1 Sub-Systems Design Review Group P14345 Team Lead: William Sender Jeffrey Auclair Bryan Beatrez Michael Ferry

2 Agenda 1. Background Problem Statement MicroController Requirements 2. Sub-System Analysis Risks Architecture Analysis / Detailed Design Project Plan

3 Section One Background

4 Problem Statement Audio amplitude control for motion picture shows. Maintain the quality and dynamics of the sound. Improve flexibility while maintaining audio quality. Maintain usability that of previous devices.

5 MicroController Requirements AD Converter (not mandatory) DA Converter (If not then two PWM outputs) LCD/LED Support Hardware Interrupts (2-3) Timers (3) I2C bus (7 devices) Fast, at least 350 instructions per sample at 44.1kHz GPIO (6-8) We are learning towards STM32F3 series processor

6 Section Two Sub-System Analysis

7 Risk Assessment

8 Architecture

9 Sub-System Focus

10 Noise Budget

11 Noise Budget

12 Noise Budget

13 Input Stage Analysis

14 Input Stage Analysis

15 Manual Mode Overview

16 Pre-Compression Routine

17 Compression Routine

18 Auto Mode When initially switched on only safety compression will engage. After some time the microcontroller will begin to develop successive approximations of compression settings based on the signal dynamics. Must be unnoticeable changes while still very responsive. Timing is key, it cannot be done in a sample but must be done within a few seconds to be beneficial.

19 Week 9 - Choose MicroController - VCA Testing - LPF Design Week 10 - DA and AD Selection - Averaging Circuit Design - Start writing pre-compression routine - Start writing auto-mode routine Project Plan

20 Week Test pre-compression routine - Meet with faculty - Write compression routine - Design UI Week Detailed Design - Bill of Materials - Validation/Verification Project Plan

21 Questions