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dsp/window: use conventional 2dp approximate constants

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This commit is contained in:
Dan Kortschak
2020-09-16 14:29:00 +09:30
parent dfc757bb79
commit dda0908b26
4 changed files with 18 additions and 18 deletions
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4
dsp/window/window.go
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@@ -143,8 +143,8 @@ func BartlettHann(seq []float64) []float64 {
// Spectral leakage parameters: ΔF_0 = 4, ΔF_0.5 = 1.33, K = 2, ɣ_max = -42, β = -5.37. // Spectral leakage parameters: ΔF_0 = 4, ΔF_0.5 = 1.33, K = 2, ɣ_max = -42, β = -5.37.
func Hamming(seq []float64) []float64 { func Hamming(seq []float64) []float64 {
const ( const (
a0 = 25.0 / 46.0 a0 = 0.54
a1 = 1 - a0 a1 = 0.46
) )
k := 2 * math.Pi / float64(len(seq)-1) k := 2 * math.Pi / float64(len(seq)-1)

4
dsp/window/window_complex.go
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@@ -148,8 +148,8 @@ func BartlettHannComplex(seq []complex128) []complex128 {
// Spectral leakage parameters: ΔF_0 = 4, ΔF_0.5 = 1.33, K = 2, ɣ_max = -42, β = -5.37. // Spectral leakage parameters: ΔF_0 = 4, ΔF_0.5 = 1.33, K = 2, ɣ_max = -42, β = -5.37.
func HammingComplex(seq []complex128) []complex128 { func HammingComplex(seq []complex128) []complex128 {
const ( const (
a0 = 25.0 / 46.0 a0 = 0.54
a1 = 1 - a0 a1 = 0.46
) )
k := 2 * math.Pi / float64(len(seq)-1) k := 2 * math.Pi / float64(len(seq)-1)

24
dsp/window/window_example_test.go
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@@ -67,16 +67,16 @@ func Example() {
// freq=0.4500 cycles/period, magnitude=0.0707, phase=-1.7279 // freq=0.4500 cycles/period, magnitude=0.0707, phase=-1.7279
// freq=0.5000 cycles/period, magnitude=0.0000, phase=0.0000 // freq=0.5000 cycles/period, magnitude=0.0000, phase=0.0000
// Hamming window: // Hamming window:
// freq=0.0000 cycles/period, magnitude=0.0218, phase=3.1416 // freq=0.0000 cycles/period, magnitude=0.0542, phase=3.1416
// freq=0.0500 cycles/period, magnitude=0.8022, phase=-2.9845 // freq=0.0500 cycles/period, magnitude=0.8458, phase=-2.9845
// freq=0.1000 cycles/period, magnitude=7.1723, phase=0.3142 // freq=0.1000 cycles/period, magnitude=7.1519, phase=0.3142
// freq=0.1500 cycles/period, magnitude=8.6285, phase=-2.6704 // freq=0.1500 cycles/period, magnitude=8.5907, phase=-2.6704
// freq=0.2000 cycles/period, magnitude=2.0420, phase=0.6283 // freq=0.2000 cycles/period, magnitude=2.0804, phase=0.6283
// freq=0.2500 cycles/period, magnitude=0.0702, phase=0.7854 // freq=0.2500 cycles/period, magnitude=0.0816, phase=0.7854
// freq=0.3000 cycles/period, magnitude=0.0217, phase=-2.1991 // freq=0.3000 cycles/period, magnitude=0.0156, phase=-2.1991
// freq=0.3500 cycles/period, magnitude=0.0259, phase=-2.0420 // freq=0.3500 cycles/period, magnitude=0.0224, phase=-2.0420
// freq=0.4000 cycles/period, magnitude=0.0184, phase=-1.8850 // freq=0.4000 cycles/period, magnitude=0.0163, phase=-1.8850
// freq=0.4500 cycles/period, magnitude=0.0092, phase=-1.7279 // freq=0.4500 cycles/period, magnitude=0.0083, phase=-1.7279
// freq=0.5000 cycles/period, magnitude=0.0000, phase=0.0000 // freq=0.5000 cycles/period, magnitude=0.0000, phase=0.0000
} }
@@ -100,8 +100,8 @@ func ExampleHamming() {
// Output: // Output:
// //
// src: [1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000] // src: [1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000 1.000000]
// srcCpy: [0.086957 0.111692 0.183218 0.293785 0.431409 0.581178 0.726861 0.852672 0.944977 0.993774 0.993774 0.944977 0.852672 0.726861 0.581178 0.431409 0.293785 0.183218 0.111692 0.086957] // srcCpy: [0.080000 0.104924 0.176995 0.288404 0.427077 0.577986 0.724780 0.851550 0.944558 0.993726 0.993726 0.944558 0.851550 0.724780 0.577986 0.427077 0.288404 0.176995 0.104924 0.080000]
// dst: [0.086957 0.111692 0.183218 0.293785 0.431409 0.581178 0.726861 0.852672 0.944977 0.993774 0.993774 0.944977 0.852672 0.726861 0.581178 0.431409 0.293785 0.183218 0.111692 0.086957] // dst: [0.080000 0.104924 0.176995 0.288404 0.427077 0.577986 0.724780 0.851550 0.944558 0.993726 0.993726 0.944558 0.851550 0.724780 0.577986 0.427077 0.288404 0.176995 0.104924 0.080000]
} }
func ExampleValues() { func ExampleValues() {

4
dsp/window/window_test.go
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@@ -71,8 +71,8 @@ var windowTests = []struct {
{ {
name: "Hamming", fn: Hamming, fnCmplx: HammingComplex, name: "Hamming", fn: Hamming, fnCmplx: HammingComplex,
want: []float64{ want: []float64{
0.086957, 0.111692, 0.183218, 0.293785, 0.431408, 0.581178, 0.726861, 0.852672, 0.944977, 0.993774, 0.08, 0.104924, 0.176995, 0.288404, 0.427077, 0.577986, 0.72478, 0.85155, 0.944558, 0.993726,
0.993774, 0.944977, 0.852672, 0.726861, 0.581178, 0.431409, 0.293785, 0.183218, 0.111692, 0.086957, 0.993726, 0.944558, 0.85155, 0.72478, 0.577986, 0.427077, 0.288404, 0.176995, 0.104924, 0.08,
}, },
}, },
{ {