Digital Spur Cancellation in Integrated Bluetooth FM Chip
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Integrating multiple audio communication technologies, such as Bluetooth and FM, into a single portable device poses challenges due to coexistence problems, power consumption issues, and the need for separate processing hardware and software, which complicates design and operation.
Innovation Solution
A system and method for digital spur cancellation using a single chip with integrated Bluetooth and FM radios, employing a CORDIC algorithm and Hilbert transform to demodulate and phase-shift signals, allowing for efficient processing and cancellation of spur noise in baseband signals, thereby enhancing signal-to-noise ratio and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple audio communication technologies (Bluetooth and FM) are integrated into a single device, then functionality and versatility are improved, but coexistence problems and design complexity increase
Solution Approach 1:
The patent combines Bluetooth and FM radio processing capabilities into a single integrated chip, merging previously separate hardware components. This integration reduces the number of discrete parts while maintaining full functionality of both communication technologies, directly addressing the technical contradiction by improving versatility without proportionally increasing design complexity.
Solution Approach 2:
The integrated chip is designed to perform multiple functions - it can process both Bluetooth audio data and FM radio signals through shared hardware resources including the ADC, baseband processor, and audio interface. This multi-functionality allows a single device to support multiple audio communication technologies without requiring completely separate processing paths for each.
2Adaptability or versatility
If multiple audio communication technologies are integrated into a single device, then versatility is improved, but separate processing hardware and software requirements increase design complexity
Solution Approach 1:
The patent merges Bluetooth and FM radio processing hardware into a single integrated chip, combining previously separate ADCs, baseband processors, and audio interfaces into shared resources. This hardware consolidation reduces the total number of discrete components while maintaining the versatility to support both communication technologies simultaneously or independently.
3Adaptability or versatility
If simultaneous use of multiple radios is implemented, then communication capability is improved, but power consumption increases
Solution Approach 1:
The integrated chip shares power-hungry components such as the ADC and baseband processor between Bluetooth and FM radio functions. When both radios operate simultaneously, they share these resources rather than each requiring dedicated hardware, thereby reducing total power consumption compared to having completely separate processing paths for each communication technology.
4Use of energy by moving object
If more processing is done digitally to reduce analog parts, then power consumption is reduced, but processing overhead and complexity increase
Solution Approach 1:
The patent replaces analog signal processing with digital processing throughout the audio communication chain. The ADC converts analog FM and Bluetooth signals to digital format early in the processing chain, enabling subsequent digital filtering, demodulation, and audio processing. This substitution eliminates the need for separate analog processing circuits for each radio type, reducing power consumption while the integrated digital baseband processor manages the processing overhead efficiently through shared resources.
Data Source
AI summary
A method and system for digital spur cancellation may include removing a spur in a left channel minus right channel (L−R) baseband signal generated from a FM signal. The L−R baseband signal may be generated by demodulating a sub-carrier, for example, by using CORDIC algorithm, in a signal demodulated from the FM signal. An orthogonal signal may also be generated by demodulating a sub-carrier, for example, by using CORDIC algorithm, in a signal demodulated from the FM signal. The phase of the orthogonal signal may be further adjusted to introduce a substantially −90° phase shift to spurs at a specific frequency. Accordingly, the spurs in the L−R baseband signal may be cancelled when the first L−R baseband signal is combined with the phase adjusted orthogonal signal.