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Hi Klaust
I am sure you are a great engineer. we just not in the same page. Thanks for trying to help. really appreciate it. and you were right. i will need audio codec in order to feed digital audio data to modem and read audio data from modem. but usually some modem has I2S interface so we...
i am not sure at which part you don't understand. i want to read audio from GSM call and write audio during call. that was the main goal
in order to do that, there are a few option i know. two of them are using i2s interface (digital data) and using speaker&mic(analog data) from module.
so...
Hi Klaus
as far as i know any modem will need external MCU, for example to answer the call in the first place, then get the AUDIO data. unless we use programmable GSM module like A9 Ai Thinker ( i am planning on buying this type ) when you can control all the process inside. what i need is a...
Hi Klaus
yeah, any modem will have analog audio output and input. there wont be a complicated processing. may be just recording and play it back to modem. sure i need external MCU so i am considering modem with I2S interface so i only need a little time to read audio data cause the bandwidth...
sorry, may be i am not telling the whole requirement.
i also need to send an audio through GSM module as well. so i need external DAC as well. and do a little processing with the audio data.
i did a few search before i asked on this forum. and i came across SIM800 as well. but i found this...
Hi
i want to retrieve audio from GSM. i know if i use ADC it need a decent external ADC with i2s or something. and if i use module with i2s interface, the module price would be high. does anyone have a recommendation for me on how to get audio out of GSM module?
Hi All,
i have been searching for how does direction finder work, especially with pseudo doppler. I want to use it to find UHF frequency source, for example i want to trace BTS GSM900 in around me.
what i want to ask are:
1. how is it possible to get different frequency phase for let's say...
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