Common Sampling Frequency for Multi-Band Radio Receiver
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Solution Overview
Problem
Current DAB, FM, and AM radio receivers require separate tuner modules and multiple receiver paths to handle different frequency bands, leading to increased complexity and resource utilization, especially in mobile systems where diversity algorithms and additional features like RDS and TMC are implemented.
Innovation Solution
A method for direct sampling of multiple radio bands using a common sampling frequency, allowing DAB, FM, and AM signals to be received and processed with a simplified reception path by determining a common sampling frequency that can be applied across all bands, enabling simultaneous scanning and processing of DAB, FM, and AM signals with a single A/D converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate tuner modules and multiple receiver paths are used for different frequency bands, then reliable reception of multiple radio bands (DAB, FM, AM) is achieved, but device complexity and resource requirements increase
Solution Approach 1:
The patent combines multiple separate receiver paths into a single unified receiver path that can handle DAB, FM, and AM bands. By using a common A/D converter and shared signal processing components, the system merges previously separate functional paths while maintaining the ability to reliably receive all band types through standardized processing stages.
Solution Approach 2:
The receiver path is designed with universal components that can process multiple radio bands. The A/D converter and subsequent signal processing units are configured to handle different frequency ranges and modulation types, allowing a single receiver path to perform multiple functions that previously required separate dedicated paths.
2Quantity of substance
If bandwidth reduction is applied before digitization for FM/AM and DAB, then resource utilization is optimized, but the ability to receive multiple signals simultaneously is reduced
Solution Approach 1:
The receiver path employs dynamic bandwidth adjustment where the filtering and signal processing parameters can be adapted based on the selected radio band and reception requirements. This allows the system to optimize resource utilization for the current task while maintaining the capability to receive multiple signals when needed, rather than being constrained by fixed bandwidth reduction.
3Reliability
If multiple receiver paths are implemented for diversity algorithms and background reception, then reception quality is improved, but resource requirements and system complexity increase
Solution Approach 1:
The system implements background reception and diversity algorithms through periodic processing within the single receiver path. Instead of maintaining continuous parallel paths, the system can switch between active reception, background monitoring, and diversity processing in periodic cycles, maintaining reception quality while reducing overall resource requirements.
Data Source
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AI summary
A method for direct sampling of a plurality of radio bands, including a step of receiving a first radio band via a first interface and at least one additional radio band via at least one additional interface, the first radio band and the at least one additional radio band each being associated with different frequency ranges, and the first radio band or the at least one additional radio band being a DAB band. Furthermore, a selection signal is received via an interface, the selection signal indicating whether further processing of the first radio band and/or the at least one additional radio band takes place. Depending on the selection signal, the first radio band is sampled at a common sampling frequency and/or the at least one additional radio band is sampled at the common sampling frequency.