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here is a problem about the spectrum of GSM .
A GSM Module , which power from external DC-DC regulator. as the osciallator of this DC-DC regualtor works around 400khz , when test GSM spectrum due to modulation , it fail on 400Khz . as its fixed working frequence of regulator , how to resolve...
Re: How to improve the "Pi-pa" noise when make a c
thanks for your suggestion , i will try on antenna .
but i searched this issue on the web , found some earphones vendors declared their eraphones are with anti-noise feature , i wonder if it's related to the chipset's DSP , maybe others. wish...
When two bluetooth devices conncting , for example , phone with bluetooth function and bluetooth earphone. when making a call , there seems a bit "Pi-Pa" background noise from earphone . it seems worse when both devices are a bit away. how to debug it ? Our BT chipset is CSR BC4. thanks