116 results about "Public address system" patented technology

A sound field controlling apparatus for a public-address system comprises a microphone that picks up a sound of a speaker, a loudspeaker that sound a sound signal based on the sound picked up by the microphone, a sound source position detector that detects a position of a sound source, and a signal processor that controls a level, delay time and equalizing property of the sound signal output to the loudspeaker in accordance with the sound source position detected by the sound source position detector.

Methods and apparatus for maximizing speech intelligibility use psycho-acoustic variables of a model of speech perception to control the determination of optimal frequency-band specific gain adjustments. Speech signals (or other audio input) whose intelligibility is to be improved are characterized by parameters which are applied to the model. These include measurements or estimates of speech intensity level, average noise spectrum of the incoming audio signal, and/or the current frequency-gain characteristic of the hearing compensation device. Characterizations of listeners based on hearing test results, for example, may also be applied to the model. Frequency-band specific gain adjustments generated by use of the model can be used for hearing aids, assistive listening devices, telephones, cellular telephones, or other speech delivery systems, personal music delivery systems, public-address systems, sound systems, speech generating systems, or other devices or mediums which project, transfer or assist in the detection or recognition of speech.

The invention relates to an audio processing system for processing an input sound to an output sound. The invention further relates to a method of estimating a feedback transfer function in an audio processing system. The object of the present invention is to provide an alternative scheme for minimizing feedback in audio processing systems. The problem is solved in that the audio processing system comprises an input transducer for converting an input sound to an electric input signal and defining an input side, an output transducer for converting a processed electric output signal to an output sound and defining an output side, a forward path being defined between the input transducer and the output transducer, and comprising a signal processing unit adapted for processing an SPU-input signal originating from the electric input signal and to provide a processed SPU-output signal, and an electric feedback loop from the output side to the input side comprising a feedback path estimation unit for estimating an acoustic feedback transfer function from the output transducer to the input transducer, and a enhancement unit for estimating noise-like signal components in the electric signal of the forward path and providing a noise signal estimate output, wherein the feedback path estimation unit is adapted to use the noise signal estimate output in the estimation of the acoustic feedback transfer function. This has the advantage of providing an adaptive feedback cancellation system which is robust in situations with a high degree of correlation between the output signal and the input signal of an audio processing system, e.g. a listening device. The invention may e.g. be used in public address systems, entertainment systems, hearing aids, head sets, mobile phones, wearable/portable communication devices, etc.

A system and method for effectively utilizing a recorder device includes a timecode generator that generates timecode for synchronizing electronic information. A transceiver of the recorder device wirelessly transmits the timecode to a plurality of cameras. The cameras capture video data and audio data, and timecode managers of the respective cameras combine the received timecode with the captured video data and audio data to produce camera data. The cameras then wirelessly transmit the camera data to the recorder device for storage in a recorder memory. The recorder device may also receive and store PA audio data from a public address system. Furthermore, a computer device may communicate with the recorder device to perform various types of editing procedures on the stored camera data and PA data to produce edited data.

The invention relates to a public address system including one or more loudspeakers, each of which is in particular equipped with a section for reproducing high-frequency sounds, including a wave expansion guide, which receives, at its input sound waves coming from a transducer and having, projecting in a plane, a form opening outwards from its input to its output for distributing, in a solid transmission angle, the sound waves coming from the expansion guide. According to the invention, the expansion guide includes one or more mobile flaps that can be moved by a movement made parallel to the plane, so as to enable the solid transmission angle of the sound waves to be adjusted.

A system and method is discussed for targeting a message to an intended listener over a public announcement system by selecting a single broadcast location, such as a speaker, from a plurality of broadcast locations. A typical method for locating a listener uses a method of triangulation of a wireless device located on the listener. A broadcast location is selected from distance calculations that determine which broadcast location is closest to the listener. Each broadcast location has an associated Internet Protocol (IP) address. The message is delivered to the IP address of the closest broadcast location. Voice over Internet Protocol (VoIP) technology can be used to selectively deliver the message.

A system and method that use audio feedback from a region being monitored can provide location information pertaining to fire or individuals in the region. Units of a public address system can each be equipped with a microphone. Audio from the microphones can be processed at a common location, such as an alarm control panel. The audio can provide fire profiles as well as information as to individuals in the region being monitored.

A service that leverages established wireless messaging paradigms such as, possibly inter alia, Short Message Service, Multimedia Message Service, Wireless Application Protocol, and IP Multimedia Subsystem to yield an infrastructure that enhances aspects of a conventional Public Address System (as found at, for example, an airport, a train station, a conference or convention center, a sporting event, a concert, etc.) and allows a Mobile Subscriber to seamlessly employ their Wireless Device to interact with same. The service may optionally leverage the capabilities of a centrally-located Messaging Inter-Carrier Vendor.

The invention is a multi-channel loudspeaker system that provides a compact loudspeaker configuration and filter design methodology that operates in the digital signal processing domain. Further, the loudspeaker system can be designed as a multi-way loudspeaker system comprised of a symmetric arrangement of loudspeaker drivers in a two-dimensional plane and can achieve high-quality sound, constant directivity over a large area in both the vertical and horizontal planes and can be used in connection with stereo loudspeaker systems, multi-channel home entertainment systems and public address systems.

