Quectel GSM Module Audio Design Guide V3.0

• About the document
• Contents
• Table Index
• Figure Index
• 1 Introduction
  • 1.1. Summary
  • 1.2. Safety Information
• 2 Audio Circuit Design
  • 2.1. Audio Circuit Reference
    • 2.1.1. M1x
      • 2.1.1.1. Microphone Reference Circuit
      • 2.1.1.2. Receiver Reference Circuit
      • 2.1.1.3. Headset Reference Circuit
    • 2.1.2. M95
    • 2.1.3. Microphone Reference Circuit
      • 2.1.3.1. Receiver Reference circuit
      • 2.1.3.2. Headset Reference Circuit
      • 2.1.3.3. SPK Reference Circuit
    • 2.1.4. M80
      • 2.1.4.1. Microphone Reference Circuit
      • 2.1.4.2. Receiver Reference Circuit
      • 2.1.4.3. Headset Reference Circuit
      • 2.1.4.4. SPK Reference Circuit
  • 2.2. Ringtone
  • 2.3. Hands-free Application at Channel AIN1/AOUT1
  • 2.4. Suggestion for Audio Layout
  • 2.5. TDD Noise Solution
  • 2.6. Suggestion for Mechanical Design
  • 2.7. Component of SPK
  • 2.8. Component of Microphone
• 3 Description and Suggestion
  • 3.1. AT Command
    • 3.1.1. AT+QAUDCH
    • 3.1.2. How to Modify Volume
      • 3.1.2.1. AT+QMIC
      • 3.1.2.2. AT+CLVL
      • 3.1.2.3. AT+QSIDET
    • 3.1.3. Echo Algorithm
      • 3.1.3.1. Description of Par0, Par2 and Par12
      • 3.1.3.2. Recommended Application Field
• 4 Appendix A