Causes of echo in a mobile phone

Echo is reflected sound, which is a natural phenomenon, that is, in the case of an echo during telephone communication, the sound returns to the person speaking. When encountering an obstacle, sound may be absorbed or reflected. For example, in an empty room or when we are in the mountains, we often hear an echo because the sound of our voice is reflected against obstacles - walls, rocks. Or, let's give a vivid example with the absorption of sound waves, so if we are in a recording studio, the walls of which have an additional insulating surface that absorbs sound waves, we will not hear the echo, getting the clearest possible voice sound. Modern technologies use special equipment aimed at improving the quality of sound transmission, working with noise reduction to prevent the formation of echoes. In what cases can an echo occur during a call?

The most common causes of echo during telephone communication arise for these reasons:

     • If there are problems on the line or a malfunction of the equipment or cable, then there may be a problem with voice transmission and conversion. This effect can be achieved with weak noise reduction, mainly in analog networks. This is called hybrid echo;

     • If the person you are talking to is using the speakerphone mode on their phone, this can sometimes cause an echo effect. This is called acoustic echo;

     • In addition to these points, there is an opinion that, occasionally, a problem may arise due to the technical design of a mobile phone, which is found mainly in outdated cellular devices with poor implementation of the noise reduction system or defective cables, poor sealing of the device. A similar effect can occur due to certain factors affecting the technical processing of the communication signal: switching the communication signal to another tower during communication, when there are too many active subscribers at a given moment, or when the connection is poor.