Self regulating telephone sets

Claim 1

A self regulating telephone set for a telephone system having a local plant and long distance trunk circuits comprising a transmitting transducer receiving voice signals represented by product waves of the form f(A)t × f(B)t where f(A)t represents the amplitude of informational signal f(B)t and a high frequency wave f(B)t, said voice signals being converted to representative electrical signals, a first demodulator receiving said representative signals, said first demodulator providing output signals permitting separation thereafter of the signal representative of f(B)t and the signal representative of f(A)t, a high frequency branch including a first high pass filter, a first amplifier of preselected gain to nullify losses, and a second high pass filter in a series arrangement in the recited sequence, said high frequency branch passing exclusively the signal representative of f(B)t, a low frequency branch including a first low pass filter, a center clipper, a second amplifier, a limiter, and a second low pass filter in a series arrangement in the recited sequence, said low frequency branch passing only the signal representative of f(A)t, said second amplifier having a preselected gain to nullify incidental losses, a modulator simultaneously receiving the output signals at predetermined magnitudes from said high and low pass branches to provide a constant output transmission signal therefrom to obtain a preselected volume for said local plant and long distance trunk circuits.