Abstract: A frequency modulation demodulation device and a control method thereof are provided. The frequency modulation demodulation device includes an input terminal, a phase converter, a phase-locked loop circuit, and a frequency offset/shift detector. The phase converter receives an input signal to obtain a phase signal. The phase-locked loop circuit generates a phase adjustment signal according to the phase signal and adjusts the phase signal according to the phase adjustment signal to perform demodulation of the input signal. The phase-locked loop circuit performs signal alignment and signal compensation on the phase signal to generate a filtered phase signal. The phase adjustment signal provides a feedback of and adjusts the phase signal. The frequency offset/shift detector generates a frequency offset/shift determining signal according to the phase adjustment signal. The frequency offset/shift determining signal is related to a phase frequency offset/shift of the input signal.

Abstract: A frequency modulation demodulation device and a control method thereof are provided. The frequency modulation demodulation device includes an input terminal, a phase converter, a phase-locked loop circuit, and a frequency offset/shift detector. The input terminal receives an input signal. The phase converter is coupled to the input terminal and receives the input signal to obtain a phase signal. The phase-locked loop circuit is coupled to the phase converter to generate a phase adjustment signal according to the phase signal, and the phase-locked loop circuit adjusts the phase signal according to the phase adjustment signal to perform demodulation of the input signal. The frequency offset/shift detector is coupled to the phase-locked loop circuit and generates a frequency offset/shift determining signal according to the phase adjustment signal obtained from the phase-locked loop circuit. The frequency offset/shift determining signal is related to a phase frequency offset/shift of the input signal.

Abstract: A bidirectional communication method between a master terminal and a slave terminal on a single transmission line includes the master terminal transmitting an initial message, a slave number and a master acknowledgement signal. After acknowledgement of the slave terminal, the master terminal transmits an address of the slave terminal and a master acknowledgement signal. After acknowledgement of the slave terminal, the master terminal transmits data and a master acknowledgement signal. After acknowledgement of the slave terminal, the master terminal transmits a master No-acknowledgement signal. And the slave terminal transmits a slave acknowledgement signal.

Abstract: A bidirectional communication method between a master terminal and a slave terminal on a single transmission line includes the master terminal transmitting an initial message, a slave number and a master acknowledgement signal. After acknowledgement of the slave terminal, the master terminal transmits an address of the slave terminal and a master acknowledgement signal. After acknowledgement of the slave terminal, the master terminal transmits data and a master acknowledgement signal. After acknowledgement of the slave terminal, the master terminal transmits a master No-acknowledgement signal. And the slave terminal transmits a slave acknowledgement signal.