Audio signal processing

About: Audio signal processing is a research topic. Over the lifetime, 21463 publications have been published within this topic receiving 319597 citations. The topic is also known as: audio processing & Acoustic signal processing.

Efficient models for reverberation and distance rendering in computer music and virtual audio reality

Abstract: This paper discusses efficient digital signal processing algorithms for real-time synthesis of dynamically controllable, natural-sounding artificial reverberation. A general modular framework is proposed for configuring a spatial sound processing and mixing system according to the reproduction format or setup and the listening conditions, over loudspeakers or headphones. In conclusion, the implementation and applications of a spatial sound processing software are described, and approaches to control interface design and effective distance effects are reviewed.

Programmable sound card for electronic devices

Abstract: A programmable sound card for an electronic apparatus includes at least one read-only detection device adapted for connection to an electronic apparatus, the read-only detection device operative to detect selected event occurrences on an electronic apparatus and output event occurrence notification signals upon detection of an event. The read-only detection devices are connected to an event detection sampling device operative to detect and receive event occurrence notification signals from the detection devices, analyze those signals and output event occurrence information signals including information specifying event occurrences. A programmable event occurrence information signal computing device is connected to the event detection sampling device, the signal computing device operative to receive and analyze event occurrence information signals output by the event detection sampling device and output sound generation command signals for initiating generation of selected sounds by the programmable sound-producing device. Connected with the programmable event occurrence information signal computing device is a read/write audio signal storage memory device operative to store audio signals in retrievable form and access and output selected audio signals in response to reception of sound generation command signals from the programmable event occurrence information signal computing device. Finally, an audio signal output device is connected to the audio signal storage memory device is provided for transferring, converting and outputting the selected audio signals from the read/write audio signal storage memory device to a sound-producing device such as a speaker.

Primary-Ambient Signal Decomposition and Vector-Based Localization for Spatial Audio Coding and Enhancement

Abstract: Spatial audio coding and enhancement address the growing commercial need to store and distribute multichannel audio and to render content optimally on arbitrary reproduction systems. In this paper, we discuss a spatial analysis-synthesis scheme which applies principal component analysis to an STFT-domain representation of the original audio to separate it into primary and ambient components, which are then respectively analyzed for cues that describe the spatial percept of the audio scene on a per-tile basis; these cues are used by the synthesis to render the audio appropriately on the available playback system. The proposed framework can be tailored for robust spatial audio coding, or it can be applied directly to enhancement scenarios where there are no rate constraints on the intermediate spatial data and audio representation.

Performance evaluation of digital audio watermarking algorithms

Abstract: We propose an algorithm-independent framework for rigorously comparing digital watermarking algorithms with respect to bit rate, perceptual quality, computational complexity, and robustness to signal processing. The framework is used to evaluate five audio watermarking algorithms from the literature, revealing that frequency domain techniques perform well under the criteria.

Multi-Modal Audio System With Automatic Usage Mode Detection and Configuration Capability

Abstract: An audio system that may be used in multiple modes or use scenarios, while still providing a user with a desirable level of audio quality and comfort. The inventive system may include multiple components or elements, with the components or elements capable of being used in different configurations depending upon the mode of use. The different configurations provide an optimized user audio experience for multiple modes of use without requiring a user to carry multiple devices or sacrifice the audio quality or features desired for a particular situation. The inventive audio system includes a use mode detection element that enables the system to detect the mode of use, and in response, to be automatically configured for optimal performance for a specific use scenario. This may include, for example, the use of one or more audio processing elements that perform signal processing on the audio signals to implement a variety of desired functions (e.g., noise reduction, echo cancellation, etc.).