Mobile radiotelephone with handsfree device
First Claim
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1. A mobile radio transceiver with a hands-free facility, said hands-free facility comprising:
- means for combining at least two acoustic input signals and providing a combined output signal, said means for combining comprising a delay equalization circuit for equalizing delays between the input signals, said delay equalization circuit comprising plausibility examining means for examining whether a defined distance and/or direction from a starting point of the input signals to a speaker exceeds a predeterminable limit value;
an adaptive filter for filtering the combined output signal of said combining means; and
means for high-pass filtering each of the acoustic input signals.
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Abstract
A mobile radio transceiver comprising a hands-free facility, which hands-free facility combines at least two acoustic input signals to produce an output signal, and an adaptive filter is provided for filtering the combined output signal. To achieve an improved speech quality, a high-pass filter is provided for filtering the acoustic input signals.
53 Citations
10 Claims
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1. A mobile radio transceiver with a hands-free facility, said hands-free facility comprising:
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means for combining at least two acoustic input signals and providing a combined output signal, said means for combining comprising a delay equalization circuit for equalizing delays between the input signals, said delay equalization circuit comprising plausibility examining means for examining whether a defined distance and/or direction from a starting point of the input signals to a speaker exceeds a predeterminable limit value; an adaptive filter for filtering the combined output signal of said combining means; and means for high-pass filtering each of the acoustic input signals. - View Dependent Claims (2, 3, 4, 5)
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6. A hands-free facility comprising:
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means for combining at least two acoustic input signals and providing a combined output signal, said means for combining comprising a delay equalization circuit for equalizing delays between the input signals, said delay equalization circuit comprising plausibility examining means for examining whether a defined distance and/or direction from a starting point of the input signals to a speaker exceeds a predeterminable limit value; an adaptive filter for filtering the combined output signal of said combining means; a high-pass filter for filtering the acoustic input signals; and a further high-pass filter for filtering an output signal of said adaptive filter, the limit frequency of the further high-pass filter lying in the range from 200to 400 Hz. - View Dependent Claims (7, 8, 9, 10)
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Specification