WLAN Voice Transceiver Switching for Call Management and Audio Quality
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Solution Overview
Problem
Bluetooth devices experience degradation in voice communications due to packet loss and delays, leading to poor audio quality, and lack additional user functionality beyond wired headsets.
Innovation Solution
A wireless local area network (WLAN) transceiving integrated circuit with a WLAN interface, transcoder, and switch box that converts packetized audio data to Pulse Code Modulated (PCM) audio, enabling improved call management features like conferencing, forwarding, holding, and muting, and providing enhanced audio signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If packetized audio data is transmitted at high data rates over WLAN, then transmission speed is improved, but packet loss and delays occur leading to degraded voice quality
Solution Approach 1:
The patent segments the audio data transmission into smaller packets with appropriate timing and spacing, rather than transmitting large blocks of data at high speed. This segmentation allows the system to maintain high overall transmission rates while ensuring individual packets are delivered reliably without causing buffer overflow or excessive delay that would degrade voice quality.
2Device complexity
If Bluetooth devices use simple packet forwarding, then device complexity is reduced, but additional user functionality beyond wired headsets is not achieved
Solution Approach 1:
The WLAN interface is designed to perform multiple functions beyond simple packet forwarding, including audio data reception and transmission, conferencing operations, call management, and integration with both Bluetooth and non-Bluetooth devices. This multi-functionality is achieved without proportionally increasing device complexity through efficient resource sharing and integrated architecture.
Solution Approach 2:
The patent combines Bluetooth functionality with WLAN capabilities in a single integrated device, merging the strengths of both technologies. The system integrates packetized audio handling from Bluetooth devices with the higher data rate capabilities of WLAN, creating a unified communication platform that provides enhanced functionality while managing complexity through integration rather than separate systems.
3Duration of action of moving object
If the second Bluetooth device buffers packetized audio data for extended presentation, then audio playback duration is improved, but packet loss detection accuracy deteriorates when buffer is consumed
Solution Approach 1:
The system implements feedback mechanisms where the receiving device continuously monitors buffer status and packet arrival patterns. When the buffer is being consumed or is running low, the system receives feedback about this status and can adjust its operation accordingly, such as requesting retransmission or adjusting playback rate, thereby maintaining accurate packet loss detection while still providing extended audio playback through buffering.
Data Source
AI summary
A wireless local area network (WLAN) transceiving integrated circuit services voice communications in a WLAN with at least one other WLAN device and includes a WLAN interface, a transcoder, and a switch box. The WLAN interface wirelessly communicates with at least one WLAN device to receive inbound packetized audio data from the at least one WLAN device and to transmit outbound packetized audio data to the at least one WLAN device. The transcoder receives the inbound packetized audio data and converts the inbound packetized audio data to inbound Pulse Code Modulated (PCM) WLAN audio data. The WLAN interface also receives outbound PCM WLAN audio data and converts the outbound PCM WLAN audio data to the outbound packetized audio data. The switch box operably couples between the transcoder and a PCM bus, to which an audio COder/DECoder (CODEC) couples. A speaker and a microphone coupled to the audio CODEC. The switch box enables the WLAN transceiving integrated circuit to perform call conferencing operations, call forwarding operations, call hold operations, call muting operations, and call waiting operations.