Systems and methods for determining non-linear precoding coefficients are disclosed. In some embodiments, a method of determining non-linear precoding coefficients for transmitting at least one frequency tone on lines includes obtaining a channel matrix that relates an input of the lines to an output of the lines for the at least one frequency tone. The method also includes computing a metric for each line in a subset of the lines and determining a line order for the subset of the lines based on the metric for each line in the subset of the lines. The method also includes reordering elements of the channel matrix based on the line order for the subset of the lines to create a reordered channel matrix and determining the non-linear precoding coefficients based on the reordered channel matrix. This may provide a systematic way to sort lines and balance the bit rates between different lines.

A computer-implemented method to detect and reduce feedback in an audio signal is disclosed. The method may include obtaining an audio signal. The method may further include separating the audio signal into a plurality of frequency bands. The method may also include, for each frequency band of the plurality of frequency bands, determining whether the frequency band includes feedback. The method may further include, for each frequency band determined to include feedback, attenuating the frequency band. The method may also include combining each frequency band of the plurality of frequency bands to produce an output audio signal.

A computer-implemented method to detect and reduce feedback in an audio signal is disclosed. The method may include obtaining an audio signal. The method may further include separating the audio signal into a plurality of frequency bands. The method may also include, for each frequency band of the plurality of frequency bands, determining whether the frequency band includes feedback. The method may further include, for each frequency band determined to include feedback, attenuating the frequency band. The method may also include combining each frequency band of the plurality of frequency bands to produce an output audio signal.

A matching circuit in a communication apparatus may comprise a first inductor disposed at a primary side of a transformer; a second inductor disposed at a secondary side of the transformer; and an impedance element connected to the first inductor and the second inductor. Also, a first terminal of the first inductor may be connected to an input terminal of the transformer, a second terminal of the first inductor may be connected to a common node connected to a ground, a first terminal of the second inductor may be connected to an output terminal of the transformer, a second terminal of the second inductor may be connected to the common node, a first terminal of the impedance element may be connected to the common node, and a second terminal of the impedance element may be connected to the ground.

Embodiments relate to a method for detecting a broken binder in an access network including a plurality of telecommunication lines grouped in respective binders, executed by a detection device, including identifying a plurality of telecommunication lines for which a transmission interruption has been detected within a given time period obtaining line data associated with the respective identified telecommunication lines, for respective pairs of identified telecommunication lines, determining a virtual distance between the two telecommunication lines, in function of the associated line data, determining at least one cluster of telecommunication lines in function of the virtual distances, and detecting a broken binder in function of the determined at least one cluster.

A communication module includes a power amplifier that amplifies a transmission signal having a first communication system or a second communication system and outputs an amplified signal to a signal path, a switch circuit that switches between a signal path for the first communication system and a signal path for the second communication system and outputs the amplified signal to one of the signal paths for the first communication system and the second communication system in accordance with a control signal supplied in accordance with the communication system of the transmission signal, and an impedance-matching network disposed between the power amplifier and the switch circuit, the impedance-matching network including a first variable capacitance element. The first variable capacitance element has a capacitance value that is controlled in accordance with the communication system of the transmission signal.

A computer-implemented method to detect and reduce feedback in an audio signal is disclosed. The method may include obtaining an audio signal. The method may further include separating the audio signal into a plurality of frequency bands. The method may also include, for each frequency band of the plurality of frequency bands, determining whether the frequency band includes feedback. The method may further include, for each frequency band determined to include feedback, attenuating the frequency band. The method may also include combining each frequency band of the plurality of frequency bands to produce an output audio signal.

A computer-implemented method to detect and reduce feedback in an audio signal is disclosed. The method may include obtaining an audio signal. The method may further include separating the audio signal into a plurality of frequency bands. The method may also include, for each frequency band of the plurality of frequency bands, determining whether the frequency band includes feedback. The method may further include, for each frequency band determined to include feedback, attenuating the frequency band. The method may also include combining each frequency band of the plurality of frequency bands to produce an output audio signal.

A communication device includes: a signal generator configured to generate a first signal and supply the first signal to a telephone line; a terminator having a variable terminal impedance as seen from the telephone line; a detector configured to detect a difference between the terminal impedance and a line impedance of the telephone line; and a controller configured to determine the terminal impedance so that the difference is reduced.

A communication device includes: a signal generator configured to generate a first signal and supply the first signal to a telephone line; a terminator having a variable terminal impedance as seen from the telephone line; a detector configured to detect a difference between the terminal impedance and a line impedance of the telephone line; and a controller configured to determine the terminal impedance so that the difference is reduced.