# US 5,349,585 A · Method for transmitting two digital signals which are independent of one another

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- Number: US 5,349,585 A
- Document ID: US5349585A
- Status: Granted
- Kind: A
- Application number: 08/087,881
- Filed: 1993-07-09
- Granted: 1994-09-20
- Earliest claimed: 1992-07-17
- Assignees: Siemens Aktiengesellschaft
- Inventors: Peter Soukal
- Web page: https://patentgrep.com/patent/US5349585A

## CPC

- H04L 25/4904: {using self-synchronising codes, e.g. split-phase codes}
- H04J 99/00: Subject matter not provided for in other groups of this subclass
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)

## Abstract

A method for transmitting two digital signals includes utilizing an encoder to generate a pulse of a fixed width in a coded signal each time a positive going 0-1 transmission is detected in the pulse channel. The polarity of the pulse generated by the encoder is defined by a signal present at the signal channel input. The two digital signals are separated after transmission by a decoder which utilizes the time between two successive level changes. A signal edge in the coded signal initiates a time measurement by the decoder and when a further signal edge appears within a fixed time limit then a signal is allocated to the pulse channel. When, instead, no further signal edge appears within this time limit, the signal is allocated to the signal channel of the decoder.

## Claims

### Claim 1

A method for transmitting two digital signals that are independent of one another via a common channel, comprising the steps of:
transmitting a first and second signal including:
supplying said first signal to a pulse channel of an encoder;
supplying said second signal to a signal channel of the encoder;
generating a pulse of fixed width in a coded signal at an output of the encoder for transmission upon every level transition of said first signal;
defining a polarity of said pulse in said coded signal for transmission by said second signal;
receiving said first and second signals including:
separating said coded signal into said first and second signals by using time measurements between two successive level changes in said coded signal;
starting a time measurement at one signal edge of said coded signal;
allocating said coded signal to a pulse channel of a decoder when a further signal edge appears in said coded signal within a fixed time limit; and
allocating said coded signal to a signal channel of the decoder when no further signal edge appears in said coded signal within said fixed time limit.

### Claim 2 (depends on 1)

A method as claimed in claim 1, further comprising the step of:
transmitting said coded signal via a light waveguide.

### Claim 3 (depends on 1)

A method as claimed in claim 1, further comprising the steps of:
transmitting said coded signal from one sub-component to another sub-component of an x-ray generator.