KR940005217B1 - Method of detecting the end of incoming message - Google Patents

Abstract

The incoming message completion detecting method includes the steps of: checking the rotary direction of a motor each time a rotation detecting signal varies to a preset logic state; differently counting a motor counting value indicating the traveling distance of a tape according to the rotary direction of the motor; and confirming whether playback for an incoming message is completed by comparing the motor counting value with an initial value indicating a rewind start point of the tape. The method avoids waste of the tape.

Description

How to detect the end of incoming message in the answering machine

1 is a block diagram of a general automatic answering device for carrying out the present invention.

2 is a circuit diagram of a pulse generator installed in the deck portion 30 of FIG.

3 is a flowchart of end detection of an incoming message according to the present invention;

4 is an output waveform diagram of FIG.

5 is a diagram illustrating a delay time according to a change in a rotational direction of a motor.

6 is a view illustrating the operation of the photosensor 50 during the second.

* Explanation of symbols for main parts of the drawings

10: control unit 20: voice unit

30: deck portion 40: central processing unit

50: reflective photo sensor 52: reflector

54 light emitting unit 56 light receiving unit

58: absorbing surface 60: reflecting surface

R1-R2: Resistor LED: Light Emitting Diode

Q1: phototransistor

The present invention relates to a method for detecting the end of an incoming message (hereinafter referred to as "ICM") in an automatic answering device, and more particularly, to a method for detecting the end of playback of an ICM by software processing during ICM playback.

In general, an automatic answering device refers to a device that allows a user to automatically receive a call in the absence and record a message delivered by a telephone caller. The answering machine automatically receives the incoming call in the absence of the user and then plays the recorded content and sends it to the caller. The message sent to the caller is thus presented. "OGM").

On the other hand, when the OGM is finished sending, the caller can record his message on the tape of the answering machine. As such, the caller calls the ICM. When the user of the answering machine returns and presses a specific key on the answering machine to listen to the ICM left by the telephone caller, the answering machine plays the recorded ICM after completely rewinding the recorded tape for the first time. Done. At this time, the reproduction operation is automatically stopped when the reproduction of the ICM is completed. Accordingly, the answering machine has a function for automatically detecting the end of the ICM.

As described above, in order to detect the end of the ICM, the end of the ICM has been detected by recording the silence at the end of the corresponding ICM when recording the caller's ICM in the answering machine. . The mute is recorded in the form of a constant high frequency signal. At this time, since it is possible to distinguish the state in which the reproduction of the ICM is completed only by lengthening the recording length of the silence, a tape having a length corresponding to a recording time of about 10 seconds or more is used. In addition, the use of silence in this way is difficult to distinguish the end state of the ICM during ICM playback because the time difference between the normal fast state and the normal retardation state is usually up to 16 times. There was a problem falling.

Accordingly, an object of the present invention is to provide a method for detecting the end of an ICM, which can accurately detect the end of playback of an ICM in software without adding a separate hardware component.

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

FIG. 1 is a schematic block diagram of a general automatic response device for carrying out the present invention. The central processing unit 40 and the central processing unit 40 perform an automatic response function according to a built-in control program and data. The controller 10 controls the operation of the voice unit 20 and the deck unit 30 according to the control signal, and the ICM or OGM is recorded and reproduced on the tape through the deck unit 30 under the control of the controller 10. The voice unit 20 and the voice unit 20 controlled by the central processing unit 40 through the control unit 10 to record the voice signal input from the voice unit 20 to the tape and reproduce the voice signal recorded on the tape It consists of the deck part 30 output to the part 20.

An automatic answering device constructed as shown in FIG. 1 generally includes a pulse generator as shown in FIG. 2 in the deck section 30 to perform an auto stop function. Here, the automatic stop function refers to automatically stopping the operation of the deck unit 30 when the running of the tape to the end is completed.

FIG. 2 is a circuit diagram of an example of a general pulse generator installed in the deck unit 30 of FIG. 1, in which a resistor R1 and a light emitting diode (LED) are connected in series between a power supply terminal (+ 5V) and a ground. The resistor R2 and the phototransistor Q1 are connected in series between (+ 5V) and ground, and the output terminal VQ1 is connected to the collector terminal of the photo transistor Q1. In FIG. 2, the light emitting diode LED and the photo transistor Q1 are used as a reflective photo sensor 50, and a general reflective photo sensor as shown in FIG. 6 is used. Such a reflection type photo sensor is described in pages 94 to 99 of Hwang, Gyu-Seop, a book entitled “Sensor Use Technology” published on November 10, 1985 by the Korean Mechanics Research Institute. The pulse generator of FIG. 2 generates a rotation detection signal whose logic state changes according to the rotation of a motor (not shown) for driving the tape, and outputs the rotation detection signal to the central processing unit 40 through the output terminal VQ1.

