Abstract: An overcurrent protection circuit and method for battery discharge. The overcurrent protection circuit includes a discharge switch tube; a discharge control module which is used for detecting the discharge current of batteries in real time, and judging whether an overcurrent is generated by way of comparing the detected discharge current with a preset limiting value, the discharge control module controlling switch-on of the discharge switch tube if no overcurrent is generated, the discharge control module controlling switch-off of the discharge switch tube if an overcurrent is generated, and the discharge control module locking the discharge switch tube in a switch-off state when the overcurrent has timed out; and a time delay module which is used for judging whether the overcurrent has timed out by way of comparing the time when the overcurrent is generated with a preset delay time.

Abstract: A method and device for communication based on a trunking system. A first repeater sends an identifier of a free repeater and state information of the first repeater to a terminal, the free repeater being a repeater designated from repeaters which are of pre-set type having at least one idle timeslot channel; when the terminal analyses the state information of the first repeater to find that the first repeater has an idle timeslot channel, and a pre-set main repeater is the first repeater, the terminal uses the first repeater to perform communication; and when the terminal analyses the state information of the first repeater to find that all timeslot channels of the first repeater are occupied, if the terminal does not participate in data communication of the first repeater, the terminal accesses the free repeater to perform communication.

Abstract: A terminal and method for improving the terminal reception sensitivity; when the terminal works in a time division duplexing mode, the method comprises: in a transmitting time slot, using the frequency of the transmitting voltage control oscillator (VCO) of the terminal as a first frequency; and in a receiving time slot, using the frequency of the transmitting VCO of the terminal as a preset second frequency, the predetermined second frequency differs from the first frequency in the bandwidth of at least one channel. The present invention improves the reception sensitivity of a terminal, reduces the production cost of the terminal, and decreases product size.

Abstract: An acoustic feedback detection method and device. According to the method, whether acoustic feedback occurs is determined based on a frequency characteristic of an acoustic feedback signal. Specifically, a judgment value is determined using a power peak value and an average peak value, and it is determined whether acoustic feedback occurs in a signal based on a magnitude of the judgment value and a duration of the power peak value. In this case, whether acoustic feedback occurs can be determined based on the frequency characteristic of the signal.

Abstract: A communication mode switching method and device. The method comprises: receiving a sending request; detecting whether the radio-frequency signal strength of a downlink channel meets a first threshold; when the radio-frequency signal strength is greater than or equal to the first threshold, determining that a relay station is in a working state, and keeping a relaying mode to finish the sending request; when the radio-frequency signal strength is less than the first threshold, determining that the relay station is in an abnormal state, and switching to an offline mode to finish the sending request, the offline mode specifically being to perform sending after regulating the sending frequency to be the receiving frequency of the downlink channel.

Abstract: A high priority service sending method and device in a direct mode, and a high priority service receiving method and device in a direct mode. The receiving method includes: after sending a voice frame in a voice call sending state, a user terminal receiving and detecting a priority frame in another time slot with respect to the time slot occupied by the voice call; and if the priority frame is detected, then stopping the voice call and receiving a high priority service frame in the other time slot. Using the present invention can enable an interphone in a transmitting state in a direct mode to send or receive a high priority service as well.

Abstract: A portable wireless signal transfer system, method and terminal. The method comprises: a first terminal receiving a wireless signal; the first terminal demodulating the wireless signal to obtain burst data and a timeslot number; the first terminal sending the burst data and the timeslot number to a second terminal; the second terminal receiving the burst data and the timeslot number sent by the first terminal; the second terminal performing signal modulation on the burst data; and the second terminal transmitting a signal obtained after the signal modulation in a corresponding timeslot according to the timeslot number. The wireless signal transfer function of a conventional transfer stage can be achieved using two portable terminals, which have the advantages of being easy to carry, economic, flexible, etc., and the application requirements of a conventional communication system are fully adapted.

