Voice over internet protocol system having dynamic gain control function and method thereof

• US 7,535,892 B2
• Filed: 02/17/2004
• Issued: 05/19/2009
• Est. Priority Date: 02/17/2003
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Chun, Joon-Sung
• Primary Examiner(s): Al Aubaidi; Rasha S
• Application Number:
  US10/778,393
• Publication Number:
  US 20050259636A1
• Time in Patent Office: 1,918 Days
• Field of Search: 370352-356
• US Class Current: 370/352
• CPC Class Codes: H04M 2203/2066 Call type detection of indication, e.g. voice or fax, mobile of fixed, PSTN or IP
• CPC Class Codes: H04M 3/40 Applications of speech amplifiers
• CPC Class Codes: H04M 3/42314 in private branch exchanges
• CPC Class Codes: H04M 7/006 Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42
• CPC Class Codes: H04M 7/125 Details of gateway equipment

Abstract

A Voice over Internet Protocol (VoIP) system having a dynamic gain control function and a method for providing a gain dynamically using the same system wherein, in the process that Pulse Code Modulation (PCM) data are transformed into a VoIP packet or vice versa, a gain value is dynamically assigned according to the type of terminal equipment utilized and the PCM voice data can be amplified and outputted according to the assigned gain value. The system includes a private exchange having a gain table and a VoIP gateway for the receiving the gain value from the private exchange in order to amplify the PCM voice and transform the amplified PCM voice data into the VoIP packet or convert VoIP packets to PCM voice data and amplifying the PCM voice data.

Claims

1. A Voice over Internet Protocol (VoIP) system having a dynamic gain control function and a communication path between a first terminal, the first terminal being an extension telephone of a private exchange, and second terminal of a type operating according to an Internet protocol, the communication path comprising a VoIP gateway connected to said private exchange, and a gatekeeper connected between said VoIP gateway and the second terminal, said VoIP system comprising:

said private exchange including a gain table of gain values and transmitting one of said gain values to said VoIP gateway; and

said VoIP gateway receiving the gain value from the private exchange, storing the gain value, amplifying PCM voice data transmitted from the private exchange according to the stored gain value, transforming the amplified PCM voice data into a VoIP packet, transmitting the VoIP packet to said second terminal, transforming VoIP packets transmitted from the said second terminal into transformed PCM voice data, amplifying the transformed PCM voice data according to the stored gain value, and transmitting the amplified PCM voice data to said first terminal of the private exchange.

2. The VoIP system as set forth in claim 1, said gain value being determined based on whether said first terminal is an analog extension telephone or a digital extension telephone.

3. The VoIP system as set forth in claim 1, said gain value being determined based on a type of Internet protocol equipment said second terminal comprises.

4. The VoIP system as set forth in claim 1, said gain value being determined based on whether said second terminal is an Internet telephone or another VoIP gateway.

5. The VoIP system as set forth in claim 1, each said gain value of said gain table being based on whether said first terminal is an analog extension telephone or a digital extension telephone and whether said second terminal is an Internet telephone or another VoIP gateway, the gain value transmitted from said private exchange to said VoIP gateway being determined based on whether said first terminal is an analog extension telephone or a digital extension telephone and whether said second terminal is an Internet telephone or another VoIP gateway.

6. The VoIP system as set forth in claim 1, said gain value being transmitted to said VoIP gateway during transmission of a call setup message between said first and second terminals.

7. The VoIP system as set forth in claim 1, said VoIP gateway comprising:

a Public Switched Telephone Network (PSTN) connector for providing an interface with the private exchange to enable reception and transmission of the PCM voice data;

an Internet network connector for connecting said VoIP gateway to said gatekeeper via an Internet network to enable reception and transmission of the VoIP packets;

a media processor for a) amplifying the PCM voice data from the private exchange through the PSTN connector according to the stored gain value when a call setup is completed, transforming the amplified PCM voice data into the VoIP packet and transmitting the VoIP packet to the second terminal through the Internet network connector, and b) transforming the VoIP packets transmitted from the second terminal through the Internet network connector into the PCM voice data, amplifying the transformed PCM voice data according to the stored gain value, and transmitting the amplified PCM voice data to the private exchange through the PSTN connector; and

a main controller for receiving the gain value from the private exchange through the PSTN connector, storing the gain value, and providing the media processor with the stored gain value when the call setup is completed.

