dsp: constructor style

dsp/src/accu.rs

@@ -5,8 +5,8 @@ pub struct Accu {
 }
 
 impl Accu {
-    pub fn new(state: i32, step: i32) -> Accu {
-        Accu { state, step }
+    pub fn new(state: i32, step: i32) -> Self {
+        Self { state, step }
     }
 }
 

dsp/src/complex.rs

@@ -15,9 +15,9 @@ impl Complex<i32> {
     /// Complex::<i32>::from_angle(-1 << 30);  // -pi/2
     /// ```
     #[inline(always)]
-    pub fn from_angle(angle: i32) -> Complex<i32> {
+    pub fn from_angle(angle: i32) -> Self {
         let (c, s) = cossin(angle);
-        Complex(c, s)
+        Self(c, s)
     }
 
     /// Return the absolute square (the squared magnitude).

dsp/src/iir_int.rs

@@ -19,7 +19,7 @@ impl Vec5 {
     ///
     /// # Returns
     /// 2nd-order IIR filter coefficients in the form [b0,b1,b2,a1,a2]. a0 is set to -1.
-    pub fn lowpass(f: f32, q: f32, k: f32) -> Vec5 {
+    pub fn lowpass(f: f32, q: f32, k: f32) -> Self {
         // 3rd order Taylor approximation of sin and cos.
         let f = f * 2. * PI;
         let fsin = f - f * f * f / 6.;
@@ -31,7 +31,7 @@ impl Vec5 {
         let a1 = (2. * fcos / a0) as _;
         let a2 = ((alpha - 1.) / a0) as _;
 
-        Vec5([b0, 2 * b0, b0, a1, a2])
+        Self([b0, 2 * b0, b0, a1, a2])
     }
 }
 

dsp/src/lockin.rs

@@ -1,4 +1,7 @@
-use super::{iir_int::{IIR, Vec5}, Accu, Complex};
+use super::{
+    iir_int::{Vec5, IIR},
+    Accu, Complex,
+};
 use serde::{Deserialize, Serialize};
 
 #[derive(Copy, Clone, Default, Deserialize, Serialize)]
@@ -10,10 +13,8 @@ pub struct Lockin {
 impl Lockin {
     /// Create a new Lockin with given IIR coefficients.
     pub fn new(ba: Vec5) -> Self {
-        let mut iir = IIR::default();
-        iir.ba = ba;
-        Lockin {
-            iir,
+        Self {
+            iir: IIR { ba, ..Default::default() },
             state: [Vec5::default(); 2],
         }
     }

dsp/src/rpll.rs

@@ -22,8 +22,8 @@ impl RPLL {
     ///
     /// Returns:
     /// Initialized RPLL instance.
-    pub fn new(dt2: u8) -> RPLL {
-        RPLL {
+    pub fn new(dt2: u8) -> Self {
+        Self {
             dt2,
             ..Default::default()
         }
@@ -107,7 +107,7 @@ mod test {
 
     impl Harness {
         fn default() -> Self {
-            Harness {
+            Self {
                 rpll: RPLL::new(8),
                 dt2: 8,
                 shift_frequency: 9,