3 is a flow chart of the end detection of the ICM according to the present invention, and the first process of checking the rotation direction of the motor whenever the rotation detection signal generated from the deck unit 30 changes to a preset logic state (3a). ), The second counter (3b, 3c) for counting the motor counter value representing the tape travel distance differently according to the motor rotation direction of the first step, and the motor count value for the second step, indicating the starting point of the rewind of the tape. Comparing with the initial value, the third process (3d, 3e) to confirm whether the reproduction of the ICM is completed.

4 is a waveform diagram of a rotation detection signal output from the pulse generator of FIG. 4A to 4A are waveform diagrams when the tape is driven by the operation of the deck portion 30, and FIG. 4B is waveform diagrams when the deck portion 30 is stopped.

5 is a diagram illustrating a delay time according to the inertia of the motor when the rotational direction of the motor is changed from the forward rotation to the reverse rotation.

6 is an exemplary view illustrating the operation of the photosensor 50 during the second diagram. In FIG. 6, the reflective topographic sensor 50 has a light emitting part 54 and a light receiving part 56 disposed on the bottom thereof so as to face the plane of the circular reflecting plate 52. The central axis 62 of the reflecting plate 52 is rotated. Is connected with a drive shaft for driving the tape. Typically, the drive shaft for driving the tape in the answering machine is connected to the rotational central axis of the motor through the belt or gear. Accordingly, the reflector 52 rotates in response to the rotation of the motor. In addition, the light emitting unit 54 of the reflective photo sensor 50 corresponds to the light emitting diode LED of FIG. 2, and the light receiving unit 56 corresponds to the photo transistor Q1. The plane of the reflecting plate 52 is divided into an absorbing surface 58 for absorbing light emitted from the light emitting unit 54 and a reflecting surface 60 for reflecting.

Hereinafter, with reference to Figures 1 to 6 attached to the operation example of the present invention will be described in detail.

First, in FIG. 2, the light emitting diodes (LEDs) emit light at all times while power is supplied to the answering machine, and the light emitted from the light emitting diodes (LED) is incident on the reflecting plate 52. In this state, when the motor is rotated to drive the tape in the deck unit 30, the reflector plate 52 also rotates. The light emitted from the light emitting diodes (LED) alternately enters the absorbing surface 58 and the reflecting surface 60 of the reflecting plate 52 as shown in FIG. 6 as the reflecting plate 52 rotates. If light emitted from the light emitting diodes (LED) is incident on the reflective surface 60, the light is reflected by the reflective surface 60 and applied to the photo transistor Q1. As a result, the photo transistor Q1 is " turned on " so that the rotation detection signal output from the output terminal VQ1 connected to the collector terminal of the photo transistor Q1 is centrally processed to a logic " low ". Applied to the device 40. On the contrary, when light emitted from the light emitting diode LED is incident on the absorption surface 58, the light is absorbed by the absorption surface 58 and thus is not applied to the photo transistor Q1. Accordingly, the phototransistor Q1 is " turned off " so that the rotation detection signal output from the output terminal VQ1 is applied to the central processing unit 40 in a logic " high ".

Therefore, the rotation detection signal is output in the form of a square wave in which the logic state changes as shown in FIG. 4A while the deck unit 30 operates and the tape is driven by the rotation of the motor. The deck unit 30 stops and the tape travels. If not, only the state of either logic " low " or logic " high " The logic "low" refers to a state in which the rotation detection signal is output at 0V and the logic "high" refers to a state in which 5V is output.

In general, the automatic answering device has performed an automatic stop function using the rotation detection signal as described above. That is, while the tape is running, the central processing unit 40 continuously scans the state of the rotation detection signal. At this time, as the tape is completed to the end, when the rotation detection signal is input in the state as shown in FIG. 4B for a predetermined time (about 1 second), the operation of the deck unit 30 is automatically stopped.

The present invention detects the end of the regeneration of the ICM by using the rotation detection signal output from the pulse generator as shown in FIG. 2 installed in the deck unit 30 for performing the automatic stop as described above. That is, the current position of the tape can be stored so that the tape can be automatically returned to the original position after the tape position change. For example, if you want to come back to the original position after rewinding 100 times from the current position, you can perform 100 turns in the fast forward state.

