JPS5852384B2 - answering machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an answering machine, and more particularly, the present invention relates to an answering machine, and in particular, it is a portable answering machine by changing the configuration of Japanese Patent Application Laid-Open No. 49-13174 (Japanese Patent Publication No. 53-5167) previously filed by the same person. The present invention relates to an answering machine that has been improved to be more compact.

That is, an object of the present invention is to provide an answering machine whose structure is extremely simplified by providing a means for generating a specific signal tone in place of the answering tape in the conventional answering machine.

Next, the specific structure of an embodiment of the present invention will be explained.

In the figure, L2 is a telephone line, R1 to R27 are resistors, C7 to C22 are capacitors, and Q1 to Q7 are transistors, among which Q3 is an FET transistor.

Next, LT is a line transformer that also serves as an oscillation transformer, PR indicates its primary coil, SE its secondary coil, and TH its tertiary coil.

BATI, and 2 are power supplies, 51-1. S 1-2 , s
All i-3 are slide switches or rotary switches having two interlocking contacts, and in the figure, the middle is the off position, the upper part is the absent position, and the lower part is the mutual recording position.

Also, D1 to D6 are variable resistors, VR-1, and VR-2 are variable resistors.

Next, Y indicates a relay, whose contacts are 7-1 V -25
The contact point is shown in the figure as a white circle in a broken state.

Further, TS is a push button switch, which is used for testing when the main body is in the automatic position.

Note that PL is a pilot lamp inserted in series with relay Y, which lights up when relay Y operates to indicate that the telephone line is in a closed state when viewed from the outside, and to minimize the holding current of relay Y. belongs to.

Next, the main body can be roughly divided into parts A, B, C, D, E, and G, which are surrounded by dotted lines in the figure.

That is, A is the transistor Q1. Q2, consisting of relay Y, etc., which activates relay Y in response to incoming telephone calls and forms a closed circuit, and B is the FET transistor Q.
This is a timer circuit consisting of 3 etc., which self-maintains after the relay Y is activated by an incoming telephone call, and also for a predetermined time, that is, approximately 6
This circuit releases the self-holding circuit when 0 seconds have elapsed, and also releases the telephone closing circuit to restore the entire device to a standby state.

Next, C is a well-known oscillation circuit consisting of a transistor Q7 and a transformer LT, which oscillates at approximately 1400 cycles of a single tone when Q7 is in operation, and sends this out to the telephone line via the primary side of the line transformer. I am now able to do this.

However, as is clear from the diagram, the emitter circuit has a resistor R12.
A capacitor C1l is coupled through the transistor Q7, and unless the intermediate point g is grounded as described later, the transistor Q7 does not operate and does not generate oscillation.

Next, D is an astable multivibrator consisting of transistors Q4 and Q5, and when the operation switch on the main body is in the absent position, relay Y is activated and contact y-
When energized by 2, it oscillates at intervals of 0.2 seconds for the first 3 seconds, but then turns on transistor Q4 once every 7 seconds (for a short period of time (about 0.2 seconds),
This is a circuit for controlling the oscillation circuit C mentioned above.

Next, E is a time constant control circuit for astable multi-D, which also includes transistor Q6.

Its action is Q as soon as relay contact y-s becomes make.
6 is turned on, and in order to conduct between its emitter and collector, the resistor R0 inserted in parallel between them is disabled.
Only a small resistance R2□ is applied to the base of the transistor Q4, and then about 3 seconds later, when the capacitor C0 is charged, the transistor Q6 is turned off, so that from then on, the b, z, and K of the transistor Q4 are A high resistance of 1 Mg is configured to be coupled in series with R22.

As a result, the collector of transistor Q4, that is, the point f, is in an intermittent on/off state at intervals of about 0.2 seconds during the 3 seconds when the current is applied, but after about 3 seconds, the point f changes to that shown in FIG. As shown, the operating state is OFF for about 7 seconds and ON for 0.2 seconds.

Next, F is a circuit for controlling an external recorder, and the inner terminal m1. m2 is the contact y- of the relay A
4 is connected to control the motor circuit of the external recorder, and terminals nl and n2 are connected to the external recorder G section to receive the customer's voice input from the telephone line via a network branched from the primary side of the line transformer. It is now being introduced.

Next, we will discuss its effect.

As mentioned above, when a 16-cycle signal comes from Ll > L2, the signal that comes in via the break contact of contact y-□ of relay Y, capacitor C3, and resistor R0 is transferred to diode D1. It is rectified by D2, passes through variable resistor VR1,
Charge is accumulated in C5, and when the voltage reaches a certain level, a positive voltage is applied to the base of transistor Q1 through diode D3, turning it on.

