42 results about "Room acoustics" patented technology

Transfer functions like Head Related Transfer Functions (HRTF) needed for binaural rendering are implemented efficiently by a subband-domain filter structure. In one implementation, amplitude, fractional-sample delay and phase-correction filters are arranged in cascade with one another and applied to subband signals that represent spectral content of an audio signal in frequency subbands. Other filter structures are also disclosed. These filter structures may be used advantageously in a variety of signal processing applications. A few examples of audio applications include signal bandwidth compression, loudness equalization, room acoustics correction and assisted listening for individuals with hearing impairments.

A device for determining room-optimized transfer functions for a listening room serving for room-optimized post-processing of audio signals in spatial production, is configured to analyze room acoustics of the listening room and to determine, based on the analysis of the room acoustics, the room-optimized transfer functions for the listening room where the spatial reproduction by means of a binaural close-range sound transducer is to take place. The spatial reproduction of the audio signals by means of the binaural close-range sound transducer may then be emulated using known head-related transfer functions und using the room-optimized transfer functions, wherein a room to be synthesized may be emulated based on the head-related transfer functions, and wherein the listening room may be emulated based on the room-optimized transfer functions.

The invention relates to a distance sense synthetic method in three-dimensional sound field synthesis. The method comprises firstly setting reverberation time of a room to be synthesized and the length, the width and the height of the room; or using acoustic pressure levels to measure reverberation time of a room to be replayed and the length, the width and the height of the room; secondly measuring frequency response of a loudspeaker, obtaining a reflection coefficient beta i according to a formula; and finally obtaining corresponding excitation functions of each loudspeaker according to setting position coordinates of each loudspeaker and each sound source. In the formula, P (chi, omega) is sound pressure synthesized in a bounded area V, and Ssw(omega) is a source signal frequency domain expression. Therefore, relation between room acoustics and traditional WFS technology is built, and the excitation function is finally used to enable a three-dimensional sound field to have direction sense and the distance sense.

A method for determining coefficients of a family of cascaded second order Infinite Impulse Response (IIR) parametric filters used for equalizing a room response. The method includes determining parameters of each IIR parametric filter from poles or roots of a reasonably high-order Linear Predictive Coding (LPC) model. The LPC model is able to accurately model the low-frequency room response modes providing better equalization of loudspeaker and room acoustics, particularly at the low frequencies. Advantages of the method include fast and efficient computation of the LPC model using a Levinson-Durbin recursion to solve the normal equations that arise from the least squares formulation. Due to possible band interactions between the cascaded IIR parametric filters, the method further includes optimizing the Q value of each filter to better equalize the room response.

A room acoustic diffuser exploits interference, by reflecting waves out-of-phase with the specular energy, making it possible to diminish specular energy. This is achieved by using a diffuser based on a ternary sequence, which nominally has reflection coefficients of 0, −1 and +1. A method for obtaining the design sequence for Quaternary diffusers is also disclosed. Also, design methods for forming the sequences into arrays, and forming hemispherical diffusers are explained.

A dynamic acoustic locking ceiling baffle and a dynamic acoustic locking ceiling system, that includes a single piece of material folded into acoustic locking ceiling baffles, using locking pieces and locking mechanisms, to quickly and easily install the acoustic locking ceiling baffle onto construction ceiling hangers to provide an aesthetically pleasing image, along with a reduction in unwanted noise or room acoustics.

Speech dereverberation is achieved by accepting an observed signal for initialization (1000) and performing likelihood maximization (2000) which includes Fourier Transforms (4000).

An acoustic paint to be applied to the walls of a room in which a source of audible sound is located to improve the acoustic characteristics of the room and correspondingly improve the clarity (e.g., the warmth, richness and detail) of the sound that is generated by the source and detected by the ear of a listener located within the room. The acoustic paint includes a paint foundation into which is mixed a powdered piezoelectric material or a powdered non-piezoelectric crystalline material having a resonant frequency so that the powdered material will react to the sound generated within the room and thereby control the room acoustics depending upon the type of material and the resonant frequency thereof. An optional catalyst, such as an electrically conductive powdered graphite or powdered graphene, is mixed into the paint foundation. The mixture is stirred and then applied to the walls of the room by means of a brush, a roller, or the like.

A method and speaker system that provides a single, user adjustable tool for controlling how and which spatialization parameters are used in a single speaker multi-driver system to enhance the sound stage. The tool creates the desired amount of audio surround effect to enhance the sound stage experience or effects in multiple sound recording mode, such as music or movies. The tool is represented in a scale that runs from ‘−10’ (less immersive) to ‘+10’ (more immersive) is set to taste by the listener and will vary with room acoustics and placement.

The invention describes an apparatus for software or hardware emulation of acoustic feedback effects. The invention comprises an analog to digital interface (200) for the input, whose output is summed (202) with a feedback of this digital signal passing through an amplifier model (204), a room acoustics model (206) and a string model (210). The summed signal (202) is converted from digital to analog (205) and can then be connected to a standard amplifier. The room acoustic model comprises a volume control (208) where the degree of feedback is controlled, while the string model contains a model (212) of which harmonics to feed back, and finally an algorithm (214) that decides which fundamental frequencies that the incoming digital signal contains.

A dynamic acoustic ceiling baffle and a dynamic acoustic ceiling baffle system, that includes multiple shaped baffles that can be quickly and easily installed onto construction ceiling hangers without the need for additional tools, to provide an aesthetically pleasing image, such as an undulating image, along with a reduction in unwanted noise or room acoustics.

Sound diffusers are important components in enhancing the quality of room acoustics. The present disclosure relates to a sound diffuser obtained by using properties of the cymatics phenomena. Cymatics is the study of sound and vibration made visible, typically on the surface of a plate, diaphragm or membrane. Two examples of diffusers are designed by the cymatic shapes and modeled by using a quadratic quadratic residue sequence. It is found that this type of acoustic diffusers can be used to maintain the acoustic energy in a room and at the same time can treat unwanted echoes and reflections by scattering sound waves in many directions. The design allows for creating different interior space designs by changing the arrangement of the diffuser panels, and this leads to different applications for the diffusers.

A method for assisting a user in selecting audible alarm settings of a patient monitoring system for monitoring a patient is provided. A synthesis model is generated in response to 1) data indicative of audio features derived from audio recorded in the patient room, and 2) data indicative of vital signs recorded from the patient monitoring system. Sets of audio parameters indicative of respective plurality of audible alarm settings are then processed according to the synthesis model so as to generate respective outputs, e.g. indicative of audibility of the plurality of alarm sounds according to the audible alarm settings synthesized to be played in or outside the patient room. These outputs can then be presented to a user, so as to allow the user to evaluate e.g. alarm audibility and noise level impact of the plurality of audible alarm settings, and e.g. adjust the settings accordingly, such as alarm thresholds etc. The synthesis model may comprise an auralization module, so as to generate synthesized audio outputs to the user. The synthesis model may take into account actual room acoustics in or outside the patient room, so as to allow a precise calculation and/or audio synthesis of an alarm sound to be played in the environment. Alternatively, or additionally, the systhesis model can generate objective and/or subjective metrics that allows the user to find a suitable balance between alarm audibility and impact on noise level.

A system for audio processing comprising a room reflection emulation system for emulating sound reflections in a room. A room acoustics emulation system for emulating acoustic properties of the room. A head, shoulder and ear emulation system for emulation sound reflections near the head.