US 4,289,399 A · Light signal observation device

Abstract

A light signal observation device, which is provided in combination with light receiving means for detecting a light signal, light intermitting means for intercepting or passing therethrough the light signal incident to the light receiving means, amplifying means for amplifying the output from the light receiving means; time base signal generating means for generating a sawtooth wave in synchronism with the light signal and also while the light signal is intercepted and for generating a luminance modulation signal in the period of generation of the sawtooth wave, and display means for displaying an optical signal waveform including a 0 level on the basis of the output signal from the amplifying means and the sawtooth signal and the luminance modulation signal from the time base signal generating means. The light signal observation device of this invention may be constructed as a synchroscope or a sampling oscilloscope.

Claims34

Dependent claims

A light signal observation device comprising;

in combination:
light receiving means for detecting a light signal;
light intermitting means for intercepting or passing therethrough the light signal incident to the light receiving means;
amplifying means for amplifying the output from the light receiving means;
time base signal generating means for generating a sawtooth wave in synchronism with the light signal passed by the light intermitting means and while the light signal is intercepted and for generating a luminance modulation signal in the period of generation of the sawtooth wave;
and display means for displaying a light signal waveform including a 0 level on the basis of the output signal from the amplifying means and the sawtooth wave and the luminance modulation signal from the time base signal generating means.

3 more elements

A light signal observation device comprising, in combination, light receiving means for detecting a light signal, light intermitting means for intercepting or passing therethrough the light signal incident to the light receiving means, amplifying means provided with a negative feedback path including switching means responsive to the operation of the light intermitting means to be turned ON and OFF for amplifying the output from the light receiving means;

storage means for storing a feedback voltage while the negative feedback path is established;
time base signal generating means for generating a sawtooth wave in synchronism with the light signal while the negative feedback path is cut off and also while the negative feedback path is established and for generating a luminance modulation signal in the period of generation of the sawtooth wave;
and display means for displaying a light signal waveform including a 0 level on the basis of the output signal from the amplifying means and the sawtooth wave and the luminance modulation signal from the time base signal generating means.

A light signal observation device comprising:

light receiving means for detecting a light signal;
light intermitting means for intercepting or passing therethrough the light signal incident to the light receiving means;
sampling means for obtaining, by sampling, a low-frequency signal similar in waveform to the output from the light receiving means while the light signal is incident thereto and a 0 level signal while the light signal is intercepted;
time base signal generating means for generating a time base signal;
amplifying means having a negative feedback path formed between the output and the input of the sampling circuit via switching means opening and closing in response to the operation of the light intermitting means;
storing means for storing a feedback voltage produced while the negative feedback voltage is established;
and display means for displaying the low-frequency signal and the 0 level signal in synchronism with with said time base signal, whereby an optical signal waveform including the 0 level is displayed.

4 more elements

A light signal observation device comprising, in combination:

light receiving switch means;
light receiving means for detecting a light signal and converting it into an electrical signal while the light receiving switch means operates;
amplifying means provided with a negative feedback path having switching means opening and closing in reponse to the operation of the light receiving switch means for amplifying the output from the light receiving means;
storing means for storing a feedback voltage while the negative feedback path is established;
time base signal generating means for generating a sawtooth wave in synchronism with the light signal while the negative feedback path is cut off, for generating the sawtooth signal also while the negative feedback path is set up and for generating a luminance modulation signal while the sawtooth wave is generated;
and display means for displaying a light signal waveform including the 0 level on the basis of the output signal from the amplifying means and the sawtooth wave and the liminance modulation signal from the time base signal generating means.

3 more elements

A light signal observation device, comprising light receiving switch means, light receiving means for detecting an optical signal and converting it into an electrical signal while the light receiving switch means operates, a sampling circuit and time base signal generating means for obtaining, by sampling, a low-frequency signal similar in the waveform to the output from the light receiving means when the light receiving switch means is operative and a 0 level signal when the light receiving switch means is inoperative, amplifying means provided with a negative feedback path formed between the output and the input of the sampling circuit via switching means opening and closing in response to the operation of the light receiving switch means, storing means for storing a feedback voltage produced while the negative feedback path is established, and display means for displaying the low-frequency signal and the 0 level signal, whereby a light signal waveform including the 0 level is displayed.

Dependencies are inferred from the claim text.

Light signal observation device

Life of this patent

Light signal observation device

Life of this patent

Abstract

Claims34