| 摘要 |
An improved audio compressor of the type which is used in a hearing aid and having a programmable compression ratio is disclosed. In the preferred embodiment, the compressor includes a variable gain limiter which provides variable gain amplification of the input signal and as a further function of a programmable control signal. A feedforward circuit is disposed in parallel to the variable gain limiter and provides a fixed gain signal. The output of the limiter and the feedforward circuit are combined at a summing node, which serves as an output. The gain curve of the compressor defines a sigmoid function having a pivot midway between the upper and lower break points.
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