Abstract: A riser card includes a main body and an inserting portion. The main body includes a lower portion and defines a power supply interface. The inserting portion is coupled to the lower portion of the main body. The inserting portion can be inserted in and coupled to different expansion slots. The power supply interface can be coupled to an external power source to supply power to the riser card.

Abstract: A power supply switch apparatus includes a first interface, a switch circuit, and a power supply circuit. The first interface includes a first control signal output terminal, a second control signal output terminal, and a third control signal output terminal. Each of the first control signal output terminal, the second control signal output terminal, and the third control signal output terminal outputs a control signal according to an electronic device inserted in the first interface. The switch circuit receives the control signals and outputs a power supply signal accordingly. The power supply circuit receives the power supply signal, and provides a first direct current (DC) voltage or a second DC voltage to the electronic device according to the power supply signal.

Abstract: A riser card includes a main body and an inserting portion. The main body includes a lower portion and defines a power supply interface. The inserting portion is coupled to the lower portion of the main body. The inserting portion can be inserted in and coupled to different expansion slots. The power supply interface can be coupled to an external power source to supply power to the riser card.

Abstract: A power supply switch apparatus includes a first interface, a switch circuit, and a power supply circuit. The first interface includes a first control signal output terminal, a second control signal output terminal, and a third control signal output terminal. Each of the first control signal output terminal, the second control signal output terminal, and the third control signal output terminal outputs a control signal according to an electronic device inserted in the first interface. The switch circuit receives the control signals and outputs a power supply signal accordingly. The power supply circuit receives the power supply signal, and provides a first direct current (DC) voltage or a second DC voltage to the electronic device according to the power supply signal.

Abstract: An interface switch apparatus includes a first interface, a switch circuit, a second interface, and a south bridge chip. The first interface includes a first control signal output terminal, a second control signal output terminal, and a third control signal output terminal. The second interface includes an identifying signal output terminal. The south bridge chip includes an identifying signal input terminal. The first control signal output terminal, the second control signal output terminal, and the third control signal output terminal output control signals according to a device inserted in the first interface. The switch circuit receives the control signals, and outputs an identifying signal accordingly. The identifying signal output terminal and the identifying signal input terminal receives the identifying signal. The south bridge chip determines a type of the device inserted in the first interface by a voltage level of the identifying signal.

Abstract: An audio transmission system includes a plug, a control circuit coupled to the plug, an output interface coupled to the control circuit, and an input interface coupled to the control circuit. The plug is configured to couple to an audio interface of an electronic device. The audio interface is configured to input and output audio signals. The control circuit is configured to control the output audio signals and the input audio signals. The audio signals from the audio interface are output externally via the output interface. External audio signals are input to the audio interface via the input interface.

Abstract: A keyboard assembly with voice-recognition ability includes a keyboard module, a wireless transceiver chip, a voice-recognition chip, and a voice-receiver member. The chips and the member are mounted in the keyboard module. The keyboard module includes a keyboard body and a keyboard control processor mounted on the keyboard body. The keyboard control processor is configured to communicate with an electronic device. The keyboard body includes a plurality of keys. The voice-receiver member receives a voice instruction and sends the voice instruction to the voice-recognition chip. The voice-recognition chip can recognize the voice instruction as a key signal corresponding to one of the keys and sends the key signal to the wireless transceiver chip. The wireless transceiver chip sends the key signal to the electronic device. A voice-recognition method is also provided.

Abstract: A method for character input using an electronic device includes recording movement displacements of the electronic device using a sensor when a character input function of the electronic device is invoked. The method determines movement coordinates based on a predetermined coordinate system according to the movement displacements. When the electronic device stops moving for a predetermined time duration, it is determined that one character has been inputted. A movement path is determined according to the movement coordinates and a recording sequence of the movement displacements, and a character corresponding to the movement path is generated and displayed.

Abstract: A light painting method for character input using an electronic device includes adjusting an image capturing device according to preset capturing parameters. The image capture device is enabled to capture a light painting image of a lighting device at each predetermined time interval. The light painting image is converted to a reflection image when the light painting image is a mirror image. The method recognizes a movement path of light in the reflection image, and generates a character corresponding to the movement path of the light.