Electronic voice network for a telephone subscriber's substation
AssigneesGTE Automatic Electric Labs Inc., GTE Labs Inc.
InventorsWilliam Stobbs, Charles Hines, Rickey W. Light
Life of this patent
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Abstract
A circuit which performs loop supervision, transmit, receive, and transmit and receive regulation and sidetone balance. A loading circuit shunts excess current from the transmit and receive circuits under short loop conditions. The loading circuit also controls regulation of the transmit and receive circuits. Use of constant current power supplies external to the transmit and receive circuits prevents modulation of the power supplies.
Claims8
A voice network for a telephone subscriber's substation, connected to a telephone central office via a loop circuit, said central office operated to generate a bias signal and a first group of voice frequency signals of varying amplitude, said voice network comprising:
- loading means connected to said loop circuit operated in response to predetermined levels of said bias signal to shunt corresponding predetermined portions of said bias signal;
- transmit regulation means connected to said loop circuit and operated in response to predetermined levels of said bias signal to provide a transmit regulation control signal having corresponding predetermined levels of amplitude;
- receive regulation means connected to said loop circuit and operated in response to predetermined levels of said bias signal to provide a receive regulation control signal having corresponding predetermined levels of amplitude;
- transmitting means connected to said loop circuit and said transmit regulation means and operated to generate a second group of voice frequency signals of varying amplitude;
- receiving means connected to said loop circuit and said receive regulation means and operated in response to said first group of voice frequency signals to generate audible signals of varying amplitude;
- and
- current control means operated to provide a constant current power supply for said transmitting and receiving means;
- said transmitting means further operated in response to said transmit regulation control signal of predetermined levels of amplitude to attenuate the amplitude of said second group of voice frequency signals by corresponding predetermined amounts;
- said receiving means further operated in response to said receive regulation control signal of predetermined levels of amplitude to attenuate the amplitude of said audible signals by corresponding predetermined amounts.
Dependencies are inferred from the claim text.