8. The VoIP system as set forth in claim 7, wherein the media processor comprises:

a memory for storing the gain value provided by the main controller when the call setup is completed; and

a digital signal processor for a) amplifying the PCM voice data according to the gain value stored in said memory when the call setup is completed, transforming the amplified data into the VoIP packet and transmitting the VoIP packet to the Internet network connector, and b) transforming the VoIP packets received through the Internet network connector into the PCM voice data, amplifying the transformed PCM voice data according to the gain value stored in said memory and transmitting the amplified PCM voice data to the PSTN connector; and

a central processing unit for receiving the gain value from the main controller, storing the gain value in the memory, and providing the digital signal processor with the gain value stored in said memory when the call setup is completed.

9. The VoIP system as set forth in claim 8, said gain value being transmitted from said private exchange to said VoIP gateway during transmission of a call setup message over said communication path between said first and second terminals.

10. A Voice over Internet Protocol (VoIP) system having a dynamic gain control function and a communication path between a first terminal, the first terminal being an extension telephone of a private exchange, and second terminal of a type operating according to an Internet protocol, the communication path comprising a VoIP gateway connected to said private exchange, and a gatekeeper connected between said VoIP gateway and the second terminal, said VoIP system comprising:

said gatekeeper including a gain table of gain values and transmitting one of said gain values to said VoIP gateway; and

said VoIP gateway receiving the gain value from the gatekeeper, storing the gain value, amplifying PCM voice data transmitted from the private exchange according to the stored gain value, transforming the amplified PCM voice data into a VoIP packet, transmitting the VoIP packet to said second terminal, transforming VoIP packets transmitted from the said second terminal into transformed PCM voice data, amplifying the transformed PCM voice data according to the stored gain value, and transmitting the amplified PCM voice data to said first terminal of the private exchange.

11. The VoIP system as set forth in claim 10, said gain value being determined based on whether said first terminal is an analog extension telephone or a digital extension telephone.

12. The VoIP system as set forth in claim 10, said gain value being determined based on a type of Internet protocol equipment said second terminal comprises.

13. The VoIP system as set forth in claim 10, said gain value being determined based on whether said second terminal is an Internet telephone or another VoIP gateway.

14. The VoIP system as set forth in claim 10, each said gain value of said gain table being based on whether said first terminal is an analog extension telephone or a digital extension telephone and whether said second terminal is an Internet telephone or another VoIP gateway, the gain value transmitted from said gatekeeper to said VoIP gateway being determined based on whether said first terminal is an analog extension telephone or a digital extension telephone and whether said second terminal is an Internet telephone or another VoIP gateway.

15. The VoIP system as set forth in claim 10, said gain value being transmitted to said VoIP gateway during transmission of a call setup message between said first and second terminals.

16. The VoIP system as set forth in claim 10, said VoIP gateway comprising:

a Public Switched Telephone Network (PSTN) connector for providing an interface with the private exchange to enable reception and transmission of the PCM voice data;

an Internet network connector for connecting said VoIP gateway to said gatekeeper via an Internet network to enable reception and transmission of the VoIP packets;

a media processor for a) amplifying the PCM voice data from the private exchange through the PSTN connector according to the stored gain value when a call setup is completed, transforming the amplified PCM voice data into the VoIP packet and transmitting the VoIP packet to the second terminal through the Internet network connector, and b) transforming the VoIP packets transmitted from the second terminal through the Internet network connector into the PCM voice data, amplifying the transformed PCM voice data according to the stored gain value, and transmitting the amplified PCM voice data to the private exchange through the PSTN connector; and

a main controller for receiving the gain value from the gatekeeper through the Internet network connector, storing the gain value, and providing the media processor with the stored gain value when the call setup is completed.

