KR860002226Y1 - A home keyphone - Google Patents

Abstract

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Description

Ringer output stabilization circuit of home key phone

1 is a detailed circuit diagram of the present invention.

2 is a time chart at each point (A, B, C, D, E) of FIG.

The present invention relates to a ring tone output stabilization circuit of a home key phone using a plurality of extension telephones connected to one trunk line. That is, the trunk line is provided with the same electrical conditions as a normal telephone is connected, and the incoming signal amplifiers of multiple extension telephones connected to the trunk line are controlled to control the efficient incoming signal amplifier to enable efficient incoming signal amplification. This is to prevent the ringer's volume from falling below a specified value when a signal is applied to each Ringer.

In the related art, when a plurality of extension telephones are connected to one curve, load resistance is increased, so that the voltage and current applied to each ringer are reduced to reduce the volume of the ringer or the ringer does not ring at all.

The present invention will be described in detail based on the drawings shown as solving the above drawbacks as follows.

1 is a detailed circuit diagram of the present invention, the configuration of the present invention is an auxiliary ringer for preparing in case of power failure, the incoming signal detection unit (1) for correct operation according to the curved incoming signal of 20 Hz, the incoming ring sound at the input of the curved incoming signal Tone ringer circuit section 2 for generating a signal, time delay circuit 3 for continuously operating the control signal generator 4 against interruption of the incoming signal level, and operating only when an incoming signal is input from the trunk line. Accordingly, the incoming signal sound can be output by amplifying the incoming signal sound from the control signal generator 4 and the tone ringer circuit 2 generated by the control signal generator 4 to generate the frequency control signal. The ring tone output circuit 5 of the extension telephone set so that the incoming call tone is output so that the curved acquisition signal of the extension telephone can be applied to the time delay circuit 3 Consists of a curve in the firearm capturing signal generating unit (6). When the incoming signal is input from the curve (Tip, Ring), the DC component is shielded from the capacitor C1, and only the AC component is passed through the resistor R1 to the transformer T1. In this case, the incoming signal induced in the secondary coil of the transformer T1 is rectified and smoothed by the incoming signal detection unit 1, and is detected and transmitted to the toneringer circuit unit 2. The tone ringer circuit portion 2 causes the incoming call sound to be sent to the ring tone output circuit of the extension telephone 5 by the detected incoming signal.

Further, the control signal generator 4 connected to the time delay circuit 3 is connected to the connection point X between the incoming signal detection unit 1 and the tone ringer circuit unit 2 to continuously control the incoming signal level. When the incoming call signal is applied to the ring tone output circuit 5 of the extension telephone and the incoming call tone (ring tone) is output, the station subscriber hears the handset. At this time, the hook switch SW.2 of the curve acquisition signal generator 6 of the extension telephone is turned on to operate the control signal signal oscillation circuit for curve acquisition so that the oscillation signal is applied to the frequency discrimination circuit so that the time delay circuit ( Since the low signal is input to the transistor Q2 base of 3), the transistor Q2 is turned on and the charging voltage of the capacitor C4 is discharged momentarily through the collector of the transistor Q2, so the output of the inverter gate G2 is output. Becomes a high signal and transistor Q3 is turned off, so the control signal oscillator circuit stops operating. As a result, the control signal generator 4 does not generate the frequency control signal fa so that the incoming call tone generated by the tone ringer circuit 2 is not heard by the called subscriber. In other words, the control signal generator 4 operates only when an incoming signal is input from the curve, and accordingly, a frequency control signal fa is generated to generate the beep amplifier A1 of the ring tone output circuit 5 of the extension telephone. When the curve capture signal and the incoming signal are not input, the frequency control signal fa is not generated, so that a circuit is configured so that the beep amplifier A1 of the extension telephone does not operate, thereby delivering an efficient incoming signal. When incoming calls are input from the tip and ring of the CO line, it is applied to the primary coil of the transformer T1 through the resistor R1 connected in series with the capacitor C1 and guided to the secondary coil. do. This induced AC signal is rectified by the rectifying diode D1 and smoothed by the resistor R2 and the capacitor C2. The waveform at point A is as shown in FIG. The smoothed AC signal is applied to the base of the transistor Q1 via the resistor R3, where the collector power supply of the transistor Q1 is supplied with the + V power supply of the tone ringer circuit having the resistance component.

