Inverting bits
in [DSP]
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From: Avier on 2 Jan 2010 13:00 suppose if am having a clock frequency of 60 Mhz and i want to invert every third bit that is inverting signal at 20Mhz . what could be the best solution in terms of least number of storage bits . i think a counter can be used but how many storage bits we will count it? any other solutions
From: Jerry Avins on 2 Jan 2010 13:04 Avier wrote: > suppose if am having a clock frequency of 60 Mhz and i want to invert > every third bit that is inverting signal at 20Mhz . what could be the > best solution in terms of least number of storage bits . > > i think a counter can be used but how many storage bits we will count > it? > > any other solutions How many "storage bits" do you need to count to three? What other hardware? What help does knowing the clock frequency provide? Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
From: robert bristow-johnson on 2 Jan 2010 13:06 On Jan 2, 1:00 pm, "Avier" <shahanwark...(a)hotmail.com> wrote: > suppose if am having a clock frequency of 60 Mhz and i want to invert > every third bit that is inverting signal at 20Mhz . what could be the > best solution in terms of least number of storage bits . > > i think a counter can be used but how many storage bits we will count > it? > > any other solutions uhm, one thing about Digital Signal Processing that's a sorta misnomer. we ain't processing digital signals here. it's more like we're processing analog signals by digital means. that being said, it sounds like you need a counter. i'm sure someone has a nice compact divide-by-3 counter circuit laying around. it would need at least 2 flip-flops in it. r b-j
From: Vladimir Vassilevsky on 2 Jan 2010 13:16 robert bristow-johnson wrote: > that being said, it sounds like you need a counter. i'm sure someone > has a nice compact divide-by-3 counter circuit laying around. it > would need at least 2 flip-flops in it. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Nope. There is about a zillion of ways for making N-state flip-flop, i.e. flip-flap-flop for 3 states, flip-flap-flup-flop for 4 states, etc. Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com
From: Avier on 2 Jan 2010 13:27
> >How many "storage bits" do you need to count to three? What other >hardware? What help does knowing the clock frequency provide? > >Jerry > i rephrase the question , i need to innvert the every third bit of the btstream what would be the solution |