Abstract: A portable monitoring device, including a housing, a physiological parameter acquiring circuit, a signal transmitting circuit, and a signal receiving circuit, is provided. The physiological parameter acquiring circuit is configured to acquire physiological sign parameters of a monitoring object; the signal transmitting circuit is configured to determine a transmitting frequency of a communication signal according to the current communication state, and transmit the physiological sign parameters to a wireless access point by means of the communication signal of the transmitting frequency; the signal receiving circuit is configured to receive the communication signal transmitted by the wireless access point, and perform filter processing on the communication signal of the current communication channel to suppress interference signals from other communication signals.

Abstract: This disclosure provides a monitoring device, a wireless communication device, and a control method. The monitoring device includes a control system assembly, a digital-analog mixing assembly, a frequency band selection assembly, and an antenna. The control system assembly is respectively connected with the digital-analog mixing assembly and the frequency band selection assembly; one end of the frequency band selection assembly is connected with the digital-analog mixing assembly through a channel of designated frequency band, and the other end of the frequency band selection assembly is connected with the antenna. The monitoring device can switch from a currently used frequency band to other frequency bands for signal transmission or use other frequency bands for simultaneous signal transmission, according to a signal transmission status of the currently used frequency band. Thus, the anti-interference ability of the monitoring device can be improved to reduce the error rate of signal transmission.