JPS62173844A - Signal converting device - Google Patents

Abstract

PURPOSE:To reduce the malfunction like drop-out information by converting a control signal for exchange connection, which is inputted and outputted with two binary (signal presence/absence) signals per each channel, to a quaternary level signal. CONSTITUTION:The output of an audio out-band frequency signal generator 1 of a certain level is connected to four level adjusters 2-5. Level adjusters 2-5 generate audio out-band frequency signals of four levels different from one another. Inputs '0' or '1' of binary input terminals 7 and 8 are connected to a selecting circuit 6, and one of four level inputs is selected by the combination of inputs and is transmitted as an FDM signal to a FDM line 9. The other party device discriminates FDM signals of four levels different from one another and converts them to signals of logical value '0'/'1' and outputs it.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used when two exchanges that input and output two exchange connection control signals for each channel are connected via an FDM line. The present invention relates to a signal conversion device.

[Conventional technology]

Conventionally, this type of signal converter has two channels per channel.
FDM (frequency
cy division'multiplex
system) line, and in the opposite direction,
After determining the presence or absence of an out-of-voice band frequency signal, the connection between the two exchanges is established by inversely converting it into two control signals required by the exchange.

[Problem that the invention seeks to solve]

In the conventional signal conversion device described above, the four types of information represented by the two input control signals are converted into two types of information, i.e., the presence or absence of an out-of-band frequency signal, resulting in missing information. will occur. Furthermore, in the opposite direction, two types of information are replaced with four types of information, so conversion must be performed to add new information. In order to perform such conversion so that two exchanges are connected correctly, it is necessary to track the temporal flow of the exchange connection control signals and decipher their meanings while converting them, which requires an enormous amount of hardware. It has the disadvantage of becoming.

An object of the present invention is to provide a signal conversion device that solves these drawbacks.

[Means for solving problems]

The signal conversion device of the present invention is a signal conversion device used when connecting exchanges that input/output two exchange connection control signals for each channel via an FDM line in an opposing state. F
means for transmitting the signal to a DM line, and detecting a voice band frequency signal from the received FDM signal, and determining whether the detected voice band frequency signal corresponds to one of the three different level states or an off state. The present invention is characterized in that it includes means for decoding the connection control signals into two connection control signals and outputting the signals to the exchange.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

1 and 2 are block configuration diagrams showing one embodiment of the present invention. FIG. 1 shows a frequency signal outside the audio band of the signal converter, and FIG. 2 shows a frequency signal outside the audio band of the signal converter. A frequency signal receiving section is shown in each figure.

In FIG. 1, a signal generator (SG) 1 generates an out-of-audio frequency signal at a constant level. The four level adjusters (L-ADJ) 2 to 5 adjust the level of the out-of-audio band frequency signal inputted from the signal generator 1 to four types of levels including an off state.

A selection circuit (SEL) 6 selects two connections per channel output from an exchange (not shown) from four types of level audio band-off frequency signals including disconnection input from the level adjusters 2 to 5. A frequency signal outside the audio band of one type of level assigned by a combination of input signals 7 and 8 represented by logic levels 1 or 0, which are control signals, is selected, and this signal is FDM-fed to an FDM line (not shown). Transmit as signal 9. The transmitted audio out-of-band signal is FD
It is sent to the receiving section in FIG. 2 via the M line.

In the receiving section shown in FIG. 2, the filter (FLT) 10 is
Out of the audio band from the input signal 16 received from the FDM line.
Detects a frequency signal, converts it to a DC level, and outputs it. 4
The two level determiners (L-DET>11 to 14 determine which predetermined level the DC level of the filter 10 corresponds to. The decoder (DEC) 15
The states of the outputs of these determiners 11 to 14 are decoded into output signals 17 and 18 each having a logical value of 1 or 0, and sent to an exchange (not shown) as a connection control signal for each channel.

〔Effect of the invention〕

As explained above, according to the present invention, four pieces of information included in two exchange connection control signals for each channel output from an exchange are converted into different levels of out-of-voice band-frequency signal wave signals and their disconnection states. By converting the control signals into FDM lines, converting them inversely, and regenerating the information contained in the original two control signals, two exchanges with two inputs and outputs per channel can be converted into FDM lines. This has the effect of making it possible to connect correctly via the

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an out-of-voice band frequency signal transmitting section of a signal conversion device according to the present invention, and FIG. 2 is a block diagram showing an out-of-voice band frequency signal receiving section of a signal conversion device according to the present invention. be. l... Signal generators 2 to 5... Level adjuster 6... Selection circuit 10... Filters 11 to 14... Level determiner 15... decoder

Claims (1)

[Claims] (1) In a signal conversion device used when connecting exchanges in a facing state via an FDM line, which inputs and outputs two exchange connection control signals for each channel, which are indicated by a logical value of 1 or 0, the exchange outputs The four types of information held by the two connection control signals are divided into three different level states of the out-of-band frequency signal and their disconnection state, which is a total of four types of information.
means for detecting a voice band frequency signal from the received FDM signal, and detecting the voice band frequency signal from the received FDM signal, and detecting the detected voice band frequency signal in the three different level states or disconnection; 1. A signal converting device comprising means for determining which of the states the signal corresponds to, decoding it into two connection control signals, and outputting the signals to an exchange.