Digital transmission system
AssigneeThe United States of America as represented by the Secretary of the Army
InventorAdolf Reindl
Life of this patent
Estimating the term…
Abstract
A digital transmission system for transmitting quantized values of the exmal points of an analog wave. A PCM encoder quantizes the extremal points which are detected by an extremal detector. The PCM digital elements are transmitted to a first-in-first-out buffer under the control of a buffer control logic which is fed information concerning the rate of occurrence of the extremal points. The number of PCM digital elements transmitted will vary in number in accordance with a rule which is a function of the rate of occurrence of the extremal points. Generally, the number of elements per extremal sample decreases when the rate of occurrence of extremal samples increases and vice versa.
Claims5
A digital transmission system for transmitting in digital format the extremal points of analog input wave comprising:
- an input terminal means for receiving said analog input wave;
- extremal detector means connected to said input terminal for detecting the occurrence of extremal points on said analog input wave;
- digital encoder means connected to said input terminal means and to the output of said extremal detector means for encoding the amplitude of said extremal points into a digital word having a predetermined number of digital elements;
- sampling clock means for generating a clock signal at a sampling rate;
- rate indicator means connected to the output of said sampling clock means and to the output of said extremal detector means for indicating the rate of occurrence of said extremal points;
- first-in-first-out buffer means for storing digital elements;
- transmission means, including transmission clock means, connected to the output of said buffer means for transmitting digital elements out of said buffer means at a transmission rate;
- and buffer control means connected to the output of said sampling clock means and to the output of said rate indicator means for transmitting a predetermined number of the most significant said digital elements from the output of said digital encoder means to the input of said buffer means in accordance with a function which varies inversely with respect to the rate of occurrence of said extremal points.
The method of transmitting in digital format the extremal points of an analog wave comprising:
- encoding each of said extremal points into a digital word having a predetermined number of digital elements;
- determining the rate of occurrence of said extremal points;
- and transmitting a variable number of the most significant binary elements of said digital words in accordance with a function which varies inversely with respect to said rate of occurrence of said extremal points.
Dependencies are inferred from the claim text.