In the above concept, the present invention detects the end of the regeneration of the ICM by counting the number of rotations of the motor, more precisely, the number of waveform changes of the rotation detection signal generated each time the motor rotates. At this time, the count value is increased when the motor is rotated in the forward direction to rewind the tape, and the count value is decreased when the motor is rotated in the reverse direction to play the tape.

On the other hand, the period of the waveform as shown in Fig. 4a is different from the normal playback state and the fast forward state, and in particular, there is a big difference in the wound state of the tape. Therefore, the period for scanning the state of the rotation detection signal should be appropriately set. For example, if the scan is performed at a normal motor speed of about 2 ms, the change of the rotation detection signal can be accurately counted.

It is also important to consider motor inertia in how to detect the end of a message with the speed of the motor. Accordingly, in consideration of the inertia of the motor when the motor rotates in reverse, a delay time for the reverse rotation is made after the motor is completely stopped in the forward rotation state as shown in FIG. Due to the delay time, the transition time of the count state becomes A time in FIG.

The operation of the present invention as described above will be described with reference to the flowchart of FIG. First, when the user presses a specific key to play the ICM recorded in the absence, the CPU 40 replays the recorded ICM after completely rewinding the tape for the first time as described above. At this time, the central processing unit 40 controls the deck unit 30 to rewind the tape to rotate the motor in the forward direction, and to reproduce the tape to control the deck unit 30 to rotate the motor in the reverse direction.

In the above state, the central processing unit 40 changes the rotation detection signal generated as shown in FIG. 4B in the pulse generator as shown in FIG. 2 of the deck unit 30 as the motor rotates to a preset logic state. Perform step 3a). Here, the logic state is set to either logic "low" or "high". In step (3a), the rotation direction of the motor of the deck unit 30 is inspected. At this time, in the forward rotation, the motor count value is increased in step (3c), and in the reverse rotation, the motor count value is decreased in the step (3b). Thereafter, in step (3d), the motor count value is compared with the initial value indicating the start point of the rewind of the tape to check whether the ICM is completed. At this time, when the motor count value is equal to the initial value, it is detected that the regeneration of the ICM has been completed, and in step (3e), the incoming message end detection flag is set and returned. On the other hand, if the motor count value is different from the initial value, it is detected that the regeneration of the ICM is not finished and is returned as it is. Here, the incoming message end detection flag is a flag for indicating whether or not the ICM is terminated, and the central processing unit 40 checks the state of the incoming message end detection flag while playing the tape, and plays back when the incoming message end detection flag is set. To exit.

As a result, the central processing unit 40 rotates the motor in the forward direction to increase the motor count value from the initial value while rewinding the tape, and when the tape is completely rewinded, rotates the motor in the reverse direction again to decrease the motor count value while reproducing the tape. When it becomes equal to the initial value, it is detected that the reproduction of the ICM is finished.

As described above, the present invention not only prevents waste of the tape by accurately detecting the end of the ICM without additional processing such as recording a high frequency signal on the tape, but also uses an automatic stop program in common, thereby providing a central processing apparatus. The program size of the program can be reduced, so that the limited ROM area can be effectively utilized.

Claims (3)

It has a deck unit 30 for generating a rotation detection signal of which the logic state changes according to the rotation of the motor for driving the tape, and automatically records and reproduces incoming messages transmitted from the telephone caller by automatically receiving a telephone call when the user is absent. A method of detecting an end of an incoming message for detecting an end of reproduction of an incoming message in a response device, the method comprising: a first step of inspecting a rotation direction of the motor each time the rotation detection signal changes to a preset logic state; The second process of counting the motor count value representing the driving distance differently according to the motor rotation direction of the first process, and comparing the motor count value of the second process with the initial value indicating the start point of the rewind of the tape Characterized in that the third step of confirming whether or not the reproduction end for the incoming message Termination detection method of mouth messages. The method of claim 1, wherein the second process comprises increasing the motor count value when the rotational direction of the motor is a forward rotation for rewinding the tape, and wherein the rotational direction of the motor is used for normal regeneration of the tape. And a step of reducing the motor count value when the motor rotates in the reverse direction. 3. The method of claim 2, wherein the third process comprises: detecting that the reproduction of the incoming message has ended when the motor count value becomes equal to the initial value, and setting an incoming message end detection flag; And if it is different from the initial value, detecting that the regeneration of the incoming message has not been completed.

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