How to find the Zero Crossing Rate of a signal?

45 ビュー (過去 30 日間)
Kwaku Owusu
Kwaku Owusu 2021 年 1 月 19 日
回答済み: Frantz Bouchereau 2021 年 10 月 13 日
Please, I want to determine the Zero Crossing Rate of an Acoustic Signal. I would be glad if someone could provide me with a code in Matlab to carry out such exercise,
Thank you in advance.

採用された回答

Star Strider
Star Strider 2021 年 1 月 29 日
Try this:
t = linspace(0, 5, 500).^3; % Time Vector
s = sin(2*pi*t*0.2); % 10 Hz Sine Curve
zx = find(diff(sign(s))); % Zero-Crossing Indices To ‘t’
for k = 1:numel(zx)
idx_rng = max(zx(k)-1, 1):min(zx(k)+1,numel(t));
tzro(k) = interp1(s(idx_rng), t(idx_rng), 0); % Exact Zero Crossings
end
zx_rate = gradient(tzro); % Calculate Rate
figure
yyaxis left
plot(t, s, '-b')
hold on
plot(tzro, zeros(size(tzro)), 'xr')
hold off
yyaxis right
plot(tzro, zx_rate, 'LineWidth',2)
grid
legend('Signal','Zero-Crossings','Zero-Crossing Rate')
axis('tight')
Once you have the zero-crossings, you can do whatever processing on them that you want.
.

その他の回答 (2 件)

Frantz Bouchereau
Frantz Bouchereau 2021 年 10 月 13 日
Signal Processing Toolbox in MATLAB R2021b ships a new zerocrossrate function that you can use to find zero crossing rates of a signal.

Mathieu NOE
Mathieu NOE 2021 年 1 月 19 日
hello
i am not sure what a "rate" can be about zero crossing, but at least maybe this code will give you access to zero or whatever threshold value crossing detection
positive slope and negative slope are detected separatly
hope it helps !
  3 件のコメント
Mathieu NOE
Mathieu NOE 2021 年 1 月 20 日
you're welcome
would you accept my answer ? tx
Kwaku Owusu
Kwaku Owusu 2021 年 1 月 29 日
Please, I cannot see the code provided. Thank you.

サインインしてコメントする。

タグ

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by