US 9,312,912 B2 · Signal transmitting and receiving circuit of digital subscriber line

Abstract

This invention discloses a signal transmitting and receiving circuit of a digital subscriber line used for transmitting an output signal to a telecommunication loop or receiving an input signal from the telecommunication loop. The signal transmitting and receiving circuit comprises a transformer, which is coupled to the telecommunication loop; a signal transmitting module, which is coupled to the transformer, for generating the output signal; a signal receiving module, which is coupled to the transformer, for processing the input signal; an echo cancelling circuit, comprising passive components and having two ends, one of which is coupled to the signal transmitting module and the transformer, the other is coupled to the signal receiving module and the transformer. The output signal is transmitted to the telecommunication loop via the electromagnetic coupling of the transformer, and the input signal is received by the signal receiving module by the electromagnetic coupling of the transformer.

Claims19

Dependent claims

A signal transmitting and receiving circuit of a digital subscriber line for transmitting an output signal to a telecommunication loop or receiving an input signal from the telecommunication loop, comprising:

a transformer comprising a first winding, a second winding, and a third winding, the first winding comprising a first coil and a second coil, the third winding coupled to the telecommunication loop and the first and the second coils comprising respectively a first polarity end and a second polarity end;
a first impedance unit comprising two ends coupled respectively to the first polarity end of the first coil and the first polarity end of the second coil;
a second impedance unit comprising two ends coupled respectively to the second polarity end of the first coil and the second polarity end of the second coil;
a signal transmitting module, coupled to the first winding, for generating the output signal;
and
a signal receiving module, coupled to the second winding, for processing the input signal;
wherein, the first winding and the third winding transmit the output signal to the telecommunication loop by electromagnetic coupling, and the third winding and the second winding transmits the input signal to the signal receiving module by electromagnetic coupling.

4 more elements

a transformer coupled to the telecommunication loop;
a signal transmitting module, coupled to the transformer, for generating the output signal;
a signal receiving module, coupled to the transformer, for processing the input signal;
and
an echo cancelling circuit made of passive components and comprising two ends, one of which is coupled to the signal transmitting module and the transformer, and the other is coupled to the signal receiving module and the transformer;
wherein, the output signal is transmitted to the telecommunication loop by electromagnetic coupling of the transformer, and the input signal is transmitted to the signal receiving module by electromagnetic coupling of the transformer, and the echo cancelling circuit comprises at least a resistance component, a capacitance component, and a switching component, and the switching component controls whether the equivalent impedance of the echo cancelling circuit comprises the capacitance component or not.

3 more elements

a transformer coupled to the telecommunication loop;
a signal transmitting module, coupled to the transformer and comprising a transmitting differential signal pair, for generating the output signal;
a signal receiving module, coupled to the transformer and comprising a receiving differential signal pair, for processing the input signal;
and
an echo cancelling circuit made of passive components and having one of its two ends coupled to the signal transmitting module and the transformer, and the other end coupled to the signal receiving module and the transformer, comprising:
a first impedance unit with one of its two ends coupled to a positive end of the transmitting differential signal pair and the transformer and the other end coupled to a negative end of the receiving differential signal pair and the transformer;
and
a second impedance unit with one of its two ends coupled to a negative end of the transmitting differential signal pair and the transformer and the other end coupled to a positive end of the receiving differential signal pair and the transformer;
wherein, the output signal is transmitted to the telecommunication loop by electromagnetic coupling of the transformer, and the input signal is transmitted to the signal receiving module by electromagnetic coupling of the transformer.

6 more elements

Dependencies are inferred from the claim text.

Signal transmitting and receiving circuit of digital subscriber line

Life of this patent

Signal transmitting and receiving circuit of digital subscriber line

Life of this patent

Abstract

Claims19