Cirrus-logic AN168 Instrukcja Użytkownika Strona 36
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- Application Note 1
- TABLE OF CONTENTS 2
- LIST OF FIGURES 3
- 1.2 Mechanical Design 4
- 1.2.1.1 Speaker Requirements 4
- 1.3 Electrical Design 5
- 6 AN168REV2 6
- 1.3.3 Volume Control 7
- 1.3.4 Acoustic Coupling 8
- AN168REV2 9 9
- 10 AN168REV2 10
- 1.3.6 Acoustic Sidetone 11
- 1.4 Echo Canceler Parameter 11
- Optimization 11
- 1.4.1 Starting Example 11
- 1.4.2 Tweaking the Parameters 12
- 1.4.3 Network Sidetone 13
- 1.5 Tests 14
- 1.4.4 Loop Gain 14
- 1.5.1 Acoustic Coupling 15
- 1.5.1.1 Loop Gain Method 15
- 16 AN168REV2 16
- 1.5.2 Acoustic Distortion 17
- 1.5.2.1 Frequency Sweep Test 18
- 1.5.2.2 Buzz Test 18
- 1.5.3 Acoustic ERLE 19
- 1.5.3.2 Loop Gain Method 20
- AN168REV2 21 21
- 22 AN168REV2 22
- AN168REV2 23 23
- 1.5.4.2 Double-talk 24
- 1.6 Layout Guidelines 25
- 1.6.2 Car-Kit guidelines 26
- 1.6.2.1 +5VA/AGND Components 26
- 1.6.2.2 +5VD/DGND Components 26
- 1.7.2 Distortion 27
- 1.7.3 Speaker/mic placement 27
- 1.7.4 Acoustic coupling 28
- 1.7.5 Training sequence 28
- AN168REV2 29 29
- Gain = R2/R1 30
- 15 Watts into 4 ohms 31
- Gain = +17.8dB 31
- Gain = [R2/(R1+R2)]*[200] 31
- 3 Watts into 4 ohms 32
- Gain = +10.7dB 32
- Gain = [R2/(R1+R2)]*[1+R4/R5] 32
- AN168REV2 33 33
- 34 AN168REV2 34
- AN168REV2 35 35
- Figure 25. LM 1877 Schematic 35
- 3. REVISION HISTORY 36
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