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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

UNRELEASED - DATE

Changed

  • PLL: rewritten in a different formalism. Steeper transition band, more stopband attenuation, support for very narrow bandwidth reduced somewhat.

v0.21.0 - 2026-02-11

Changed

  • Pid: use Units to scale and Build trait to convert to BiquadClamp

0.20.0 - 2026-01-13

Changed

  • All filters (CIC, Cordic, Lockin, Unwrap, Lowpass, DSM, Svf etc) port to dsp-process
  • iir: Biquad family or reworked biquad/sos implementations
  • hbf: Support all linear-phase FIR filters, redesign HBF cascades
  • PLL, RPLL, Accu: use core::num::Wrapping

Added

  • dsp-process: new design and extracted as independent crate
  • dsp-fixedpoint: new design and extracted as independent crate
  • iir: Normal form implementation
  • iir: Wdf Wave digital filter, two port adapter and tooling
  • ClampWrap: single wrap phase monotonizer
  • idsp: Python package for testing and evaluation
  • Custom Complex type enforcing the R² structure and meshing with dsp-fixedpoint
  • iir: Biquad with any combination of Simple/Clamp action on DF1, DF2T, DF1 Dither, DF1 Wide state
  • iir: Biquad a1 and a2 flip sign

Removed

  • MulScaled

0.19.0 - 2025-10-22

Changed

  • cic: added configurable comb delay to support unit-rate lowpasses
  • miniconf: 0.20

0.18.0 - 2025-05-20

Changed

  • iir::Filter: use non-inverse Q
  • iir::Pid renamed to PidBuilder
  • iir::Pid added with miniconf support
  • iir::PidBuilder feedback order is not guessed but explicit

Added

  • iir::BiquadRepr enum to convert from different representations to quantized biquad
  • cordic i32 reference CORDIC implementation, all modes

0.17.0 - 2025-01-20

Changed

  • sweptsine: support any number of harmonics

0.16.0 - 2025-01-09

Added

  • cic, configurable CIC interpolator/decimators
  • sweptsine, exponential synchronize swep sine tooling for linear and non-linear transfer function/response measurements

0.15.0 - 2024-02-09

Added

  • Dsm: Delta sigma modulator/noise shaper in MASH-(1)^K architecture.

Changed

  • Pid: Fixed period/rate mixup.

0.14.1 - 2024-01-15

  • Fixed changelog

0.14.0 - 2024-01-15

Added

  • iir::Pid, iir:Filter a builder for PID coefficients and the collection of standard Biquad filters
  • iir::Biquad::{HOLD, IDENTITY, proportional}
  • iir::Biquad getter/setter
  • iir: support for other integers (i8, i16, i128)
  • iir::Biquad: support for reduced DF1 state and DF2T state
  • svf: state variable filter

Removed

  • iir::Vec5 type alias has been removed.
  • iir_int: integrated into iir.

Changed

  • iir: The biquad IIR filter API has been reworked. IIR -> Biquad renamed.

0.13.0 - 2024-11-01

Changed

  • hbf: more taps, API rework, f32/f64 type genericism
  • PLL: redesign, add noise shaping
  • Unwrapper: simplify, redesign

0.12.1 - 2024-10-12

Changed

  • hbf taps tweaks, performance tests

0.12.0 - 2024-10-12

Added

  • hbf taps

0.11.0 - 2024-09-16

Added

  • hbf FIRs, symmetric FIRs, half band filters, HBF decimators and interpolators

0.10.0 - 2023-07-20

Changed

  • filter mod added to allow being generic about the Filter trait. This is currently i32 -> i32 filtering (SISO, no batches) only and pretty simple but it allows filter composition, chaining, repetition, and handles parameters/configuration.
  • pll reworked to use FMA instead of shifts. These are faster on the target architecture and crucially important to increase dynamic range and bias. PLL now works fine even for very small feedback gains and maintains accuracy.
  • lowpass reworked to use the new Filter trait. Also reworked to use FMA instead of shifts for greatly improved performance at low corner frequencies. Second order lowpass added.

0.9.2 - 2022-11-27

Changed

  • atan2 code refactored slightly for speed

0.9.1 2022-11-05

Changed

  • cossin code reworked for accuracy and speed

0.9.0 2022-11-03

Changed

  • Removed miniconf dependency as with miniconf >= 0.6 MiniconfAtomic is implicit.

0.8.6 - 2022-08-16

Changed

  • atan2 code refactored slightly for speed

0.8.5 - 2022-08-13

Changed

  • atan2 algorithm changed, accuracy improved from 4e-3 to 1e-5 rad max error

0.8.0 - 2022-06-07

Changed

  • Miniconf dependency bumped to 0.5

0.7.1 - 2022-01-24

Changed

  • Changed back to release 2018

0.7.0 - 2022-01-24

Added

  • Getter methods for PLL, RPLL, Lowpass, Unwrapper

Changed

  • Accu, Unwrapper, overflowing_sub are now generic.
  • Revert to PLL::update() returning the phase increment as that has less bias (while it does have more noise).

0.6.0 - 2022-01-19

Changed

  • Let the wrap return value of overlowing_sub() be a i32 in analogy to the remaining API functions for i32 and the changes in idsp v0.5.0.

0.5.0 - 2022-01-19

Changed

  • The shift parameters (log2 gains, log2 time constants) have all been migrated from u8 to u32 to be consistent with core. This is also in preparation for unchecked_shr() and unchecked_shl().
  • PLL::update() does not return the phase increment but instead the actual frequency estimate.
  • Additional zeros in the PLL transfer functions have been placed at Nyquist.

0.4.0 - 2021-12-13

Added

  • Deriving Serialize for IIR and IIR (int) to support miniconf updates.

0.3.0 - 2021-11-02

Removed

  • Removed nightly feature as it was broken in 0.2.0 and hard to fix with generics. Instead use num_cast::clamp.

0.2.0 - 2021-11-01

Changed

  • IIR is now generic over the float type (f32 and f64)

0.1.0 - 2021-09-15

Library initially released on crates.io