Receiving arrangements for audio frequency signals
First Claim
1. A receiver circuit for decoupling audio frequency signals from an alternating current distribution network, said signals being in a frequency range whose lowest most value is fc, said network including at least a first transformer comprising primary and secondary windings, said receiver being coupled to said network by way of a primary winding of a second transformer, said primary winding of said second transformer being coupled to the secondary winding of said first transformer,said receiver comprising(a) a secondary winding of said second transformer, said secondary winding of said second transformer having an inductance and an ohmic resistance;
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Abstract
A receiving arrangement is provided, to receive audio frequency signals that are transmitted by way of lines of an alternating current distribution network. The audio frequency signals are decoupled from a low or medium voltage level of the network. The currents in one or more phases in such level are detected and the signal is applied to a receiver. The audio frequency signals are decoupled by means of one or more current transformers or voltage transformers and currents or voltages in secondary windings of signal transformers connected thereto are detected. Each secondary winding of the signal transformers with the ohmic resistance thereof and the load resistance thereof, forms a high-pass filter with the lowest frequency to be transmitted as its lowermost frequency. The signal transformer cooperates with an amplifier, summing or subtracting circuit in the receiving circuit.
75 Citations
11 Claims
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1. A receiver circuit for decoupling audio frequency signals from an alternating current distribution network, said signals being in a frequency range whose lowest most value is fc, said network including at least a first transformer comprising primary and secondary windings, said receiver being coupled to said network by way of a primary winding of a second transformer, said primary winding of said second transformer being coupled to the secondary winding of said first transformer,
said receiver comprising (a) a secondary winding of said second transformer, said secondary winding of said second transformer having an inductance and an ohmic resistance; - and
(b) a load resistance connected to said secondary winding of said second transformer, said ohmic resistance, said inductance, and said load resistance being adapted to form a high pass filter capable of passing frequencies in said range including said lowest most frequency fc. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification