Terminal for wirebound telecommunication
First Claim
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1. Terminal for wirebound telecommunication, comprising;
- a class D amplifier to be powered by a voltage on a telecommunication line to which the terminal is connectable and on which a ringing condition is indicated by an AC ringing voltage and on which a DC line voltage is applied during an off hook condition;
rectifier means for rectifying the AC ringing voltage; and
switching means having a first input to which the rectified AC ringing voltage is coupled when the ringing condition occurs, having a second input to which the DC line voltage is coupled when the off hook condition occurs, and having an output coupled to a power supply input of the class D amplifier;
the switching means switching its first input to the power supply input of the class D amplifier when the ringing condition occurs, and switching its second input to the power supply input of the class D amplifier when the off hook condition occurs.
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Abstract
A terminal (1) for wirebound telecommunication according to the invention comprises a class D amplifier which is supplied with a rectified ringing voltage (Vring) coming from the line (2) in a ringing condition and, in an off-hook condition, is supplied with the line voltage (Vln) coming from the line (2). A class D amplifier (20) is advantageous in that it is suitable for use with supply voltages which may vary over a large range. As a result, both the rectified ringing voltage (Vring) and the line voltage (Vln) can plainly be used as a supply voltage for the amplifier (20) and no additional circuits are necessary for matching these voltages.
8 Citations
4 Claims
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1. Terminal for wirebound telecommunication, comprising;
- a class D amplifier to be powered by a voltage on a telecommunication line to which the terminal is connectable and on which a ringing condition is indicated by an AC ringing voltage and on which a DC line voltage is applied during an off hook condition;
rectifier means for rectifying the AC ringing voltage; and
switching means having a first input to which the rectified AC ringing voltage is coupled when the ringing condition occurs, having a second input to which the DC line voltage is coupled when the off hook condition occurs, and having an output coupled to a power supply input of the class D amplifier;the switching means switching its first input to the power supply input of the class D amplifier when the ringing condition occurs, and switching its second input to the power supply input of the class D amplifier when the off hook condition occurs. - View Dependent Claims (2, 3, 4)
- a class D amplifier to be powered by a voltage on a telecommunication line to which the terminal is connectable and on which a ringing condition is indicated by an AC ringing voltage and on which a DC line voltage is applied during an off hook condition;
Specification
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Current AssigneeST-Ericcson SA (Telefonaktiebolaget LM Ericsson)
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Original AssigneeUS Philips Corporation (Koninklijke Philips N.V.)
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InventorsDerks, Henk
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Primary Examiner(s)Hunter, Daniels S.
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Assistant Examiner(s)APPIAH, CHARLES NANA
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Application NumberUS08/753,555Time in Patent Office742 DaysField of Search379/377, 379/387, 379/382, 379/418, 379/413, 379/275, 379/375, 379/164, 379/424, 379/388, 379/389, 379/390US Class Current379/390.01CPC Class CodesH04M 1/6033 for providing handsfree use...H04M 19/08 with current supply sources...
