A laundry dryer (11, 111) comprising: - a drum (14, 114) for receiving laundry to be dried, - a drive motor for the drum, - an air supply (20, 120) to the drum, - an air exhaust from the drum, - a fan (21, 121) for generating an air flow toward the drum (14, 114) through the air supply (20, 120) and away from the drum through the air exhaust - a fan drive (24, 124) for the fan (21, 121), - heating means (26a, 26b, 126a, 126b) for heating the air flow, - temperature detection means for detecting the temperature of the air supplied to the drum (14, 114) or of the air discharged from the drum, - humidity sensing means for sensing the humidity of the air supplied into the drum (14, 114) or of the air discharged from the drum, - a controller comprising: o a memory in which at least one preset curve for the course of temperature and/or humidity over time for a specific drying program of laundry is stored, o computing means which are designed to compare values for temperature and/or humidity currently detected during a drying program, depending on the drying phase of the laundry, with a preset curve and to determine at which operating point of the preset curve the drying program is located, - the controller being designed to influence the further drying program on the basis of the operating point by means of an adaptation of the temperature of the air flow by influencing the heating means (26a, 26b, 126a, 126b) and/or by means of an adaptation of the strength of the air flow by influencing the fan (21, 121), characterized in that: - the humidity detection means surround the fan (21, 121) and a fan drive (24, 124), respectively, - the humidity can be determined from the control of the fan drive (24, 124) of the fan (21, 121) in such a way that, in the case of high humidity in the air moved by the fan, a high rotational torque is to be provided by the drive and, in the case of low humidity in the air conveyed by the fan, a low torque is to be provided by the fan drive, - the controller is designed to determine the humidity in the air from the control of the fan drive (24, 124) of the fan (21, 121), - the direction of the fan or the direction of the air flow is reversed several times at time intervals in order to then suck air out of the drum (14, 114) into the air supply (20, 120) in order to obtain information about the exhaust air, the information comprising the humidity of the exhaust air. - a drum (14, 114) for receiving laundry to be dried, - a drive motor for the drum, - an air supply (20, 120) to the drum, - an air exhaust from the drum, - a fan (21, 121) for generating an air flow toward the drum (14, 114) through the air supply (20, 120) and away from the drum through the air exhaust - a fan drive (24, 124) for the fan (21, 121), - heating means (26a, 26b, 126a, 126b) for heating the air flow, - temperature detection means for detecting the temperature of the air supplied to the drum (14, 114) or of the air discharged from the drum, - humidity sensing means for sensing the humidity of the air supplied into the drum (14, 114) or of the air discharged from the drum, - a controller comprising: o a memory in which at least one preset curve for the course of temperature and/or humidity over time for a specific drying program of laundry is stored, o computing means which are designed to compare values for temperature and/or humidity currently detected during a drying program, depending on the drying phase of the laundry, with a preset curve and to determine at which operating point of the preset curve the drying program is located, o a memory in which at least one preset curve for the course of temperature and/or humidity over time for a specific drying program of laundry is stored, o computing means which are designed to compare values for temperature and/or humidity currently detected during a drying program, depending on the drying phase of the laundry, with a preset curve and to determine at which operating point of the preset curve the drying program is located, - the controller being designed to influence the further drying program on the basis of the operating point by means of an adaptation of the temperature of the air flow by influencing the heating means (26a, 26b, 126a, 126b) and/or by means of an adaptation of the strength of the air flow by influencing the fan (21, 121), - the humidity detection means surround the fan (21, 121) and a fan drive (24, 124), respectively, - the humidity can be determined from the control of the fan drive (24, 124) of the fan (21, 121) in such a way that, in the case of high humidity in the air moved by the fan, a high rotational torque is to be provided by the drive and, in the case of low humidity in the air conveyed by the fan, a low torque is to be provided by the fan drive, - the controller is designed to determine the humidity in the air from the control of the fan drive (24, 124) of the fan (21, 121), - the direction of the fan or the direction of the air flow is reversed several times at time intervals in order to then suck air out of the drum (14, 114) into the air supply (20, 120) in order to obtain information about the exhaust air, the information comprising the humidity of the exhaust air.