Jitter generation compare to dithering
in [DSP]
|
From: BCLIM on 5 Nov 2009 01:04 Hi, I have a doubt on jitter generation. Wonder is the method to generate jitter signal is that same as dithering generation method? Understand that both are usign random signal generation with different distribution. For example, triangular, rectangular etc.
From: Greg Heath on 7 Nov 2009 14:56 On Nov 5, 1:04 am, "BCLIM" <boonchun_...(a)yahoo.com> wrote: > Hi, > I have a doubt on jitter generation. Wonder is the method to generate > jitter signal is that same as dithering generation method? Understand that > both are usign random signal generation with different distribution. For > example, triangular, rectangular etc. I always thought that for a signal defined over a finite length of time, jittering added a randomness to the amplitude whereas dithering added a randomness to the starting time. Hope this helps. Greg
From: Jerry Avins on 7 Nov 2009 17:16 Greg Heath wrote: > On Nov 5, 1:04 am, "BCLIM" <boonchun_...(a)yahoo.com> wrote: >> Hi, >> I have a doubt on jitter generation. Wonder is the method to generate >> jitter signal is that same as dithering generation method? Understand that >> both are usign random signal generation with different distribution. For >> example, triangular, rectangular etc. > > I always thought that for a signal defined over a finite length of > time, > jittering added a randomness to the amplitude whereas dithering > added a randomness to the starting time. > > Hope this helps. It probably hurts. Jitter randomizes the timing of pulse edges. When you look at such a signal on an oscilloscope, the trace jitters. Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
From: Eric Jacobsen on 7 Nov 2009 18:02 On 11/7/2009 12:56 PM, Greg Heath wrote: > On Nov 5, 1:04 am, "BCLIM"<boonchun_...(a)yahoo.com> wrote: >> Hi, >> I have a doubt on jitter generation. Wonder is the method to generate >> jitter signal is that same as dithering generation method? Understand that >> both are usign random signal generation with different distribution. For >> example, triangular, rectangular etc. > > I always thought that for a signal defined over a finite length of > time, > jittering added a randomness to the amplitude whereas dithering > added a randomness to the starting time. > > Hope this helps. > > Greg I think it'd help for the OP to clarify what he means by his terminology. In my experience jitter usually means random fluctuation in period, (usually sampling period), while dithering usually means adding small random values to an input to reduce quantization noise. It's also not clear whether the OP is asking about unintentional or intentional jitter. Some clocking systems add jitter in order to reduce spurious emissions related to the clock frequency. Is that the topic of the question? -- Eric Jacobsen Minister of Algorithms Abineau Communications http://www.abineau.com
From: Greg Heath on 8 Nov 2009 03:23
On Nov 7, 5:16 pm, Jerry Avins <j...(a)ieee.org> wrote: > Greg Heath wrote: > > On Nov 5, 1:04 am, "BCLIM" <boonchun_...(a)yahoo.com> wrote: > >> Hi, > >> I have a doubt on jitter generation. Wonder is the method to generate > >> jitter signal is that same as dithering generation method? Understand that > >> both are usign random signal generation with different distribution. For > >> example, triangular, rectangular etc. > > > I always thought that for a signal defined over a finite length of > > time, > > jittering added a randomness to the amplitude whereas dithering > > added a randomness to the starting time. > > > Hope this helps. > > It probably hurts. Jitter randomizes the timing of pulse edges. When you > look at such a signal on an oscilloscope, the trace jitters. Given your additional comment. it helps emphasize that terminology is application dependent. In the fields of classification and regression, the terminology is as I have indicated. Hope this helps. Greg |