> Marcel Mueller <news.5.maazl@spamgourmet.org> wrote:
>
>> On 06.03.16 02.09, Larry Gadallah wrote:
>
>>> I am working on a tone receiver that uses cross-correlation to
>>> implement a matched filter for the tone. I have frames of samples that I
>>> cross-correlate with a frame containing samples of a pure reference
>>> tone. My question involves windowing: Should I use a windowing function
>>> on each frame? Should the windowing function apply both to the signal
>>> frame and the reference frame?
>>
>> If your reference samples are *always* periodic within the FFT block
>> size, i.e. they do not contain frequencies that are not harmonics of FFT
>> length, then you do not need a window function. Maybe you can ensure this.
>
> Odd that the OP said nothing about using an FFT (or even, working
> in discrete time) yet these things get assumed.
>> I am working on a tone receiver that uses cross-correlation to
>> implement a matched filter for the tone. I have frames of samples that I
>> cross-correlate with a frame containing samples of a pure reference
>> tone. My question involves windowing: Should I use a windowing function
>> on each frame? Should the windowing function apply both to the signal
>> frame and the reference frame?
>
>If your reference samples are *always* periodic within the FFT block
>size, i.e. they do not contain frequencies that are not harmonics of FFT
>length, then you do not need a window function. Maybe you can ensure this.
Odd that the OP said nothing about using an FFT (or even, working
in discrete time) yet these things get assumed.
Steve
Reply by Marcel Mueller●March 6, 20162016-03-06
On 06.03.16 02.09, Larry Gadallah wrote:
> Hi all:
>
> I am working on a tone receiver that uses cross-correlation to implement a matched filter for the tone. I have frames of samples that I cross-correlate with a frame containing samples of a pure reference tone. My question involves windowing: Should I use a windowing function on each frame? Should the windowing function apply both to the signal frame and the reference frame?
If your reference samples are *always* periodic within the FFT block
size, i.e. they do not contain frequencies that are not harmonics of FFT
length, then you do not need a window function. Maybe you can ensure this.
Marcel
Reply by Larry Gadallah●March 5, 20162016-03-05
Hi all:
I am working on a tone receiver that uses cross-correlation to implement a matched filter for the tone. I have frames of samples that I cross-correlate with a frame containing samples of a pure reference tone. My question involves windowing: Should I use a windowing function on each frame? Should the windowing function apply both to the signal frame and the reference frame?
Thanks in advance,