System and method for emitting and especially controlling an audio signal in an environment using an objective intelligibility measure
First Claim
1. A system for emitting an audio signal in an environment, the system comprising:
- an audio source for providing the audio signal,at least one loudspeaker for emitting the audio signal,at least one microphone for receiving an acoustic signal from the environment, whereby the acoustic signal is based on the audio signal and may comprise disturbing components,an analyzing module for analyzing the acoustic signal and for providing an intelligibility measure from an objective intelligibility measure method whereby the intelligibility measure is used as a feedback signal,an automatic volume control having a control loop and that controls the volume or the energy of the audio signal emitted by the at least one loudspeaker using the intelligibility measure as the feedback signal in the control loop, andrepeating module that repeats the audio signal in case the intelligibility measure is worse than a pre-defined value or threshold.
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Abstract
Public address systems or other systems for emitting audio signals, like music, speech or announcements, in different locations like supermarkets, schools, universities, and auditoriums are widely known. In one embodiment, invention proposes a system for emitting an audio signal in an environment. The system includes an audio source for providing the audio signal and at least one loudspeaker for emitting the audio signal. The system also includes at least one microphone for receiving an acoustic signal from the environment. The acoustic signal is based on the audio signal and may comprise disturbing components. The system also includes an analyzing module for analyzing the acoustic signal and for providing an intelligibility measure from an objective intelligibility measure method. The intelligibility measure is used as a feedback signal.
27 Citations
20 Claims
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1. A system for emitting an audio signal in an environment, the system comprising:
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an audio source for providing the audio signal, at least one loudspeaker for emitting the audio signal, at least one microphone for receiving an acoustic signal from the environment, whereby the acoustic signal is based on the audio signal and may comprise disturbing components, an analyzing module for analyzing the acoustic signal and for providing an intelligibility measure from an objective intelligibility measure method whereby the intelligibility measure is used as a feedback signal, an automatic volume control having a control loop and that controls the volume or the energy of the audio signal emitted by the at least one loudspeaker using the intelligibility measure as the feedback signal in the control loop, and repeating module that repeats the audio signal in case the intelligibility measure is worse than a pre-defined value or threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20)
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18. A system for emitting an audio signal in an environment, the system comprising:
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an audio source for providing the audio signal, at least one loudspeaker for emitting the audio signal, at least one microphone for receiving an acoustic signal from the environment, whereby the acoustic signal is based on the audio signal and may comprise disturbing components, an analyzing module for analyzing the acoustic signal and for providing an intelligibility measure from an objective intelligibility measure method whereby the intelligibility measure is used as a feedback signal, an automatic volume control having a control loop and that controls the volume or the energy of the audio signal emitted by the at least one loudspeaker using the intelligibility measure as the feedback signal in the control loop, and a repeating module that repeats the audio signal in case the intelligibility measure is worse than a pre-defined value or threshold, wherein the repeating module determines whether to repeat the audio signal based on an analysis of the intelligibility measure, wherein the analysis of the intelligibility measure includes determining whether a total number of unintelligible frames included in the audio signal exceeds a predetermined threshold, and wherein the repeating module repeats the audio signal when the predetermined threshold is exceeded.
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Specification