Audio Processing Device Frequency Band Separation Noise
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Solution Overview
Problem
In environments where external noise and vibration interfere, existing audio communication systems struggle to clearly transmit information by suppressing higher frequency bands, leading to incomplete data transmission and potential user discomfort due to prolonged inaudible signals.
Innovation Solution
An audio processing device that extracts identification information from a first audio signal in a lower frequency band and generates a second audio signal in a higher frequency band, allowing for the transmission of identification information via audio communication without disrupting the existing system, even in noisy environments, by emitting the second audio signal for a longer duration than the identification information within the first signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If higher frequency bands are suppressed in audio signals, then clarity of voice guidance is improved, but transmission of identification information via audio communication is lost
Solution Approach 1:
The patent transmits identification information in the temporal dimension (time domain) rather than relying solely on the frequency dimension. By spreading identification information across multiple time slots and using repetition coding, the system compensates for the loss of high-frequency content while maintaining voice clarity in the suppressed frequency bands.
Solution Approach 2:
The patent changes the transmission parameters of identification information by using lower frequency bands that are not suppressed, and compensates through increased transmission duration and repetition. This parameter transformation allows identification information to be conveyed through channels that remain open after frequency suppression.
2Loss of information
If audio communication uses high frequency bands, then information transmission capability is improved, but user comfort deteriorates due to inaudible signals in noisy environments
Solution Approach 1:
The patent transforms the frequency parameter of identification information from high frequency (inaudible) to low frequency (audible and robust against noise). By modulating identification information onto lower frequency carriers and using time-spreading techniques, the system makes signals audible and resilient to external noise while maintaining transmission capability.
Solution Approach 2:
The patent converts the limitation of frequency suppression (which removes inaudible high frequencies) into a benefit by designing the identification information transmission to deliberately use the same suppressed frequency characteristics but in a controlled manner, then compensating through time-domain repetition so that the overall effect is robust transmission without annoying high-frequency noise.
3Adaptability or versatility
If identification information is transmitted in suppressed frequency bands, then audio communication functionality is maintained, but transmission reliability decreases in noisy environments
Solution Approach 1:
The patent applies error correction coding and repetition coding in advance before transmission. By pre-encoding identification information with redundancy and spreading it across multiple time slots, the system prepares the signal to withstand noise and frequency suppression, ensuring reliable reception even in challenging acoustic environments.
Solution Approach 2:
The patent uses periodic repetition of identification information across multiple time slots. By transmitting the same information repeatedly at different time intervals, the system increases the probability that at least one instance will be received correctly despite noise or frequency suppression, thereby enhancing transmission reliability.
Data Source
AI summary
An audio processing device has an information extractor that extracts identification information from a first audio signal in a first frequency band that includes an audio component of a sound for reproduction and an audio component including the identification information of the sound for reproduction and a signal processor that generates a second audio signal that includes the identification information extracted by the information extractor and that is in a second frequency band higher than the first frequency band, with a sound represented by the second audio signal being emitted from a sound emission device.