Audio Playback System Using Visible Light Communication
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Solution Overview
Problem
Current methods for controlling digital stereo sets using handheld devices are not cost-effective or user-friendly, as they require wireless communication technologies like Wi-Fi, Bluetooth, or near-field communication, which are costly and generate electromagnetic radiation harmful to humans.
Innovation Solution
An audio playback system that uses visible light communication between a handheld device and a digital stereo set, where the handheld device converts control messages into visible light signals using a visible light emitting element and optical signal generator, and the digital stereo set receives these signals using an optical sensor and signal reader to perform corresponding control actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless communication technology (Wi-Fi, Bluetooth, NFC) is used to control the digital stereo set, then communication functionality is achieved, but the system becomes costly and generates harmful electromagnetic radiation
Solution Approach 1:
The patent replaces wireless electromagnetic communication with optical communication using visible light. The handheld device's display screen modulates visible light to encode control signals, which are then detected by an optical sensor in the digital stereo set. This substitutes the harmful radio frequency electromagnetic field with optical energy, eliminating the harmful electromagnetic radiation while maintaining communication functionality.
Solution Approach 2:
The patent introduces visible light as an intermediary carrier for transmitting control signals. Instead of direct wireless electromagnetic communication between devices, the system uses modulated visible light from the display screen as a mediator to convey control information to the optical sensor, achieving communication without harmful radiation.
2Reliability
If wireless communication chips are added to both devices for communication, then communication capability is enabled, but the system cost increases
Solution Approach 1:
The patent makes the display screen serve multiple functions: it acts as both the user interface for displaying information and as a wireless communication transmitter by modulating visible light. This eliminates the need for separate wireless communication chips in the handheld device, reducing system cost while maintaining communication capability. The digital stereo set uses its existing camera or optical sensor for receiving signals, avoiding the need for additional communication hardware.
3Ease of operation
If traditional control panel or remote controller is used, then basic control functions are provided, but the control is not personalized and lacks diversified control items
Solution Approach 1:
The patent enables the handheld device to provide diversified and personalized control actions by utilizing the existing application programs and functions of the smartphone or tablet. The system can recognize different applications (music players, video players, etc.) and provide context-aware control options, allowing users to control various media playback functions, adjust settings, and perform personalized operations that go far beyond basic control panel capabilities.
Solution Approach 2:
The patent implements a feedback mechanism where the digital stereo set sends status information back to the handheld device through the same optical communication channel. This allows the control system to adapt to the current playback state and provide relevant control options, enabling intelligent and personalized control based on real-time system status.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution eliminates the need for costly wireless communication technologies, reduces electromagnetic radiation, and enables personalized control actions, simplifying the pairing process and enhancing user convenience.
Implementation Method 1
a first visible light emitting element and a first optical signal generator. The first optical signal generator is used 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
Implementation Method 2
a first optical sensor and a first optical signal reader. The first optical sensor is used for sensing the on/off states of the first visible light emitting element, thereby receiving the first visible light signal
Data Source
AI summary
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.