KR970078387A - And apparatus and method for detecting a tone in a communication terminal - Google Patents

Abstract

1. Technical field to which the invention described in the claims belongs

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2. Technical Challenges to be Solved by the Invention

When a state in which the handset provided in the parallel connection telephone is misplaced or the hook-switch is not hooked-on is maintained for a predetermined time despite the transmission / reception of a document using the facsimile system or telephone or the termination of the call, A rejection tone is input and a handwriting sound is generated by the handset. At this time, if the user is absent or the surrounding area is loud and the action is impossible, the facsimile system or the telephone can not perform the normal function, so that the user can not receive the fax message or receive the incoming telephone call.

3. Invention is the point of solution

A ring generator for generating a ring signal according to a switching control signal, or a switch for connecting the call circuit of the parallel-connected telephone to a public telephone network, a tone detection sensor for detecting a recognition tone received from the public switching center, And a control unit for generating a switching control signal for switching the switch to the ring generation unit when a recognition tone is detected by the ring detection unit. When a recognition tone received from the public switching center is detected by the tone detection sensor, And a line blocking device for detecting a recognition tone in a communication terminal connected to the generation part.

4. Important Uses of the Invention

Communication terminal.

Description

And apparatus for detecting a line in a communication terminal

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FIG. 2 is a specific circuit diagram of a facsimile system according to the present invention; FIG.

Claims (3)

A facsimile system having a parallel connection telephone, comprising: a ring generator for generating a ring signal in response to a switching control signal; a switch for connecting the call circuit of the parallel connection telephone to a public telephone network; And a control unit for generating a switch control signal for switching the switch to the ring generation unit when a recognition tone is detected by the tone detection sensor. A telephone terminal apparatus comprising: a tone detecting unit for detecting a recognition tone received from a public switching center; and a control unit for performing a self-control, wherein when a recognition tone received from the public switching center in the hook- And connecting the public telephone network to the ring generating unit. A method for blocking a line when a recognition tone is detected in a facsimile system having a switch operating in accordance with a switching control signal and a tone detection sensor for detecting a recognition tone, the method comprising the steps of: And a switching step of providing a switch control signal for connecting the public telephone network to the ring generator when the recognition tone is detected. ※ Note: It is disclosed by the contents of the first application.