APPARATUS FOR RECEIVING A FREQUENCY AND PHASE CODED VEHICLE CONTROL SIGNAL

• US 3,810,161 A
• Filed: 03/15/1973
• Issued: 05/07/1974
• Est. Priority Date: 03/15/1973
• Status: Expired due to Term

• Current Assignee: AEG Westinghouse Transportation Systems, Inc. (Alstom SA)
• Original Assignee: Arun P. Sahasrabudhe
• Inventors: Sahasrabudhe, Arun P.
• Primary Examiner(s): Pitts, Harold I.
• Application Number:
  US05/341,647
• Time in Patent Office: 418 Days
• Field of Search: 340/17R,147PC
• US Class Current: 340/13.1
• CPC Class Codes: H04L 27/10 Frequency-modulated carrier systems, i.e. using frequency-shift keying H04L27/32 takes precedence
• CPC Class Codes: H04L 7/065 and superimposed by modulation

Abstract

A vehicle control signal, for example a vehicle speed command, is binary coded wherein the message content is frequency coded such that a binary one indication is at a first frequency and a binary zero indication is a second frequency. Timing information is phase coded, such that a shift in phase of a binary indication is indicative of a change from one bit to the next of the vehicle control signal. The vehicle control signal is received and is then shifted in phase an angular amount phi . The received signal and the phase shifted signal are then multiplied together yielding a vehicle control signal proportional to Cos phi . For each sensed change of frequency, or in the absence of a change of frequency a shift of phase, a timing pulse is provided. The message content of the Cos phi signal is also sensed, the sensed message is synchronized with the timing pulses to provide a synchronized vehicle control signal.

Claims

1. In a signal receiving system responsive to a provided binary coded message, wherein the message information is frequency coded and the timing information is phase coded, the combination comprising:

means for shifting said provided binary coded message in phase an angular amount phi ;

means responsive to said provided binary coded message and the shifted binary coded message for providing a binary coded message proportional to Cos phi and means responsive to said binary coded message proportional to Cos phi for detecting the message information content and the timing information content therein.

2. In a signal receiving system, the combination comprising:

means for providing a binary coded message, wherein the message content is frequency coded and the timing content is phase coded;

means for providing a binary coded message shifted in phase an angular amount phi in response to the provision of said binary coded message;

means responsive to the concurrent provision of said binary coded message and said binary coded message shifted in phase an angular amount phi for providing a binary coded message proportional to Cos phi ; and

means responsive to said binary coded message proportional to Cos phi for decoding same to provide a first signal indicative of the message content therein, and a second signal indicative of the timing content therein.

3. In a signal receiving system, the combination comprising:

means for providing a first coded message having message content and timing content;

means for delaying said first coded message for providing a second coded message;

means for providing a third coded message in response to multiplying said first coded message with said second coded message;

means responsive to the provision of said third coded message for detecting the message content therein; and

means responsive to the provision of said third coded message for detecting the timing content therein.

4. In a signal receiving system responsive to a provided binary coded message, wherein the message information is frequency coded such that a binary ONE indication is at a first frequency and a binary ZERO indication is at a second frequency, and the timing information is phase coded such that a shift in phase of a binary indication is indicative of a change from one bit time to the next, the combination comprising:

means responsive to the provision of said provided binary coded message for shifting same in phase an angular amount phi ;

means responsive to the provision of said binary coded message and the shifted binary coded message shifted in phase an angular amount phi for providing a binary coded message proportional to Cos phi ;

means responsive to each shift in phase of a binary indication for providing a timing signal;

means responsive to said timing signal and each binary indication in said binary signal coded message proportional to Cos phi for detecting the message information in said binary coded message proportional Cos phi .

5. In a signal receiving system responsive to a provided binary coded message, wherein the message information is frequency coded such that a binary ONE indication is at a first frequency and a binary ZERO indication is at a second frequency, and the timing information is phasE coded such that a shift in phase of a binary indication is indicative of a change from one bit time to the next, the combination comprising:

means responsive to the binary ONE indications in said provided binary coded message for shifting the binary ONE indications an angular amount phi ;

means responsive to the binary ZERO indications in said provided binary coded message for shifting the binary ZERO indications an angular amount phi ;

means responsive to the shifted binary ONE and ZERO indications and the provided binary coded message for providing a binary coded message proportional to Cos phi ;

means responsive to either a shift in phase or a change in frequency for providing a timing signal;

means responsive to the provision of said binary coded message proportional to Cos phi for detecting the message content therein; and

means responsive to the concurrent provision of the detected message content of said binary coded message proportional to Cos phi and said timing signal for providing a decoded message synchronized with said timing signal.

6. The combination claimed in claim 5 wherein the last named means comprises a bistable device.

7. In a system for receiving coded vehicle control signals, the combination comprising:

means for providing a binary coded vehicle control signal wherein the message content is frequency coded and the timing content is phase coded;

means for shifting said binary coded vehicle control signal an angular amount phi ;

means for providing a binary coded vehicle control signal proportional to Cos phi in response to the concurrent provision of said provided binary coded vehicle control signal and the shifted binary coded vehicle control signal; and

means for providing a decoded vehicle control signal in response to the provisions of said binary coded vehicle control signal proportional to Cos phi .

8. The combination claimed in claim 7 including:

means for providing a timing signal in response to sensing a phase shift.

9. The combination claimed in claim 8 including:

means for providing a synchronized vehicle control signal which is synchronized with said timing signal, in response to the provision of said decoded vehicle control signal and said timing signal.

10. In a signal receiving system responsive to a provided binary coded vehicle control message, wherein the message information is frequency coded such that a binary ONE indication is at a first frequency, and a binary ZERO indication is at a second frequency, and the timing information is phase coded such that a shift in phase of a binary indication is indicative of a change from one bit time to the next, the combination comprising:

means responsive to said provided binary coded vehicle control message for shifting same in phase an angular amount phi ;

means responsive to the provision of said provided binary coded vehicle control message and the phase shifted binary coded vehicle control message for providing a binary coded vehicle control message proportional to Cos phi ;

means responsive to each shift in phase of a binary indication for providing a timing signal; and

means responsive to said timing signal and each binary indication in said binary coded vehicle control message proportional to Cos phi for detecting the message information therein.