JP2521040Y2 - Remote control device using telephone line - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling a device in a remote place using a telephone line.

[0002]

2. Description of the Related Art Conventionally, as the above-mentioned telephone line remote control device, a voice signal transmitted through a telephone line is amplified by an amplifier in a telephone terminal and broadcast to a predetermined area by a speaker connected to the amplifier. Some of them are controlled by a multi-frequency signal transmitted via a telephone line.

A multi-frequency signal is a standardized control signal used for dial transmission in a push-button telephone, for example, as shown in FIG.
Signals f0 to f of four different frequencies around z
3 and signals f4 to f7 of four different frequencies near 400 Hz each represent a total of 16 codes. For example, as shown in FIG.
It is transmitted while putting a pause between the transmitted multi-frequency signals. Following this multi-frequency signal, an audio signal is generally transmitted over the telephone line. That is, the multi-frequency signal and the audio signal are transmitted serially.

An example of a telephone line using remote control device using such a multi-frequency signal is shown in FIG. In the figure,
A serial signal composed of a multi-frequency signal and a voice signal is supplied to the telephone terminal 12 via a telephone line represented by the transformer 10, and is supplied to an amplifier 16 via a switch 14 which is normally closed. After being amplified here, the sound is amplified by the speaker 18. If the switch 14 is always closed, the multi-frequency signal is also amplified by the speaker 18. To prevent this, when the multi-frequency signal portion of the serial signal is detected by the multi-frequency signal detector 20, , Switch 14 is opened to prevent multi-frequency signals from being fed to amplifier 16. The multi-frequency signal is used not only for controlling the switch 14 but also for controlling other devices according to the code represented by the multi-frequency signal.

[0005]

However, in the above apparatus, since the multi-frequency signal and the audio signal are both audible frequency signals, the multi-frequency signal detector 20 erroneously detects the audio signal as the multi-frequency signal. However, there is a problem in that the switch 14 may be opened to block the audio signal.

[0006]

The present invention solves the above problems and comprises a multi-frequency signal detecting means and a serial signal processing means. The multi-frequency signal detection means is
A serial signal including a multi-frequency signal and an audio signal is received, and a signal indicating the presence / absence of the multi-frequency signal and a code represented by the multi-frequency signal when the multi-frequency signal exists are detected. The serial signal processing means includes filter means for receiving the code detected by the multi-frequency signal detecting means and changing the removal band so as to remove the audio frequency signal constituting the code. The serial signal processing means receives the serial signal and the signal of the multi-frequency signal detecting means, and when the signal of the multi-frequency signal detecting means indicates the absence of the multi-frequency signal,
The serial signal is passed as it is, and when the signal of the multi-frequency signal detecting means indicates the existence of the multi-frequency signal, the serial signal is passed through the filter means. The output of this serial signal processing means is input to the loudspeaker means.

The serial signal processing means includes a switching means, and when the signal of the multi-frequency signal detecting means indicates the absence of the multi-frequency signal, the serial signal is supplied as it is to the loudspeaking means to detect the multi-frequency signal. The switch means may be switched to provide a serial signal to the filter means when the signal of the means indicates the presence of a multi-frequency signal.

Further, the serial signal processing means does not have the switch means as described above, and uses the filter means to set the removal band when the signal of the multi-frequency signal detecting means indicates the absence of the multi-frequency signal. It can be set outside the audio signal band, or can be set to pass all frequencies.

[0009]

According to the present invention, when the audio signal portion of the serial signal is supplied to the multi-frequency signal detecting means, the serial signal processing means uses the serial signal at that time, that is, the audio signal as it is, to the loud sounding means. The audio signal is amplified. Further, when the multi-frequency signal portion of the serial signal is supplied to the multi-frequency signal detecting means, the multi-frequency signal detecting means of the multi-frequency signal detecting means removes the audible frequency signal forming the detected multi-frequency signal. Since the serial signal (multi-frequency signal) is supplied to the loudspeaking means through the filter means of the serial signal processing means whose removal band is controlled by the signal, the multi-frequency signal is removed and is not loudened.
Further, even if the multi-frequency signal detecting means erroneously detects the voice signal as the multi-frequency signal, only a part of the frequency components of the voice signal erroneously detected as the multi-frequency signal is removed. Can be fully understood by the listener and is unaware that a part of the audio signal has been removed.

[0010]

EXAMPLE As shown in FIG. 1, this example shows a transformer 3
Telephone terminal 3 connected to the terminal of the telephone line represented by 0
Have two. As described in the section of the related art, a serial signal including a multi-frequency signal and a voice signal is transmitted to the telephone terminal 32 through this telephone line.

The telephone terminal 32 has a multi-frequency signal detector 34 to which a serial signal is supplied from a telephone line. The multi-frequency signal detector 34 generates a presence signal indicating whether or not the multi-frequency signal is transmitted from the telephone line, and when the serial signal transmitted from the telephone line is the multi-frequency signal, the multi-frequency signal is output. Generate the code information signal that the signal represents.

