System for Surveillance and a Method for the Application Thereof

• US 20080122938A1
• Filed: 06/20/2005
• Published: 05/29/2008
• Est. Priority Date: 06/18/2004
• Status: Abandoned Application

• Current Assignee: Emwitech Holding AB
• Original Assignee: Emwitech Holding AB
• Inventors: Svensson, Magnus, Gilda, Torbjorn, Broberg, Patrick
• Application Number:
  US11/630,094
• Publication Number:
  US 20080122938A1
• Time in Patent Office: Days
• US Class Current: 348/222.1
• CPC Class Codes: G08B 25/01 characterised by the transmission medium
• CPC Class Codes: H04W 40/22 using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and a system (100) for transmission of a large amount of data over a first dedicated wireless link (A) at a first frequency, such as 2.4 GHz. If the signal strength is weak, the data is further compressed. If the signal strength is further weaker, a second wireless link (B) is used at a second frequency, such as 868 MHZ. The second wireless link (B) is at the same time used as a network system for exchange of information in which the nodes of the system operates as nodes in a multi-hop system.

Claims

1. A method for transmission of a large amount of information, such as images, videos and sound, over a radio frequency link, the method comprising performing the transmission:

i) on a first frequency at normal signal quality of the transmission and at full rate of the information;

ii) on the first frequency but with the information being further compressed when the signal quality of the transmission is below the normal signal quality; and

iii) on a second frequency when the transmission on the first frequency is substantially impossible.

2. The method according to claim 1, wherein the compression of the information is performed in several steps, depending on the signal quality and the number of hops during transmission during the steps ii) and iii).

3. The method according to claim 1 wherein transmission at the second frequency takes place over several nodes in a multi-hop network in a predetermined path.

4. The method according to claim 2 wherein the transmission takes place in both directions.

5. The method according to claim 1, wherein the information comprises image information, characterized by compressing the image information according to JPEG-standard including a header, and removing the header before transmission.

6. The method according to claim 1, further comprising removing the header during the steps ii) and iii).

7. The method according to claim 1, wherein the image information is obtained by a camera unit and sent to a connection unit, comprising steps of:

—

receiving configuration information from the connection unit for a processor of the camera unit,—

applying power to the processor,—

performing a configuration task,—

sending information to the connection unit via a CPU when the task is completed, and—

powering down the processor.

8. The method according to claim 7, comprising steps of:

—

providing power by a first battery to the CPU (21), an external sensor, and a power management unit,—

providing power by a second battery to the processor, a memory and camera chips, and—

connecting the two batteries in parallel at low voltage or when higher current is required.

9. A system comprising a radio module transmitting at a first frequency and having a first bandwidth, wherein the system comprises an additional radio module transmitting at a second frequency having a second bandwidth, which is smaller than the first bandwidth.

10. The system according to claim 9, wherein the additional radio module is a multi-hop radio module.

11. The system according to claim 9 wherein the system comprises at least one camera having at least one camera chip.