Abstract: A method for unlocking a door, a method for renting asset and a system thereof are provided in the present invention. The door includes an audio receiver, and the method includes the steps of: storing a unlock sequence into a mobile device; performing a audio modulation to generates a audio modulation voiceprint signal, wherein the frequency range of the audio modulation voiceprint signal is in the audio frequency; playing the audio modulation voiceprint signal by using the speaker of the mobile device; when the audio receiver receives the audio modulation voiceprint signal, the method further includes: performing a audio demodulation to obtain the unlock sequence; and determining whether the door is unlock or not according to the unlock sequence.

Abstract: An interactive photovoltaic device and an interactive photovoltaic system are provided. The interactive photovoltaic device communicates with a mobile device without any external power and battery. The mobile device has a display panel. The interactive photovoltaic device includes a case, a solar panel, an optical signal receiver and a control circuit. The solar panel is disposed on a first area of a bottom of the case. The optical signal receiver is disposed on a second area of the bottom of the case. When the mobile device executes interactive software and the interactive photovoltaic device is disposed on the display panel of the mobile device, the interactive photovoltaic device receives display panel light through the solar panel to enable the control circuit, and the control circuit receives an optical signal through the optical signal receiver, and decodes the optical signal to obtain an interactive instruction inputted by a user.

Abstract: A Bluetooth data/control message transmission module, an interaction device and a method thereof are provided in the present invention. The Bluetooth data/control message transmission module connects to a mobile device with Bluetooth. The Bluetooth data/control message transmission module includes a process unit, a modulation module and a Bluetooth module. The process unit is for providing a digital data. The modulation module receives the digital data and modulates the digital data with a analog carrier signal to generate a modulation signal whose frequency is lower than 8 KHz. The Bluetooth module uses a headset profile to link with the mobile device, wherein the mobile device serves the Bluetooth module as a headset. The Bluetooth module samples the modulation signal, to serve the sampled modulation signal as a voice signal to send to the mobile device through the Bluetooth protocol.

Abstract: A method for unlocking a door, a method for renting asset and a system thereof are provided in the present invention. The door includes an audio receiver, and the method includes the steps of: storing a unlock sequence into a mobile device; performing a audio modulation to generates a audio modulation voiceprint signal, wherein the frequency range of the audio modulation voiceprint signal is in the audio frequency; playing the audio modulation voiceprint signal by using the speaker of the mobile device; when the audio receiver receives the audio modulation voiceprint signal, the method further includes: performing a audio demodulation to obtain the unlock sequence; and determining whether the door is unlock or not according to the unlock sequence.

Abstract: A Bluetooth data/control message transmission module, an interaction device and a method thereof are provided in the present invention. The Bluetooth data/control message transmission module connects to a mobile device with Bluetooth. The Bluetooth data/control message transmission module includes a process unit, a modulation module and a Bluetooth module. The process unit is for providing a digital data. The modulation module receives the digital data and modulates the digital data with a analog carrier signal to generate a modulation signal whose frequency is lower than 8 KHz. The Bluetooth module uses a headset profile to link with the mobile device, wherein the mobile device serves the Bluetooth module as a headset. The Bluetooth module samples the modulation signal, to serve the sampled modulation signal as a voice signal to send to the mobile device through the Bluetooth protocol.

Abstract: A system using detectable signals of panel for data communication includes the panel, at least one detectable signal detector, and a control unit. The panel has a surface for displaying an image. At least one area of the surface is used to display variation of a detectable signal. The at least one detectable signal detector is coupled to the at least one area for detecting the variation of the detectable signal in the at least one area and producing a corresponding detection signal. The control unit is connected to the at least one detectable signal detector for receiving the detection signal. Thus, the control unit can receive the data sent from the at least one area.

Abstract: A multiplexed audio cable joystick includes plural keys, a key scanner, a frame format encoder, a transmission modulator, and a DAC. The key scanner is connected to the keys for scanning states of the keys to output pressed key information, The frame format encoder is connected to the key scanner for generating a frame transmission data according to the pressed key information. The transmission modulator is connected to the frame format encoder for performing a carrier modulation on the frame transmission data to generate a modulated transmission data. The DAC is connected to the transmission modulator for converting the modulated transmission data into an analog audio data. The transmission modulator has the same frequency band as an audio signal spectrum, and the frequency band has plural sub-bands, such that the transmission modulator modulates the frame transmission data into one of the sub-bands for transmitting data in multiplexing.