Precise tone signal generator

Tone signal generating means operable to generate selected tone signals for use in an associated telecommunication system comprising:

• an oscillator circuit operated to generate signals at a first frequency;
• a plurality of different frequency divider circuits each connected to said oscillator circuit and each operated in response to said oscillator circuit output signals to generate different output signals at frequencies different than that of said oscillator circuit;
• at least one summing circuit;
• a plurality of tone selector circuits each including a first input connected to a different one of said frequency divider circuits, a second input connected to selection circuitry of said telecommunications system and an output connected to said summing circuit, selectively operated in response to a signal from said telecommunication system selection circuitry to couple said selected connected frequency divider circuit output signals to said summing circuit;
• first filter means connected between said summing circuit and the output of said tone signal generating means;
• said summing circuit operated in response to one or more selected frequency divider circuit output signals coupled from said tone selector circuits to couple the sum of said signals to said filter means;
• said filter means operated to condition said sum signal and couple said conditioned signal to said telecommunications system.