JPH02298157A - In-band signal equipment - Google Patents

Abstract

PURPOSE:To set a cable equalizer and a level regulator automatically for correcting the transmission frequency characteristic in a subscriber line by detecting a signal sent from a sender side at a receiver side through the use of two oscillators and using them to control the receiver side. CONSTITUTION:A control section 21 of a transmission section 11 controls 1st and 2nd oscillators 15, 16 inputted to an input signal switching unit 19 so that the output is sent from a 2nd changeover device 22. The sent signal is reached to a respectively section 12 through a subscriber line 13. An A/D converter 25 A/D-converts a received signal in the reception section 12 and outputs of 1st and 2nd rectifiers 39, 42 and compared by a controller 43 through a level regulator 43 and one of plural cable equalizers 27-30. As a result, an optimum cable equalizer among the cable equalizers 27-30 corresponding to the difference of both the outputs is selected. Then the controller 43 regulates the setting value so that the output of the level regulator 32 is a desired value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an in-band signaling device that transmits and receives ringers within the voice band using a dedicated line.

[Conventional technology]

FIG. 2 shows a conventional in-band signal device. This in-band signal device includes a transmitter 51 and a receiver 5.
2, which are connected by a subscriber line 53.

Transmission R51: Well, the two line disconnections are 55.56 and
It is constituted by a transmitting circuit 57 for transmitting a ringer within the audio band of 0.3 to 3.4 KHz and adjusting the speech level.

The receiving section 52 includes a first line disconnector 59 that manually receives signals sent through the subscriber line 53, and a terminal connection selection circuit 61 connected to the first line disconnector (terminal connection selection circuit 61 connected to the subscriber line 59 side). , a plurality of cable equalizers 62 to 65 each having one end connected to this terminal connection selection circuit 61, and a terminal connection selection circuit 66 having each of the other ends of these cable equalizers 62 to 65 connected to each other. Yes.Terminal connection selection circuit 6
A level adjuster 67 is connected to the output side of 6 to adjust the speech level.

The output of the level adjuster 67 is input to a receiving circuit 68, and ringer detection is performed. A second line disconnector 69 is connected to this receiving circuit 68 .

In a conventional in-band signal device having such a configuration, when one of the cable equalizers 62 to 65 is selected and used to correct the transmission frequency characteristics in the subscriber line 53, an oscillator and a level meter are used. Prepare.

The line cutting section of the transmitting section 51 connects an oscillator to the device 56, and the first line cutting section of the receiving section 52 connects a level meter to the device 59. In this state, the output level of the oscillator is kept constant, the output frequency is varied, and the value is read with a level meter to measure the transmission frequency characteristics of the subscriber line 53. Then, after this, the cable equalizers 62 to 6
Select the most suitable one for the measured characteristics from among 5,
The settings were made using a terminal connection selection circuit 6166.

Next, a method of setting the level adjuster 67 will be explained.

When setting the level adjuster 67, the line cutter of the transmitter 51 connects an oscillator to the receiver 56, and the second line cutter of the receiver 52 connects a level meter to the receiver 69. Then, the output level of the oscillator is kept constant, its value is read with a level meter, and the level adjuster 67 is set so that the received output level becomes the reference value.

[Problem to be solved by the invention]

When installing such conventional in-band signal equipment, people are sometimes on standby on the transmitting and receiving sides, and the oscillator and level meter are used to measure the transmission frequency characteristics.Based on this, cables, etc. There is a problem in that it is necessary to select a converter and set a level adjuster, which takes time and effort.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an in-band signal device that can automate the selection of a cable equalizer and the setting of a level adjuster during installation.

[Means to solve the problem]

In the present invention, first and second oscillators that output signals of mutually different frequencies, signals output from these first and second oscillators, and an audio signal are input to a transmitter that constitutes an in-band signal device. an input signal switch for controlling the input signal switch; a controller for controlling opening/closing of the input signal switch;
and a transmitting circuit for transmitting the signal output from the second oscillator to the transmission path.

In addition, the receiving section of the in-band signal device has an A that converts the analog signal sent from this transmission path into a digital signal.
A/D converter, a plurality of cable equalizers, a switch that connects any one of these cable equalizers to the output side of the A/D converter, and connected cables, etc. A level adjuster sets the level of the signal passing through the oscillator, and the signal that has passed through the switch and level adjuster is branched into three, and two of these signals are used to generate the first and second oscillators. A frequency component extractor that individually extracts the frequency components of each output signal, a level adjuster that adjusts the level of these extracted frequency components, a rectifier that rectifies the output of these level adjusters, and these rectifiers. a controller that selects one of the cable equalizers of the switch and sets the level of the level adjuster by comparing the outputs of the switches;
A D/A converter is provided which converts the remaining signal after branching out of the signals that have passed through the switch and the level adjuster into an analog signal.

Then, based on the comparison result of the controller 43, the cable equalizer is selected to be the optimum one, and the level of the level adjuster is set to the optimum level, thereby achieving the above-mentioned purpose.

〔Example〕

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

FIG. 1 is a diagram illustrating an in-band signaling device in one embodiment of the present invention. This in-band signal device includes a transmitter 11
and a receiving section 12, which are connected by a subscriber line 13.

