On Thursday 06 November 2008, OrazioPirataDelloSpazio (Lorenzo) wrote: 1st, the switch needs to switch a voltage, otherwise there is nothing to record. Most voltages (think carbon zinc 1.5 volt battery) are going to be too high for a mic input, but will drive it to saturation in the A-d stage. This could be used to advantage, but depends on the card. If the input is DC coupled, then the output data should be a 16 bit signed integer, with a zero value when the switch is open, and full scale when it is closed. Sure, read the data stream as signed integers and look for that point where it suddenly goes full scale from some value that is lose to zero. The capture clocking will likely be the same as the playback, and likely will be a 16 bit per sample capture since 8 bit, without a lot of monkey business in the capture channel, is pretty poor telephone quality. More than adequate for what you want to do, but probably not something the hardware can be talked into doing. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) QOTD: Silence is the only virtue he has left.

OrazioPirataDelloSpazio (Lorenzo) wrote: one option is to rip some code from a ladspa gate plugin and use that to create a software event. or you could use a midi trigger and receive a midi event. the easiest approach is to rms the data to get loudness information, and then generate an event if a certain threshold is reached. further refinements could be variable attack and hold times and a bandpass to filter out unwanted noise. take a look at any noise gate implementation. generally, no. but you can capture at 16bit/44k1. afterwards it is a trivial operation to resample and decimate if necessary. -- jörn nettingsmeier home://germany/45128 essen/lortzingstr. 11/ http://spunk.dnsalias.org phone://+49/201/491621 Kurt is up in Heaven now.