Audio Decoder Metadata for Dynamic Range and Guided Clipping Control
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Solution Overview
Problem
Conventional audio decoding technologies face challenges in effectively managing dynamic range compression and guided clipping prevention, leading to potential signal clipping and increased computational complexity due to the lack of encoder-side control over clipping prevention mechanisms.
Innovation Solution
An audio encoder and decoder system that incorporates dynamic range control gain sequences and guided clipping prevention gain sequences into a metadata bitstream, allowing for encoder-side control of dynamic range compression and clipping prevention, thereby reducing the need for decoder-side peak limiters and minimizing computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If decoder-side peak limiters are used for clipping prevention, then signal clipping is prevented, but computational complexity increases
Solution Approach 1:
The patent applies preliminary action by computing clipping prevention gain sequences at the encoder side and embedding them in the bitstream before decoding. The decoder simply applies these pre-computed gains without performing complex peak limiting calculations, thus preventing clipping while reducing computational complexity at the decoder.
Solution Approach 2:
The patent extracts the computationally intensive clipping prevention calculations from the decoder side and relocates them to the encoder side. The encoder computes and embeds the necessary gain sequences in the metadata, allowing the decoder to avoid complex real-time clipping detection and correction operations.
2Device complexity
If encoder-side control of clipping prevention is implemented, then computational load at decoder is reduced, but metadata bitstream size increases
Solution Approach 1:
The patent applies parameter changes by representing clipping prevention gains in a compressed format using scale factors and offset values rather than full-precision floating-point numbers. This reduces the metadata size while preserving the essential clipping prevention functionality.
Solution Approach 2:
The patent applies partial action by providing clipping prevention gains only for specific critical frames or time segments rather than for every frame. This selective approach reduces the overall metadata size while maintaining effective clipping prevention where most needed.
3Adaptability or versatility
If dynamic range compression and clipping prevention are handled separately, then processing flexibility is maintained, but device complexity increases
Solution Approach 1:
The patent merges dynamic range compression and clipping prevention into a unified processing framework where both functions operate on the same audio signal path with coordinated gain application. The metadata structure integrates both DRC and clipping prevention parameters, allowing synchronized processing while maintaining the distinct functional characteristics of each operation.
Data Source
AI summary
The invention provides a concept for combined dynamic range compression and guided clipping prevention for audio devices. An audio decoder for decoding an audio bitstream and a metadata bitstream related to the audio bitstream according to the concept includes an audio processing chain including a plurality of adjustment stages including a dynamic range control stage for adjusting a dynamic range of the audio output signal and a guided clipping prevention stage for preventing clipping of the audio output signal; and a metadata decoder configured to receive the metadata bitstream and to extract dynamic range control gain sequences and guided clipping prevention gain sequences from the metadata bitstream, at least a part of the dynamic range control gain sequences being supplied to the dynamic range control stage, and at least a part of the guided clipping prevention gain sequences being supplied to the guided clipping prevention stage.