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.

Hybrid analog/digital STB

Abstract: A hybrid analog/digital STB includes a tuner supplying respective analog and digital television signal processing paths. The analog processing path provides demodulated composite analog video and audio signals and the digital processing path provides demodulated component digital video and audio signals. The demodulated analog and video signals are combined in composite or component form to achieve various desirable effects in a highly flexible system architecture. OSD and display map normalization functions are also integrated within the system architecture.

Docking station for portable electronic devices

Abstract: A docking station apparatus interfaces a portable electronic device with one or more electrical systems of a vehicle. The apparatus includes a docking assembly having an internal cavity and configured to hold the electronic device, and a mechanical interface in the cavity and configured to provide a wired or wireless connection to the electronic device. A power supply conversion circuit translates vehicle power levels to electronic device power levels, and one or more support circuits or connectors provide different connectivity functions for the electronic device. The support circuits or connectors can include input audio/video connectors in the docking assembly to provide analog audio/video signals to an analog distribution hub; an audio/video encoder and digital data connectors to provide digitally encoded audio/video signals in a wired or wireless mode to a digital distribution hub; multiplexing circuitry to accept analog audio, composite video, or component video for multiplexing between externally supplied audio/video and locally generated audio/video; and a command and control circuit to provide command and control data, and navigation data, to the electronic device in a wired or wireless mode.

Audio signal processing system having independent and distinct data buses for concurrently transferring audio signal data to provide acoustic control

Abstract: An audio signal data processing system comprises input device for sequentially supplying an audio signal data, data memory control device for writing the audio signal data into a data memory and reading-out the data from the data memory, delay memory control device for sequentially reading-out the audio signal data from the data memory and storing the data into a location of a delay memory indicated by a writing address and for reading-out the audio signal data from a location of the delay memory indicated by a reading address and writing the data into the data memory, address designating devices for designating the writing and reading addresses, arithmetic device for multiplying a predetermined coefficient data to the audio signal data having been read-out by the delay memory control device and written into the data memory, and output device for providing the audio signal data in accordance with a result of operation by the arithmetic device. The data memory control device and the delay memory control device write and read the audio signal data into and from the data memory through data buses independent from each other.

Distributed audio collaboration method and apparatus

Abstract: An Internet based music collaboration system is disclosed in which musicians and/or vocalists at client locations transmit audio signals to a server location where the audio signals are combined into a composite musical work and sent back to each of the client locations. The work may be sent back as a composite musical signal which is the concatenation of all individual audio signals or as a mix of audio signals.

Audio-digital processing system for demultiplexing stereophonic/quadriphonic input audio signals into 4-to-72 output audio signals

Abstract: An audio-digital processing system for processing and converting audio localization data from stereophonic or quadriphonic input audio signals into digital localization data. Said digital localization data is further processed into digital commutation data which demultiplexes said stereophonic or quadriphonic input audio signals into 4 . . . 16 . . . 72 output audio signals. This system includes an Input Audio Processor and a Psychoacoustic Data Converter that process and convert each audio field of audio localization data into digital localization data, comprising: digital phase-angle differential, phasor differential, and amplitude differential data; digital field activity, threshold, and dropout data; and digital peak-amplitude strobes. Each type of digital localization data is updated in a corresponding memory for each change in the associated audio localization data. Each corresponding memory is enabled, inhibited, or cleared by respective digital threshold and/or dropout data which are responsive to predetermined audio signal-to-noise amplitude relationships. This system also includes a Psychoacoustic Data Processor that processes each type of updated digital localization data into digital commutation data (a digital psychoacoustic process analogous to binaural fusion). This digital psychoacoustic process functions to: execute and priority evaluate demultiplexing decisions for each output audio field; restore the reproduced sound to near infinite separation; resolve monophonic, stereophonic, and quadriphonic directional ambiguities; and provide preselectable quadrifield operations that create permutations of listening experiences previously unobtainable from the same recording. These preselectable quadrifield operations function to create 16 selectable listening formats that interchange the original panpotted musical instrument/voice positions to other predetermined transducer positions; sequentially reposition, or continuously swirl the discrete sound images in the 360-degree quadrifield; and preselect 4 . . . 16 . . . 72 output audio channels to match the number of transducers configured by the listener. This system further includes an Output Audio Processor that processes said stereophonic or quadriphonic input audio signals into output audio signals. The output audio signals are processed in accordance with the preselectable quadrifield operations into one or more of the following: discrete direct audio signals, a system bass signal that automatically tracks the Fletcher-Munson equal loudness contours, recovered/synthesized concert hall ambience signals, rear matrix encoded audio signals, recovered direct audio signals when rear matrix encoded audio signals predominate, and recovered rear matrix encoded audio signals when discrete direct audio signals predominate. This system includes a Psychoacoustic Audio Demultiplexer that demultiplexes, in response to said digital commutation data, said output audio signals into 4, 5, 6, 8, 10, 12, 14, 16 . . . 72 preselected output audio channels and associated configuration of transducers. The demultiplexed and point-source reproduced discrete sound images establish a 360-degree walkthrough quadrifield that eliminates the stereophonic/qaudriphonic seat; a consumer problem initiated in 1924 and defying practical solution since the first commercial stereophonic tape recording in 1954 or disc recording in 1958.