Audio Signal Output Device Channel Identification via Quantization Bit Expansion
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Solution Overview
Problem
Existing audio signal processing methods fail to reliably identify channels in audio signals, particularly when the target channel is not always the first sample, leading to potential misidentification.
Innovation Solution
An audio signal output device that acquires and processes multiple channels by expanding the quantization bits and rearranging samples to create a reference bit position difference between channels, allowing for reliable channel identification through downmixing and outputting signals that can be distinguished by receiving devices without separate identification signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If audio signals are downmixed by arranging samples in sequence without quantization bit expansion, then the signal transmission is simple, but channel identification becomes unreliable when the target channel is not always the first sample
Solution Approach 1:
The patent introduces a new dimension (quantization bit position) to differentiate channels. Instead of relying solely on temporal sequence (which fails when target channel is not first), the invention expands quantization bits to create distinct reference bit positions for different channels, allowing receivers to identify channels by their bit position rather than temporal order.
Solution Approach 2:
The patent changes the quantization bit parameter to solve the identification problem. By expanding the number of quantization bits and assigning different reference bit positions to different channels, the system creates a reliable identification mechanism that works regardless of channel sequence in the downmixed signal.
2Reliability
If quantization bits are expanded to create reference bit position differences, then channel identification becomes reliable, but the data amount and processing load increase
Solution Approach 1:
The patent performs quantization bit expansion as a preliminary action during signal encoding. By pre-expanding the bits and embedding channel identification information in the reference bit positions before transmission, the system enables reliable channel identification at the receiver without requiring additional identification data or increasing processing load during playback.
Solution Approach 2:
The expanded quantization bits serve dual purposes: they maintain audio signal quality while simultaneously providing channel identification information. The reference bit positions within the expanded quantization structure automatically indicate channel identity, allowing the signal itself to carry its own identification metadata without requiring separate data streams.
Data Source
AI summary
An audio signal output device includes an audio signal acquisition unit configured to acquire audio signals of a plurality of channels, a first electronic controller, and an output unit. The first electronic controller includes a quantization bit expansion unit configured to expand the number of quantization bits of each of the audio signals to generate an expansion region for each of the audio signals, and an audio signal processing unit configured to generate an output signal in which the plurality of channels are downmixed such that an audio signal of at least one channel from among the plurality of channels is arranged at a reference bit position different from a reference bit position for an audio signal of a different channel of the plurality of channels, by using the expansion region. The output unit is configured to output the output signal.