Busy tone detecting method and apparatus

A technology of busy tone detection and audio, which is applied in the direction of monitoring/monitoring/test arrangement, etc., can solve the problems of occupying large software and hardware resources, high cost, instability, etc., and achieve the effect of simple implementation, low cost and reliable cost

Inactive Publication Date: 2008-09-24
ZTE CORP
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Problems solved by technology

Since the LM567 chip and its peripheral resistance devices are greatly affected by temperature, this method is unstable and not flexible enough
[0004] In addition, a method for automatically detecting busy tone signals is disclosed in the Chinese patent with the publication number CN1383315, which can identify various busy tone frequencies through self-training, but it needs to occupy a large amount of software and hardware resources, and the cost is too high. for special occasions

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  • Busy tone detecting method and apparatus
  • Busy tone detecting method and apparatus

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Embodiment Construction

[0037] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0038] figure 1 It is a schematic diagram of the composition and structure of the busy tone detection device of the present invention, as figure 1 As shown, the busy tone detection device of the present invention includes an audio detection unit 10 and a busy tone judgment unit 11, wherein the audio detection unit 10 includes a first level discrimination and trigger module 100, a high frequency clock source 101, a first high level counter 102, A first low level counter 103 , a busy tone audio judgment module 104 and an indication signal output module 105 . Wherein, the first level discrimination and triggering module 100 is used for discriminating the high level and low level of each sign bit in the input speech signal to be detected, and triggers the first high level counter 102 or the first high level counter 102 according to the level of each sign bit The first ...

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Abstract

The invention discloses a busy tone detecting method which includes the steps that A. the frequency of speech signals is tested to judge whether the frequency of the speech signals is the audio frequency of the busy tone or not and an indication signal of a judgment result is output; B. the response period and the duty ratio of the speech signal are detected by using the indication signal of the judge result; C. according to the response time and the duty ratio detected in the step B, whether the speech signal is a busy tone or not is determined and the indication signal of the busy tone is output if the speech signal is the busy tone. The invention also discloses a device for realizing the method at the same time. The method has the advantages of easy realization, low cost and reliable performance.

Description

technical field [0001] The invention relates to a busy tone detection technology, in particular to a busy tone detection method and device based on symbol bit frequency detection of voice signals. Background technique [0002] Busy tone detection plays a very important role in the call. For example: after the telephone call is over, if the subscriber switch does not detect the busy tone signal in time, the trunk cannot be released and the trunk resources cannot be fully utilized. , the phone line will be busy and cannot be dialed out. In addition, in the current Synchronous Digital Hierarchy (SDH, Synchronous Digital Hierarchy) transmission equipment, business phones need to be used for equipment management and maintenance. For the convenience of management, business phones are required to be able to communicate with the Public Switched Telephone Network (PSTN, Network) public network, but since the official telephone of SDH equipment adopts self-customized communication si...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M3/22
Inventor 曾伟宁
Owner ZTE CORP
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