A method and apparatus can be configured to transmit broadcast system information to a user equipment. If an electric signal is applied between the counter electrode and one of the two comb-shaped electrodes, a longitudinal wave composed of the main lobe and grating lobes is radiated into a material in contact with the counter electrode, as well as a Lamb wave is excited in the piezoelectric substrate. In a first iteration, interference from the first set of N channels imparted on the second set of M channels is removed from the multiplexed signal, thereby enabling the symbol values associated with the second set of M channels to be reliably estimated. A plurality of the audio signals are mixed at every band, adjusts the levels of the mixed signals of the respective bands based on the adjusting amount, adds the adjusted signals of the respective bands and outputs it as a mixed audio signal. The second dielectric layer is patterned such that the first dielectric layer is disposed on the surface of the semiconductor substrate in a second area over the channel. According to the invention, the vessel prostheses or patches are subjected to a full stretching with a degree of extension between 30% and 250% and subsequent restoration.