KR940003508B1 - Telephone circuit - Google Patents

Abstract

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Description

Automatic signal path and call path recovery method and device

1 is a schematic block diagram of a telephone incorporating a device according to the present invention, which is capable of ringing in the case of an off-hook, in which the handset is misplaced.

FIG. 2 is a detailed circuit diagram of the receiver receiver sound detection unit shown in FIG.

* Explanation of symbols for main parts of the drawings

2: hook switch 3: speaker

4: Dial part 5: Call part

100: hook switch automatic recovery unit 101: relay switch

102: relay coil 200: leaving sound detection unit

210,220,230,240: Detector 260: Flip-flop

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention generally relates to driving a ringer of a telephone, and more particularly, to a signal path and a method for automatically recovering a telephone call path and a device for enabling a telephone call to be made even after a call is put off incorrectly. will be.

In general, the telephone is configured to receive a ring tone from the other party when the hook switch is turned on (ON HOOK), and to make a call or make a call when the hook switch is turned off (OFF HOOK). I can do it.

However, if the handset is left unattended after a call, before a call, or a child's mischief, the hook switch is turned off, so when an outsider dials a phone number, the hook switch is recognized as a busy state. There was a fault that could not be counted.

Therefore, the present invention has been invented in view of such circumstances, and when the handset is left unattended, the telephone station switches automatically and detects the handset left sound that alerts the user of the state of the handset. It is an object of the present invention to provide a signal path and a method for automatically recovering a call path of a telephone to receive a call from a counterpart, even at the time of OFF HOOK.

According to an embodiment of the present invention for achieving the above object, a method is provided so that a telephone call can be received from the outside when the receiver is left inadvertently, which is output from the telephone station when the telephone receiver is left unattended. Detect and convert a complex frequency signal for an idle alarm into a voltage signal; Logically combine the plurality of detected voltage signals; Even if the hook switch is turned off using the combined signal, the call circuit is cut off, and the bell circuit is driven to receive an incoming call from the outside.

Further, according to another embodiment of the present invention, a hook switch which is turned off during a telephone call and turned on during a non-call, a speaker for generating a ring tone during a non-call and a dial part and a counterpart for dialing the other party during a telephone call A signal path and a call path automatic recovery device of a telephone having a call unit for making a call with the call unit, which is output from the telephone station when the hook switch is turned off due to an improper lefting of the handset before or after a call. A plurality of detectors for detecting an idle sound signal and converting the signal into a voltage signal, and a logical combination of the voltage signals detected by the respective detectors, and outputting a high state signal when the detector is output. If the output of the ORA gate is high, it outputs a high state signal, but the hook switch is turned on or the An idle sound detection unit comprising a flip-flop for outputting a low signal when the output of the drive is low; If the hook switch is turned off due to the telephone receiver being incorrectly left after the call or before the call, the signal output from the idle sound detection unit is input to put the speaker into a standby state, and the operation of the dial unit and the call unit is blocked. In order to be configured to the hook switch automatic recovery unit provided between the hook switch and the standstill sound detection unit.

According to the present invention, it is preferable that each of the detectors respectively detects 1400 Hz, 2600 Hz, 2450 Hz and 2600 Hz signals output from the telephone station when the receiver is out of position and converts them into voltage signals, respectively.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic block diagram of a telephone having a signal path and a call path automatic recovery device according to the present invention. First, a signal input through a telephone line (TIP, RING) is rectified by the bridge circuit (1). It is via the hook switch 2 which is turned off at the time of telephone call and on at the time of non-telephone. Here, the hook switch 2 is located at the a-contact when the user picks up the handset (not shown) of the telephone, and is placed at the b-contact (on-hook) when the handset is placed on the telephone. When the hook switch 2 is located at the b-contact point, the call ringer outputs a ringing tone from the outside through the speaker 3 when the call switch is in a non-call state, and when the hook switch 2 is located at the a-contact point, the user calls the other party. In this case, the dial unit 4 and the call unit 5 are operated.

