Patent ID: 7564979

Claim:
Apparatus for adjusting the frequency response characteristics of a sound reproduction system, said reproduction system including a source of audio frequency electrical signals, at least one electronic amplifier, and at least one electro-acoustical transducer, said amplifier having an input connected to receive said electrical signals from said source and having an output connected to said transducer to produce sound waves corresponding to said electrical signals which are perceived by a human listener, said apparatus further comprising: an electrical audio test signal generator connected to the input of said amplifier to produce a sequence of different test sound waves having different volume levels and different frequency content which can be heard by said listener, input means for accepting indications from said listener indicative of the perceived intensity of at least some of said different test waves as perceived by said listener, a processor responsive to said indications for translating said indications into a plurality of control values, and an adjustable equalizer connected between said source of audio frequency electrical signals and the input of said amplifier, said equalizer being coupled to said processor to receive said control values and preferentially amplify said electrical signals at different frequencies in accordance with said control values.