Info

此问题已关闭。 请重新打开它进行编辑或回答。

search for signal of fixed duration and frequency

1 次查看（过去 30 天）
cob
cob 2015-6-18
关闭： MATLAB Answer Bot 2021-8-20
Hi , I have an audio signal which i have recorded , i need to determine if inside the recorded signal , i have a smaller signal with duration of 250 ms and frequency of 400 Hz. Which method should i use for it ?

请先登录，再回答此问题。

回答（1 个）

Luffy
Luffy 2015-6-18
编辑：Luffy 2015-6-18
Do the fft of the audio signal. You'll get spikes at the frequencies present in your signal.
How to do fft: doc fft.
Doing fft tells you if there is a signal of 400 Hz in your audio,to know the duration pass your audio through a notch filter of 400 Hz

标签

Community Treasure Hunt

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

Start Hunting!

Translated by