Terminal for wirebound telecommunication
AssigneeU.S. Philips Corporation
InventorHenk Derks
Life of this patent
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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 (V.sub.ring) coming from the line (2) in a ringing condition and, in an off-hook condition, is supplied with the line voltage (V.sub.ln) 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 (V.sub.ring) and the line voltage (V.sub.ln) can plainly be used as a supply voltage for the amplifier (20) and no additional circuits are necessary for matching these voltages.
Claims4
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.
Dependencies are inferred from the claim text.