Audio Signal Control Information Superimposition for LFE Level Adjustment
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Solution Overview
Problem
Current signal processing systems fail to appropriately process and reproduce multi-channel audio signals due to the loss of sub-information during conversion from Dolby Digital or DTS bit streams, especially when transmitted using IEEE1394 or HDMI, which do not superimpose sub-information on multi-channel signals.
Innovation Solution
A signal processing system that superimposes control information, such as LFE signal reproduction level data, on audio info frames to adjust the playback level of multi-channel linear audio signals, allowing for accurate reproduction by converting the information using extracted control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the original bit stream is decoded and transmitted as multi-channel linear PCM using IEEE1394 or HDMI, then transmission quality is improved, but sub-information is lost and cannot be superimposed on the signal
Solution Approach 1:
The patent separates the audio signal transmission into two independent parts: the multi-channel linear PCM audio data and the control information (sub-information). The control information is packaged in a separate data structure that can be independently transmitted alongside the audio stream, allowing both high-quality audio transmission and preservation of control data without interference between them.
Solution Approach 2:
The patent introduces an intermediary data structure that carries control information separately from the audio bit stream. This intermediary structure acts as a mediator that preserves sub-information (such as LFE level control data) while allowing the audio signal to be transmitted in high-quality linear PCM format through IEEE1394 or HDMI interfaces.
2Device complexity
If control information is not superimposed on the multi-channel signal, then signal transmission is simplified, but appropriate processing cannot be carried out during decoding and reproduction
Solution Approach 1:
The patent applies preliminary action by embedding control information in a structured data format before transmission. This pre-packaging of control data (such as LFE level information) allows the receiving device to perform appropriate processing during decoding and reproduction without adding complexity to the transmission path. The control information is prepared in advance in a format that facilitates easy extraction and application.
Data Source
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AI summary
A signal processing system is provided, which includes a first converter for converting first information in to second information, a superimposer for superimposing on the second information control information corresponding to any missing information lost from the first information due to its conversion by the first converter. Furthermore, the signal processing system includes a transmitter for transmitting the second information, a receiver for receiving the second information transmitted from the transmitter, and an extractor for extracting the control information from the second information. The signal processing system also includes a second converter for converting the second information in to third information based on the control information extracted by the extractor, and an output portion for outputting the third information, wherein the second converter is configured to adjust a low frequency effect (LFE) signal reproduction level in a multichannel linear audio signal based on the control information.