Abstract: A realization method, apparatus and system for remote monitoring, the remote monitoring technique is used between interphones, which includes the following contents: a monitored party receives a remote monitoring request from a monitoring party, the remote monitoring request includes a target control information; the monitored party answers confirming information to the monitoring party after receiving the remote monitoring request successfully, and analyzes the target control information, and then selects transmission mode; the monitored party enters monitored state, starts transmission automatically, and implements the transmission according to the selected transmission mode. Applying the embodiments of the present invention, the remote monitoring function of a interphone will be improved, and the monitoring party can initiatively control the transmission time of the monitored party; or transmission interval and times of the monitored party, so as to realize the repeat monitoring is realized.

Abstract: Disclosed are a communication method based on a time division multiple access communication system, and a terminal. The method comprises: receiving, by a communication terminal, an embedded signalling frame, conducting embedded type information parsing on the embedded signalling frame to obtain an embedded signalling and control information; in accordance with the control information, caching, by the communication terminal, the embedded signalling to corresponding caching regions; and when each corresponding caching region has already been cached with the embedded signalling, conducting embedded type signalling decoding, by the communication terminal, on the embedded signalling in all the caching regions so as to obtain a control signalling. The technical solution of the present invention can shorten the terminal access duration of the time division multiple access communication system, thereby improving the access performance of the time division multiple access communication system.

Abstract: A communication establishment method, mobile station and transfer device based on transfer mode. The method comprises: a first mobile station sends to the transfer device control information including the slot used by the first mobile station and the control signalings corresponding to different service types, in order that the transfer device determines a transfer slot and gets ready for communication according to the control signalings; and the first mobile station communicates with a target mobile station group through the transfer slot. The transfer device can accurately acquire the slot used by the mobile station, thus reducing communication error rate and solving the problem that the transfer device can not identify the slot in the use of the mobile station and can not support delayed access. Meanwhile, the technical solution can be compatible with existing transfer device and mobile station.

Abstract: A terminal and method for improving the terminal reception sensitivity; when the terminal works in a time division duplexing mode, the method comprises: in a transmitting time slot, using the frequency of the transmitting voltage control oscillator (VCO) of the terminal as a first frequency; and in a receiving time slot, using the frequency of the transmitting VCO of the terminal as a preset second frequency, the predetermined second frequency differs from the first frequency in the bandwidth of at least one channel. The present invention improves the reception sensitivity of a terminal, reduces the production cost of the terminal, and decreases product size.

Abstract: A call collision processing method, a terminal and a repeater are disclosed according to the disclosure. The method includes: sending, by a terminal, an access request to a repeater, where the access request includes a preset number of access request bursts; monitoring, by the terminal, a channel state of the repeater, and determining, by the terminal, whether the repeater transfers the access request burst within a preset period of monitoring time; sending, by the terminal, subsequent bursts to the repeater if the repeater successively transfers the access request bursts of the terminal for at least two times within the preset period of monitoring time; and stopping sending, by the terminal, the subsequent bursts to the repeater if the repeater successively transfers access request bursts of another terminal for at least two times within the period of the preset monitoring time.

Abstract: A communication mode switching method and device. The method comprises: receiving a sending request; detecting whether the radio-frequency signal strength of a downlink channel meets a first threshold; when the radio-frequency signal strength is greater than or equal to the first threshold, determining that a relay station is in a working state, and keeping a relaying mode to finish the sending request; when the radio-frequency signal strength is less than the first threshold, determining that the relay station is in an abnormal state, and switching to an offline mode to finish the sending request, the offline mode specifically being to perform sending after regulating the sending frequency to be the receiving frequency of the downlink channel.

Abstract: A portable terminal has a main machine body and a cell, one of the main machine body and the cell is arranged a pushing button moving axially, and a compression spring is arranged between the pushing button and the one of the main machine body and the cell, the other has a clamp slot of which a notch extends axially, and the main machine body and the cell is clamped at the axial direction by the pushing button and the clamp slot. The portable terminal also comprises a lock cover connected with the pushing button, and a torsional spring is arranged between the lock cover and the pushing button, so that the lock cover and the pushing button can rotate along the spring-body axis of the torsional spring; when the torsional spring is reset, vertical distance between one end of the lock cover and the cell or the body arranged the compression spring is smaller than the distance that the pushing button inserts into the clamp slot.

