Telephone with improved speech understanding, several microphones, and special speech signal processing

摘要

Several microphones pick-up the speech signal of a corresponding subscriber and/or the background interference noise, then follows linking or computing by analog and/or digital speech and tone signal processing algorithms. The processed signal is transmitted to further subscriber, or to called subscriber. An analog and/or digital, level matched and frequency course equalised signal prod. of the processed speech signal and similarly processed background signal, phase-shifted through 180 deg., is mixed with the transmitted or received speech signal of further subscriber. Then it is supplied to the earset and/or loudspeaker of the speaking subscriber.