JP3094337B2 - Communication terminal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication terminal device for sharing a facsimile and a telephone, and to the selection thereof.

[0002]

2. Description of the Related Art At present, there is a communication terminal device in which one telephone line shares a telephone and a facsimile machine in order to save the number of telephone lines. FIG. 3 shows the basic configuration of this device. This device comprises a CPU 10, a modem processor 12, an analog front end 14, an NCU (NETWORK-CONTROL-UNI
T) 16 and a voice ROM 18. NCU 16
This is the interface with the telephone line. Voice ROM
18 stores a voice response message as shown in FIG.

[0003] First, when there is an incoming call from the other party, the CPU 1
0 reads the voice response message of FIG. 4 from the voice ROM 18 and sends it to the other party via the telephone line via the modem processor 12, the analog front end 14, and the NCU 16. Upon receiving the voice response message, the other party presses a fax transmission start button when, for example, facsimile is desired. As a result, a CNG signal (communication procedure signal) indicating facsimile is transmitted. The frequency of the CNG signal is 1100 Hz in this example.

This signal is input to the modem processor 12 via the NCU 16 and the analog front end 14. Then, the CNG signal is detected by the modem processor 12. The CPU 10 receives this CNG detection signal within a predetermined period and sends a facsimile switching signal to the NCU 16. As a result, the NCU 16 enters the facsimile reception mode. Thereafter, facsimile transmission is performed. When a telephone call is desired, the CPU 10 sends a telephone switching signal to the NCU 16 because there is no CNG signal within a predetermined time. The NCU 16 enters the telephone reception mode and calls the telephone.

Conventionally, with such a communication terminal device,
The telephone and facsimile machine were shared.

[0006]

However, the conventional communication terminal apparatus has the following problems.

[0007] As described above, the CNG signal selected by the voice response message is received, and the facsimile transmission is performed. At this time, the CNG signal was not accepted until after the voice response message was completed. If the CNG signal is received even during the voice response message, the facsimile can be transmitted quickly, but this is because of the following problems.

That is, if the signal of the voice response message includes the same frequency component of 1100 Hz as the CNG signal, the signal is transmitted from the modem processor 12 to the CPU 10.
, There is a case where it is erroneously recognized as a CNG signal. In this case, the facsimile is selected even though the user desires a telephone call. For this reason, complicated control was required so that the choice between the telephone and the facsimile was not mistaken, or it was necessary to perform detection using an external analog filter, but sufficient effects could not be obtained even with this. .

The present invention solves the above-mentioned problem, and provides a communication terminal device which prevents erroneous connection to a facsimile without erroneously detecting a specific frequency component of a voice signal as a tone signal such as CNG. The purpose is to:

[0010]

SUMMARY OF THE INVENTION A communication terminal device according to the present invention shares a telephone and a facsimile machine with one telephone line, and sends a voice response message to the other party when an incoming call is received.
In a communication terminal device that selects a telephone or facsimile in response to a communication procedure signal of the other party or a tone signal of the exchange corresponding thereto, frequency components of the communication procedure signal or the tone signal of the exchange must be removed from the voice response message in advance. It is characterized by. A communication terminal device according to the present invention is a communication terminal device for sharing a telephone and a facsimile machine with one telephone line, wherein a storage means for storing a voice response message from which a frequency component of a communication means signal has been removed in advance, Control means for transmitting the voice response message to the other party and receiving a communication procedure signal of the other party in response to the voice response message and selecting telephone or facsimile. Further, the communication terminal device according to the present invention , in a communication terminal device that shares a telephone and a facsimile machine with one telephone line, storing means for storing a voice response message from which the frequency component of the signal of the exchange has been removed in advance, Control means is provided for sending the response message to the other party at the time of an incoming call, receiving a tone signal of the exchange according to the response message, disconnecting the telephone line, and setting a standby state.

[0011]

According to the communication terminal apparatus of the present invention , the frequency component of the facsimile communication procedure signal or the tone signal of the exchange is previously removed from the voice response message sent to the other party when receiving a call. Therefore, even in the middle of the voice response message, the facsimile can be selected by receiving the facsimile communication procedure signal or the tone signal of the exchange. In addition, the telephone line can be cut off in response to the tone signal of the exchange to be in a standby state.

[0012]

FIG. 1 is a block diagram showing a communication terminal according to an embodiment of the present invention. This device 5 includes a CPU 10,
Modem processor 12, analog front end 1
4, NCU (NETWORK-CONTROL-UNIT) 16, Voice ROM 1
8, a ROM 20, a RAM 22, and a bus line 24.

The ROM 20 stores a control program for the CPU 10 and the like, and the CPU 10 controls each unit according to the control program. The NCU 16 is an interface with a telephone line, and is connected to the bus line 24 via the analog front end 14 and the modem processor 12. At the same time, CPU1
Switching between the facsimile reception mode and the telephone reception mode is performed by the command of 0. Also, the modem processor 12
Is the original modem function, tone detection function, CPU
It has an interface function.

