Simulcast transmission system

• US 4,255,814 A
• Filed: 06/11/1979
• Issued: 03/10/1981
• Est. Priority Date: 07/15/1977
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Osborn, James L.
• Primary Examiner(s): Ng, Jin F.
• Application Number:
  US06/047,508
• Time in Patent Office: 638 Days
• Field of Search: 455/8-10, 455/15, 455/16, 455/33, 455/49-53, 455/57, 370/100, 370/108
• US Class Current: 455/503
• CPC Class Codes: H04B 7/24 for communication between two or more posts wireless communication networks H04W
• CPC Class Codes: H04H 20/67 Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency

Abstract

A system of the type wherein transmissions of the same information are simultaneously broadcast by spatially removed transmitter sites. A control center establishes transmission links to the transmitter sites. The center includes electronic storage which supplies the required time delay for each signal applied over a predetermined link to assure phase coherency of overlapping transmissions. Upon the establishment of a new link, a new set of time delays is recalled from memory and used to program a bucket brigade to thereby provide the required delay to signals carried over the link.

Claims

1. A simulcast transmission system for the simultaneous transmission of information signals comprising:

a plurality of simulcast transmitter sites, each being located at a predetermined position, and each including means for receiving and retransmitting information signals; and

control means for establishing transmission links among said simulcast transmitter sites, said control means including means for receiving said information signals and providing a predetermined time delay thereto for each information signal transmitted over a link such that simultaneous transmissions from overlapping coverage area simulcast transmitter sites, each serviced by a different link, are in phase coherency, said control means further comprising means to store the necessary time delay required for each link and for automatically recalling said stored time delay value and provide the required time delay to signals passed over newly established links.

2. The system of claim 1 wherein the means for providing the time delay to said information signals includes a bucket brigade device.