ws50529
50 lines
1.6 KiB
Python
Executable File
50 lines
1.6 KiB
Python
Executable File
import numpy as np
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from fastapi import HTTPException
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from scipy import signal
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from .config import BODE_MAX_MULTIPLIER, BODE_POINTS
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from .schemas import BodeCompareParams, BodeParams
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from .validation import require_finite, validate_coefficients
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def _bode_series(b_values, a_values, f_eval, fs_val):
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b_vals = validate_coefficients(b_values, "b")
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a_vals = validate_coefficients(a_values, "a")
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_, h = signal.freqz(b_vals, a_vals, worN=f_eval, fs=fs_val)
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return {
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"mag": (20 * np.log10(np.abs(h) + 1e-12)).tolist(),
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"phase": np.angle(h, deg=True).tolist(),
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}
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def _frequency_axis(fs):
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fs_val = require_finite(fs, "fs")
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f_min = fs_val / 50000.0
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f_max = fs_val * BODE_MAX_MULTIPLIER
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return fs_val, np.logspace(np.log10(f_min), np.log10(f_max), BODE_POINTS)
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def calculate_bode_response(params: BodeParams):
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fs_val, f_eval = _frequency_axis(params.fs)
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series = _bode_series(params.b, params.a, f_eval, fs_val)
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return {
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"freq": f_eval.tolist(),
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"mag": series["mag"],
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"phase": series["phase"],
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}
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def calculate_bode_compare_response(params: BodeCompareParams):
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fs_val, f_eval = _frequency_axis(params.ideal.fs)
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fixed_fs_val = require_finite(params.fixed.fs, "fixed.fs")
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if not np.isclose(fixed_fs_val, fs_val):
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raise HTTPException(status_code=400, detail="ideal 與 fixed 的 fs 必須相同")
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ideal = _bode_series(params.ideal.b, params.ideal.a, f_eval, fs_val)
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fixed = _bode_series(params.fixed.b, params.fixed.a, f_eval, fs_val)
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return {
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"freq": f_eval.tolist(),
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"ideal": ideal,
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"fixed": fixed,
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}
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