hi all,

i have been working on CC2430 chip which use zigbee(802.15.4) protocol for communication. i need to do realtime voice communication by using it.

should i definitly use codec before sending voice?
What is the important part of realtime communiation? i used 8 bit adc and sample frequency is 8 khz. and 8 bit dac to convert to analog again. The bit rate of zigbee is 250Kbps (K bit per second).

without sending voice packet, i tried to produce voice with microphone and converted it with adc and again converted it to analog with dac and used amplifier before speaker. i heard voice well. this part worked good enough. i mean the problem is sending voice packet via rf. when i tried to send voice via rf i heard some meaningless sounds from speaker.

thanks for helps...

 

You are going to want to use a codec.. That will significantly reduce the size of the data you have to transmit. A codec and a CRC algorithm is pretty much a must.

Then its transmitting the packets.