What is the approximate ratio of peak envelope power to average power during normal voice modulation peak in a single-sideband phone signal?

The approximate ratio of peak envelope power to average power during normal voice modulation in a single-sideband phone signal is indeed typically around 2.5 to 1. This ratio reflects the characteristics of voice modulation, where the signal's peak power reaches higher levels than the average power due to the dynamic nature of speech.

In voice transmission, peaks occur when the speaker emphasizes certain syllables or phonetic sounds, leading to a transient increase in power. The average power, on the other hand, is calculated over a longer period, accounting for the overall energy usage of the modulated signal. For single-sideband modulation, which is more efficient than frequency modulation or amplitude modulation, this ratio indicates how much higher the peak power can be compared to the level of power that is consistently transmitted on average.

The significance of the 2.5 to 1 ratio is particularly important for engineers and operators in achieving optimal transmission quality and power efficiency, ensuring that the modulation does not exceed the capacities of the equipment used. This understanding aids in system design and helps prevent distortion from over-modulation, improving clarity and intelligibility in voice communication.