h39656 s 00002/00000/00115 d D 1.24 24/11/12 19:44:41 bevans 24 23 c Updated e s 00000/00006/00115 d D 1.23 24/11/12 19:30:58 bevans 23 22 c Updated e s 00026/00012/00095 d D 1.22 24/11/12 19:28:28 bevans 22 21 c Updated e s 00009/00005/00098 d D 1.21 23/11/06 19:47:03 bevans 21 20 c Updated e s 00009/00004/00094 d D 1.20 23/11/04 09:19:18 bevans 20 19 c Up e s 00006/00000/00092 d D 1.19 23/10/26 22:10:58 bevans 19 18 c Updated e s 00001/00001/00091 d D 1.18 23/10/24 20:59:54 bevans 18 17 c Updated e s 00010/00007/00082 d D 1.17 23/10/24 20:58:02 bevans 17 16 c Updated e s 00005/00004/00084 d D 1.16 21/11/29 14:45:56 bevans 16 15 c Updated e s 00027/00003/00061 d D 1.15 21/11/28 15:51:38 bevans 15 14 c Updated e s 00001/00001/00063 d D 1.14 21/11/04 09:15:02 bevans 14 13 c Updted e s 00002/00010/00062 d D 1.13 21/11/04 09:13:51 bevans 13 12 c Updated e s 00008/00001/00064 d D 1.12 21/11/03 09:06:33 bevans 12 11 c Updated e s 00001/00001/00064 d D 1.11 21/11/02 09:02:18 bevans 11 10 c Updated e s 00002/00002/00063 d D 1.10 21/10/30 22:15:40 bevans 10 9 c Updated e s 00002/00002/00063 d D 1.9 21/05/28 15:37:57 bevans 9 8 c Updated e s 00004/00000/00061 d D 1.8 18/11/13 20:59:51 bevans 8 7 c Updaated e s 00002/00002/00059 d D 1.7 18/10/30 11:03:28 bevans 7 6 c Updated e s 00000/00001/00061 d D 1.6 18/10/30 11:02:19 bevans 6 5 c Updated e s 00004/00002/00058 d D 1.5 18/10/30 10:55:17 bevans 5 4 c Updated e s 00004/00001/00056 d D 1.4 18/10/30 10:53:59 bevans 4 3 c Updated e s 00007/00002/00050 d D 1.3 18/10/25 11:51:45 bevans 3 2 c Updated e s 00001/00001/00051 d D 1.2 18/06/05 20:51:50 bevans 2 1 c Ipdated e s 00052/00000/00000 d D 1.1 17/10/25 00:49:25 bevans 1 0 c date and time created 17/10/25 00:49:25 by bevans e u U f i f e 0 t T I 1 Lecture 11: Infinite Impulse Response Filters

EE 313 Linear Systems and Signals - Lecture 11

Lecture by Prof. Brian L. Evans

D 15

Before Lecture

E 15 I 15

Audio Effects

E 15

Audio Effect Tutorials
- Stella, Reverb and Delay Explained, start at 1:11 mark. Delay controls when the echoes arrive, whereas reverb consists of delays that are not controlled.
- Johnny DeMarco, "EFFECTS 101: Delay", effects of feedforward and feedback delay
- Johnny DeMarco, "EFFECTS 101: Chorus", use of feedforward delays to make one voice sound like many
- Johnny DeMarco, "EFFECTS 101: Reverb", reverb (resonant sound from a large room)
- Danilo Vicari, "Top 10 DELAY Guitar Riffs...iffs...iffs", using controlled guitar delay to create other voices
Songs
- Chris Isaak, "Wicked Games", D 16 example of vibrato effort (modulation effect; shift in frequency) using a guitar whammy bar E 16 I 16 an example of vibrato effort using a guitar whammy bar. Vibrato is a slowly varying modulation effect. E 16
- The Smiths, "How Soon is Now?", D 16 opening guitar riff has a tremolo effect (rapid change in volume to give a sensation of motion) by guitarist Johnny Marr, with a second voice playing slide guitar. E 16 I 16 opening guitar riff has a tremolo effect by guitarist Johnny Marr, with a second voice playing slide guitar. Tremolo is rapid change in volume to give a sensation of motion, and is rapidly varying modulation effect. E 16 "Songs that Changed Music: The Smiths - How Soon Is Now". D 16
- Post Malone, "Circles", E 16 I 16
- Post Malone, "Circles", E 16 demonstrating use of delay, chorusing, and reverb in the vocals, and delay and reverb in the instruments. D 18 "Vocal Effects of Post Malone – Circles". E 18 I 18 "Vocal Effects of Post Malone - Circles". E 18
E 15 D 3
TBA E 3 I 3 D 4
Guitar effects related to delay E 4 I 4 D 5
Importance of dynamics in playing music: Performance RNN: Generating Music with Expressive Timing and Dynamics E 5 I 5 D 13
Importance of dynamics in playing music
- Performance RNN: Generating Music with Expressive Timing and Dynamics
E 5
Guitar effects related to delay E 4
- delay/echo by Gary Schutt (Aug. 23, 2007) D 6
- flanger by Gary Schutt (Aug. 23, 2007) E 6
- flanger by Johnny DeMarco (Oct. 19, 2009) E 7 I 7 D 9
- Delay/echo by Gary Schutt (Aug. 23, 2007) E 9 I 9
- Reverb vs. Delay or Echo by Mykola MrHardGuitar (Sep. 19, 2018) E 9
- Flanger by Johnny DeMarco (Oct. 19, 2009) E 7
E 13 I 13
Performance RNN: Generating Music with Expressive Timing and Dynamics E 13 E 3

