def get_conn(self):
        """
        Retrieves connection to Cloud Text to Speech.

        :return: Google Cloud Text to Speech client object.
        :rtype: google.cloud.texttospeech_v1.TextToSpeechClient
        """
        if not self._client:
            self._client = TextToSpeechClient(credentials=self._get_credentials())
        return self._client
Retrieves connection to Cloud Text to Speech.

        :return: Google Cloud Text to Speech client object.
        :rtype: google.cloud.texttospeech_v1.TextToSpeechClient