Adaptive Sound Reproduction
First Claim
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1. A method of enhancing an audio signal, the method comprising the steps of:
- selecting frequency ranges (I, II, . . . ) of the audio signal, each frequency range being capable of containing a respective signal having a signal level (L), determining the signal level (L) in a first frequency range (I), and if the signal level (L) in the first frequency range (I) exceeds a threshold value (LMAX I);
decreasing the signal level in the first frequency range, and increasing the signal level in a second frequency range (II) different from the first frequency range (I).
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Abstract
To prevent distortion when sound is reproduced using a loudspeaker or similar transducer, the amplitude of the sound signal in a particular frequency range (I) may be reduced if it exceeds a threshold (LmAx I). The invention proposes to wholly or partially map the amplitude reduced frequencies to other frequency ranges (II). As a result, the total sound level is not affected.
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Citations
16 Claims
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1. A method of enhancing an audio signal, the method comprising the steps of:
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selecting frequency ranges (I, II, . . . ) of the audio signal, each frequency range being capable of containing a respective signal having a signal level (L), determining the signal level (L) in a first frequency range (I), and if the signal level (L) in the first frequency range (I) exceeds a threshold value (LMAX I);
decreasing the signal level in the first frequency range, and increasing the signal level in a second frequency range (II) different from the first frequency range (I). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device (1) for enhancing an audio signal, the device comprising:
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filter means (41-4N) for selecting frequency ranges (I, II, . . . ) of the audio signal, each selected frequency range being capable of containing a respective signal having a signal level (L), detection means (81-8N) for determining the signal level (L) in at least a first frequency range (I), control means (9, 10) for generating control signals (V1-VN) in response to the signal level determined by the detection means, and signal amplification/attenuation means (51 . . . 5N) for attenuating the signal of a respective frequency range in response to the said control signals (V1-VN), wherein the control means (9, 10) are arranged for;
determining whether the signal level (L) in the first frequency range (I) exceeds a respective threshold value (LMAX I) and, if this is true, decreasing the signal level (L) in the first frequency range (I), and increasing the signal level in a second frequency range (II) different from the first frequency range. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification