Patent Document ID: 4476724
Application ID: 06439423

Base Claim:
1. Audiometer to obtain test sounds, or frequency, versus perceived amplitude in diagrammatic x-y coordinate output form for testing hearing of a person for tones, music and speech having an output unit (11) in form of a coordinate system in which amplitude forms one coordinate parameter and sound, or frequency another coordinate parameter; means (21) for generating electrical test signals representative of test sounds or tones; amplitude control means (15, 16) connected to said test sound or tone generating means for controlling the amplitude of the output thereof and providing an amplitude control output signal; tone control means (17, 18) connected to said test sound or tone generating means for controlling the nature of the test sound or frequency of the test tone thereof, and providing a test sound control output signal; test person transducer means (TX) transducing the test sound, or tone signals of the nature of the sound or at the frequency of the test tone and the level controlled by the tone control means and the amplitude control means, respectively; and test person controlled response means (13, 14) providing an electrical perception output signal if a predetermined test sound, or tone has been perceived, comprising, in accordance with the invention, an electronic digital matrix control circuit (10) receiving said amplitude control output signal, said test sound or tone control output signal and the perception output signal; and wherein the output unit comprises a liquid crystal display (LCD) in matrix form (11, 26) connected to and controlled by said digital matrix control circuit and providing an output in x-y coordinate form of perceived amplitude of a respective test sound or frequency at the instant of reception of the perception output signal.

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Claim 2:
2. Audiometer according to claim 1 wherein the LCD comprises a plane LCD matrix (26) and a light illuminating source (30) located beneath the LCD matrix.