Further, the telephone terminal 32 has a serial signal processing means 36, and the serial signal processing means 36 includes a delay circuit 38 for receiving a serial signal. The delay amount of the delay circuit 38 is obtained by adding the duration t1 in which one multi-frequency signal shown in FIG. 2 continues and the time required for the multi-frequency signal detector 34 to convert the multi-frequency signal into a code information signal. The selected time is about the time.

The output side of the delay circuit 38 has a changeover switch 4
This switch 40 is connected to the contact 40a of 0.
Is the two contacts 40 with which the contacts 40a are respectively in contact.
b, 40c, and the contact 40b is the low group notch filter 4
Connected to 2. This low group notch filter 42 is
The elimination band can be changed so as to eliminate any one of the signals f4 to f7 of four different frequencies near 400 Hz which constitutes one of the multi-frequency signals, and the elimination band is very narrow. It is set to the band.

The output side of the low group notch filter 42 is
It is connected to the high group notch filter 44. The high-group notch filter 44 is capable of changing the removal band so as to remove any one of the signals f0 to f3 of four different frequencies near 1600 Hz that constitute the other signal of the multi-frequency signal. , Its elimination band is set to a very narrow band.

The removal bands of the low-group notch filter 42 and the high-group notch filter 44 are changed based on the control signal generated by the decoder 46 according to the code information signal generated by the multi-frequency signal detector 34. The code information signal generated by the multi-frequency signal detector 34 is the decoder 46.
Besides, in order to control a control device (not shown), the control device is supplied to these control devices.

The output side of the high group notch filter 44 is connected to the contact 48b of the changeover switch 48. The changeover switch 48 has a contact 48c in addition to the contact 48b, and further has a contact 48a contacting the contacts 48b, 48c. The contact 48c is the changeover switch 40.
Is directly connected to the contact 40c.

The contact 48a of the changeover switch 48 is
It is interlocked with the contactor 40a of the changeover switch 40. The changeover control of the changeover switches 40 and 48 is as follows.
Is performed according to the presence / absence signal from the multi-frequency signal detector 34,
When the presence / absence signal indicates that the multi-frequency signal is not detected, the contact 40a contacts the contact 40c and the contact 48a contacts the contact 48c, and the multi-frequency signal detector 34
When the presence / absence signal indicates that a multi-frequency signal is detected, the contact 40a contacts the contact 40b and the contact 48a contacts the contact 48b.

That is, when the multi-frequency signal detector 34 does not detect the multi-frequency signal, the output signal of the delay circuit 38 is directly supplied to the amplifier 50, and the multi-frequency signal detector 34 detects the multi-frequency signal. At this time, the output signal of the delay circuit 38 is the low group notch filter 42 and the high group notch filter 44.
Is supplied to the amplifier 50 via.

The contact 48a of the changeover switch 48 is
The output signal of the amplifier 50 is connected to the amplifier 50,
It is supplied to the speaker 52 which is a loudspeaker.

In the remote control device using the telephone line constructed as described above, for example, as shown in FIG. 2A, f2 + f5,
Consider a case where a serial signal composed of each multi-frequency signal of f0 + f5 and f1 + f7 and an audio signal is sequentially supplied.
As shown in FIG. 2B, the first multi-frequency signal f2 + f5
Is generated on the output side of the delay circuit 38, the multi-frequency signal detector 34 has detected that it is a multi-frequency signal, and the contacts 40a, 48a of the changeover switches 40, 48 are connected to the contact 40.
2b, 48b side, as shown in FIG. 2 (c),
The multi-frequency signal f2 + f5 generated at the output side of the delay circuit 38 is supplied to the low group notch filter 42, and the output of the high group notch filter 44 is supplied to the amplifier 50.

At this time, the multi-frequency signal detector 34 has generated the code information signal represented by the multi-frequency signal f2 + f5, which is supplied to the decoder 46 and, as shown in FIG. 2 (d), the low group notch filter 42. , The removal band is changed so that the f5 signal can be removed, and the high band notch filter 44 has the removal band changed so that the f2 signal can be removed, as shown in FIG.

Therefore, of the multi-frequency signals f2 + f5 generated at the output side of the delay circuit 38, the f5 signal is removed by the low group notch filter 42 and the f2 signal is removed by the high group notch filter 4.
Removed at 4. Therefore, the multi-frequency signal is not amplified by the speaker 52.

When a pause period following the multifrequency signal f2 + f5 occurs at the output of the delay circuit 38, the multifrequency signal detector 3
4 does not detect the multi-frequency signal, the changeover switch 4
0, 48 contacts 40a, 48a are contacts 40c, 48
The output of the delay circuit 38 comes into contact with the amplifier 5 as it is.
It is supplied to 0, but since it is a pause period, the speaker 5
Nothing can be heard from 2 onwards.

The next multi-frequency signal f0 + f5 is the delay circuit 38.
, The multi-frequency signal detector 34 detects the multi-frequency signal.
0a and 48a contact the contacts 40b and 48b. Also,
Since the multi-frequency signal detector 34 generates the code information signal represented by the multi-frequency signal f0 + f5, the decoder 46 sets the removal band of the low group notch filter 42 to f5 and the removal band of the high group notch filter 44 to f0. Therefore, the multi-frequency signal f0 + f5 is also not amplified by the speaker 52.

