Noise immunity for continuous-phase pulse-frequency modulation in the presence of low-intensity noise

1974 ◽  
Vol 10 (24) ◽  
pp. 515
Author(s):  
S. Bellini ◽  
G. Tartara
Keyword(s):  
Frequency Modulation ◽  
Noise Immunity ◽  
Pulse Frequency ◽  
Continuous Phase ◽  
Intensity Noise ◽  
Pulse Frequency Modulation ◽  
Low Intensity

Demonstration of 6-bit, 0.20-mVpp Quasi-Triangle Voltage Waveform Generator Based on Pulse-Frequency Modulation

2014 ◽  
Vol E97.C (3) ◽  
pp. 194-197 ◽  
Author(s):  
Yoshitaka TAKAHASHI ◽  
Hiroshi SHIMADA ◽  
Masaaki MAEZAWA ◽  
Yoshinao MIZUGAKI
Keyword(s):  
Frequency Modulation ◽  
Pulse Frequency ◽  
Waveform Generator ◽  
Voltage Waveform ◽  
Pulse Frequency Modulation

A digital system for generating dynamic sinusoidal gas concentration signals

1988 ◽  
Vol 65 (2) ◽  
pp. 945-949 ◽  
Author(s):  
S. A. Barton ◽  
L. Sutton ◽  
C. E. Hahn ◽  
A. M. Black
Keyword(s):  
Frequency Modulation ◽  
Pulse Frequency ◽  
Respiratory Monitoring ◽  
Gas Mixing ◽  
Pulse Frequency Modulation ◽  
Gas Concentration ◽  
Mixing Chamber ◽  
Computer Controlled ◽  
The Individual ◽  
Valve Switching

A computer-controlled gas-mixing system is presented. It is capable of mixing four gases, the concentration of three of which will follow a path to be determined by the user. For our purposes the output O2 fraction is maintained constant and the levels of Ar and N2O vary sinusoidally and independently, with periods between 0.25 and 30 min. A fourth gas, N2 is necessary to make the sum of the individual fractions 100%. The system uses banks of between one and four solenoid valves each linked via a sonic choke to a common mixing chamber. A regime of pulse frequency modulation is employed. All calculations and timing of valve switching are performed by a dedicated microcomputer built for the purpose. The device has been used to provide respiratory gas forcing functions for a program of research in respiratory monitoring.

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