Signal tracer Signal tracer A signal tracer is a piece of electronic test equipment used to troubleshoot radio and other electronic circuitry. Usually a very simple device, it normally provides an amplifier, and a loudspeaker, often battery-powered and packaged into a small, hand-held test probe. An optional diode detector is usually also provided, allowing the detection of amplitude-modulated signals. The technician injects a test signal into the device under test. Then, by using the signal tracer, the tech can follow the signal through the various circuits of the radio receiver. So long as the signal can be heard, the circuitry up to
Sonar signal processing and efficiency in data analysis . Thus, it is necessary to convert an analog signal into a digital signal by sample the signal in time domain . The operation can be realized by three devices: a digital conversion device, a dynamic range controller and a digital conversion device. For simplicity, the sampling is done at equal time intervals. In order to prevent the distortion (that is aliasing in frequency domain)after reconstruct the signal from sampled signal, one must sample at a faster rate .The sampling rate, which can well preserves the information content of an analog signal formula_1, is submitted