McDewey

Echoed Voice This section describes voice problems with an echo quality. Listener Echo G Talker Echo G Tunnel Voice G Listener Echo Symptom - Listener and talker echo sound similar, although the signal strength of listener echo might be lower. The essential difference between them is who hears the echo and where it is produced. Listener echo is the component of the talker echo that leaks through the near-end hybrid and returns again to the listener, which causes a delayed softer echo. The listener hears the talker twice. Cause - Common causes are: Insufficient loss of the echo signal. G Long echo tail. G Echo cancellers in the gateway adjacent to the near-end hybrid not activating. G Talker Echo Symptom - Talker echo is the signal which leaks in the far-end hybrid and returns to the sender (talker). The talker hears an echo of his or her own voice. Cause - Common causes are: Insufficient loss of the echo signal. G Echo cancellers in the gateway adjacent to the far-end hybrid not activating. G Acoustic echo caused by the phone of the listener. G Talker Echo Symptom Recording Control Recording without the Symptom Talker Echo Snippet Recording Tunnel Voice Symptom - Tunnel voice is similar to talking in a tunnel or on a poor quality mobile phone car kit. Cause - A common cause is tight echo with some loss. For example, 10 ms delay and 50 percent loss on the echo signal. Tunnel Voice Symptom Recording Control Recording without the Symptom Tunnel Voice Snippet Record Garbled Voice