Originally Posted by hciman77
Well....
1) Why can you not capture a 10K square wave ?, my understanding was that a square wave is effectively an infinite set of sine waves , but is it that much harder to capture one at 10K rather than 1K ?, that is a genuine question.
2) They are just undergrads so we ought to cut them some slack and as for technical report well it doesnt claim to be a technical report in the sense that it doesnt claim to exhaustively test the product. It is a comparison study.
Yes your understanding is correct. A 10KHz square wave has frequency component up to 100KHz. So to capture or transmit a square wave you will actually need a bandwidth of 100KHz or more. The sound card is band limited to 22 KHz. In order assure proper operation of the DAC an anti-aliasing filter at 20KHz is used. So after the filtering the square wave will be transformed into a sine wave.
If you read closely at the report, the report is published by a contracted agent and is not affliated with the University of Toronto. So what you have is a guy that hire 4 UT student (probably not even fulll time) and claim this is a UT report.
If I go out and hire some Stanford liberal art major and publish a report. Can I claim the report is a Standford study?
Actually I have no problem with the report, careful reading will show it is not really relevant. But I have problem with the misleading statement "University of Toroto Test" and "Walters Forensic Lab" (the actual study) never comes up.