PREEMPH stands for Pre-emphasis, which is a term commonly used in the field of audio signal processing. It refers to a technique employed to improve the quality and intelligibility of audio signals, particularly during transmission and playback processes.
Pre-emphasis is mainly used to counteract the frequency response limitations of audio systems, especially those that operate in the analog domain. The technique involves boosting the higher frequencies of an audio signal before it is transmitted or recorded. This is done by applying a specific filter to the signal, which amplifies the higher frequencies in a selective manner.
The purpose of pre-emphasis is to compensate for the loss of high-frequency content that often occurs during audio reproduction or transmission. By amplifying these higher frequencies, the signal-to-noise ratio of the audio is improved, resulting in a clearer and more balanced sound. When the pre-emphasized signal reaches the receiving end, it undergoes the reverse process called de-emphasis, which attenuates the higher frequencies to restore the original frequency response.
Pre-emphasis is commonly used in radio broadcasting, where weak high-frequency signals often suffer from reduced intelligibility due to noise and interference. It is also employed in audio recording and playback systems, especially those that use analog formats, to optimize the audio quality.
In summary, PREEMPH, or pre-emphasis, refers to a technique that boosts higher frequencies in an audio signal before transmission or recording, to improve the overall quality and intelligibility of the audio.
