Digital signal processing system and method for a telephony interface apparatus
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Abstract
A signal processing method including the steps of: receiving a first audio signal; detecting the presence of one or more shrieks within an audible frequency range of said audio signal; creating one or more filters to selectively attenuate the respective one or more shrieks within the audible frequency range; filtering the audio signal using the one or more filters; and transmitting the filtered audio signal to an audio telephone device.
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Citations
110 Claims
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1-55. -55. (canceled).
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56. A method of controlling the exposure of a listener to narrow-band signals in an audio signal including the steps of:
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periodically analysing the signal to determine the signal levels in particular frequency regions;
detecting a narrow-band signal based on whether the ratio of the signal level in a particular frequency region to the signal level in nearby higher and lower frequency regions exceeds a pre-determined threshold; and
in response to detection of a narrow-band signal, controlling the exposure of the listener to the detected narrow-band signal. - View Dependent Claims (57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83)
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84. An apparatus for controlling the exposure of a listener to narrow-band signals in an audio signal including:
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analysing means to periodically analyse the signal to determine the signal levels in particular frequency regions;
detection means arranged to detect a narrow-band signal based on whether the ratio of the signal level in a particular frequency region to the signal level in nearby higher and lower frequency regions exceeds a pre-determined threshold; and
controlling means arranged to control the exposure of the listener in response to detection of a narrow-band signal. - View Dependent Claims (85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110)
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Specification