![]() ![]() I guess if threshold voltages/diode curves are adjusted correctly ,the effect can be made more subtle. My only experience of diode clippers is in distortion stomp boxes and and guitar amps ,but to be honest its not something I like very much at all, imparting a kind of spitty sizzle to the notes edge. In mastering your dealing with known maximum levels off tape/daw, while tracking a record its very much more difficult to predict when clipping will occur. Most current ADC IC's use 2V RMS differential 0dBFS input and the driver circuit uses two inverting Op-Amp's as "active attenuator" (in the better designs), so applying these directly in the ADC would means a small extra PCB with suitable (zener) diodes and resistors, to provide the limiting/clipping.Ī +20dBu capable line level version could of course also be made. This would probably be best implemented in the ADC Driver circuit. Maybe make it so that anything below -9dBFS is "clean" and the next 6dB are progressively compressed so that a -3dBFs input sees 2:1 Compression and is actually reduced to -6dBFS and the next 6dB are compressed 3:1 so that a nominally +3dBFS becomes -3.5dBFS and then 4:1 for the next 6dB so a nominally +9dBFS input would end up somewhere below clipping. So it is generally better to not use the last top 3dB or so of a converter.Ī diode "compressor / soft-clipper" could be build external (I feel KA's projects while very interesting is unnecessarily complex and still lacks the instant zero time constant reaction of tape or diodes). These have limited stability and use extensive digital post processing.ĭigital filters are subject to inter sample "overs" when operated near clipping. Most modern converters are based around single or multi-bit delta sigma modulators. The ones that clip "cleanly are all what I call "direct conversion" types, essentially "multibit" converters.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |