Abstract: A method for adjusting backlight brightness of a screen, including the following steps of: detecting a brightness of ambient light; collecting the ambient light; adjusting a proportional ratio between collected light and light emitted from an internal light source according to the brightness of the ambient light; coupling the collected light with the light emitted from the internal light source according to the proportional ratio. An electronic device using the method is also disclosed.

Abstract: A method for audio modulation is provided. The method including: obtaining the digital audio signals of the caller in the process of communications; analyzing the digital audio signals and obtain a voice frequency of the caller; reading a voice frequency of the user from a memory, and calculate the rate of the voice frequencies between the caller and the user; modulating the user' analog audio signals according to the rate of the voice frequencies; converting the modulated analog audio signals into digital audio signals; coding the digital audio signals and modulating the coded digital audio signals and transmitting the modulated digital audio signals to the caller. Through the method, the user's voice is modulated to sound like the caller's voice, thereby increasing the interest of the process of communicating. Present invention also provides a communication device with the function of audio modulation.

Abstract: An audio processing apparatus (20) connected between an audio source (10) and an audio output (30) is provided. The audio processing apparatus is suitable for singing practice of users and includes a vocal removing unit (210) and a pitch change unit (220). The vocal removing unit is for removing vocal signals from audio signals of the audio source, and the pitch change unit is for changing pitch of the audio signals and outputting the audio signals to the audio output.

Abstract: A power generator (2) for supplying power to a portable device (1), the power generator includes a supporting ring (5) and is secured inside of the portable device. The supporting ring is an annular tube containing an eccentric ring (7). One or more magnet balls (8) are secured on the eccentric ring and make the center of gravity (10) of the eccentric ring not collinear with the center axis (9) of the eccentric ring. One or more wire coils (11) wrap around the supporting ring and produce electric power when the magnet balls rotates inside of the supporting ring. The electric power are then conducted to and stored in an energy storage (15). A portable device with such a built-in power generator is also provided.