thinkdsp.py 文件源码

def evaluate(self, ts):
        """Evaluates the signal at the given times.

        ts: float array of times

        returns: float wave array
        """
        ts = np.asarray(ts)
        cycles = self.freq * ts + self.offset / PI2
        frac, _ = np.modf(cycles)
        ys = frac**2 * (1-frac)
        ys = normalize(unbias(ys), self.amp)
        return ys