The output of a hearing aid is defined by which formula?

The output of a hearing aid is defined by the formula Input + Gain. This means that the total sound output produced by the hearing aid is a function of both the original sound input (the sound heard by the microphone) and the gain, which is the amplification provided by the device.

In practical terms, when a sound enters the microphone of a hearing aid, that sound is referred to as the input. The gain represents how much louder the hearing aid makes the input sound to enhance the user's hearing experience. Therefore, the output, or the final audible sound that the person hears through the hearing aid, is achieved by adding the gain to the initial input sound level.

Understanding this relationship is crucial for hearing aid dispensers, as it helps them to determine the appropriate settings and adjustments needed to optimize a hearing aid for an individual user's needs.