threshold
threshold
Hi,
I need a box which convert an analogical signal to a binary one through some constraint. So I will build it, as it doesn't exist, but I would like to see with you what is the best way to be generic, etc.
Exactly, I already have this kind of box but I set it with specific mean. In fact, I combine the ability to check the constraint for an amount of sample. I think now, it would be more generic if I use some boxes to do this : one for cropping samples (select samples), another one to convert this signal to a unique value (mean), and the last one to convert to binary (threshold).
So I can build a box with constraints like ==/value, min/threshold, max/threshold, min||max/thresholds, min&&max/thresholds, etc. I think the last paragraph describe how to add time constraint. Another point could be logical gate : and, or, xor, nor, etc. But maybe a matrix transformation (spatial filter) is enough?!
What do you advise me? (and in which category do I attach these boxes)
Thanks
I need a box which convert an analogical signal to a binary one through some constraint. So I will build it, as it doesn't exist, but I would like to see with you what is the best way to be generic, etc.
Exactly, I already have this kind of box but I set it with specific mean. In fact, I combine the ability to check the constraint for an amount of sample. I think now, it would be more generic if I use some boxes to do this : one for cropping samples (select samples), another one to convert this signal to a unique value (mean), and the last one to convert to binary (threshold).
So I can build a box with constraints like ==/value, min/threshold, max/threshold, min||max/thresholds, min&&max/thresholds, etc. I think the last paragraph describe how to add time constraint. Another point could be logical gate : and, or, xor, nor, etc. But maybe a matrix transformation (spatial filter) is enough?!
What do you advise me? (and in which category do I attach these boxes)
Thanks
Re: threshold
Dear matthieuG,
sorry I don't understand what you want to do here.
Yann
sorry I don't understand what you want to do here.
Yann
Re: threshold
OK maybe not so clear...
So I want to convert a filtered EEG signal to a boolean signal (true/false or so 0/1). Are you OK there is no actual box for this?
I already build some boxes for this process but I would like your advices to give you the best one. At this point I am pretty sure the basic box is a binarisation one : convert signal through ==, < or > test (with a parameter : the threshold). But maybe a segmentation is more generic. What do you thing about this?
Next, I need logic gate to allow global boolean operation. Does a box like this already exist? Does a specific box is needed?
I began to implement a specific one but after a while, I noticed the "GeluBox" (elementWiseOperation) can make this (if I upgrade a little bit its abilities : signal/stream matrix + more operator). So do you want that logic functions are processed by a mathematic function (min(x1+x2, 1) ; mod(x1+x2, 1), etc.) or do you want standard logic function as standard function (and, or, xor, etc.). Which compromise do you want : the lower boxes/function ; the lower boxes/functionality?
So I want to convert a filtered EEG signal to a boolean signal (true/false or so 0/1). Are you OK there is no actual box for this?
I already build some boxes for this process but I would like your advices to give you the best one. At this point I am pretty sure the basic box is a binarisation one : convert signal through ==, < or > test (with a parameter : the threshold). But maybe a segmentation is more generic. What do you thing about this?
Next, I need logic gate to allow global boolean operation. Does a box like this already exist? Does a specific box is needed?
I began to implement a specific one but after a while, I noticed the "GeluBox" (elementWiseOperation) can make this (if I upgrade a little bit its abilities : signal/stream matrix + more operator). So do you want that logic functions are processed by a mathematic function (min(x1+x2, 1) ; mod(x1+x2, 1), etc.) or do you want standard logic function as standard function (and, or, xor, etc.). Which compromise do you want : the lower boxes/function ; the lower boxes/functionality?
Re: threshold
Dear matthieuG,
I had to upgrade the simple DSP functionalities for some of our research. I just uploaded a those modifications to the SVN. If you update you SVN repository, you'll now be able to use logical operators (<, >, <=, >=, ==, !=, and <>) that return 1 when true, 0 when false. I also added a ternary operator with ? and : as in C++. I also added the possibility to add up to 16 inputs (you should use a, b, c... etc, x still works and is equivalent to a). Last, I added the possibility to work on any kind of streamed matrix by changing the type of the input / output (e.g signal or spectrum).
Tell me if that fits your needs.
Kind regards,
Yann
I had to upgrade the simple DSP functionalities for some of our research. I just uploaded a those modifications to the SVN. If you update you SVN repository, you'll now be able to use logical operators (<, >, <=, >=, ==, !=, and <>) that return 1 when true, 0 when false. I also added a ternary operator with ? and : as in C++. I also added the possibility to add up to 16 inputs (you should use a, b, c... etc, x still works and is equivalent to a). Last, I added the possibility to work on any kind of streamed matrix by changing the type of the input / output (e.g signal or spectrum).
Tell me if that fits your needs.
Kind regards,
Yann
Re: threshold
It seems a good way.
Does &&, || also possible? Because the basic operation is AND, so it is also available by writing a==1 && b==1...but of course all boolean operators would be better (http://en.wikipedia.org/wiki/Logic_gate : whole operators here).
that's true (a==1+b==1)/2 could be ok if result is in integer...but I don't think so
So my boxes are not yet usefull... the only use could be a dynamic one with the threshold changing...
Does &&, || also possible? Because the basic operation is AND, so it is also available by writing a==1 && b==1...but of course all boolean operators would be better (http://en.wikipedia.org/wiki/Logic_gate : whole operators here).
that's true (a==1+b==1)/2 could be ok if result is in integer...but I don't think so
So my boxes are not yet usefull... the only use could be a dynamic one with the threshold changing...
Re: threshold
about boolean operator, ok. About 16 inputs...so you are integrating the "gelu box"? Do you allow elementwise operation and matrix operation?
Re: threshold
Dear matthieuG,
I will add boolean operations so you have everything needed...
This is not Gelu Ionescu's box, this is just an upgrade of the Simple DSP box.
Best regards
Yann
I will add boolean operations so you have everything needed...
This is not Gelu Ionescu's box, this is just an upgrade of the Simple DSP box.
Best regards
Yann
Re: threshold
Dear matthieuG,
the latest SVN now includes boolean operators :
best regards,
Yann
the latest SVN now includes boolean operators :
- ! for not
&, && for and (those two are equivalent)
|, || for or (those two are equivalent)
~, ^ for xor (those two are equivalent)
best regards,
Yann
Re: threshold
ok thanks,
I watched your grammar. Maybe you could add in CBinaryFunctionSymbols min, max, modulus. I don't see more need at this moment.
I watched your grammar. Maybe you could add in CBinaryFunctionSymbols min, max, modulus. I don't see more need at this moment.
Re: threshold
Dear matthieuG,
min and max can be easily achieved with ternary and comparison operators. modulus has no sense : we are working on real value.
hope this helps,
Yann
min and max can be easily achieved with ternary and comparison operators. modulus has no sense : we are working on real value.
hope this helps,
Yann
Re: threshold
yes that's true.