The distance at which a medium voice of a human can be heard without the obstruction of other voices depends on several factors, including the individual's speaking volume, environmental conditions, background noise, and the listener's ability to focus on the specific voice.
In a quiet and relatively noise-free environment, a medium voice can typically be heard clearly from a distance of about 10 to 30 meters (30 to 100 feet) in an outdoor setting. However, this can vary significantly based on the specific circumstances.
In a crowded or noisy environment, the distance may reduce considerably due to competing sounds and background noise. In such situations, the voice may only be heard clearly within a few meters (several feet).
It's important to note that these are rough estimates and can vary depending on individual speaking volume, atmospheric conditions, and the presence of obstacles or reflective surfaces that may affect sound propagation. Additionally, the human auditory system is adaptable, and some individuals may have better hearing or be more attuned to filtering out background noise than others.
If you need to communicate with someone at a distance, it's always a good idea to get closer or find a quieter location to ensure effective communication.