| 摘要 |
There are described a method and a device for focusing an analogue electrical signal representative of an optical code, which selectively emphasize the highest frequencies of the electrical signal. The emphasis is performed with linear phase, so that the relative positions of the peaks and valleys of the focused analogue electrical signal substantially remain unchanged. The focusing can comprise low-pass, high-pass and band-pass filtering. The focusing can be variable, and in particular, automatically variable.
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