Electronic voice circuit configuration
First Claim
Patent Images
1. An electronic voice circuit configuration, comprising:
- first and second line terminals to be connected to a telephone line;
a calling part connected to said line terminals;
a modulator circuit having an input side connected to said line terminals and having an output side;
first, second and third nodes connected to said output side of said modulator circuit;
a transmitting device connected to said modulator circuit for transmitting signals;
a receiving device connected to said modulator circuit for receiving signals;
an equipment impedance device having an input side coupled through said first, second and third nodes to said modulator circuit and having an output side;
fourth, fifth and sixth nodes connected to said output side of said equipment impedance device; and
a control device connected through said fourth, fifth and sixth nodes to said output side of said equipment impedance device;
said first and fourth nodes and said first line terminal carrying potentials forming a positive line path, and said second and fifth nodes and said second line terminal carrying potentials forming a negative line path;
said third node carrying a first mid-potential and said sixth node carrying a second mid-potential; and
the potentials at said first and second nodes being symmetrical with respect to the first mid-potential, and the potentials at said fourth and fifth nodes being symmetrical with respect to the second mid-potential.
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Abstract
An electronic voice circuit configuration can be connected through a first and a second line terminal to a telephone line. The electronic voice circuit configuration has a calling part, a transmitting device, a receiver device, a symmetrical modulator circuit with voltage stabilization, a symmetrical equipment impedance device with a device for symmetry control and direct-current limiting, and a symmetrical control device.
37 Citations
15 Claims
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1. An electronic voice circuit configuration, comprising:
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first and second line terminals to be connected to a telephone line; a calling part connected to said line terminals; a modulator circuit having an input side connected to said line terminals and having an output side; first, second and third nodes connected to said output side of said modulator circuit; a transmitting device connected to said modulator circuit for transmitting signals; a receiving device connected to said modulator circuit for receiving signals; an equipment impedance device having an input side coupled through said first, second and third nodes to said modulator circuit and having an output side; fourth, fifth and sixth nodes connected to said output side of said equipment impedance device; and a control device connected through said fourth, fifth and sixth nodes to said output side of said equipment impedance device; said first and fourth nodes and said first line terminal carrying potentials forming a positive line path, and said second and fifth nodes and said second line terminal carrying potentials forming a negative line path; said third node carrying a first mid-potential and said sixth node carrying a second mid-potential; and the potentials at said first and second nodes being symmetrical with respect to the first mid-potential, and the potentials at said fourth and fifth nodes being symmetrical with respect to the second mid-potential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification