Re: [Alsa-user] "best" card for "bitperfect" SPDIF I/O?with?external clock sync ?
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From: Bill U. <un...@ph...> - 2007-11-26 18:52:13
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On Mon, 26 Nov 2007, Sergei Steshenko wrote: > On Mon, 26 Nov 2007 18:19:24 +0100 > Benoit Rouits <br...@fr...> wrote: > >> Le dimanche 25 novembre 2007 à 18:26 +0300, Vladimir Mosgalin a écrit : >>> That's the main reason why I asked - I heard that people can hear >>> 22khz or about that when they are young, than listening gets worse and >>> they don't hear very high frequencies anymore - and since I consider >>> myself still young ;), I was kind of disappointed by the fact that I >>> can't hear not only 22khz, but even 20khz, and when I discovered that >>> I can't hear even 18khz, I was kind if scared - is my hearing going >>> down due to headphone usage? Thanks for clarifying this issue. >> >> Theorically, A 44100 sampled audio CD can reproduce a triangle signal >> at 22050 Hz. > > No, it can't. Sure it can. The difference between a triangle wave and a square wave a 22000 is harmonics whose frequency is far higher than 22050. Ie, the harmonics are irrelevant. Thus a triangle, a square, a sine, a sawtooth are all the same. One could say that the triangle is closer since it has lower amplitude harmonics than most of the others. > > Draw timing diagrams with different relative phases of the signal and > sampling frequencies. > > Your output will be 22050 Hz 50% duty cycle square wave whose amplitude > (and polarity/phase) depend on the above relative phase. |