HDMI Audio Output Routing for Mixed 2ch and 5.1ch Playback
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Solution Overview
Problem
Conventional audio-visual systems fail to fully utilize the audio reproduction abilities of AV amplifiers when TVs and speakers with different channel capacities are located in different rooms, leading to suboptimal audio transmission.
Innovation Solution
An audio device with multiple output terminals that stores and processes audio reproduction ability information to dynamically adjust audio signals according to the capabilities of connected devices, performing down-mixing and dynamic range compression to ensure optimal audio output across devices with varying channel counts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the source device transmits audio data in conformity with the TV's channel count (2ch), then the TV can reproduce audio correctly, but the AV amplifier's audio reproduction ability (5.1ch) cannot be fully utilized
Solution Approach 1:
The audio signal is segmented and routed to different output terminals based on the connected devices' capabilities. The audio device divides the audio processing into multiple paths: one path processes audio for the TV (2ch), another path processes audio for the AV amplifier (5.1ch), allowing each device to receive audio data appropriate to its reproduction ability while fully utilizing the AV amplifier's capabilities
Solution Approach 2:
The audio device acts as an intermediary between the source device and multiple sink devices (TV and AV amplifier). It receives audio data from the source device and redistributes it to different outputs based on EDID information, mediating the mismatch between the source device's transmission capability and the different reproduction abilities of connected devices
2Reliability
If the source device receives EDID information from the TV, then audio data is transmitted in 2ch format compatible with the TV, but the AV amplifier cannot receive high-quality 5.1ch audio data
Solution Approach 1:
The audio device provides multi-functionality by serving multiple output purposes simultaneously. It can output audio in different channel configurations (2ch, 5.1ch) to different terminals based on device capabilities, making a single audio device universally compatible with various audio reproduction scenarios without sacrificing the ability to provide high-quality multi-channel audio
Data Source
AI summary
An audio device (e.g. an AV amplifier), with a plurality of audio output terminals according to the HDMI standard, converts audio data of a source device into audio signals suited to audio reproduction abilities (e.g. channel counts) of sink devices. The audio device stores a plurality of audio reproduction ability information describing the predetermined channel count thereof and the channel counts of sink devices, wherein arbitrary audio reproduction ability information precluding audio reproduction ability information of a sink device with the smallest channel count is provided to a source device. The audio device performs down-mixing on audio signals with respect to a sink device whose channel count is smaller than the predetermined channel count, whilst the audio device performs signal processing on audio signals with respect to a sink device whose channel count is larger than the predetermined channel count.