Troubleshooting Sound Noise Issues in Audio Circuit
Troubleshoot sound noise issues in an audio circuit caused by noise at the initial and end parts of a sound play. Explore solutions involving controlling shutdown pins, codec power management, and external amplifier operations to clear the disturbances effectively. Detailed operation sequences and recommendations provided.
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Presentation Transcript
<<Sound Noise Issue>> - Noise at the initial part and the end part of a sound play 1. Shutdown pin(AMP) is always low(Active AMP) A sound is played Noise at the initial part P3 P1 Codec power on P2 P4 P3 P4 P2 AMP P1 SPK Codec Out : SPK_OUT P5 SHUTDOWN
1. Shutdown pin is always low(Active AMP) : continued. Codec PWR On/Off P4 P1 DC very low noise P5 AC P4 P4 P5 Noise at the end part P4 SPK P5 SHUTDOWN Could you recommend any solution to clear these noises ???
2. Shutdown pin is controlled A sound is played The noise is cleared by the Shutdown control Codec power on P1 P4 SHUTDOWN SHUTDOWN [[ Operation Sequence ]] 1. Codec Power On 2. Ext. AMP On(SHUTDOWN Low) 3. 100ms Delay 4. Sound output 5. Ext. AMP Off(SHUTDOWN High) 6. Codec Power Off P4 P5 P4 - P5
2. Shutdown pin is controlled : continued A sound is played repeatedly : codec power is still on After 2 nd play Codec power on P4 SHUTDOWN After the 2 nd play, there is a noise at the initial part of the sound [[ Operation Sequence ]] 1. Codec Power On(Register 0x3C/0x3E) 2. Ext. AMP On(SHUTDOWN Low) 3. 100ms Delay 4. Sound output 5. Operation 3/4 repeated 6. 7. Ext. AMP Off(SHUTDOWN High) Codec Power Off
2. Shutdown pin is controlled : continued A sound is played repeatedly : codec power is still on After 2 nd play After 2 nd play Codec power on (0x3C/0x3E) P4 P4 P5 P4 - P5 SHUTDOWN Could you recommend any solution to clear these noises ???