D 23

Announcements

Mini-Project #2 is due on Friday, Oct. 27, 2017, by 12:30pm E 2 I 2 D 3
Mini-Project #2 is due on Friday, Oct. 26, 2018, by 5:00pm E 3 I 3 D 9
Mini-Project #2 is due on Friday, Nov. 2, 2018, by 5:00pm E 9 I 9 D 10
Mini-Project #2 is due on Friday, Oct. 29, 2021, by 5:00pm E 10 I 10 D 11
Mini-Project #2 is due on Wednesday, Nov. 3, 2021, by 11:59pm E 11 I 11 D 14
Mini-Project #2 is due on Thursday, Nov. 4, 2021, by 11:59pm E 14 I 14 D 17
Mini-Project #2 is due on Friday, Nov. 5, 2021, by 11:59pm E 17 I 17
Mini-Project #2 is due on Wednesday, Nov. 1, 2023, by 11:59pm, on Canvas E 17 E 14 E 11 E 10 E 9 E 3 E 2

E 23

Lecture

Lecture slides on Infinite Impulse Response (IIR) Filters in PowerPoint format. I 19
- Review of Lecture 10 Part 2 LTI Cascades
- First-Order Averaging Filter
- Zero for First-Order Numerator Polynomial
- First-Order Averaging Filter E 20 I 20 D 22
- Part 1: E 22 I 22
- Fall 2024, Part 1 E 22
  - Review of Lecture 10 Part 2 LTI Cascades
  - First-Order Averaging Filter
  - Zero for First-Order Numerator Polynomial
  - First-Order Averaging Filter E 21 I 21 D 22
  - Doccam: Review of Lecture 10 Part 2 LTI Cascades
  - Doccam: First-Order Averaging Filter
  - Doccam: Zero for First-Order Numerator Polynomial
  - Doccam: First-Order Averaging Filter
  - Demo: Three-Domain Connections E 22 I 22
  - Mini Project 2 Ideal Lowpass Filters
  - Audio effects: long delay (echo) and short delays (chorusing)
  - Origin in discrete-time and continuous-time domains E 22 E 21
  D 22
- Part 2: E 22 I 22
- Fall 2024, Part 2 E 22 D 21 Review of first-order IIR filters from z to frequency domain E 21 I 21
  - Analyzing LTI system responses in three domains
  - First-Order IIR filter transfer function and region of convergence E 24 D 22
  - Doccam: Review of first-order IIR filters from z to frequency domain E 22
  - Demo: Three-Domain Connections
  E 21 E 20
E 19 I 17
Fall 2018 lecture notes taken by Mr. Houshang Salimian (TA): Part 1 and Part 2

Supplemental Information

I 22

Fall 2023: E 22 E 17 I 12
- Reverb vs. Delay or Echo by Mykola MrHardGuitar (Sep. 19, 2018) I 13
- Reverb and Delay Explained by Stella (Mar. 28, 2017) start at 1:11 mark E 15 E 13 D 22
- Fall 2021: FIR and IIR filter uses and difference equations, and FIR matched filters E 22 I 22
- Part 1:
  - Doccam: Review of Lecture 10 Part 2 LTI Cascades
  - Doccam: First-Order Averaging Filter
  - Doccam: Zero for First-Order Numerator Polynomial
  - Doccam: First-Order Averaging Filter
- Part 2:
  - Doccam: Review of first-order IIR filters from z to frequency domain
  - Demo: Three-Domain Connections E 22
  I 22
- Fall 2021: FIR and IIR filter uses and difference equations, and FIR matched filters
E 22 E 12 I 8
D 10
Lecture notes taken by Mr. Houshang Salimian (TA): E 10 I 10 D 17
Fall 2018 lecture notes taken by Mr. Houshang Salimian (TA): E 10 D 12 Part 1 E 12 I 12 Part 1 and E 12 Part 2 E 8

E 17

Last updated %G%. Send comments to Prof. Evans at bevans@ece.utexas.edu E 1