprising the following proceedings:

• which collecting analog voice signals from at least three microphones;
• making a microphone array, which is consisted of said microphones with known locations;
• digitizing analog signals immediately after accepted from said microphones by a converter, and obtaining time differences of the audio wave at the at least three microphones;
• locating the position of voice sources by calculating the time differences by a processor;
• amplifying signals due to amplitude of and distance from voice sources by two digital gain controls;
• and
• making compensation for the signals acquired by the processor by a digital compensation soft wave.

12) A quality-improving method for audio conference by compensating sensitivities of microphones comprising the following proceedings:

• collecting analog voice signals from at least three microphones receiving a voice source;
• distinguishing travel time difference from voice source to respective microphones by a high-speed analogue to digital converter;
• locating the voice source by calculating the algorithm in terms of the travel time differences and representing the location of the voice source by the distance and directional angle;
• and
• using the directional angle to calculate the necessary gain of the microphone and recover the sensitivity of the microphone(s).