Abstract: A noise elimination device for a Class-D audio amplifier includes a residual signal detector and a multiplexer, wherein the multiplexer is electrically connected with a sigma-delta modulator (SDM) and a pulse width modulator (PWM) of the Class-D audio amplifier and the residual signal detector. The residual signal detector is configured to detect whether an input signal of the Class-D audio amplifier is residual. The multiplexer is configured to output zero data into the pulse width modulator when the residual signal detector detects that the input signal of the Class-D audio amplifier is residual.

Abstract: Methods and systems are provided for facilitating time zone prediction using electronic communication data. Electronic message data associated with a message recipient of electronic communications is obtained. The electronic message data includes message delivery data associated with an electronic message and message response data associated with a response, by the message recipient, to a received electronic message. Using a machine learning model and based on the message delivery data and the message response data, a time-zone score is determined for a time zone. Such a time-zone score can indicate a probability the time zone corresponds with the message recipient. Based on the time-zone score, the time zone is identified as corresponding with the message recipient.

Abstract: Methods and systems are provided for facilitating time zone prediction using electronic communication data. Electronic message data associated with a message recipient of electronic communications is obtained. The electronic message data includes message delivery data associated with an electronic message and message response data associated with a response, by the message recipient, to a received electronic message. Using a machine learning model and based on the message delivery data and the message response data, a time-zone score is determined for a time zone. Such a time-zone score can indicate a probability the time zone corresponds with the message recipient. Based on the time-zone score, the time zone is identified as corresponding with the message recipient.

Abstract: In implementations of systems for estimating temporal occurrence of a binary state change, a computing device implements an occurrence system to compute a posterior probability distribution for temporal occurrences of binary state changes associated with client computing devices included in a group of client computing devices. The occurrence system determines probabilities of a binary state change associated with a client computing device included in the group of client computing devices based on the posterior probability distribution, and the probabilities correspond to future periods of time. A future period of time is identified based on a probability of the binary state change associated with the client computing device. The occurrence system generates a communication based on a communications protocol for transmission to the client computing device via a network at a period of time that correspond to the future period of time.

Abstract: An apparatus for noise reduction in audio signal processing includes a power amplifier, a zero-crossing detector, and a threshold detector. The power amplifier has an input signal terminal for receiving an audio input signal and an output signal terminal. The audio input signal is a digital-to-analog converted version according to a version of a digital audio signal. The power amplifier has an analog gain which is controllable in response to an analog gain control signal. The zero-crossing detector determines a zero-crossing detection signal according to an internal signal provided between the input signal terminal and the output signal terminal. The threshold detector determines a gain setting according to the digital audio signal and the zero-crossing detection signal to generate the analog gain control signal indicating the gain setting, wherein the threshold detector controls the analog gain of the power amplifier according to the analog gain control signal.

Abstract: An apparatus for noise reduction in audio signal processing includes a power amplifier, a zero-crossing detector, and a threshold detector. The power amplifier has an input signal terminal for receiving an audio input signal and an output signal terminal. The audio input signal is a digital-to-analog converted version according to a version of a digital audio signal. The power amplifier has an analog gain which is controllable in response to an analog gain control signal. The zero-crossing detector determines a zero-crossing detection signal according to an internal signal provided between the input signal terminal and the output signal terminal. The threshold detector determines a gain setting according to the digital audio signal and the zero-crossing detection signal to generate the analog gain control signal indicating the gain setting, wherein the threshold detector controls the analog gain of the power amplifier according to the analog gain control signal.

Abstract: Methods and systems are provided for facilitating time zone prediction using electronic communication data. Electronic message data associated with a message recipient of electronic communications is obtained. The electronic message data includes message delivery data associated with an electronic message and message response data associated with a response, by the message recipient, to a received electronic message. Using a machine learning model and based on the message delivery data and the message response data, a time-zone score is determined for a time zone. Such a time-zone score can indicate a probability the time zone corresponds with the message recipient. Based on the time-zone score, the time zone is identified as corresponding with the message recipient.

Abstract: A direct current (DC) offset protection circuit includes: a DC offset detection circuit and a control circuit. The DC offset detection circuit is arranged to detect whether a DC component exists in pulse-width-modulation (PWM) signals and accordingly generate a DC offset detection result. The control circuit is arranged to control an audio system according to the DC offset detection result. The DC offset detection circuit comprises a PWM polarity judgment circuit, a cascaded integrator-comb (CIC) filter and a DC offset judgment circuit. The PWM polarity judgment circuit is arranged to judge a polarity of complementary PWM signals and accordingly generate a polarity indication value. The CIC filter is arranged to generate a filter output signal by averaging a plurality of polarity indication values. The DC offset judgment circuit is arranged to generate the DC offset detection result by comparing the filter output signal with a predetermined DC threshold.