Message generator for a controlled radio transmitter and receiver

• US 4,027,243 A
• Filed: 05/12/1975
• Issued: 05/31/1977
• Est. Priority Date: 05/12/1975
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: General Electric Company
• Inventors: Taylor, Theodore E., Stackhouse, Bill L.
• Primary Examiner(s): Safourek, Benedict V.
• Assistant Examiner(s): Ng, Jin F.
• Application Number:
  US05/576,383
• Time in Patent Office: 750 Days
• Field of Search: 325/4, 325/5, 325/51, 325/53, 325/54, 325/55, 325/58, 325/64, 325/302, 343/179, 178/69.1, 179/15 BS, 179/41 A, 328/63, 340/147 SY
• US Class Current: 375/365
• CPC Class Codes: H04L 1/0078 Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location forward error control, e.g. FEC, CRC H04L1/004; adaptive formatting H04L1/0006; mappings H04L27/00
• CPC Class Codes: H04L 25/4904 using self-synchronising codes, e.g. split-phase codes
• CPC Class Codes: H04L 5/00 Arrangements affording multiple use of the transmission path
• CPC Class Codes: H04W 56/00 Synchronisation arrangements

Abstract

In a radio communication system having a command or base station and one or more controlled stations, the base station transmits outbound binary function messages to the controlled stations in order to make an inquiry or give a command to one or all of the controlled stations. The controlled station responds with an inbound binary message. The outbound messages comprise a sequence of binary bits at a first rate and having a first synchronizing word of nine bits, a first address word having eight message bits and four parity bits and produced three times, a second synchronizing word that is the binary inversion of the first synchronizing word, a second address word having eight message bits and four parity bits and produced three times, a third synchronizing word that is the binary inversion of the first synchronizing word, and a command word having eight message bits and four parity bits and produced three times. If a controlled station receives and recognizes its address, it transmits a response in the form of an inbound message having a sequence of binary bits at a rate that is 11/2 times the rate of the outbound message. The inbound message comprises a sequence of a plurality of binary preamble bits of different values, the first synchronizing word, the first address word produced three times, the second synchronizing word, the second address word produced three times, the third synchronizing word, and a response word having eight message bits and four parity bits and produced three times.

Claims

1. For use in radio communication system having a command station transmitter for transmitting outbound messages, each outbound message being formed by a sequence of binary bits at a first rate and comprising a first synchronizing word of nine bits, a first address word of eight message bits and four parity bits and produced at least three times, a second synchronizing word of nine bits that are the binary inversion of said nine bits of said first synchronizing word, a second address word of eight message bits and four parity bits and produced at least three times, a third synchronizing word of nine bits that are the binary inversion of said nine bits of said first synchronizing word, and a command word of eight message bits and four parity bits and produced at least three times;

a command station receiver;

a controlled station transmitter; and

a controlled station receiver for receiving outbound messages from said command station transmitter, a message generator comprising;

a. first means for connection to said controlled station receiver for deriving a received outbound message transmitted by said command station transmitter, and received by said controlled station receiver;

b. second means connected to said first means for producing an inbound message only in response to a predetermined outbound message, said inbound message being formed by a sequence of binary bits at a second rate that is one and one half times said first rate and comprising a synchronizing preamble having a plurality of different binary bits, said first synchronizing word, said first address word produced at least three times, said second synchronizing word, said second address word produced at least three times, said third synchronizing word, and a response word of eight message bits and four parity bits and produced at least three times;

c. and third means connected to said second means for applying said produced inbound message to said controlled station transmitter.

2. The improved function control apparatus of claim 1 wherein said first synchronizing word comprises nine bits having the binary values 011100100.

3. The improved function control apparatus of claim 1 wherein said first synchronizing word comprises nine bits having the binary values 001001110.