Vehicle Infotainment Head Unit Audio Quality via Dual Wireless Links
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Solution Overview
Problem
The existing infotainment system head units in vehicles face challenges in maintaining audio quality during hands-free phone calls due to bandwidth limitations of the Bluetooth HFP, which restricts digital audio signal transmission to a sampling frequency of 16 kHz, resulting in reduced audio quality under unfavorable acoustic conditions within vehicles.
Innovation Solution
The head unit employs a further wireless link, such as a WLAN or internal mobile radio module, to exceed the bandwidth restrictions of the Bluetooth HFP, enabling digital audio signal transmission with sampling frequencies higher than 16 kHz, up to 44 kHz or more, thereby improving audio quality by using an audio processing module with various codecs and an audio control module to determine optimal sampling frequencies and codecs based on available bandwidth and communication conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Bluetooth HFP is used for hands-free phone calls, then connectivity and basic audio transmission are achieved, but audio quality is reduced due to bandwidth limitations restricting sampling frequency to 16 kHz
Solution Approach 1:
The patent divides the audio transmission function into two separate communication channels: Bluetooth HFP for control and connectivity, and WLAN/mobile radio for high-quality audio data transmission. This segmentation allows each protocol to operate at its optimal performance level without being constrained by the other's limitations.
Solution Approach 2:
The head unit acts as an intermediary device that receives control signals via Bluetooth HFP from the mobile terminal, then independently manages high-quality audio transmission through WLAN or mobile radio connections. This intermediary role resolves the contradiction by decoupling the connectivity function from the audio quality function.
2Manufacturing precision
If a further wireless link (WLAN/mobile radio) is used to exceed Bluetooth HFP bandwidth restrictions, then audio quality is improved with sampling frequencies up to 44 kHz, but device complexity increases
Solution Approach 1:
The head unit is designed with multi-functionality, supporting both Bluetooth HFP for basic connectivity and WLAN/mobile radio for enhanced audio transmission. This universal design allows the system to adapt to different quality requirements without requiring separate dedicated devices.
Solution Approach 2:
The system dynamically selects between Bluetooth HFP-only mode and dual-connection mode based on audio quality requirements. The audio processing module activates the further wireless link only when high-quality audio transmission is needed, thereby managing device complexity adaptively rather than statically.
3Productivity
If digital audio signal transmission is limited to 16 kHz sampling frequency, then Bluetooth HFP bandwidth requirements are met, but audio quality under unfavorable acoustic conditions deteriorates
Solution Approach 1:
The patent adds another dimension to the communication architecture by introducing a parallel wireless link (WLAN/mobile radio) that operates independently from Bluetooth HFP. This dimensional expansion provides an additional pathway for audio data transmission with higher bandwidth capacity, overcoming the limitations of the single-dimension Bluetooth constraint.
Data Source
AI summary
The present disclosure relates to a head unit for an infotainment system of a vehicle. The head unit is coupled to a mobile terminal device via a Bluetooth link. The head unit is configured to exchange a digital audio signal adapted for improved audio quality during the hands-free talking, via an additional wireless link, in response to hands-free talking during a phone call with the mobile terminal device coupled via the Bluetooth link based on a hands-free profile.