The transmitter 11 includes first and second oscillators 15 and 16, each having a different frequency. These oscillators 1
5.16 is the first line switch 17 and 0.3 to 3.
An input signal switch 19 together with a transmission circuit 18 for sending out a ringer within the 4KHz audio band and adjusting the call level.
It is connected to the. This input signal switch 19 includes first and second oscillators 15,16 and a first line switch 1.
The signals manually input from 7 are switched, and the switching control is performed by the controller 21. The signal selected by the input signal switch 19 is input to the transmission circuit 18 and sent to the subscriber line 13 via the second switch 22.

The receiving unit 12 includes a first line disconnector 24 that manually inputs the signal sent through the subscriber line 13, and an A/C converter 24 that converts the analog signal output from here into a digital signal.
A D converter 25 is provided.

The signal that has passed through the A/D converter 25 is input to a switch 26. The switch 26 has a configuration in which a plurality of cable equalizers 27 to 30 are arranged for correcting the transmission frequency characteristics in the subscriber line, and these are automatically switched. The output of the switch 26 is input to a level adjuster 32, level adjusted, and then branched into three.

One of these signals is input to the D/A converter 33, and the digital signal is converted back into an analog signal.

The returned analog signal is supplied to the receiving circuit 34, and its output is adjusted to an appropriate level. The output of the receiving circuit 34 is input to a second line disconnector 35.

The output of the level adjuster 32 is also supplied to a frequency 1 component extractor 36 and a frequency 2 component extractor 37.

Among them, the frequency one component extractor 36 is connected to the first oscillator 150.
Extract frequency component sound. The level of this frequency component is adjusted by a first level adjuster 38, and then rectified by a first rectifier 39.

The frequency two component extractor 37 extracts the frequency component of the second oscillator 16. The level of this frequency component is adjusted by a second level adjuster 41, and then rectified by a second rectifier 42.

The outputs of the first and second rectifiers 39, 42 are input to the controller 43 and compared. The controller 43 calculates the set values for the switch 26 and the level adjuster 32 from this comparison result.

A method for automatically setting the cable equalizers 27 to 30 and the level adjuster 32 using the switch 26 in the in-band signal device configured as described above will be described.

The controller 21 of the transmitter 11 controls the input signal switch 19 so that the outputs of the first and second oscillators 15 and 16 are sent out from the second switch 22 . The transmitted signal is delivered to the receiving section 12 through the subscriber line 13. Note that the outputs of the first and second oscillators 15 and 16 are set to, for example, 620 Hz and 2300 Hz.

In the receiving section 12, the received signal is converted into A/D by an A/D converter 25.
Convert. The converted digital signal is sent to any one of the plurality of cable equalizers 27 to 30 and a level adjuster 32.
through the first and second rectifiers 39 at the controller 43.
．． 42 outputs are compared. As a result, the controller 43 controls the switch 26 so as to select the optimum cable equalizer 27 to 30 according to the difference between the cable equalizers 27 to 30. Once the optimum one of the cable equalizers 27 to 30 is selected in this way, the controller 43 adjusts the set value of the level adjuster 32 so that the output thereof becomes a desired value. [Effects of the Invention] As explained above, according to the present invention, a signal sent from the transmitting side using two oscillators is detected on the receiving side, and this is used to control the receiving side. Therefore, it is possible to automatically set fixtures such as cables and level adjusters for correcting transmission frequency characteristics in subscriber lines.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the circuit configuration of an in-band signal device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the circuit structure of a conventional in-band signal device. 11... Transmitting section, 12... Receiving section, 1
3... Subscriber line, 15... First oscillator, 16... Second oscillator, 19... Input signal switch, 21.43 ...Controller, 26...Switcher, 32...Level adjuster, 36...Frequency 1 component extractor, 37...
- Frequency two component extractor, 38... First level adjuster, 39... First rectifier, 41... Second level adjustment W i3.42.・・・
...Second rectifier.

Claims (1)

[Claims] First and second oscillators that output signals with different frequencies, an input signal switch that inputs the signals output from the first and second oscillators and an audio signal, and the input signal a controller for controlling opening/closing of the switch, an audio signal and the first
and a transmitting circuit that sends the signal output from the second oscillator to the subscriber line, and an analog-to-digital converter that converts the analog signal sent from the subscriber line into a digital signal. a plurality of cable equalizers, a switch for connecting any one of the cable equalizers to the output side of the analog-to-digital converter, and a switch for connecting any one of the cable equalizers to the output side of the analog-to-digital converter; A level adjuster that sets the level, and a signal that has passed through the switch and level adjuster is branched into three, and two of the signals are used to frequency the signals output from each of the first and second oscillators. A frequency component extractor that extracts the components individually, a level adjuster that adjusts the level of these extracted frequency components, a rectifier that rectifies the outputs of these level adjusters, and a method that compares the outputs of these rectifiers and A controller that selects one of the cable equalizers of the switch and sets the level of the level adjuster, and converts the remaining signal after branching out of the signals that have passed through the switch and the level adjuster into an analog signal. 1. An in-band signal device comprising: a receiving section having a digital-to-analog converter.