A light-emitting unit outputs an optical signal corresponding to an input electric signal. A light-receiving unit is electrically insulated from the light-emitting unit and outputs an electric signal according to the received optical signal as an output signal. In the light-receiving unit, a first light-receiving device outputs an optical current according to the optical signal. A second light-receiving device is provided not to receive the optical signal. A current duplication circuit duplicates a current flowing through the second light-receiving device. A current-voltage conversion circuit converts a current, which is generated by subtracting the current duplicated by the current duplication circuit from a current flowing through the first light-receiving device, into a voltage signal. A comparator output a result of a comparison between the voltage signal converted by the current-voltage conversion circuit and a threshold voltage as the output signal.

There is provided a base station including a memory, a processor coupled to the memory and the processor configured to generate a distortion-compensated transmission signal, and a plurality of transmitters, a transmitter of the plurality of transmitters configured to include a first amplifier configured to amplify the distortion-compensated transmission signal so as to transmit the distortion-compensated transmission signal, and an attenuator configured to attenuate a feedback signal generated by splitting the distortion-compensated transmission signal amplified by the first amplifier so as to feed back the feedback signal to the processor, wherein the processor is further configured to perform distortion compensation according to a distortion compensation coefficient based on a power of the feedback signal.

A surface acoustic wave (SAW) filter that receives an aggregate circuit and outputs two or more sub-signals on outputs each of a different frequency band. The sub-signals are amplified by low noise amplifiers and, in one implementation, the amplified sub-signals can be summed. The outputs are connected via a switched passive network so that portions of the sub-signals on the outputs that are not in the selected frequency band are at least partially terminated.

A system and/or method is provided for enhanced listening of audio signals acquired via a telecoil by performing hum filtering. The system may include a telecoil and a telecoil hum filter. The telecoil hum filter may include a comb notch filter. The comb notch filter may include a delay module and a comb notch filter summing module. The telecoil may be operable to receive a magnetic signal and convert the magnetic signal to an input audio signal. The delay module of the comb notch filter may be configured to generate a delayed signal by applying a delay to the input audio signal. The delay may be based on a fundamental hum frequency. The comb notch filter summing module may be configured to generate a comb notch filter output signal by adding the input audio signal and the delay signal.

The present disclosure provides a communication system. The communication system includes a radio wave receiver; a transmission node that transmits data; and a reception node that receives the data from the transmission node. The transmission node changes a transmission rate of the data so that a notch point at which a spectrum of a communication waveform decreases overlaps with a frequency selected by the radio wave receiver.

A device to cancel noise in broadcast signal is disclosed. The device a first port to connect to a main antenna, a second port to connect to a noise antenna, a processor coupled to the first port and the second port to measure the broadcast signal received at the first port and a noise signal received at the second port to derive a first set of coefficients, a first adaptive filter coupled to the first port and the processor and a second adaptive filter coupled to the second port and the processor. The first adaptive filter and the second adaptive filters are configurable based on the first set of coefficients to remove the high energy parts of a frequency spectrum of signals received at the first port and the second ports respectively. The device also includes a subtraction coefficient calculator module coupled to the first filter and the second filter to derive a second set of coefficients and a subtractor coupled to the first port, the second port and the subtraction coefficient calculator module to subtract the noise signal from the broadcast signal.

An integrated circuit is described herein. According to one or more embodiments, the integrated circuit includes a local oscillator with a voltage-controlled oscillator (VCO) that generates a local oscillator signal. Further, the integrated circuit includes a frequency divider coupled to the VCO downstream thereof. The frequency divider provides a frequency-divided local oscillator signal by reducing the frequency of the local oscillator signal by a constant factor. A first test pad of the integrated circuit is configured to receive a reference oscillator signal. Further, the integrated circuit includes a first mixer that receives the reference oscillator signal and the frequency-divided local oscillator signal to down-convert the frequency-divided local oscillator signal.

A transceiving circuit, which comprises: a transmitting circuit, configured to transmit a test signal; a receiving circuit, comprising a mixer configured to receive a plurality of predetermined DC bias voltage groups, wherein the receiving circuit generates a plurality of output signals according to the test signal while the mixer operates at the predetermined DC bias voltage groups; a frequency domain analyzing circuit, configured to transform the output signals to a plurality of frequency domain signals; and a DC bias voltage generating circuit, configured to generate a function according to the frequency domain signals and the predetermined bias voltage groups, and configured to generate a first DC bias voltage group to the mixer according to the function.

The transmit power level of a transceiver coupled to a digital subscriber line (DSL) line is reduced from a first transmit power level sufficient for the transceiver to continuously transmit data on the DSL line at a first bit rate to a second transmit power level below the first transmit power level sufficient for the transceiver to continuously transmit data on the DSL line at a second bit rate that is lower than the first bit rate. The reduction in transmit power is limited so that the change does not induce time-varying crosstalk sufficient to destabilize a nearby DSL line. While the transmit power level of the transceiver is reduced to the second transmit power level, the transceiver is suspended from transmitting data on the DSL line for repeated periods of time. Suspending the data transmission is controlled to avoid further time-varying crosstalk sufficient to destabilize the nearby DSL line.

An integrated circuit package includes a portion of a lead frame disposed within an encapsulation. The lead frame includes a first conductor including a first conductive loop and a third conductive loop disposed substantially within the encapsulation. A second conductor formed in the lead frame is galvanically isolated from the first conductor and includes a second conductive loop disposed substantially within the encapsulation proximate to the first conductive loop to provide a communication link between the first and second conductors. The third conductive loop is wound in an opposite direction relative to the first conductive loop. A transmit circuit is disposed within the encapsulation and is coupled to the second conductor to provide a transmitter current. A receive circuit is disposed within the encapsulation and is coupled to the first conductor to receive a transmitter induced signal in response to the transmitter current.