USB Set-Top Box Interface for Multi-Standard Broadcast Reception
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Solution Overview
Problem
Conventional digital broadcasting signal displaying systems are limited by compatibility with different standards, preventing the demodulation and display of digital broadcasting channels across various regions, and lack the ability to store video streams for future use.
Innovation Solution
A digital broadcasting signal displaying system and method that utilizes a digital signal receiving unit with a USB interface, allowing the set-top box to receive and demodulate signals from various standards, and enabling storage and display of video streams through a USB connection, with a set-top box that includes a USB control unit to manage signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional set-top box is used to demodulate digital broadcasting signals, then the signal can be processed for display, but the system cannot demodulate signals from different regional standards
Solution Approach 1:
The system separates the demodulation function from the set-top box by introducing an external digital signal receiving unit. The receiving unit handles demodulation of different regional standards while the set-top box focuses on processing and display, allowing multi-standard compatibility without complicating the main device.
Solution Approach 2:
A USB interface acts as an intermediary between the digital signal receiving unit and the set-top box. This intermediary enables data transmission between devices with different demodulation capabilities, allowing the system to handle multiple regional standards through a standardized communication interface.
2Productivity
If video data is processed and output directly to display device, then real-time display is achieved, but the video stream cannot be stored for future display
Solution Approach 1:
The digital signal receiving unit serves multiple functions: it demodulates signals from different regional standards and simultaneously provides both real-time video output to the display device and stored video data for future playback, making the system versatile in handling different display needs.
Solution Approach 2:
The USB interface serves as an intermediary that enables dual functionality: it transmits video data in real-time for immediate display while also allowing data to be written to and read from the storage unit, enabling both live viewing and recorded playback through the same communication channel.
3Device complexity
If the set-top box handles all processing internally, then system simplicity is maintained, but compatibility with different demodulation standards is lost
Solution Approach 1:
The system divides functionality into two segments: the digital signal receiving unit handles demodulation of various regional standards, while the set-top box handles processing and display. This segmentation maintains relative simplicity in each component while achieving overall system versatility.
Data Source
AI summary
A digital broadcasting signal processing method for processing a multimedia stream by a set-top box is disclosed. A USB request command set is pre-defined in a digital signal receiving unit to support the set-top box. The digital signal receiving unit transmits data with the set-top box and controls the signal quality of the data transmission according to the USB request commands transmitted by the set-top box while the digital signal receiving unit connected with the set-top box via USB.