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cossin: tighten test

This commit is contained in:
Robert Jördens 2021-02-27 15:37:15 +01:00
parent 1805961d5d
commit cd289687ea
1 changed files with 4 additions and 4 deletions
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8
dsp/src/cossin.rs
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@ -11,7 +11,7 @@ include!(concat!(env!("OUT_DIR"), "/cossin_table.rs"));
/// ///
/// # Returns /// # Returns
/// The cos and sin values of the provided phase as a `(i32, i32)` /// The cos and sin values of the provided phase as a `(i32, i32)`
/// tuple. With a 7-bit deep LUT there is 1e-5 max and 6e-8 RMS error /// tuple. With a 7-bit deep LUT there is 9e-6 max and 6e-8 RMS error
/// in each quadrature over 20 bit phase. /// in each quadrature over 20 bit phase.
pub fn cossin(phase: i32) -> (i32, i32) { pub fn cossin(phase: i32) -> (i32, i32) {
// Phase bits excluding the three highest MSB // Phase bits excluding the three highest MSB
@ -81,7 +81,7 @@ mod tests {
#[test] #[test]
fn cossin_error_max_rms_all_phase() { fn cossin_error_max_rms_all_phase() {
// Constant amplitude error due to LUT data range. // Constant amplitude error due to LUT data range.
const AMPLITUDE: f64 = ((1i64 << 31) - (1i64 << 15)) as _; const AMPLITUDE: f64 = (1i64 << 31) as f64 - 0.85 * (1i64 << 15) as f64;
const MAX_PHASE: f64 = (1i64 << 32) as _; const MAX_PHASE: f64 = (1i64 << 32) as _;
let mut rms_err = (0f64, 0f64); let mut rms_err = (0f64, 0f64);
let mut sum_err = (0f64, 0f64); let mut sum_err = (0f64, 0f64);
@ -144,7 +144,7 @@ mod tests {
assert!(rms_err.0.sqrt() < 6e-8); assert!(rms_err.0.sqrt() < 6e-8);
assert!(rms_err.1.sqrt() < 6e-8); assert!(rms_err.1.sqrt() < 6e-8);
assert!(max_err.0 < 1.1e-5); assert!(max_err.0 < 9e-6);
assert!(max_err.1 < 1.1e-5); assert!(max_err.1 < 9e-6);
} }
} }