The common terminal C of the relay switch 101 constituting the hook switch automatic recovery unit 100 is connected to the a-contact point of the hook switch 2, where the relay switch 101 is in a call. -When the handset is placed at the contact point and the hook switch 2 is maintained at the a-contact point after the telephone is inadvertently left unattended, the signal generated by the stand-alone sound detection unit 200 is inputted when the receiver is left unattended. Transistor 103 operates and is therefore located at the b-contact by the electromagnetic force of relay coil 102. Therefore, even if the hook switch 2 is positioned at the a-contact due to the neglect of the handset, the relay switch 101 is connected to the b-contact by the holding force of the relay coil 102 operated by the neglect sound detecting unit 200. Since the speaker 3 is placed in an external telephone standby state, the operation of the dial unit 4 and the communication unit 5 is stopped. In other words, even if the telephone receiver is dialed by a specific person from the outside even if the telephone is placed incorrectly, the telephone shown in FIG. 1 is not in a call so that the speaker 3 can ring.

FIG. 2 is a detailed circuit diagram of the handset neglect sound detection unit 200 shown in FIG. 1, and the neglect sound detector 200 is a complex handset neglected sound transmitted from a telephone station when a user incorrectly leaves the handset. And detectors 210, 220, 230 and 240 for detecting signals 1400 Hz, 2060 Hz, 2450 Hz and 2600 Hz to generate voltage signals V1 to V4. Here, the idle sound signals (1400 Hz, 2060 Hz, 2450 Hz, and 2600 Hz) are output in parallel from the telephone company.

However, the detector 210 includes a phase detector 211 that detects a frequency signal of 1400 Hz among the complex soundproof signals, a low pass filter 212 and a filtered voltage signal that generate the voltage signal V1 by filtering the detected signal. And a voltage controlled oscillator 213 for providing a control voltage to the phase detector 211. In addition, the phase detector 221 detects a signal of 2060 Hz in the idle sound signal and provides it to the low pass filter 222, and the voltage controlled oscillator 223 provides a control voltage to the phase detector 221, and thus, a detector ( 220 generates a voltage V2. The phase detector 231 of the detector 230 detects a signal of 2450 Hz from the composite signal and provides the signal to the low pass filter 232, and the voltage controlled oscillator 233 controls the phase detector 231. At 232, the voltage signal V3 is output. Similarly, the detector 240 also includes a phase detector 241 at 2600 Hz, a low pass filter 242, and a voltage controlled oscillator 243 to output the voltage signal V4. The voltage signals V1, V2, V3, and V4 output from the detectors 210, 220, 230, and 240 are provided to the oragate 250. In this case, the oragate 250 is the voltage signal V1, When V2, V3, or V4) is generated, the high state signal is provided to the preset terminal PR of the flip-flop 260. Then, a high state signal is output from the output terminal Q of the flip-flop 260 to drive the transistor 103 shown in FIG. 1 to flow a current through the relay coil 102 so that the relay switch 101 is turned on. It is to be located at the b-contact, which will be described in more detail.

First, when the user picks up the handset to make a call, the hook switch 2 (see Figs. 1 and 2) is positioned at the a-contact. In Fig. 2, the flip-flop 260 is connected to its output terminal ( Output the low signal through Q). Thus, the transistor 103 remains off so that the relay switch 101 of FIG. 1 is located at the a-contact and the dial part 4 and the call part 5 are enabled so that the user can talk to the other party. do.

After the user completes the call, the handset is correctly placed on the base of the phone, and the hook switch 2 is placed at the b-contact to be in a call waiting state. When a call is received from the outside, the ring tone is a speaker (or buzzer) (3). Ring), and the hook switch 2 is placed at the a-contact to allow the user to make a call as described above.

However, if the handset is not correctly placed on the telephone base after the call or before the call, the hook switch 2 is still positioned at the a-contact. However, after a predetermined time elapses after a call with the other party or after hearing the handset, the telephone station exchanger outputs a handset neglect sound and inputs it to the telephone shown in Fig. 1. This happens when the handset is not placed on the phone body exactly as in.

