At the same time, a string of {HEAD ~ synthetic speech samples} is transmitted to {TAIL ~ an audio server} 
At the same time , a string of { HEAD ~ synthetic speech samples } is transmitted to { TAIL ~ an audio server }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL