Abstract: A cardiac signal generator includes a first circuit, a user input device, an output display, and a processing circuit. The first circuit provides, according to any of predetermined plurality of settings, cardiac signals comprising a repeating cardiac waveform, and respiratory signals comprising a repeated respiratory waveform. The output display includes a plurality of indicators, each indicator corresponding to one of the plurality of settings. Each setting includes a combination of a frequency of repetition of the cardiac waveform and a frequency of repetition of the respiratory waveform. The processing circuit causes the first circuit to provide cardiac and respiratory signals according to a selected one of the plurality of settings. The processing circuit is further configured to receive a signal from the user input device, and change the selected setting from a first setting of the plurality of settings to a second setting of the plurality of settings responsive thereto.

Abstract: A cardiac signal generator includes a portable housing, a memory, a processing device, a digital to analog converter, and at least one analog output. The memory stores programming instructions including instructions defining a plurality of mathematical relationships. The processing device is configured to execute the programming instructions to generate a sequence of output values using the plurality of mathematic relationships as a function of time, wherein the sequence of output values defines a sampled waveform output simulating an ECG signal and having linear portions and at least one curved portion. The processing device furthermore provides the sequence of output values at an output. The digital to analog converter is operably coupled to receive the sequence of output values from the output, and generates an electrical signal having a waveform corresponding to the sampled waveform output. The analog output is operably coupled to the digital to analog converter.

Abstract: A cardiac signal generator includes a portable housing, a memory, a processing device, a digital to analog converter, and at least one analog output. The memory stores programming instructions including instructions defining a plurality of mathematical relationships. The processing device is configured to execute said programming instructions to generate a sequence of output values using the plurality of mathematic relationships as a function of time, wherein said sequence of output values defines a sampled waveform output simulating an ECG signal and having linear portions and at least one curved portion. The processing device furthermore provides the sequence of output values at an output. The digital to analog converter is operably coupled to receive the sequence of output values from the output, and generates an electrical signal having a waveform corresponding to the sampled waveform output. The analog output is operably coupled to the digital to analog converter.

Abstract: A cardiac signal generator includes a first circuit, a user input device, an output display, and a processing circuit. The first circuit provides, according to any of predetermined plurality of settings, cardiac signals comprising a repeating cardiac waveform, and respiratory signals comprising a repeated respiratory waveform. The output display includes a plurality of indicators, each indicator corresponding to one of the plurality of settings. Each setting includes a combination of a frequency of repetition of the cardiac waveform and a frequency of repetition of the respiratory waveform. The processing circuit causes the first circuit to provide cardiac and respiratory signals according to a selected one of the plurality of settings. The processing circuit is further configured to receive a signal from the user input device, and change the selected setting from a first setting of the plurality of settings to a second setting of the plurality of settings responsive thereto.