The invention relates to an assistive listening system comprising an audio transmitting device adapted for transmitting an audio signal and/or a control signal to a multitude of receiving listening devices and at least one receiving listening device adapted for receiving said audio signal and said control signal from said audio transmitting device. The invention further relates to a method of operating an assistive listening system and to its use. The object of the present invention is to provide an assistive listening system suitable for servicing a multitude of body worn listening devices in a wireless environment. The problem is solved in that the system is adapted to establish a digital link according to the DECT-standard from the audio transmitting device to the at least one receiving listening device, wherein the system is adapted to provide that said link is uni-directional. The system has the advantage of providing a reliable channel selection in a wireless assistive listening system comprising low power, body worn listening devices. The invention may e.g. be used for public address systems, e.g. educational listening systems, comprising listening devices adapted for being worn by a user.

A method and an audio processing system determine a system parameter, e.g. step size, in an adaptive algorithm, e.g. an adaptive feedback cancellation algorithm so as to provide an alternative scheme for feedback estimation in a multi-microphone audio processing system. A feedback part of the system's open loop transfer function is estimated and separated in a transient part and a steady state part, which can be used to control the adaptation rate of the adaptive feedback cancellation algorithm by adjusting the system parameter, e.g. step size parameter, of the algorithm when desired system properties, such as a steady state value or a convergence rate of the feedback, are given/desired. The method can be used for different adaptation algorithms such as LMS, NLMS, RLS, etc. in hearing aids, headsets, handsfree telephone systems, teleconferencing systems, public address systems, etc.

A manned or unmanned aircraft, and equipment aboard the aircraft, are controlled through a cell phone network or other public package switched network. Some of the information downlinked from the aircraft may include video imagery acquired by sensors integrated with the aircraft. In addition, some of the information uplinked to the aircraft may include instructions to control equipment onboard the aircraft, including cameras, spotlights, and public-address systems.

An app for programmable personal mobile communications devices which is useful for people attending meetings, conferences, classrooms and the like is described. The app permits the device to operate as a microphone to address the audience through a local wireless network and the public address system and as an app for meeting functions, such as the queuing of speaker/questioners at the meeting, the handling of audience surveys and nondisclosure agreements, record-keeping at meetings and so forth. Furthermore, different aspects of the app allow a user to operate as a moderator/host of a meeting in one case or as an attendee/participant of the meeting in another.

A system for indicating race position to spectators of a race, includes lights on the race participants that are configured to provide visual displays to the spectators indicating the position of the respective racer. The race participants also carry a receiver and a controller for receiving a signal indicating race position and selecting the appropriate visual display based on the received signal. The visual display can be a series of lights, such as linear arrays of LEDs, where the color, number, pattern and/or position of the lights indicates race position. The system can also be used to highlight selected racers of interest, for example in conjunction with information being relayed over the public address system of the racetrack.

A statistical multiplexing method is provided that comprises accessing a plurality of video sequences, wherein the video sequences are each assigned to a unique channel in a common broadcast system; collecting information from a plurality of the unique channels assigned to encode the corresponding video sequences; applying rho-domain analysis to the video sequences; and determining bitrate allocation for the channels responsive to the information collect and the rho-domain analysis.

The invention discloses a self-excitation eliminating method of a high gain public address system based on space counteracting. Voice signals of amplified frequency components are respectively weighted and then output from a two-path sound box loudspeaker so that two-path output signals mutually cancel out at a microphone. Thus, a microphone loop has extremely high amplification gain by a method of inhibiting the voice output from a sound box from being feeding back to the microphone. On one hand, the method leads the two-path self-excitation signals are voluntarily cancelled out, is dependent of objective signals and does not treat the object signals, and additional inhibition signals are not generated at the same time; and on the other hand, the method cause the signals resulting in squeal to be voluntarily eliminated rather than being filtered from the objective signals, thereby radically solving the self-excitation problem of the microphone.

A public addressing and emergency system has a person or message signal generator for generating a message whose contents comprise at least one of a sign language message, a voice message, and a text message and a transmitting system for transmitting the message signal to at least one of a mobile unit and at least one fixed display unit in at least one location. The message signal transmitting system is bi-directional enabling bi-directional message communication and may include a device such as a splitter for generating multiple signals and/or a device such as a booster for increasing or maintaining the power of the signals. The public addressing system can be independent, or tied in with internal processing of commercial entities and their electronic displays to present advertising and educating the public about the emergency system.

A method for providing dynamically translated public address announcements can begin with a multi-lingual module maintaining a listing of mobile devices that are currently active within a specified geographic area serviced by a public address system. The native language used by a mobile device that is different than a language used by the public address system can be noted. Content for an announcement broadcast by the public address system can be converted into a format capable of being transmitted via a wireless communications message. The converted content can be translated to the native languages noted in the listing. The wireless communications message containing the translated content can be pushed to corresponding mobile devices in the listing and the wireless communications message containing the converted content can be pushed to a remainder of the mobile devices in the listing via a non-cellular wireless network local to the specified geographic area.