Synchronous Analog Digital Radio Receiver Processing
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Solution Overview
Problem
Existing digital radio broadcasting systems face complexity in processing analog and digital pathways asynchronously, leading to increased implementation complexity and difficulties in time aligning signals for blending, due to separate task scheduling and context switching.
Innovation Solution
The implementation of a method for synchronous processing of digital and analog components of a digital radio broadcast signal, using an asynchronous sample rate converter to adjust the sampling frequency and synchronize the receiver audio sampling clock with the transmitter clock, allowing for simultaneous processing of both pathways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If analog and digital pathways are processed asynchronously using separate task scheduling, then processing flexibility is maintained, but implementation complexity increases and time alignment becomes difficult
Solution Approach 1:
The patent merges the processing of analog and digital pathways into a single synchronous processing framework. By using a common sampling clock and processing both signal types together in the same computational loop, the system eliminates the need for separate task scheduling mechanisms, thereby reducing implementation complexity while improving time alignment between the two pathways.
Solution Approach 2:
The patent creates a universal processing architecture that handles both analog and digital signals through the same processing pipeline. The baseband processor is designed to universally process different signal types (analog and digital) using unified algorithms and data structures, eliminating the need for pathway-specific processing logic and reducing overall system complexity.
2Device complexity
If separate task scheduling is used for analog and digital demodulation, then processing independence is maintained, but context switching increases implementation complexity
Solution Approach 1:
The patent combines analog and digital demodulation tasks into a single processing loop that runs without context switching. By integrating both demodulation processes into one continuous execution flow with a unified sampling clock, the system eliminates the overhead of task switching while maintaining the ability to process both signal types independently when needed.
3Ease of operation
If asynchronous processing is used, then processing flexibility is maintained, but signal time alignment for blending becomes complex
Solution Approach 1:
The patent implements a universal processing approach where both analog and digital signals are processed through the same synchronous pipeline. This unified processing framework automatically maintains time alignment between signals, making the blending operation straightforward while reducing overall processing complexity compared to asynchronous approaches that would require additional synchronization logic.
Data Source
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AI summary
A method of processing a digital radio broadcast signal in a digital radio receiver includes: receiving baseband signal samples at a first sample rate; adjusting the sample rate of the baseband signals based on a difference between a receiver clock and a transmitter clock to produce adjusted baseband signal samples at a second sample rate; filtering the adjusted baseband signal samples to separate a digital component of the samples and an analog component of the samples, wherein the digital component and the analog component are synchronous; and separately demodulating the digital component and the analog component to produce a digital output signal and an analog output signal. A receiver that uses the method is also provided.