If the sine frequency is f and the sample rate is sr:

Let C = cos(2*pi*f/sr)

For each sample compute:

y(t) = x(t) - 2*C*x(t-1) + x(t-2)

y(t) should be 0 for every t... if not it indicates a discontinuity. This
is just an FIR filter with a zero at the given frequency.

-Ethan




On Wed, Jan 10, 2018 at 11:58 AM, STEFFAN DIEDRICHSEN <sdiedrich...@me.com>
wrote:

> With any phase discontinuity, a spectral discontinuity is delivered for
> free. So, the notch filter will have an output, a PPL would need to
> re-sync, etc.
>
> Steffan
>
>
> On 10.01.2018|KW2, at 17:51, Benny Alexandar <ben.a...@outlook.com> wrote:
>
>  But if there is a phase discontinuity it will be hard to detect.
>
>
>
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