At this time, the transistor Q1 is turned on so that the point B potential of the collector of the transistor Q1 goes from high to low. The normal tone ringer circuit is driven only when the potential at the point B is low, and the incoming ring tone is sent to the ring tone output circuit 5 of the extension telephone via the coupling capacitor C3. In this case, the incoming call tone is sent to the ring tone output circuit 5 of the extension telephone. In this case, the incoming signal tone is transmitted from the ringer speaker SPK1 of the ringer tone output circuit 5 of the extension telephone as follows.

That is, the ring tone is controlled by the beep amplifier A1 of the ring tone output circuit 5 of the extension telephone according to the hooks, on and off of each extension telephone, and the control of the beep amplifier A1 is controlled by the operation of the control signal oscillation circuit. The frequency control signal fa oscillates in accordance with the control. The control signal allows the incoming call sound to be continuously transmitted to the ringer speaker SPK1 while the beep amplifier A1 of the ring tone output circuit 5 of the extension telephone is turned on. Therefore, the frequency control signal fa delays the signal in the intermittent state (high for 1 second and low for 2 seconds) so that the beep amplifier A1 of the ring tone output circuit 5 of the extension telephone is kept on. The circuit section 3 is used to operate as follows. When the transistor Q1 is turned on by the curved incoming signal, the potential at the point B is input to the inverter gate G1 through the resistor R4, and the output is inverted like the potential at the point C in FIG. Through D2), the resistor R5 and the capacitor C4 smooth the same as the potential at the point D in FIG. In addition, the charging voltage of the capacitor C4 is discharged through the resistor R5 and the inverter gate G2. During this discharge time, the output of the inverter gate G2 is inverted to low as the potential at the point E in FIG. 2 and is applied to the base of the transistor Q3 via the resistor R7. At this time, the transistor Q3 is turned on so that a normal control signal generation circuit is driven so that the frequency control signal fa is input through the coupling capacitor C5 through the condenser C6 of the ring tone output circuit 5 of the extension telephone. In this case, the output fa of the frequency discriminating circuit V becomes a high signal and turns on the transistor Q4, thereby driving the beep amplifier A1.

In this case, the incoming signal sound input to the amplifier through the condenser C7 and the choke coil L1 is amplified by the amplifier A1 so as to ring the ringer speaker SPK1. If the extension subscriber picks up the telephone handset, the trunk line acquisition signal is sent from the trunk line acquisition signal generator 6 of the extension telephone and a low signal is input to the transistor Q2. Therefore, transistor Q2 is turned on so that the charging voltage of capacitor C4 discharges momentarily through transistor Q2, so that the output of inverter gate G2 is the potential indicated by the dotted line at point E shown in FIG. Since the transistor Q3 is turned off by inverting the low signal to high, the control signal generation circuit is stopped.

As described above, the present invention gives the same electrical conditions as a single telephone ringer for a curve, so that even when a plurality of extension telephones are connected, each ringer speaker SPK1 can emit a ringing tone at a predetermined value at the same time. There is this.

Claims (3)

As shown in the drawing, a time delay circuit unit is connected between a ringer circuit unit 2 connected between an incoming signal detection unit 1 connected to the secondary coil of the transformer T1 and a ring tone output circuit 5 of an extension telephone. (3) A ring tone output stabilization circuit for a home key phone, characterized in that the control signal generator (4) is connected in parallel. The scope of claim 1 is to connect a resistor (R4) inverter gate (G1) and a diode (D2) to the contact (X) of the collector terminal of the transistor (Q1) of the incoming signal detector (1). A time delay circuit section configured by connecting an inverter gate (G2), a resistor (R5), a capacitor (C4), a transistor (Q2), and a resistor (R6) to an output terminal of the (D2). The scope of claim 1 includes: an extension configured by interconnecting capacitors C and C7 choke coil L1, beep amplifier A1, transistor Q4, frequency discrimination circuit, and ringer speaker SPK1. Ring tone output circuit of telephone.