The present disclosure discloses an Ethernet-based cascading conference phone device, which includes a master conference phone and a slave conference phone. The master conference phone receives at least one network data packet through an Ethernet, obtains a real-time stream signal according to the at least one network data packet, plays the real-time stream signal after a delay, sends the real-time stream signal to the slave conference phone, periodically sends at least one synchronized broadcast packet to the slave conference phone. The slave conference phone receives the at least one synchronized broadcast packet, receives the real-time stream signal, calculates a master-slave clock offset according to the at least one synchronized broadcast packet, performs linear compensation on the real-time stream signal according to the master-slave clock offset to obtain a compensation real-time stream signal, plays the compensation real-time stream signal and sends the real-time stream signal to the master conference phone.

A circuit includes signal conditioner circuitry, level shifter circuitry, and state detector and controller circuitry coupled between the signal conditioner circuitry and the level shifter circuitry. The state detector and controller circuitry includes receiver circuitry and a finite state machine coupled to the receiver circuitry. The finite state machine is configured to detect a first data rate from signals, control operation of the signal conditioner circuitry responsive to detecting the first data rate, and control operation of the level shifter circuitry during a second data rate.

An electronic device includes processing circuitry outputting first to third signals, delaying first to third signals to output fourth to sixth signals, generating a pulse signal based on the fourth signal, the fifth signal, and the sixth signal, detecting lengths of intervals, and adjusting at least one of a first code, a second code, and a third code based on fourth codes.

The controller includes a first equalizer, a first detector, a second detector, a multiplexer, a data clock generator, and a second equalizer. The first equalizer is configured to receive and equalize the input data. The first detector is configured to detect optimum phase of the input data. The optimum phase of the input data represents the input data peak. The second detector is configured to generate an envelope data according to the input data and detect peak of envelop with respect to sampling phase. The data clock generator is configured to generate the recovered data clock. The second equalizer is configured to generate the recovered data. The multiplexer is configured to generate an offset value according to the input data peak and the envelope data peak. The offset value represents the recovered data clock having an optimum sampling frequency and an optimum sampling phase.

Aspects of the disclosure provide a receiver for receiving data over a wired communication channel. The receiver includes an analog front end circuit, a pulse generation circuit and a voltage-controlled oscillator (VCO). The analog front end circuit receives an analog signal carrying data over the wired communication channel, and outputs a data signal with data bit transitions between voltage levels. The pulse generation circuit generates a pulse signal in response to the data bit transitions in the data signal. The voltage-controlled oscillator (VCO) generates an oscillation signal for providing sampling clocks for the data signal. The voltage-controlled oscillator aligns transitions in the oscillation signal to the pulse signal by forcing the oscillation signal to transit voltage levels in response to a pulse in the pulse signal.

Certain aspects of the present disclosure provide an apparatus for wireless communication. The apparatus generally includes a plurality of slave radio frequency (RF) devices, a master RF device configured to set a configuration parameter in a register to be applied by an RF slave device of the plurality of RF slave devices, and a clock line coupled between the master RF device and the plurality of slave RF devices. The slave RF device may be configured to: count a number of cycles of a clock signal on the clock line; and apply the configuration parameter for the slave RF device based on the count of the number of cycles, wherein the master RF device is further configured to disable an interrupt reporting function of the plurality of slave RF device during a time period between setting the configuration parameter in the register and the configuration parameter being applied.

A high-speed interface apparatus and method of correcting skew in the apparatus are provided. A high-speed transmitter includes a transmission D-PHY module that generates and transmits a clock signal through a clock channel, generates a deskew synchronous code and test data in response to a deskew request signal, transmits the deskew synchronous code followed by the test data through a data channel, and transmits a normal synchronous code followed by normal data through the data channel in normal mode.

A code acquisition module for a direct sequence spread spectrum (DSSS) receiver includes: a Sparse Discrete Fourier transform (SDFT) module configured to perform an SDFT on a finite number of non-uniformly distributed frequencies comprising a preamble of a received DSSS frame to calculate Fourier coefficients for the finite number of non-uniformly distributed frequencies; a multiplier configured to multiply the Fourier coefficients for the finite number of non-uniformly distributed frequencies of the received DSSS frame by complex conjugate Fourier coefficients for the finite number of non-uniformly distributed frequencies to generate a cross-correlation of the received DSSS frame and the complex conjugate Fourier coefficients; and a filter module configured to input the cross-correlation and output a delay estimation for the received DSSS frame.

A device with wireless communication includes: an input receiver configured to receive an input signal having a carrier frequency; a delay circuit configured to generate a delayed signal by delaying the input signal; and a clock generator configured to generate a clock signal having a clock frequency based on the delayed signal and the input signal.

An example method of clock and data recovery (CDR) includes adding a pre-defined offset to an output of a phase detector (PD) of a CDR circuit, and loading an accumulator of a frequency loop of the CDR circuit with a pre-defined load value. The method further includes detecting the phase of an incoming signal using a PD, and determining that the CDR has locked onto a real lock point. In some examples, the method further includes determining that the CDR has locked on a real lock point, and, in response to the determination, modifying the pre-defined offset to equal zero.