In this embodiment, the voice ROM 18 is manufactured so that the voice response message is stored after removing the frequency component of 1100 Hz in advance. Even if this frequency band is removed, there is no practical problem as a voice response message.

FIG. 2 shows a block diagram of the analog front end 14. The analog front end 14
Tone BPF (Band Pass Filter) 30, BP
An F32, a switch 34, an AMP 36, an LPF (low pass filter) 38, an A / D converter 40, and a D / A converter 42 are provided. Hereinafter, the operation of this device will be described with reference to FIGS.

First, in FIG. 1, when there is an incoming call from the other party, the CPU 10 reads the voice response message (see FIG. 4) stored in the voice ROM 18 and sends it to the analog front end 14 via the modem processor 12. .

As shown in FIG. 2, this digital signal is converted into an analog signal by a D / A converter 42,
After waveform shaping via AMP36 and LPF38, N
Output to CU16. This signal is sent as a voice response message to the other party over the telephone line.

The other party hears the voice response message, and presses a fax transmission start button if facsimile is desired. Thereby, a CNG signal (communication procedure signal) is sent from the other party.

This CNG signal is supplied to the tone / BPF (center frequency f _o 1100 Hz) 30 via the NCU 16. At this time, the switch 34 is connected to the S1 side. The signal is converted into a digital signal by the A / D converter 40 and input to the modem processor 12. The modem processor 12 samples this signal at a predetermined sampling frequency and detects it as a CNG signal. This CNG detection signal is sent to the CPU 10.

At this time, since the 1100 Hz frequency component has been removed from the voice response message signal in advance,
If the signal of the voice response message is the modem processor 1
Even if it goes around 2, it will not be erroneously recognized as a CNG signal.

A normal audio signal is supplied to the BPF 32 (the switch 34 is connected to the S2 side), and is similarly output to the modem processor 12.

In FIG. 1, when receiving a CNG detection signal within a predetermined period, CPU 10 sends a facsimile switching signal to NCU 16. As a result, the NCU 16 enters the facsimile reception mode. Therefore, even in the middle of the voice response message, it is possible to reliably detect the CNG signal and immediately receive the facsimile transmission of the other party.

If the other party wants a telephone call,
Since the CNG signal is not generated within the predetermined time, the CPU 10
Sends a telephone switching signal to the NCU 16. Upon receiving this switching signal, NCU 16 enters the telephone reception mode and calls the telephone.

Here, 1100 is obtained from the voice response message.
Hz is stored without removing the frequency component, for example,
It is conceivable to provide a band reject filter (BRF) in a circuit for detecting a CNG signal of the analog front end 14 to remove 1100 Hz. However, there is a drawback that the circuit becomes complicated and the cost increases. .
Therefore, as described above, using the audio ROM 18 from which 1100 Hz has been removed in advance (it is possible to duplicate it if one is produced) is superior in that the increase in cost can be suppressed without changing the circuit configuration.

When the other party hangs up during the voice response message , a tone indicating the state (for example, 400)
Hz) occurs. When the call ends,
Is intermittent sound emitted when the other party of the handset has been applied (sound of "Tsu Tsu"). Receiving this intermittent tone, it is recognized that the other party has disconnected the telephone, and the telephone line is disconnected. If this intermittent tone is not recognized forever, the telephone line will remain connected. In such a case, the 400 Hz frequency component is removed from the voice response message stored in the voice ROM 18 in advance,
As soon as this sound is generated, the telephone line may be cut off to enter a standby state.

Further, in the above embodiment, the voice response message of the voice ROM 18 manufactured in advance is used, but a voice response message input by the user of the apparatus may be used. In this case, the voice response message 1100H
It is necessary to remove the frequency component of z during recording.

[0027]

According to the communication terminal apparatus of the present invention , the frequency component of the facsimile communication procedure signal or the tone signal of the exchange is previously removed from the voice response message sent to the other party when receiving a call. Therefore, even in the middle of the voice response message, the facsimile can be selected by receiving the facsimile selection signal. This prevents erroneous connection to the facsimile without erroneously detecting the specific frequency component of the audio signal as a tone signal such as CNG. Further, even if the other party hangs up the telephone during the voice response message, the telephone line can be immediately cut off to be in a standby state.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a communication terminal device according to an embodiment of the present invention.

FIG. 2 shows a block diagram of an analog front end according to one embodiment of the present invention.

FIG. 3 is a diagram illustrating a basic configuration of a communication terminal device.

FIG. 4 is a diagram showing a voice response message.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... CPU 12 ... Modem processor 14 ... Analog front end 16 ... NCU 18 ... Voice ROM

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 1/00 104

Claims (1)

(57) [Claims] 1. A communication terminal device for sharing a telephone and a facsimile machine with one telephone line, a storage means for storing a voice response message from which a frequency component of a tone signal of an exchange has been removed in advance, Control means for sending a message to the other party, receiving a tone signal from the exchange in response to the message, disconnecting the telephone line and setting a standby state.