Using this method, which is a development of pulse duration modulation, multiehannel biomedical signals can be recorded with ordinary tape recorders, as the PRM inhibits in a considerable degree the transfer noise due to fluctuations of tape moving speed.
We have used multipurpose analysis system, model HP-3562A and CF-920, to do comparing experiments for VTR made in Japan and China, analyzed their characteristics on Tape Transmit system.
This instrument may record ECG continuously for a long period on a tape on the basis of pulse phase modulation principle, then it plays the tape and recovers ECG on an electrocardiogrph or an electrocardio-oscilloscope for diagnosis, research and medical education.
A new method, which adopts "Rolling Raster" as a length standard, takes aim at the scale mark via a microscope and directly verifies the scale intervals of a measurand steel tape, is introduced and the errors are analyzed briefly.
Experiments [1, 2] have revealed a transition accompanied by an appreciable enhancement of pulsations whose period is twice that of the driving vibrating tape.
Results are given of experimental investigations of heat transfer under conditions of forced convection of highly subcooled water in a smooth pipe and with an internal twisted tape under asymmetric heating.
The technique for measuring distortions is described, and the results of measurements are presented for several films cut from different sections of a standard piece of double-sided tape with a length of ~7 m and a useable width of ~20 cm.
The standard plastic base of the tape under investigation is 190 μm thick; ~50-μm-thick layers of diluted PX3 emulsion-gel are applied to its opposite sides.
This paper is a continuation of "Application of pulse width modulation in radio tran- smission and magnetic recording". The disadvantages of most of popular cassete tape recorders are low response and high noise in amplitude modulation. This will lead to spurious pulse duration modulation, if the level cut method is used for reproducing PDM wave during playback of the cas- sete tape recorder. To solve this problem, a peak detecion method for reproducing PDM wave is developed and presented in thi...
The major status on the automation reform of the photoelectric transit instrument was introduced, Converting axis and putting circle for the instrument has been automatized by using a program controller and a paper tape input.
An electrocardiograph generally is not possible to reoord ECG continuosly for a long period, due to recording paper quantitatiye limitation. Thus, an electrocardiograph usually can not record transient and anomalous ECG which appears accidentally and is of diagnostic significance. So we have developed type XDL—1 tape electrocardiographs. This instrument may record ECG continuously for a long period on a tape on the basis of pulse phase modulation principle, then it plays the tape and recov...