| 摘要 |
A device (30) for adapting an audio input signal (V1n) to a transducer unit (20) comprises: . mapping means (10) for mapping input signal components from a first audio frequency range onto a second audio frequency range so as to produce a mapped audio signal (VM), wherein the second audio frequency range is narrower than the first audio frequency range, and wherein the transducer unit (20) has a maximum efficiency at the second audio frequency range, . filter means (31) for filtering the input signal (V1n) so as to produce a filtered input signal (V1n') having a third audio frequency range, and . combination means (32) for combining the mapped audio signal (VM) and the filtered input signal (V1n') so as to produce a transducer signal (VT). The first audio frequency range is preferably contained in the second audio frequency range, while the third audio frequency range may be adjacent the first audio frequency range. The second audio frequency range preferably extends within 5% of the Helmholtz frequency of the transducer unit (20).
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