Audio playback system

摘要

An audio playback system includes a handheld device and a digital stereo set. By the handheld device, a control message is converted into a pulse signal. Moreover, the on/off states of a visible light emitting element are controlled according to first pulse signal, so that a visible light signal is generated. After the visible light signal is received by an optical sensor of the digital stereo set, the visible light signal is restored to the control message. After the control message is received by the digital stereo set, the digital stereo set performs a corresponding control action.

主权项

1. An audio playback system, comprising:
a handheld device comprising a first transmitting terminal controller, wherein the first transmitting terminal controller comprises:
a first visible light emitting element; anda first optical signal generator for converting a control message into a first pulse signal, and controlling on/off states of the first visible light emitting element according to the first pulse signal, thereby generating a first visible light signal, wherein the first optical signal generator comprises:
a first encoder for converting the control message into the first pulse signal; anda first optical modulator for controlling the on/off states of the first visible light emitting element according to the first pulse signal; and a digital stereo set comprising a host and a sound box for playing a digital audio file, wherein the digital stereo set further comprises a first receiving terminal controller, and the first receiving terminal controller comprises:
a first optical sensor for sensing the on/off states of the first visible light emitting element, thereby receiving the first visible light signal; anda first optical signal reader for restoring the first visible light signal to the control message, wherein the first optical signal reader comprises:
a first pre-processor for adjusting a first electric signal to reduce interference, wherein the first electric signal is generated when the on/off states of the first visible light emitting element is sensed by the first optical sensor;a first optical demodulator for restoring the first electric signal to the first pulse signal; anda first message interpreter for restoring the first pulse signal to the control message, wherein after the control message is received by the digital stereo set, the digital stereo set performs a corresponding control action according to the control message.