The receiver is a combination of 1400 Hz, 2060 Hz, 2450 Hz and 2600 Hz signals, which are input in parallel rather than in series. The input of the composite handset neglected sound is applied to the neglected sound detection unit 200 via the a-contact of the hook switch 2 and the a-contact of the relay switch 101. At this time, the neglect sound detection unit 200 is configured as shown in Figure 2, each detector (210, 220, 230, 240) by detecting the complex sound signal (1400Hz, 2060Hz, 2450Hz, 2600Hz) voltage The signals V1, V2, V3, and V4 are output.

The voltage signals V1, V2, V3, and V4 generated in this way are applied to the oragate 250. In this case, the oragate 260 emits a high state signal to operate the flip-flop 260. Flip-flop 260 then applies its output terminal Q to the base of transistor 103 by making it high. At this time, transistor 103 is turned on, so that current flows through relay coil 102 so that relay switch 101 is located at the b-contact. When the relay switch 101 is located at the b-contact point, even if the hook switch 2 is located at the a-contact point, the operation of the dial part 4 and the call part 5 is stopped, and the speaker 3 waits for a call. In this state, when a call is received from the outside, the call is in a waiting state. When the call is received from the outside, a ring tone is heard from the speaker 3. Then, when the user puts the handset on the telephone body, the hook switch 2 shown in FIG. 2 is located at the b-contact so that the output Q of the flip-flop 260 has a low state and the relay switch 101 is used. Is again located at the a-contact.

The present invention operates as described above, when the handset is not correctly placed on the body of the phone after completion of a call with the outside, or when the handset is not correctly placed before the call due to mischief of a child or the like, a separate handset is detected by the telephone station. Instead of automatically shutting off the power of the dial part and the call part, the relay automatically operates the ring part so that a telephone call can be made from the outside even if the handset is misplaced.

Although the present invention has been described with reference to the accompanying drawings, the present invention is not limited thereto, and many modifications and variations may be made.

For example, the device according to the invention may be installed outside the phone instead of inside the phone.

Claims (3)

A method for receiving an incoming call from an external telephone when the telephone receiver is inadvertently neglected, the method comprising: detecting and converting a complex frequency signal for the telephone receiver warning from the telephone station when the telephone receiver is left unattended; Logically combine the detected plurality of voltage signals; The signal path and call path automatic recovery method of the telephone, characterized in that by using the combined signal, even if the hook switch is off, the call circuit is cut off and the bell circuit is driven to receive an incoming call from the outside. Hook switch 2, which is turned off when talking on the phone, and turned on when not talking, speaker 3 which generates a ring tone when not talking, dial 4 and other party for dialing the other party on the phone A signal path and a call path automatic recovery device of a telephone having a call unit (5) for generating a ton signal for making a call with a telephone; When the hook switch is turned off because the receiver is incorrectly left before or after a call, a plurality of detectors 210, 220, 230, and 240 detect a mixed handset sound signal output from the telephone station and convert them into voltage signals. Ora logical combination of the voltage signals detected by each of the detectors 210, 220, 230, and 240, and outputting a low state signal when there is an output of the detectors 210, 220, 230, and 240. When the output of the 250 and the oragate 250 is high, a signal in a high state is output, and even if a hook switch is turned on or the output of the oragate 250 is restored from a low state to a high state, An anti-noise sound detection unit 200 comprising a flip-flop 260 for outputting a signal; When the hook switch is turned off because the handset is incorrectly left after the call or before the call, the signal output from the idle sound detection unit 200 is input to put the speaker 3 into an operating standby state, and the dial unit 4 and the hook switch automatic recovery unit 100 is provided between the hook switch 2 and the stand-alone sound detection unit 200 to block the operation of the call unit 5, characterized in that Signal path and call path automatic recovery device. The apparatus of claim 2, wherein each of the detectors 210, 220, 230, and 240 detects 1400 Hz, 2060 Hz, 2450 Hz, and 2600 Hz signals output from the telephone station when the receiver is out of position. 241, a low pass filter 212, 222, 232, 242 for converting the phase sensed signal to a predetermined voltage, and the phase detectors 211, 221, 231, 241 by the low pass filtered voltage signal. The signal path and call path automatic recovery device of the telephone, characterized in that each of the configuration consisting of a voltage controlled oscillator (213, 223, 233, 243) for providing a control voltage.