When transistor Q1 is turned on, a voltage drop occurs in its emitter circuit R4, which applies voltage to the base of transistor Q2, turning it on, thereby turning on relay Y.

When relay Y is turned on, pilot lamp PL lights up, and its contacts y-1, V-2, y-s, and y-4 are all made.

Therefore, by y-1, telephone line L1. L2 constitutes a closed circuit via the primary side PR of the line trust LT.

Further, the source voltage of the FET transistor Q3 is applied through the contact y-2.

At this time, voltage is also applied to the gate of the capacitor C6, so it is turned on, but after that, the capacitor C6 is gradually charged by the high resistance 0VR2.

At the end of the charging period, L.Run Sister Q3
is turned off.

In this embodiment, the time constant is set so that the time between them is about 60 seconds.

Note that when the relay contact 3'-2 is in a broken state, it short-circuits the capacitor C6 and completes its discharge, so the time constant after the contact y-2 becomes made is always constant.

Now, as mentioned above, relay contact 3'-2 is turned on and transistor Q3 is turned on, so that a positive voltage is applied from its drain side to the base of transistor Q1 via resistor R2 (approximately 33cm, Q). As a result, the transistor Q□ is held in the on state, thus forming a self-holding circuit for the relay Y.

In this manner, when relay Y is held for a certain period of time and the closed circuit is continued, transistor Q4. Q5. Q6. Q
7 will be supplied with current.

Therefore, each transistor of the oscillator circuit C, the astable multivibrator circuit D, and its time constant control circuit E is all activated. Among these, the oscillation circuit Q7 has its emitter circuit connected to the resistor R12.
It is grounded through the capacitor C1□, and will not oscillate unless point g in the figure is grounded.

Also transistor Q4. The Astenor multivibrator consisting of Q5 starts its operation at the same time as it is energized, but when looking at this with the valve operating point f as a reference, this point f repeats on and off.

However, the repetition period is capacitor C7, resistor R8,
It is determined by the time constant consisting of capacitor C8 and resistor R22, among which capacitor C7 and resistor R8
The time constant determined by is the time for point f to turn on, and this time constant does not fluctuate during operation of the device and is set to approximately 0.2 seconds.

However, as mentioned above, the time constant circuit consisting of the capacitor C8 and the resistor R22 is controlled by the time constant control circuit E so that the resistor R22 supplies a positive voltage to the base of the transistor Q4 for about 3 seconds after energization, that is, until the transistor Q6 is turned off. When transistor Q6 turns off after 3 seconds, resistor R22 plus resistor R9, that is, about L
The high resistance of M and Q will lead to this.

Therefore, in the case of only resistor R22, this point f will turn on and off rapidly at intervals of about 2 tenths of a second, but after 3 seconds it will turn on for about 7 seconds as shown at the mouth in Figure 2. The state of being off for seconds will be repeated.

Therefore, the aforementioned operating point f and the point g of the emitter circuit of the transistor Q7 are coupled through the diode D6, but when the transistor Q4 is turned on as described above, the point f is grounded. When this is turned off, a positive voltage will be applied to point f.

Therefore, when the transistor Q4 is turned on, the diode D6 is in the forward direction, so the charge accumulated in the capacitor C11 is rapidly discharged, and since the point g is grounded, the oscillation circuit is activated and becomes operational. The oscillation output will be sent to the telephone line.

However, when transistor Q4 is turned off, the diode is in the opposite direction, so point g is not grounded and the oscillation circuit does not operate.

Therefore, for about 3 seconds after the power is turned on, an intermittent oscillating sound at intervals of about 0.2 seconds will be heard on the telephone line, and after that, it will be oscillated once every about 7 seconds.
．． A two second oscillatory tone will be sent to the telephone line, which will be used as a beeptone to prompt the customer to record and to indicate that recording is continuing.

In this device, the capacitor C1l in the emitter circuit of the transistor Q7 is repeatedly charged and discharged via the diode D6 in the process of turning on and off the transistor Q4, but the capacitor C1 and the resistor R
In the absence of a time constant circuit consisting of 1□, the sine wave oscillation output generated from a simple oscillation circuit becomes a sine wave that is swept and distorted by the above time constant circuit, and this is caused by f of transistor Q4. It is adjusted to combine with the rapid intermittent oscillations that occur during the first three seconds to produce a pleasant sound similar to the sound of chirping birds.

Therefore, people in countries accustomed to using such devices,
Even if it is your first experience calling this device, the first 3
First of all, you can listen carefully to the fact that the oscillation sound per second is a special and unique oscillation sound, so you can clearly distinguish it from the warning sounds etc. that tend to be generated by telephone stations.

The subsequent beep tones indicate that the device is in a recording state, and it is time to speak.

