A method to encode audio signals is provided for use with an audio capture device that includes multiple microphones having a spatial arrangement on the device, a method to encode audio signals comprising: receiving multiple microphone signals corresponding to the multiple microphones; determining a number and directions of arrival of directional audio sources represented in the one or more microphone signals; determining one of an active microphone signal component and a passive microphone signal component, based upon the determined number and directions of arrival; determining the other of the active microphone signal component and the passive microphone signal component, based upon the determined one of the active input spatial audio signal component and the passive input spatial audio signal component; encoding the active microphone signal component; encoding the passive microphone signal component.

An apparatus includes a receiver and an up-mixer. The receiver is configured to receive a bitstream that includes an encoded mid signal and encoded stereo parameter information. The encoded stereo parameter information represents a first value of a stereo parameter and a second value of the stereo parameter. The first value is associated with a first frequency range. The second value is associated with a second frequency range that is distinct from the first frequency range. The up-mixer is configured to perform an up-mix operation on a frequency-domain decoded mid signal generated from the encoded mid signal. A particular value based on the first value and the second value is applied to the frequency-domain decoded mid signal during the up-mix operation.

An electronic apparatus is provided. The electronic apparatus includes a communication interface; a display; an internal speaker; and a processor configured to control the internal speaker to generate a first audio signal and control the communication interface to transmit a signal to control an external audio device to generate a second audio signal that is synchronized with the first audio signal. The processor is configured to: obtain a first processing time regarding the first audio signal and a second processing time regarding the second audio signal; and control the internal speaker and the communication interface based on the first processing time and the second processing time so that a difference between a first output timing of the first audio signal and a second output timing of the second audio signal is less than a predetermined value.

A method for processing music audio data, including providing input audio data representing a first piece of music comprising a mixture of musical timbres. The method also includes decomposing the input audio data to generate at least first-timbre decomposed data representing a first timbre selected from the musical timbres of the first piece of music, and second-timbre decomposed data representing a second timbre selected from the musical timbres of the first piece of music. The method also includes applying a transport control to obtain transport controlled first-timbre decomposed data. The method also includes recombining audio data obtained from the transport controlled first-timbre decomposed data with audio data obtained from the second-timbre decomposed data to obtain recombined audio data.

There is provided encoding and decoding methods for encoding and decoding of object based audio. An exemplary encoding method includes inter alia calculating M downmix signals by forming combinations of N audio objects, wherein M≤N, and calculating parameters which allow reconstruction of a set of audio objects formed on basis of the N audio objects from the M downmix signals. The calculation of the M downmix signals is made according to a criterion which is independent of any loudspeaker configuration.

A device for performing a hearing test on a test subject having a processing resource configured to: provide audio stimulus signals for an audio output device thereby to provide an audio stimulus to the test subject, wherein the audio stimulus signals are processed such that the provided audio stimulus has a simulated source location; obtain directional response data representative of a response of the test subject to the audio stimulus; process the obtained directional response data as part of determining the hearing ability of the test subject.

An acoustic device includes: a generating unit that generates a monaural signal on the basis of a left stereo signal and a right stereo signal in a low frequency band; an extracting unit that extracts a stereo component for an L-channel and a stereo component for an R-channel on the basis of a left stereo signal and a right stereo signal in a high frequency band; a first combining unit that combines the monaural signal and the stereo component for the L-channel; and a second combining unit that combines the monaural signal and the stereo component for the R-channel.

An apparatus for spatial audio signal processing, the apparatus including at least one processor and at least one memory including a computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: receive audio signals from a microphone array, the microphone array including three or more microphones forming a geometry with defined displacements between pairs of the three or more microphones; determine delay information between audio signals associated with the pairs of the three or more microphones; determine an operator based on the geometry with defined displacements between the pairs of the three or more microphones; apply the operator to the delay information to generate at least one direction parameter associated with the audio signals.

A device for processing audio signals, including: first and second input units providing first and second input signals of first and second audio tracks, a decomposition unit to decompose the first input audio signal to obtain a plurality of decomposed signals, a playback unit configured to start playback of a first output signal obtained from recombining at least a first decomposed signal at a first volume level with a second decomposed signal at a second volume level, such that the first output signal substantially equals the first input signal, and a transition unit for performing a transition between playback of the first output signal and playback of a second output signal obtained from the second input signal. The transition unit has a volume control section adapted for reducing the first and second volume levels according to first and second transition functions.

Embodiments relate to audio processing for opposite facing speaker configurations that results in multiple optimal listening regions around the speakers. A system includes a left speaker and a right speaker in an opposite facing speaker configuration, and a crosstalk cancellation processor connected with the left speaker and the right speaker. The crosstalk cancellation processor applies a crosstalk cancellation to an input audio signal to generate left and right output channels. The left output channel is provided to the left speaker and the right output channel is provided to the right speaker to generate sound including multiple crosstalk cancelled listening regions that are spaced apart.