Compressed Audio Transmission Metadata for High-Rate Playback
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Solution Overview
Problem
The existing standards for transmitting compressed digital audio signals, such as MPEG-4 AAC, face challenges when dealing with high data rates, particularly when the sampling frequency exceeds 48 kHz, leading to incorrect signal conversion and misleading user perceptions of audio frequency reproduction.
Innovation Solution
Incorporating metadata indicating the sending frequency, sampling frequency, and their ratio into the compressed digital audio signal, allowing for accurate transmission and reception of high-data-rate signals, enabling correct reproduction at the original sampling frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the sending frequency is increased to 96 kHz to transmit high data rate multichannel audio signals, then the data transmission capacity is improved, but the receiving device incorrectly converts the signal at 96 kHz instead of the original 48 kHz sampling frequency, leading to wrong audio reproduction
Solution Approach 1:
The patent introduces metadata as an intermediary information carrier that conveys the relationship between sending frequency and sampling frequency. The metadata includes a ratio indicator that acts as a mediator, allowing the receiving device to correctly interpret the frequency transformation and perform accurate signal conversion despite the frequency change during transmission.
Solution Approach 2:
The patent changes the frequency parameter during transmission by sending the audio signal at a different frequency than the original sampling frequency. The metadata records the original sampling frequency and the ratio between sending and sampling frequencies, enabling the receiving device to adjust parameters and restore the correct reproduction frequency.
2Productivity
If the sending frequency differs from the sampling frequency to accommodate high data rates, then the transmission capability is improved, but the user is misled into thinking that high-frequency audio (equal to or not less than 24 kHz) is reproduced when it is not
Solution Approach 1:
The metadata serves as an intermediary that preserves the true audio frequency information. By including the sampling frequency and ratio data in the metadata, the system ensures that the actual audio frequency characteristics are not lost during transmission, allowing accurate representation to the user.
Solution Approach 2:
The metadata provides feedback information about the frequency relationship to the receiving device and ultimately to the user interface. This feedback mechanism ensures that the displayed audio frequency information reflects the actual reproduction capabilities rather than the transmission frequency.
Data Source
AI summary
To enable to favorably send a compressed digital audio signal at a high data rate. First, second, and third metadata are added to a compressed digital audio signal of a predetermined number of channels. The first metadata is metadata indicating a sending frequency of the compressed digital audio signal. The second metadata is metadata indicating a sampling frequency used for converting an uncompressed digital audio signal of each channel into an analog signal. The third metadata is metadata indicating a ratio of the sending frequency to the sampling frequency. The compressed digital audio signal provided with each type of the metadata is transmitted to an external device through a predetermined sending path.