Digital autostart circuit
OwnerJames A. Scharfe, Jr.inventor
Life of this patent
Estimating the term…
Abstract
A terminal unit having a digital autostart circuit for energizing an output device such as a teleprinter. The autostart circuit responds only to the space character which is transmitted between every word in the commonly used Murray and ASCII codes. A method for detecting the presence of information signals encoded in the Murray and ASCII codes wherein a predetermined bit of each incoming signal is inverted and the binary states of each bit of incoming character are sensed to determine the presence of the space character.
Claims44
An autostart circuit for energizing an output device in response to at least one Space character in a series of signals representative of information characters, the information characters including groups of information characters each separated from other such groups by Space characters, each said information character and Space character having the same number of bits and a unique combination of binary states, said autostart circuit comprising:
- a. means for sensing the reception of each Space character;
- and
- b. means for generating a first output signal in response to at least one sensed Space character for energizing the output device.
A method for energizing an output device in response to at least one Space character in a series of signals which are representative of a plurality of information characters including Space characters separating groups of information characters in said plurality comprising:
- a. sensing the reception of each Space character:
- b. generating a first output signal in response to each Space character sensed for energizing the output device.
In a terminal unit for converting a plurality of digital information characters from audio signals received from a radio receiver to digital pulses which are transmitted to an output device for presentation of said information characters in human understandable form, each said information character having the same number of bits but different predetermined binary states, said terminal unit including an autostart circuit for automatically energizing the output device in response to the reception of said information characters and for deenergizing the output device upon the conclusion of a message, the improvement comprising a circuit for detecting Space characters which includes:
- a. means for inverting one of the bits of each said information characters to produce logic signals equal in number to said number of bits;
- b. means for sensing when said logic signals all have the same predetermined binary state;
- and
- c. means for generating a first output signal only in response to said logic signals all having the same predetermined binary state to indicate the detection of the Space information character, said first output signal coupled to said autostart circuit for energizing the output device.
Dependencies are inferred from the claim text.