WIRELESS MICROPHONE Russian patent published in 2001 - IPC

FIELD: radio engineering, systems for transmission of audio ( speech ) information. SUBSTANCE: wireless microphone has reference quartz self-excited oscillator, buffer radio frequency amplifier and microphone amplifier with feedback. It is supplemented with double press-to-talk switch, two controlled keys and single-shot multivibrator with universal start. Quartz self-excited oscillator has additional positive feedback on odd harmonics of quartz that expands bandwidth of common loop of feedback. Buffer amplifier carries out filtration of high harmonics artificially created by self-excited oscillator and decoupling of antenna. EFFECT: provision for speed-up of process of start of self-excited oscillator, expansion of dynamic range and reduction of duration of transient commutation processes. 2 dwg