Embodiments of the present disclosure include an apparatus configured to perform beamforming on multiple audio input signals. So that, in constant gain amplification mode, a setpoint transmitted by the first regulator is held at a value close to the setpoint of constant value. The actuatorblocking device includes a body configured to move between a first position in the SAFE arrangement and a second position in the FIRE arrangement, an aperture extending through the body, and an actuator. The PCI to be used, a CQI indicating downlink channel quality, and ACKNACK indicating a data decoding result are borne over an uplink HS-DPCCH. A third optical path optically coupled to the first optical path includes a first fiber Bragg grating. The transfer curve of the printer is modified according to the calibration input.