Similarly, during the pause period and the period of the multi-frequency signal f1 + f7, nothing is similarly amplified from the speaker 52. However, when an audio signal is generated at the output side of the delay circuit 38, the multi-frequency signal detector. Since the multi-frequency signal detector 34 does not detect the multi-frequency signal, the multi-frequency signal detector 34 connects the contacts 40a, 48a of the changeover switches 40, 48 to the contacts 40c, 48.
Switch to c side. Therefore, the audio signal on the output side of the delay circuit 38 is directly supplied to the amplifier 50, amplified here, and then amplified by the speaker 52.

When an audio signal is generated at the input side of the delay circuit 38 and the multi-frequency signal detection circuit 34 erroneously detects the audio signal as a multi-frequency signal, the changeover switches 40 and 48 are selected.
The contactors 40a and 48a of the above are switched to the contact points 40b and 48b, and the audio signal is supplied to the low group notch filter 42 and the high group notch filter 44. At this time, the removal band of the low group notch filter 42 is set to any one of f4 to f7, and the removal band of the high group notch filter 44 is set to one of f0 to f3. Of the frequency components, any one of f4 to f7 and any one of f0 to f3 is removed. However, since the removed band is very narrow, the content of the call is not damaged. The listener will not even notice that some frequency components have been removed.

In the above-described embodiment, the changeover switches 40 and 48 are provided so that when the voice signal is supplied, the voice signal is directly supplied to the amplifier 50. However, these changeover switches 40 and 48 are removed, The output signal of the delay circuit 38 is supplied to the low-group notch filter 42 as it is, and when the multi-frequency signal detector 34 determines that it is not the multi-frequency signal, the removal band of the low-group notch filter 42 and the high-group notch filter 44. May be changed to outside the audio frequency band, or the low group notch filter 42 and the high group notch filter 44 themselves may be set to a through state (a state in which all frequencies are allowed to pass).

Further, the low-group notch filter 42 and the high-group notch filter 44 used in the above-described embodiments may be constituted by analog filters or digital filters.

[0029]

As described above, according to the present invention, a multi-frequency signal detector detects whether a serial signal transmitted from a telephone line is a multi-frequency signal or a voice signal. Since the stop band of the filter means included in the serial signal processing means is changed so as to remove the audio frequency signal forming the multi-frequency signal, the multi-frequency signal may be supplied to the loudspeaker means. Absent. In particular, even if the audio signal is erroneously detected by the audible frequency signal and the multi-frequency signal detector, only a part of the frequency component of the audio signal is removed by the filter means, so that the listener cannot understand the content of the call. This does not occur, and the listener does not recognize that a part of the audio signal has been removed.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a remote control device using a telephone line according to the present invention.

FIG. 2 is an operation explanatory diagram of the embodiment.

FIG. 3 is a block diagram of a conventional remote control device using a telephone line.

FIG. 4 is an explanatory diagram of a multi-frequency signal.

FIG. 5 is a waveform diagram of a multi-frequency signal.

[Explanation of symbols]

 30 telephone line 34 multi-frequency signal detector 36 serial signal detecting means 42 low group notch filter 44 high group notch filter 52 speaker

Claims (4)

(57) [Scope of utility model registration request] 1. A signal representing the presence or absence of the multi-frequency signal and the multi-frequency signal, which receives a serial signal composed of a multi-frequency signal representing various codes and a voice signal by a combination of signals of different audio frequencies transmitted from a telephone line. Multi-frequency signal detecting means for detecting a code represented by the multi-frequency signal when a signal is present, and a removal band in a state of receiving the code detected by the multi-frequency signal detecting means and removing the audio frequency signal constituting the code When the signal of the multi-frequency signal detecting means indicates the absence of the multi-frequency signal, the serial signal is changed to the serial signal. When the signal of the multi-frequency signal detecting means indicates the presence of the multi-frequency signal, the serial signal is output through the filter means. A telephone line use remote control device comprising: serial signal processing means for enabling the output of the serial signal processing means; 2. The remote control device for telephone line use according to claim 1, wherein the serial signal processing means, when the signal of the multi-frequency signal detecting means represents the absence of the multi-frequency signal, the serial signal. And a switch means for supplying the serial signal to the filter means when the signal of the multi-frequency signal detecting means indicates the presence of the multi-frequency signal. Remote control device for line use. 3. The telephone line use remote control device according to claim 1, wherein the filter means of the serial signal processing means, when the signal of the multi-frequency signal detecting means represents the absence of the multi-frequency signal, A remote control device using a telephone line, wherein the elimination band is set outside the voice signal band. 4. The telephone line use remote control device according to claim 1, wherein the filter means of the serial signal processing means, when the signal of the multi-frequency signal detecting means indicates the absence of the multi-frequency signal, A remote control device using a telephone line, characterized by allowing all frequencies to pass.