Csound Csound-dev Csound-tekno Search About

Re: sndinfo

Date1998-04-19 15:51
FromRichard Dobson
SubjectRe: sndinfo
I can't answer for the ppc as such, but sndinfo elsewhere simply reports
essential information form the file header - srate, duration, nchans, etc.
The acoustic character of the file can only be ascertained by analysis and
listening. It is possible for the header to include information about the
'base frequency', which is for the benefit of samplers, and identifies the
key to which to assign the data  for non-transposed playback. This info is
entered directly by the user, given the appropriate software, and does not
arise from any automatic analysis of the data. Indeed, even when Base Freq is
set in the header, there is no guarantee that it accurately reflects the data
at all!

Richard Dobson

tolve wrote:

> concerned that subsonic sideband frequencies that result from fm might
> damage speakers. tried to check out some files with sndinfo, but base Frq
> doesn't show up in the report on ppc running csound 3.48. how do i
> ascertain lowest frequency?
>
> tolve



Date1998-04-19 18:58
Fromtolve
SubjectRe: sndinfo
thanks richard,

i was confused by the appearance of base frequency in sndinfo documentation
in the manual. you have cleared that up.

tolve

>I can't answer for the ppc as such, but sndinfo elsewhere simply reports
>essential information form the file header - srate, duration, nchans, etc.
>The acoustic character of the file can only be ascertained by analysis and
>listening. It is possible for the header to include information about the
>'base frequency', which is for the benefit of samplers, and identifies the
>key to which to assign the data  for non-transposed playback. This info is
>entered directly by the user, given the appropriate software, and does not
>arise from any automatic analysis of the data. Indeed, even when Base Freq is
>set in the header, there is no guarantee that it accurately reflects the data
>at all!
>
>Richard Dobson
>
>tolve wrote:
>
>> concerned that subsonic sideband frequencies that result from fm might
>> damage speakers. tried to check out some files with sndinfo, but base Frq
>> doesn't show up in the report on ppc running csound 3.48. how do i
>> ascertain lowest frequency?
>>
>> tolve