Consumer Electronics

LOUDNESS COMPENSATION

Another need for equalisation arises from playing program at a level different from that at which it is recorded or picked up. For example, background music systems, unless they use specially recorded music, play at a much lower level than the program is normally reproduced. Without equalisation it seems to lack character, because all of the lower frequencies, and some of the extreme highs, seem to disappear due to reduced sensitivity of the average human hearing facility in these frequency ranges at reduced levels.

 

 

Fig. 23.3 Two playback equalisation curves standardised for phonograph records

 

 

Fig. 23.4 Standard ...