[ntp:questions] measuring frequency

2013-02-07 Thread Ivan Shmakov
> David Woolley writes: [Cross-posting, and setting Followup-To:, to news:comp.dsp.] [...] > In Fourier terms, the spectral width of a piano note is going to be > more than 12ppm and depend on the exact interval over which you > measure it. I would also suspect that the zero cro

Re: [ntp:questions] measuring frequency

2013-02-09 Thread unruh
On 2013-02-08, Ivan Shmakov wrote: >> David Woolley writes: > > [Cross-posting, and setting Followup-To:, to news:comp.dsp.] > > [...] > > > In Fourier terms, the spectral width of a piano note is going to be > > more than 12ppm and depend on the exact interval over which you > > measur

Re: [ntp:questions] measuring frequency

2013-02-11 Thread Robert Scott
On Sat, 09 Feb 2013 17:18:25 GMT, unruh wrote: >On 2013-02-08, Ivan Shmakov wrote: >>> David Woolley writes: >> >> [Cross-posting, and setting Followup-To:, to news:comp.dsp.] >> >> [...] >> >> > In Fourier terms, the spectral width of a piano note is going to be >> > more than 12ppm a

Re: [ntp:questions] measuring frequency

2013-02-11 Thread unruh
["Followup-To:" header set to comp.protocols.time.ntp.] On 2013-02-11, Robert Scott wrote: > On Sat, 09 Feb 2013 17:18:25 GMT, unruh wrote: > >>On 2013-02-08, Ivan Shmakov wrote: David Woolley writes: >>> >>> [Cross-posting, and setting Followup-To:, to news:comp.dsp.] >>> >>> [...

Re: [ntp:questions] measuring frequency

2013-02-11 Thread robert bristow-johnson
On 2/11/13 6:48 PM, unruh wrote: ... Yes. However what you can do is to filter out the all but the strongest harmonic, and count which harmonic number it is. how do you know what the harmonic number is? how would that information be determined in the general case. Then you know how many z

Re: [ntp:questions] measuring frequency

2013-02-12 Thread robert bristow-johnson
On 2/11/13 6:48 PM, unruh wrote: ["Followup-To:" header set to comp.protocols.time.ntp.] why do that? hey guys, fix the Newsgroup: header here. On 2/11/13 6:48 PM, unruh wrote: > ... > Yes. However what you can do is to filter out the all but the strongest > harmonic, and count which harmoni

Re: [ntp:questions] measuring frequency

2013-02-12 Thread Terje Mathisen
robert bristow-johnson wrote: On 2/11/13 6:48 PM, unruh wrote: ["Followup-To:" header set to comp.protocols.time.ntp.] why do that? hey guys, fix the Newsgroup: header here. On 2/11/13 6:48 PM, unruh wrote: > ... > Yes. However what you can do is to filter out the all but the strongest >