Provided is a data acquisition module. The mode locking laser is coupled to said first interferometer arm so that said amplifier of the first interferometer arm is a common component of the mode locking laser and said interferometer structure. According to the method a combustible gas and oxygen is fed into the combustion chamber, which has a generally elongated shape, the gas mixture is ignited for generating a pressure pulse, and the pressure pulse is released from the chamber and conducted to the amplifying horn. Moreover, SAGE is useful as a gene discovery tool for the identification and isolation of novel sequence tags corresponding to novel transcripts and genes. In using the exercise device, the user may obtain any of three motions. The circuit up converts a received RF signal to a high IF signal and then down converts the high IF signal to a low IF signal.