[Csnd] Function tabl point size and sample rate. (beginner question)
| Date | 2009-12-04 10:43 |
| From | mike andrews |
| Subject | [Csnd] Function tabl point size and sample rate. (beginner question) |
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Hi, Would someone please explain to me or point me towards documentation explaining the relationship (or differences) between sample rate and function table point size? I ask as I can not figure out why in the line of code below the sample rate (sr) is divided by the ftlen to calculate the duration of the line that acts as an index for the tablei opcode. instr 1 ilength = sr/ftlen (p5) ; p5 is ftable number ain line 0, ilength, ilength * p6 ; p6 = transposition/playback speed a1 tablei ain * sr, p5 out a1 endin Thanks in advance, Mike Use Hotmail to send and receive mail from your different email accounts. Find out how. |
| Date | 2009-12-04 10:53 |
| From | Victor Lazzarini |
| Subject | [Csnd] Re: Function tabl point size and sample rate. (beginner question) |
It seems to me that the division is superfluous here, because you are then multiplying the index ain by the sr, negating the effect. Removing the division and then multiplication should keep the process as it was. Generally you would divide ftlen by the sampling rate to get the duration in seconds of a function table. Dividing the sr by the ftlen should give you the number of table-fulls of samples per sec (if that makes any sense). Say your table is 2000 points, at 20KHz sr, it will have 0.1 secs of audio (100 ms); conversely you can say you have 10 table-fulls of samples in one second (sr/ftlen). Hope this is clear. Victor On 4 Dec 2009, at 10:43, mike andrews wrote:
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| Date | 2009-12-05 12:35 |
| From | mike andrews |
| Subject | [Csnd] RE: Re: Function tabl point size and sample rate. (beginner question) |
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Thank you Victor you have been very helpful! Mike. From: Victor.Lazzarini@nuim.ie To: csound@lists.bath.ac.uk Date: Fri, 4 Dec 2009 10:53:36 +0000 Subject: [Csnd] Re: Function tabl point size and sample rate. (beginner question) It seems to me that the division is superfluous here, because you are then multiplying the index ain by the sr, negating the effect. Removing the division and then multiplication should keep the process as it was. Generally you would divide ftlen by the sampling rate to get the duration in seconds of a function table. Dividing the sr by the ftlen should give you the number of table-fulls of samples per sec (if that makes any sense). Say your table is 2000 points, at 20KHz sr, it will have 0.1 secs of audio (100 ms); conversely you can say you have 10 table-fulls of samples in one second (sr/ftlen). Hope this is clear. Victor On 4 Dec 2009, at 10:43, mike andrews wrote:
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