Methods of operating a system of nodes are provided. A method of operating first and second nodes that are in a system of nodes includes processing first data from a first plurality of sensors of the first node. The method includes controlling a first digital display of the first node in response to the processed first data. The method includes uploading the processed first data from the first node via the Internet. The method includes processing second data from a second plurality of sensors of the second node. The method includes controlling a second digital display of the second node in response to the processed second data. The method includes uploading the processed second data from the second node via the Internet. Each of the first and second nodes is attached to a utility pole, a light pole, a kiosk, or a motor vehicle. Related systems are also provided.

Methods of operating a system of nodes are provided. A method of operating first and second nodes that are in a system of nodes includes processing first data from a first plurality of sensors of the first node. The method includes controlling a first digital display of the first node in response to the processed first data. The method includes uploading the processed first data from the first node via the Internet. The method includes processing second data from a second plurality of sensors of the second node. The method includes controlling a second digital display of the second node in response to the processed second data. The method includes uploading the processed second data from the second node via the Internet. Each of the first and second nodes is attached to a utility pole, a light pole, a kiosk, or a motor vehicle. Related systems are also provided.

A system includes one or more computing devices that decorrelates a monaural channel into a plurality of output channels. A computing device determines a target amplitude response defining one or more constraints on a summation of the plurality of channels. The target amplitude response is defined by relationships between amplitude values of the summation and frequency values of the summation. The computing device determines a transfer function of a single-input, multi-output all pass filter based on the target amplitude response and determines coefficients of the allpass filter based on the transfer function. The computing devices processes the monaural channel with the coefficients of the allpass filter to generate the plurality of channels.

A system includes one or more computing devices that decorrelates a monaural channel into a plurality of output channels. A computing device determines a target amplitude response defining one or more constraints on a summation of the plurality of channels. The target amplitude response is defined by relationships between amplitude values of the summation and frequency values of the summation. The computing device determines a transfer function of a single-input, multi-output all pass filter based on the target amplitude response and determines coefficients of the allpass filter based on the transfer function. The computing devices processes the monaural channel with the coefficients of the allpass filter to generate the plurality of channels.

A system includes one or more computing devices that decorrelates a monaural channel into a plurality of output channels. A computing device determines a target amplitude response defining one or more constraints on a summation of the plurality of channels. The target amplitude response is defined by relationships between amplitude values of the summation and frequency values of the summation. The computing device determines a transfer function of a single-input, multi-output all pass filter based on the target amplitude response and determines coefficients of the allpass filter based on the transfer function. The computing devices processes the monaural channel with the coefficients of the allpass filter to generate the plurality of channels.

A system includes one or more computing devices that decorrelates a monaural channel into a plurality of output channels. A computing device determines a target amplitude response defining one or more constraints on a summation of the plurality of channels. The target amplitude response is defined by relationships between amplitude values of the summation and frequency values of the summation. The computing device determines a transfer function of a single-input, multi-output all pass filter based on the target amplitude response and determines coefficients of the allpass filter based on the transfer function. The computing devices processes the monaural channel with the coefficients of the allpass filter to generate the plurality of channels.

Methods and systems encoding a stereo audio signal having an original left channel and an original right channel are disclosed. The method includes generating a downmix signal and a residual signal based on the stereo audio signal and determining one or more stereo parameters based on the stereo audio signal. The residual signal covers only a part of an audio frequency range of the stereo signal, and the one or more stereo parameters describing a stereo image of the stereo audio signal. The method further includes analyzing the stereo audio signal and selecting, based on the analyzing, left/right perceptual encoding or mid/side perceptual encoding in a time variant manner.

Methods and systems encoding a stereo audio signal having an original left channel and an original right channel are disclosed. The method includes generating a downmix signal and a residual signal based on the stereo audio signal and determining one or more stereo parameters based on the stereo audio signal. The residual signal covers only a part of an audio frequency range of the stereo signal, and the one or more stereo parameters describing a stereo image of the stereo audio signal. The method further includes analyzing the stereo audio signal and selecting, based on the analyzing, left/right perceptual encoding or mid/side perceptual encoding in a time variant manner.

Embodiments are described for a method of rendering audio for playback through headphones comprising receiving digital audio content, receiving binaural rendering metadata generated by an authoring tool processing the received digital audio content, receiving playback metadata generated by a playback device, and combining the binaural rendering metadata and playback metadata to optimize playback of the digital audio content through the headphones.

Methods for generating an object based audio program, renderable in a personalizable manner, and including a bed of speaker channels renderable in the absence of selection of other program content (e.g., to provide a default full range audio experience). Other embodiments include steps of delivering, decoding, and/or rendering such a program. Rendering of content of the bed, or of a selected mix of other content of the program, may provide an immersive experience. The program may include multiple object channels (e.g., object channels indicative of user-selectable and user-configurable objects), the bed of speaker channels, and other speaker channels. Another aspect is an audio processing unit (e.g., encoder or decoder) configured to perform, or which includes a buffer memory which stores at least one frame (or other segment) of an object based audio program (or bitstream thereof) generated in accordance with, any embodiment of the method.