METHOD AND DEVICE FOR THRESHOLD COMPRESSION OF DYNAMIC VOICE SIGNAL RANGE WITH AUTOMATIC THRESHOLD MEASURING Russian patent published in 2009 - IPC H04B1/64 

FIELD: electric communication.

SUBSTANCE: invention relates to instrument building industry and may be used for warning signals transmission. Method of threshold compression of dynamic voice signal range with automatic threshold measuring is specific by the initial voice signal being added with a gilbert coupled signal. After that, the square of signal envelope is derived while determining sum of squares for each from the pair of gilbert-coupled signals. The output signal is generated by dividing one gilbert-coupled signals by compression subsignal derivable from the sum of threshold voltage and voltage derivable from signal envelope square. In addition, the square root is produced from signal envelope square calculating initial signal envelope. The result is integrated. The integrated envelope of the initial signal is compared with reference voltage by means of comparator. The signal from comparator output is inverted and multiplied by the envelope of signal received by microphone within the insonification area. For this purpose, signal from microphone output is added with gilbert-coupled signal and an envelope of the microphone received signal is identified and square root from the squares sum of each from the pair of gilbert-coupled microphone signals is derived. The resultant is integrated, scale-measured and limited by the maximum value. The resultant voltage is used for reducing initial threshold compression voltage. The device includes two quadro-phase phase-shifting units, three adders, analog divider, two square root extractors, microphone, two pairs of quadratic detectors, two integrators, scale amplifier, limiter, extractor, comparator, analog multiplier and inverter.

EFFECT: maximum speech intelligibility in case of noise effect.

2 cl, 1 dwg