Abstract: A portable wireless signal transfer system, method and terminal. The method comprises: a first terminal receiving a wireless signal; the first terminal demodulating the wireless signal to obtain burst data and a timeslot number; the first terminal sending the burst data and the timeslot number to a second terminal; the second terminal receiving the burst data and the timeslot number sent by the first terminal; the second terminal performing signal modulation on the burst data; and the second terminal transmitting a signal obtained after the signal modulation in a corresponding timeslot according to the timeslot number. The wireless signal transfer function of a conventional transfer stage can be achieved using two portable terminals, which have the advantages of being easy to carry, economic, flexible, etc., and the application requirements of a conventional communication system are fully adapted.

Abstract: A method, a terminal, and a system for implementing call diversion. The method comprises: when a call access anomaly of a request terminal occurs, setting and sending call forwarding request information to a target terminal; the target terminal reading a call forwarding identification in the call forwarding request information, determining whether the call forwarding identification is correct, and if yes, reading an address of the target terminal in the call forwarding request information; the target terminal determining whether the address of the target terminal is correct, and if yes, reading a forwarding address identification in the call forwarding request information, setting a forwarding terminal address according to the forwarding address identification, and setting and sending call forwarding success response information to the request terminal; and the request terminal receiving the call forwarding success response information and setting up call forwarding.

Abstract: A method, a terminal, and a system for implementing call diversion. The method comprises: when a call access anomaly of a request terminal occurs, setting and sending call forwarding request information to a target terminal; the target terminal reading a call forwarding identification in the call forwarding request information, determining whether the call forwarding identification is correct, and if yes, reading an address of the target terminal in the call forwarding request information; the target terminal determining whether the address of the target terminal is correct, and if yes, reading a forwarding address identification in the call forwarding request information, setting a forwarding terminal address according to the forwarding address identification, and setting and sending call forwarding success response information to the request terminal; and the request terminal receiving the call forwarding success response information and setting up call forwarding.

Abstract: A method and device for adaptively adjusting sound effect, and the method comprises: obtaining an energy value of the current ambient noise; receiving a first trigger instruction and adjusting the current output volume based on the energy value of the current ambient noise; while judging that the energy value of the current ambient noise is bigger than a first threshold, processing treble enhancement; while judging that the energy value of the current ambient noise is less than a second a sound threshold, processing bass enhancement. By collecting the voice data and detecting the speech activity on the voice data, when the first trigger instruction is received, the method can adjust the current volume and adjust the frequency response by the treble enhancement or the bass enhancement based on the energy value of the current ambient noise, thereby obtaining the better sound effect and easy to achieve.

Abstract: A smooth switching device and method for double power supplies. The devices includes a main/backup power supply switching unit (1), a relay control unit (3), a charge management unit (2), a main power supply switching auxiliary unit (4) and a backup power supply switching auxiliary unit (5). The device and the method enable the main power supply (200) and the backup power supply (300) which supply power for electric equipment (100) to be switched smoothly, so that it is not easy for the electric equipment (100) to be disconnected with the power supplies and the fluctuation of a load voltage is small. Moreover, the device doesn't need a bulk capacitor used for auxiliary switching and doesn't need to be used together with a radiator.

Abstract: A dual frequency antenna comprises: a helix coil, of which the lower end is provided with a first resonant coil with a first pitch and of which the upper end is provided with a second resonant coil with a second pitch, for resonating at a frequency lower than the resonant frequency of the first resonant coil, wherein, the first pitch is larger than the second one; a first coupling unit, which is installed in the first resonant coil and is electrically isolated from the first resonant coil, for stabilizing resonant frequency performance of the first resonant coil; and a second coupling unit, which is installed outside the helix coil and is electrically isolated from the helix coil, for increasing equivalent electrical length of the first resonant coil and raising resonant frequency gain of the first coil.