A sound and detection system comprising: - a digital sound reconstruction speaker, wherein said digital sound reconstruction speaker comprises a plurality of pressure-pulse producing elements (21, 111a, 111b) arranged in an array, wherein each pressure-pulse producing element (21, 111a, 111b) comprises at least a moving element (22, 31), which is constrained to move along at least an axis in response to an electrostatic force and/or piezoelectric force, wherein said moving element (22, 31) is able to be latched in at least one of its extreme positions on the axis along which it is moving, and - at least a controlling unit configured to: ∘ control the actuation of the plurality of pressure-pulse producing elements (21, 111a, 111b) of said digital sound reconstruction speaker, so as to produce at least an ultrasonic beam directed towards space during at least a first time interval, for the calculation of at least the position of at least part of an object present in space based on the sensing of at least ultrasonic sound waves reflected by said part of the object, and ∘ control the actuation of the plurality of pressure-pulse producing elements (21, 111a, 111b) of said digital sound reconstruction speaker apparatus, so as to produce audible content during at least a second time interval, ∘ wherein said control comprises controlling motion and latch of said plurality of pressure-pulse producing elements, - at least a sensor configured to sense the said reflected ultrasonic sound waves, - wherein the controlling unit is configured to control the actuation of the plurality of pressure-pulse producing elements (21, 111a, 111b) of said digital sound reconstruction speaker apparatus so as to produce said ultrasonic beam with a direction and/or shape which varies in time, in order to scan at least part of said space. - a digital sound reconstruction speaker, wherein said digital sound reconstruction speaker comprises a plurality of pressure-pulse producing elements (21, 111a, 111b) arranged in an array, wherein each pressure-pulse producing element (21, 111a, 111b) comprises at least a moving element (22, 31), which is constrained to move along at least an axis in response to an electrostatic force and/or piezoelectric force, wherein said moving element (22, 31) is able to be latched in at least one of its extreme positions on the axis along which it is moving, and - at least a controlling unit configured to: ∘ control the actuation of the plurality of pressure-pulse producing elements (21, 111a, 111b) of said digital sound reconstruction speaker, so as to produce at least an ultrasonic beam directed towards space during at least a first time interval, for the calculation of at least the position of at least part of an object present in space based on the sensing of at least ultrasonic sound waves reflected by said part of the object, and ∘ control the actuation of the plurality of pressure-pulse producing elements (21, 111a, 111b) of said digital sound reconstruction speaker apparatus, so as to produce audible content during at least a second time interval, ∘ wherein said control comprises controlling motion and latch of said plurality of pressure-pulse producing elements, ∘ control the actuation of the plurality of pressure-pulse producing elements (21, 111a, 111b) of said digital sound reconstruction speaker, so as to produce at least an ultrasonic beam directed towards space during at least a first time interval, for the calculation of at least the position of at least part of an object present in space based on the sensing of at least ultrasonic sound waves reflected by said part of the object, and ∘ control the actuation of the plurality of pressure-pulse producing elements (21, 111a, 111b) of said digital sound reconstruction speaker apparatus, so as to produce audible content during at least a second time interval, ∘ wherein said control comprises controlling motion and latch of said plurality of pressure-pulse producing elements, - at least a sensor configured to sense the said reflected ultrasonic sound waves, - wherein the controlling unit is configured to control the actuation of the plurality of pressure-pulse producing elements (21, 111a, 111b) of said digital sound reconstruction speaker apparatus so as to produce said ultrasonic beam with a direction and/or shape which varies in time, in order to scan at least part of said space.