Device for indicating a probability that a received signal is a speech signal
First Claim
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1. An audio device for processing a received audio signal, said audio device comprising:
- a speech signal discrimination arrangement; and
means for processing the received audio signal dependent on a probability indication signal generated by the speech signal discrimination arrangement;
said speech signal discrimination arrangement comprising;
an analyzing circuit for deriving an analysis signal indicative of a ratio between a signal power in a first portion of a frequency spectrum of the received audio signal and a signal power in a second portion of the frequency spectrum of the received audio signal;
a first signal pattern detector for detecting first and second signal patterns in the analysis signal, said first and second signal patterns each having a probability of occurrence in a speech signal that is greater than a probability of occurrence in another signal which is not a speech signal, said first signal patterns being a plurality of briefly succeeding rapid changes in the power ratio, each occurring within a given maximum time, and said second signal patterns being a temporary decrease of the power ratio below a given lower threshold for a given period of time; and
estimator means for deriving the probability indication signal based on the detection of the first and second signal patterns.
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Abstract
A probability indication signal VP indicates the probability that the audio signal received via the input is a speech signal. An analyzing circuit derives (NA) which is indicative of the ratio between a signal power in a first portion of a frequency spectrum of the received signal and a signal power in a second portion of the frequency spectrum. A signal pattern detector detects signal patterns in the analysis signal (NA) in another signal, for example, a music signal. An estimator derives the probability indication signal VP in dependence on the detected signal patterns.
95 Citations
10 Claims
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1. An audio device for processing a received audio signal, said audio device comprising:
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a speech signal discrimination arrangement; and means for processing the received audio signal dependent on a probability indication signal generated by the speech signal discrimination arrangement; said speech signal discrimination arrangement comprising; an analyzing circuit for deriving an analysis signal indicative of a ratio between a signal power in a first portion of a frequency spectrum of the received audio signal and a signal power in a second portion of the frequency spectrum of the received audio signal; a first signal pattern detector for detecting first and second signal patterns in the analysis signal, said first and second signal patterns each having a probability of occurrence in a speech signal that is greater than a probability of occurrence in another signal which is not a speech signal, said first signal patterns being a plurality of briefly succeeding rapid changes in the power ratio, each occurring within a given maximum time, and said second signal patterns being a temporary decrease of the power ratio below a given lower threshold for a given period of time; and estimator means for deriving the probability indication signal based on the detection of the first and second signal patterns. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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2. A speech signal discrimination arrangement having an input for receiving an audio signal and an output for supplying a probability indication signal which is indicative of the probability that the audio signal received via the input is a speech signal, the arrangement comprising:
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an analyzing circuit for deriving an analysis signal which is indicative of a ratio between a signal power in a first portion of a frequency spectrum of the received audio signal and a signal power in a second portion of the frequency spectrum of the received audio signal; a first signal pattern detector for detecting first and second signal patterns in the analysis signal, said first and second signal patterns each having a probability of occurrence in a speech signal that is greater than a probability of occurrence in another signal which is not a speech signal, said first signal patterns being a plurality of briefly succeeding rapid changes in the power ratio, each occurring within a given maximum time, and said second signal patterns being a temporary decrease of the power ratio below a given lower threshold for a given period of time; and estimator means for deriving the probability indication signal based on the detection of the first and second signal patterns.
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Specification