Digital RDS Receiver Circuitry for FM Demodulation

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Solution Overview

Problem

Existing radio data system (RDS) receiver circuitry often operates in the analog domain, requiring unnecessary digital-to-analog conversion, which introduces delay, increases complexity, and consumes additional area.

Innovation Solution

Implementing digital RDS receiver circuitry that includes mixer, filter, downsampler, and decoder components to process RDS signals entirely in the digital domain, avoiding the need for digital-to-analog conversion by shifting, downsampling, and decoding signals to extract RDS information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If digital-to-analog conversion is performed to process RDS signals, then the RDS receiver circuitry can operate in the analog domain, but this introduces delay, increases complexity, and consumes additional area

Engineering Contradiction:

ImproveRDS signal processing capabilityVSAvoidcircuitry complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces the analog domain processing system with a digital domain processing system. Instead of converting digital signals to analog for RDS processing and back again, the invention maintains everything in the digital domain using digital filters, digital frequency shifters, and digital decoders, thereby eliminating the need for digital-to-analog converters and their associated complexity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent extracts and removes the digital-to-analog conversion stage from the signal processing chain. By taking out this unnecessary conversion step, the system achieves direct digital processing of RDS signals, reducing complexity, area, and delay while maintaining full RDS functionality

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If digital-to-analog conversion is performed for RDS processing, then analog RDS receiver circuitry can be used, but this consumes additional area

Engineering Contradiction:

ImproveRDS receiver functionalityVSAvoidcircuitry area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent merges the RDS processing functions directly into the digital signal processing path. By combining the RDS decoder, frequency shifter, and filter functions into the existing digital audio processing chain, the invention eliminates separate analog RDS processing circuitry and digital-to-analog converters, thereby reducing total circuit area while maintaining RDS functionality

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If digital-to-analog conversion is used in RDS processing, then the system can handle analog signals, but this introduces processing delay

Engineering Contradiction:

Improvesignal processing capabilityVSAvoidprocessing delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent substitutes analog conversion processes with direct digital processing operations. By replacing digital-to-analog conversion and subsequent analog filtering with digital filtering and processing, the invention eliminates the time required for conversion operations, thereby reducing overall processing delay while maintaining signal integrity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS9065709B1Digital radio data system receiver methods and apparatus

Publication Date: 2015.06.23 MARVELL ASIA PTE LTD

AI summary

Methods and apparatus are provided for receiving a first signal and generating an output signal indicative of radio data system (“RDS”) information. A receiver circuit of the invention can include mixer circuitry, lowpass filter circuitry, downsampler circuitry, and decoder circuitry. Advantageously, the receiver circuit can operate entirely within the digital domain, promoting interoperability with digital frequency modulation (“FM”) demodulator circuitry.