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Tone relay system and method

A relay system and tone technology, used in hybrid switch systems, repeater circuits, and hybrid transportation, etc., can solve the problems of not being able to immediately determine the existence of the tone, sending an error RFC2833 to end the packet, and affecting the transmission.

Inactive Publication Date: 2012-04-18
NXP USA INC
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Problems solved by technology

[0005] However, a false DTMF detection may result in, for example, sending a wrong RFC 2833 start packet, or a DTMF interruption may cause a wrong RFC 2833 end packet to be sent, thus potentially affecting ongoing transmissions
[0006] Furthermore, known DTMF detectors suffer from "DTMF leakage" which can effectively become additive to a given DTMF signal due to an indeterminate period of state in which the presence of a tone cannot be immediately determined, thereby prolonging the duration of the given DTMF signal

Method used

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  • Tone relay system and method
  • Tone relay system and method
  • Tone relay system and method

Examples

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Embodiment Construction

[0024] refer to figure 1 , a schematic block diagram of an example of an embodiment of the tone relay system 10 is shown. The tone relay system 10 includes a tone detector 12 arranged to receive a sequence of signal samples and to provide a plurality of media descriptors, each media descriptor comprising a cell (cell) of one or more of the signal samples. ) and pitch detection meta information for the unit. Furthermore, the tone relay system 10 comprises a tone relay module 14 which is arranged to: receive each media descriptor; perform an evaluation of the meta-information and when the result of the evaluation indicates an undetermined tone state according to a or a plurality of previous media descriptors to modify the meta-information; and providing the media descriptor to the tone aggregator module 16 with a predetermined delay when the meta-information indicates a tone, for transmission over the network, otherwise without a predetermined time delay The media descriptors ...

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Abstract

A tone relay system (10) comprises a tone detector (12) arranged to receive a sequence of signal samples and to provide a plurality of media descriptors, each media descriptor comprising a cell of one or more of the signal samples and a tone detection meta-information for the cell; and a tone relay module (14) arranged to receive each media descriptor, to perform an evaluation of the meta-information and modify the meta-information depending on one or more preceding media descriptors when a result of the evaluation indicates an undetermined tone state, and to provide the media descriptors with a predetermined delay to a tone aggregator module (16), when the meta-information indicates a tone, for transmission over a network, and to provide the media descriptors without the predetermined time delay to an encoder module (18), for transmission over the network, otherwise.

Description

field of invention [0001] The present invention relates generally to the transmission of tones, and more particularly to tone relay systems and methods. The invention also relates to an IP voice transmission system. Background of the invention [0002] Packet-switched communication networks may be used, for example, for the communication of voice or audio data. For this purpose, a transport protocol such as the Real-time Transport Protocol (RTP) is available. For Internet Protocol (IP) telephony systems or Voice over Internet Protocol (VoIP) transmission systems, for example when a user needs to interact with an automated system such as an automated call directing system, it may be desirable to transmit Dual Tone Multi-Frequency (DTMF) signals over the network. [0003] Typically, speech data is provided to a vocoder (speech coder) at the transmitter side. The vocoder employs a compression algorithm in order to reduce the bandwidth of voice data transmitted over the netwo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B3/36H04L12/66
CPCH04L12/6418
Inventor 米哈伊·乌德武列亚努约恩·德拉戈什
Owner NXP USA INC
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