Method and apparatus for acoustic ECHO cancellation in a communication system providing TTY/TDD service

A communication system, echo technology, applied in transmission system, wireless communication, telephone communication and other directions, can solve problems such as influence

Inactive Publication Date: 2004-06-23
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, the echo generated from the landline 111 affects the TTY / TDD device 101

Method used

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  • Method and apparatus for acoustic ECHO cancellation in a communication system providing TTY/TDD service
  • Method and apparatus for acoustic ECHO cancellation in a communication system providing TTY/TDD service
  • Method and apparatus for acoustic ECHO cancellation in a communication system providing TTY/TDD service

Examples

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no. 1 example

[0030] Figure 3A The configuration of a system for canceling an echo generated from a communication system providing a TTY / TDD service according to a first embodiment of the present invention is shown. Figure 3B yes Figure 3A A block diagram of the BS vocoder 105 shown in .

[0031] refer to Figure 3B ,remove figure 1 In addition to the decoder 105a and encoder 105b of the BS vocoder 105 shown, the BS vocoder 105 of the present invention includes a TTY / TDD text detector 115, a null packet generator 117, and a switch SW. Packets received from the TTY / TDD phone 103 are applied to the input of the decoder 105a and the TTY / TDD text detector 115 . Decoder 105a decodes the packets and outputs the PCM signal to Mobile Switching Center (MSC) 107 . If the packet contains TTY / TDD text, the TTY / TDD text detector 115 detects the TTY / TDD text, and outputs a detection message indicating the detection result. The PCM signal received from MSC 107 is applied to the input of encoder 1...

no. 2 example

[0038] Figure 5A The configuration of a system for canceling an echo generated from a communication system providing a TTY / TDD service according to a second embodiment of the present invention is shown. Figure 5B yes Figure 5A A block diagram of the BS vocoder 309 shown in .

[0039] refer to Figure 5B , according to an embodiment of the present invention, except Figure 2A with 2B In addition to the decoder 309a and encoder 309b of the BS vocoder 105 shown, the BS vocoder 309 includes a TTY / TDD text detector 315, a delay calculator 317, a PCM silence generator 319, and a switch SW. The PCM signal received from MSC 307 is applied to the input of encoder 309 a and TTY / TDD text detector 315 . Encoder 309a encodes the PCM signal and outputs packets to TTY / TDD phone 311 .

[0040] If the PCM signal contains TTY / TDD text, the TTY / TDD text detector 315 detects the TTY / TDD text and outputs a detection message representing the detection result. The delay count of the delay ...

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Abstract

A method and apparatus are disclosed for canceling acoustic echo generated during transmission of text information in a communication system supporting a TTY / TDD service. When an mobile-to-land call is established between a mobile subscriber and a PSTN subscriber, a decoder notifies an encoder of detection of TTY / TDD text in a BS vocoder. The encoder then transmits a packet having silence information, which prevents acoustic echo reproduction of the text in the TTY / TDD device.

Description

technical field [0001] The present invention relates to enhancing communication capabilities in communication systems in general, and in particular to methods and devices for canceling echoes in communication systems providing TTY / TDD services. Background technique [0002] Communication technologies, specifically mobile communication technologies, have been developed to provide data services in addition to voice services. The communication system provides additional services to meet the requirements of different users. One of the additional services is the TTY / TDD service. The term "TTY" is derived from "Teletype", which is a registered trademark of Teletype Corporation. "TDD" is an acronym for the phrase "telecommunication device for deaf". TTY / TDD made it possible for deaf or hard of hearing people to make phone calls. [0003] Execution of TTY / TDD services requires a TTY / TDD device. The TTY / TDD device includes a keyboard, a MODEM (modulator / de...

Claims

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Application Information

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IPC IPC(8): H04M3/00H04B3/23H04M3/42H04M9/08H04M11/00H04W88/18
CPCH04M3/42391H04M9/082H04W88/181H04B3/23H04M11/00
Inventor 丘钉宇朴炳建
Owner SAMSUNG ELECTRONICS CO LTD
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