An apparatus for determining the frequency of at least one dominant sound of a ringing in an ear perceived by a patient, the apparatus comprising - a sound generator for the playing of sounds, - an input unit for inputting evaluations of the played sounds by the patient, and - a control and analysis unit coupled to the sound generator and to the input unit, the control and analysis unit being configured to carry out a similarity measurement and a pairwise sound comparison, wherein - the control and analysis unit controls the sound generator for the similarity measurement in such a manner that this plays sounds one after the other, and the control and analysis unit receives, after the playing of a sound, the evaluation of the patient input into the input unit with respect to the similarity of the respective sound to the at least one dominant sound of the ringing in the ear, - the control and analysis unit controls the sound generator for the pairwise sound comparison in such a manner that this plays pairs of sounds one after the other, and the control and analysis unit receives, after the playing of a pair, an evaluation of the patient input into the input unit about which sound of the respective pair is more similar to the at least one dominant sound of the ringing in the ear, characterized in that - the control and analysis unit is configured to combine results of the similarity measurement and of the pairwise sound comparison and, based thereon, determine at least one sound having a frequency that is most similar to the frequency of the at least one dominant sound of the ringing in the ear, - the control and analysis unit is configured to determine, as a result of the similarity measurement, a sound having a frequency that is most similar to the frequency of the at least one dominant sound of the ringing in the ear in accordance with the similarity measurement, and - the control and analysis unit is configured to control the sound generator in such a manner that this generates sounds for the pairwise sound comparison that lie within a predefined frequency range around the frequency of the sound determined as a result of the similarity measurement, which has the frequency that is most similar to the frequency of the at least one dominant sound of the ringing in the ear in accordance with the similarity measurement. - a sound generator for the playing of sounds, - an input unit for inputting evaluations of the played sounds by the patient, and - a control and analysis unit coupled to the sound generator and to the input unit, the control and analysis unit being configured to carry out a similarity measurement and a pairwise sound comparison, wherein - the control and analysis unit controls the sound generator for the similarity measurement in such a manner that this plays sounds one after the other, and the control and analysis unit receives, after the playing of a sound, the evaluation of the patient input into the input unit with respect to the similarity of the respective sound to the at least one dominant sound of the ringing in the ear, - the control and analysis unit controls the sound generator for the pairwise sound comparison in such a manner that this plays pairs of sounds one after the other, and the control and analysis unit receives, after the playing of a pair, an evaluation of the patient input into the input unit about which sound of the respective pair is more similar to the at least one dominant sound of the ringing in the ear, - the control and analysis unit is configured to combine results of the similarity measurement and of the pairwise sound comparison and, based thereon, determine at least one sound having a frequency that is most similar to the frequency of the at least one dominant sound of the ringing in the ear, - the control and analysis unit is configured to determine, as a result of the similarity measurement, a sound having a frequency that is most similar to the frequency of the at least one dominant sound of the ringing in the ear in accordance with the similarity measurement, and - the control and analysis unit is configured to control the sound generator in such a manner that this generates sounds for the pairwise sound comparison that lie within a predefined frequency range around the frequency of the sound determined as a result of the similarity measurement, which has the frequency that is most similar to the frequency of the at least one dominant sound of the ringing in the ear in accordance with the similarity measurement.