Bluetooth Video Call Audio Channel Switching

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Solution Overview

Problem

Conventional methods for implementing video calls using Bluetooth headsets are restricted by hardware limitations, particularly the lack of compatibility with Bluetooth headsets that do not support A2DP, limiting the availability of 3G mobile phones capable of executing video calls.

Innovation Solution

A method that modifies software to switch the PLAYBACK channel from SSP3 I2S mode to SSP4 PCM mode and changes the RECORD channel from the original AP module/audio module to the AP module/Bluetooth module mode, linking modules through PCM ports and the SCO using the AG unit, enabling Bluetooth video calls without hardware modifications.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional hardware framework is used for video calls, then hardware compatibility is maintained, but Bluetooth headset compatibility is limited to A2DP-only devices

Engineering Contradiction:

ImproveBluetooth headset compatibilityVSAvoidhardware interface structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent changes the audio channel parameters by switching from SSP3 I2S mode to SSP4 PCM mode, and modifies the sampling rate parameters to match between recording and playing channels. This allows the system to work with Bluetooth headsets that do not support A2DP by using different technical parameters for audio transmission.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces hardware interface restructuring with software-based channel switching. Instead of modifying physical hardware connections to achieve Bluetooth headset compatibility, the solution uses software to switch audio channels and configure PCM interfaces, eliminating the need for hardware changes.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If hardware interfaces are restructured to support Bluetooth video calls, then Bluetooth headset compatibility improves, but manufacturing complexity increases

Engineering Contradiction:

ImproveBluetooth video call supportVSAvoidhardware modification requirement

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent substitutes hardware modification with software configuration. The solution implements Bluetooth video call support by switching audio channels through software and configuring PCM interfaces, completely avoiding hardware restructuring and simplifying the manufacturing process.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent creates a virtual audio channel configuration that copies the functionality of dedicated Bluetooth video call hardware. By software-emulating the required audio pathways and interface settings, the system achieves Bluetooth video call capability without physical hardware changes.

Inventive Principle:

Principle #26Copying

3Adaptability or versatility

If audio channel is switched to BTVTCALL mode, then Bluetooth headset compatibility is achieved, but normal audio operation is interrupted

Engineering Contradiction:

ImproveBluetooth video call capabilityVSAvoidaudio channel configuration

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent implements dynamic audio channel switching that adapts to different operational modes. The system automatically configures the audio channel to BTVTCALL mode when Bluetooth video calls are active, and can switch back to normal operation mode when not needed, providing both Bluetooth compatibility and stable normal audio operation at different times.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The audio channel configuration periodically switches between normal mode and BTVTCALL mode based on call state. During Bluetooth video calls, the system activates the specialized channel configuration, and returns to normal operation afterward, allowing the system to maintain stability while providing specialized functionality when required.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS8885011B2Method for implementing video call with bluetooth-based headset and video communication terminal for the same

Publication Date: 2014.11.11 HUIZHOU TCL MOBILE COMM CO LTD

AI summary

Disclosed are a method for implementing a video call with a Bluetooth-based headset and a video communication terminal. The method includes: looking up a Bluetooth headset; starting a VTCALL unit of the AP module and an AG unit; sending a VTCALL command and an AG command to the audio module; switching an audio channel to a BTVTCALL channel; starting a recording and playing mode of the video communication terminal, collecting uplink and downlink audio data, and transmitting the uplink and the downlink audio data to the Bluetooth module; transmitting the uplink and the downlink audio data to the Bluetooth headset; executing the data exchange with the Bluetooth headset for implementing a Bluetooth video call. The present invention implements the Bluetooth video call by modifying software, thereby using the current hardware resources and decreasing the cost.