17. The VoIP system as set forth in claim 16, wherein the media processor comprises:

a memory for storing the gain value provided by the main controller when the call setup is completed; and

a digital signal processor for a) amplifying the PCM voice data according to the gain value stored in said memory when the call setup is completed, transforming the amplified data into the VoIP packet and transmitting the VoIP packet to the Internet network connector, and b) transforming the VoIP packets received through the Internet network connector into the PCM voice data, amplifying the transformed PCM voice data according to the gain value stored in said memory and transmitting the amplified PCM voice data to the PSTN connector; and

a central processing unit for receiving the gain value from the main controller, storing the gain value in the memory, and providing the digital signal processor with the gain value stored in said memory when the call setup is completed.

18. The VoIP system as set forth in claim 17, said gain value being transmitted from said gatekeeper to said VoIP gateway during transmission of a call setup message over said communication path between said first and second terminals.

19. A method of controlling a dynamic gain control function in a Voice over Internet Protocol (VoIP) system having a communication path between a first terminal, the first terminal being an extension telephone of a private exchange, and second terminal of a type operating according to an Internet protocol, the communication path comprising a VoIP gateway connected to said private exchange, and a gatekeeper connected between said VoIP gateway and the second terminal, said method comprising steps of:

transmitting a call setup message to said VoIP gateway, said call setup message including a gain value;

storing said gain value in a memory of said VoIP gateway;

amplifying PCM voice data transmitted from the private exchange according to the stored gain value, when call setup is completed, transforming the amplified PCM voice data into a VoIP packet and transmitting the VoIP packet to said second terminal; and

transforming VoIP packets transmitted from the said second terminal into transformed PCM voice data, when the call setup is completed, amplifying the transformed PCM voice data according to the stored gain value, and transmitting the amplified PCM voice data to said first terminal of the private exchange.

20. The method as set forth in claim 19, the step of transmitting a call setup message to said VoIP gateway comprising:

determining a whether said first terminal is an analog extension telephone or a digital extension telephone;

checking a gain table in said branch exchange for a gain value to be transmitted to said VoIP gateway based on the determination of whether said first terminal is the analog extension telephone or the digital extension telephone; and

attaching said gain value to the call setup message.

21. The method as set forth in claim 19, the step of transmitting a call setup message to said VoIP gateway comprising:

determining a whether said first terminal is an analog extension telephone or a digital extension telephone;

checking a gain table in said gatekeeper for a gain value to be transmitted to said VoIP gateway based on the determination of whether said first terminal is the analog extension telephone or the digital extension telephone; and

attaching said gain value to the call setup message.

22. The method as set forth in claim 19, the step of transmitting a call setup message to said VoIP gateway comprising:

determining a whether said second terminal is an Internet telephone or another VoIP gateway;

checking a gain table in said branch exchange for a gain value to be transmitted to said VoIP gateway based on the determination of whether said second terminal is the Internet telephone or another VoIP gateway; and

attaching said gain value to the call setup message.

23. The method as set forth in claim 19, the step of transmitting a call setup message to said VoIP gateway comprising:

determining a whether said second terminal is an Internet telephone or another VoIP gateway;

checking a gain table in said gatekeeper for a gain value to be transmitted to said VoIP gateway based on the determination of whether said second terminal is the Internet telephone or another VoIP gateway; and

attaching said gain value to the call setup message.

24. The method as set forth in claim 19, the step of transmitting a call setup message to said VoIP gateway comprising:

checking a gain table in said branch exchange for a gain value to be transmitted to said VoIP gateway based on whether said first terminal is an analog extension telephone or a digital extension telephone and whether said second terminal is an Internet telephone or another VoIP gateway; and

attaching said gain value to the call setup message based on whether said first terminal is an analog extension telephone or a digital extension telephone and whether said second terminal is an Internet telephone or another VoIP gateway.

25. The method as set forth in claim 19, the step of transmitting a call setup message to said VoIP gateway comprising:

checking a gain table in said gatekeeper for a gain value to be transmitted to said VoIP gateway based on whether said first terminal is an analog extension telephone or a digital extension telephone and whether said second terminal is an Internet telephone or another VoIP gateway; and

attaching said gain value to the call setup message based on whether said first terminal is an analog extension telephone or a digital extension telephone and whether said second terminal is an Internet telephone or another VoIP gateway.