I get a suspicious short (100ms ?) beep sound after every phrase (stringToSay) executed with:
void ALTextToSpeechProxy::say(const std::string& stringToSay);
I get it only on my newer V6 robot, not on the old one V5. I have experienced it when running C++ compiled module, but the phenomenon may be easily observed even with the following simple .py code, executed on the robot. It's like after "hello" comes a short break and then a beep.
#! /usr/bin/env python
import qi
import sys
def main(session):
tts = session.service("ALTextToSpeech")
tts.say("hello")
session = qi.Session()
session.connect("tcp://127.0.0.1:9559")
main(session)