17. Audiometer to obtain test sounds, or frequency, versus preceived amplitude in x-y coordinate diagrammatic output form for testing hearing of a test 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, for use with succeeding tests, in which different test sounds or frequencies are supplied to the test person by a test person transducer means (TX); 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 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; wherein the output unit comprises a liquid crystal display (LCD) in x-y coordinate matrix form (11, 26) connected to and controlled by said digital matrix control circuit and providing an output in coordinate form of perceived amplitude of a respective test sound or frequency at the instant of reception of the perception output signal; said audiometer further including a curve generating stage (45) connected to said data bus and providing output signals to the driver stage (24) to generate, on said LCD in matrix form (11, 26) a straight line pattern between coordinate displays representative of the coordinates of amplitude and frequency of the test signals upon each succeeding reception of perception output signals.
17. Audiometer to obtain test sounds, or frequency, versus preceived amplitude in x-y coordinate diagrammatic output form for testing hearing of a test 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, for use with succeeding tests, in which different test sounds or frequencies are supplied to the test person by a test person transducer means (TX); 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 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; wherein the output unit comprises a liquid crystal display (LCD) in x-y coordinate matrix form (11, 26) connected to and controlled by said digital matrix control circuit and providing an output in coordinate form of perceived amplitude of a respective test sound or frequency at the instant of reception of the perception output signal; said audiometer further including a curve generating stage (45) connected to said data bus and providing output signals to the driver stage (24) to generate, on said LCD in matrix form (11, 26) a straight line pattern between coordinate displays representative of the coordinates of amplitude and frequency of the test signals upon each succeeding reception of perception output signals. 18. Audiometer according to claim 17, wherein said means for generating electrical signals comprises a tone or frequency generator means (21, G); and said means (15, 16) for controlling the nature of the test sounds comprises frequency control means controlling the output frequency of the tone generator.