System and method for supressing pulse dialing feedback occurring particularly with auxiliary acoustic ringers in socket telephone systems
First Claim
Patent Images
1. An acoustic feedback suppression system in a socket telephone system comprising:
- a first and a second terminal to respectively couple to first and second telephone lines;
an internal ringer;
an auxiliary ringer connected between the first and the second telephone terminals;
first switching means for reducing a voltage across the auxiliary ringer;
second switching means for reducing a voltage across the auxiliary ringer;
activation means for activating the first and second switching means to reduce a voltage across the auxiliary ringer, the activation means being controlled by an activation signal generated by control and signaling means when a user dials a telephone number.
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Abstract
An acoustic feedback suppression system, particularly for auxiliary ringers in socket telephone systems, comprising a first terminal and a second terminal of a telephone line, an internal ringer, and an auxiliary ringer that is connected between the first and second telephone lines. The system comprises an activation circuit adapted to activate first and second switching circuits to reduce the voltage at the terminals of the auxiliary ringer, the activation circuit being controlled by an activation signal generated by a control and signaling circuit when a user dials a telephone number.
57 Citations
51 Claims
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1. An acoustic feedback suppression system in a socket telephone system comprising:
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a first and a second terminal to respectively couple to first and second telephone lines; an internal ringer; an auxiliary ringer connected between the first and the second telephone terminals; first switching means for reducing a voltage across the auxiliary ringer; second switching means for reducing a voltage across the auxiliary ringer; activation means for activating the first and second switching means to reduce a voltage across the auxiliary ringer, the activation means being controlled by an activation signal generated by control and signaling means when a user dials a telephone number.
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2. An acoustic feedback suppression system in a socket telephone system comprising:
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a first and a second terminal to respectively couple to first and second telephone lines; an internal ringer; an auxiliary ringer connected between the first and the second telephone terminals; first switching means for reducing a voltage across the auxiliary ringer; second switching means for reducing a voltage across the auxiliary ringer; activation means for activating the first and second switching means to reduce a voltage across the auxiliary ringer, the activation means being controlled by an activation signal generated by control and signaling means when a user dials a telephone number; a first rectifier bridge coupled to the first and second terminals; and a switch disposed between the control and signaling means and the first rectifier bridge. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 50, 51)
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3. An acoustic feedback suppression system in a socket telephone system comprising:
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a first and a second terminal to respectively couple to first and second telephone lines; an internal ringer; an auxiliary ringer connected between the first and the second telephone terminals; first switching means for reducing a voltage across the auxiliary ringer; second switching means for reducing a voltage across the auxiliary ringer; activation means for activating the first and second switching means to reduce a voltage across the auxiliary ringer, the activation means being controlled by an activation signal generated by control and signaling means when a user dials a telephone number; wherein the activation means includes first and second current sources that can be activated by the activation signal originating from the control and signaling means.
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11. An acoustic feedback suppression system in a socket telephone system comprising:
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a first and a second terminal to respectively couple to first and second telephone lines; an internal ringer; an auxiliary ringer connected between the first and the second telephone terminals; first switching means for reducing a voltage across the auxiliary ringer; second switching means for reducing a voltage across the auxiliary ringer; activation means for activating the first and second switching means to reduce a voltage across the auxiliary ringer, the activation means being controlled by an activation signal generated by control and signaling means when a user dials a telephone number; wherein the control and signaling means includes a microprocessor configured to generate said activation signal.
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12. In a socket telephone system having first and second terminals for respectively coupling to first and second telephone lines, and an auxiliary ringer having first and second inputs coupled to the first and second terminals, a feedback suppression circuit for suppressing a voltage across the auxiliary ringer comprising:
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a first input to couple to the first input of the auxiliary ringer; a second input to couple to the second input of the auxiliary ringer; a third input that receives an activation signal; and a switching circuit, activated by the activation signal, that couples the first input of the feedback suppression circuit to the second input of the feedback suppression circuit to suppress a voltage across the auxiliary ringer, the switching circuit including first and second switches each having a control input and first and second terminals, the first and the second terminals of the first switch being coupled in a first current path between the first and the second inputs of the suppression circuit, and the first and the second terminals of the second switch being coupled in a second current path between the first and the second inputs of the suppression circuit. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method for suppressing a voltage across an auxiliary ringer in a socket telephone system having first and second terminals for respectively coupling to first and second telephone lines, the auxiliary ringer having first and second inputs coupled to the first and second terminals of the socket telephone system, the method including steps of:
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closing a first switch in response to a detection of a first voltage condition at one of the inputs of the auxiliary ringer to provide a current path for current from the first voltage condition; and closing a second switch in response to a detection of a second voltage condition at the other of the inputs of the auxiliary ringer to provide a current path for current from the second voltage condition. - View Dependent Claims (21, 22, 23, 24, 46, 47)
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25. In a socket telephone system having first and second terminals for respectively coupling to first and second telephone lines, and an auxiliary ringer having first and second inputs coupled to the first and second terminals, a feedback suppression circuit comprising:
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a first input to couple to the first input of the auxiliary ringer; a second input to couple to the second input of the auxiliary ringer; a third input that receives an activation signal; and first switching means, activated by the activation signal, for coupling the first input of the auxiliary ringer to the second input of the auxiliary ringer through a first current path to suppress a voltage of a first polarity across the auxiliary ringer; second switching means, activated by the activation signal, for coupling the first input of the auxiliary ringer to the second input of the auxiliary ringer through a second current path to suppress a voltage of a second polarity across the auxiliary ringer. - View Dependent Claims (26, 27, 28)
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29. A socket telephone system comprising:
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first and second terminals for respectively coupling to first and second telephone lines; an auxiliary ringer having first and second inputs coupled to the first and second terminals; and a feedback suppression circuit including; a first input coupled to the first input of the auxiliary ringer; a second input coupled to the second input of the auxiliary ringer; a third input that receives an activation signal; and a switching circuit, activated by the activation signal, that couples the first input of the feedback suppression circuit to the second input of the feedback suppression circuit to suppress a voltage across the auxiliary ringer, the switching circuit including first and second switches each having a control input and first and second terminals, the first and the second terminals of the first switch being coupled in a first current path between the first and the second inputs of the suppression circuit, and the first and the second terminals of the second switch being coupled in a second current path between the first and the second inputs of the suppression circuit. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A method for suppressing a voltage across an auxiliary ringer in a socket telephone system having first and second terminals for respectively coupling to first and second telephone lines, the auxiliary ringer having first and second inputs coupled to the first and second terminals of the socket telephone system, the method including steps of:
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providing a current path between the first and second terminals of the auxiliary ringer, wherein the current path includes first and second oppositely connected diodes; bypassing the first diode in response to a detection of a first voltage condition; and bypassing the second diode in response to a detection of a second voltage condition. - View Dependent Claims (42, 43, 44, 45, 48, 49)
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Specification