Then, the signal is transmitted through a network separated from the primary coil of the line transformer LT, namely resistor R26, capacitor C20, resistor R14°R15, and capacitor C.
In the network consisting of 2□, the cord n1. which comes out from both ends of the resistor R1. Through R2, the voice is introduced into the microphone terminal of the external recorder, that is, the amplifier AMP of the G section of the external recorder, and the voice is recorded on tape.

At that time, contact y-4 of relay Y is on, and when the aforementioned operation switch 51-3 is in the absent position, remote terminals m, , R2 are short-circuited by contact 'l-4. This will drive the tape drive motor M inside the external recorder as shown in the figure.
It is already well known that each terminal of the l2R2rml2m2 is equivalent to a microphone socket in a normal cassette tape recorder, and that the motor M is controlled by a switch installed in the microphone.

In developed countries, the beep tone frequency is set to approximately once every 15 seconds.

However, if this device is used when you are away from home, there is a risk of making the other party feel uneasy, so in this embodiment, the message is sent once every seven seconds.

However, in reality, it is easy to send the signal once every 15 seconds, and in that case, by setting the switch 51-2 to the mutual position, the resistor R9 and the resistor R24 are connected in series.
A resistor of approximately 2M and 17 resistors will be connected between the base of transistor Q4 and the current, and the above-mentioned ON/OFF operating point f will be applied.
In the off state, the off period is approximately twice as long as about 7 seconds.

Therefore, a beep tone can be sent out approximately once every 15 seconds.

As described above, the caller records the message, but as described above, the timer circuit of transistor Q3 finally turns off transistor Q3 as time passes and the charging of capacitor C6 progresses. shall be.

Therefore, the circuit that had been maintaining transistor Q1 in the operating state via resistor R2 is cut out, and transistor Q2 is no longer able to hold relay Y, so relay Y is restored and its contacts are When everything is restored, the device returns to its original standby state and waits for new calls.

If there is an incoming call next time, the same operation as described above is repeated.

The above is an automatic operation when the user is away, but if the operation switch is set to the "mutual" position, the following can be done.

That is, the incoming circuit of A and the operation circuit of relay Y are turned off by switch 51-1, the timer circuit of B is also no longer energized, and only the Astenor multivibrator of C, the oscillation circuit of D, and the control circuit of E are in operation. It can become.

At this time, the switch 5l-2 forms a series circuit of the resistor R0 and the resistor R24 as described above.

Moreover, the remote terminal ml of the external recorder is connected by the switch 51-3.

m2 is in an on state regardless of relay contact 'l-4.

Therefore, in the astable multibiflator, the transistor Q6 of the control circuit E cannot be turned on, so high resistances R0 and R24 are connected to the base of the transistor Q4 and the power supply side from the beginning, and the oscillation state is 0.2 off for 15 seconds. It repeats the on state for about 0.2 seconds every 15 seconds from the beginning without generating a response signal sound, such as the chirping of a small bird for the first 3 seconds when you are away.
A beep tone will be generated for about a second.

When the second operation switch S1 is turned off, the switch 51-1 stops supplying current to all circuits, so the switches Sl-, l simply turn on the remote terminals m, m2, and the telephone line. The signal coming in from the capacitor C1 is sent to the capacitor C2□,
The terminal n1. It is possible to introduce the voice from the n2 to the microphone terminal of the external recorder, and the voice of the other party coming into the external recorder from the telephone can be input to the external recorder without using the battery power source Bat-'l.
You can also record your own voice.

In this case, since the external recorder normally uses a cassette tape recorder, it can be operated arbitrarily using its built-in power supply Bat-2.

As described above, the present invention is useful for extremely simplifying the structure of an answering machine, but the present invention is not limited to answering machines (i.e., the structure of the answering machine is not limited to answering machines, etc.). It is widely used to configure a connection circuit and use a signal source other than the response tape to notify the other party that the device has entered the connection state when both parties start talking. Moreover, since the time for configuring the closed circuit and the time for transmitting the audio frequency signal can be adjusted, the device can be adjusted according to the country where the device of the present invention is installed and the intended use of the user. The above-mentioned closing circuit configuration time and audio frequency signal transmission time can be set.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of the present invention. In Fig. 2, A is the first voltage waveform at point f in the middle part of Fig. 1. The mouth is the voltage waveform about 3 seconds after the same point.

Claims (1)

[Claims] 1. A closing circuit that closes a telephone line in response to an incoming telephone signal, an oscillating circuit that generates a pulse at a constant period after closing, a means for configuring a specific audible frequency sound using the oscillating circuit, and 1. An answering machine characterized by having a control means for changing the cycle of generating an audible frequency sound over time, and a recording means that is activated after the telephone is closed.