JPH0750957B2 - Remote monitoring control system - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote monitoring control system, and more particularly to a remote monitoring control system having a digital transmission circuit for transmitting a PCM voice signal and a monitoring control signal in a digital wireless communication system. Regarding

[Conventional technology]

Conventionally, two digital service lines of a digital radio transmitter / receiver are used as a signal transmission line of a distant monitoring control device, one line is used for transmitting a PCM voice signal, and the other one line is a pulse train. The PCM voice signal and the supervisory control signal used one digital service line each.

The PCM audio signal is configured such that each PCM code forming the PCM audio signal includes 7 audio bits and 1 unused bit used for signaling or the like. Normally, one bit for synchronization is added to the position of the code bit in order to establish synchronization when the PCM audio signal is transmitted.

[Problems to be Solved by the Invention]

The above-mentioned conventional distant monitoring control method requires a transmission line of a telephone line for a meeting to connect each station to each other when a monitoring control station or a monitored control station in which the distant monitoring control device is installed is added, In addition, there is a problem that the digital service line becomes insufficient, such that the number of monitor control items increases and the number of monitor control signals to be transmitted increases, which requires a transmission line for that.

An object of the present invention is to enable transmission of both a voice signal and a supervisory control signal by one digital service line,
It is an object of the present invention to provide a distant monitoring control method capable of effectively utilizing a digital service line.

[Means for Solving the Problems]

The distant monitoring control system of the present invention is a PCM audio signal received from a digital wireless communication line, and a transmission transmission circuit that sends out a PCM audio signal received from an audio signal circuit and a monitoring control signal received from the monitoring control circuit to a digital wireless communication line. In the distant monitoring control system, which comprises a reception transmission circuit for transmitting a signal to the voice signal circuit and transmitting a monitoring control signal received from a digital wireless communication line to the monitoring control circuit, ) A transmission voice signal accumulating unit which receives the PCM voice signal, temporarily stores it in a built-in storage circuit, and serially reads and outputs the bits of the PCM voice signal by a voice read signal, (B) the monitoring control signal A transmission supervisory control signal that receives and temporarily stores in a built-in storage circuit, and serially reads and outputs the bits of the supervisory control signal by a supervisory control read signal. An accumulating section, (C) receiving the PCM audio signal and the supervisory control signal output from the audio signal accumulating section and the supervisory control signal accumulating section by transmitting the audio read signal and the supervisory control read signal, Every other PCM code included in the received PCM audio signal is selected, and one bit among the bits of the supervisory control signal is taken in the output order at the unused bit position in the selected PCM code. Generating and adding, generating a PCM code with a supervisory control bit composed of a voice bit of the PCM code and an additional supervisory control signal bit, and alternately sending the PCM code with a supervisory control bit and the PCM code A signal synthesizing circuit unit for outputting a PCM sound signal with a supervisory control bit by (D) receiving the PCM sound signal with a supervisory control bit output from the signal synthesizing circuit unit, and using an unused bit in the PCM code. And a transmission frame synchronization circuit unit for generating and transmitting a PCM audio signal with a synchronization and supervisory control bit by adding one frame synchronization signal bit to the position of The PCM with sync and supervisory control signal bit is received and the received PCM with sync and supervisory control bit is received.
A reception frame synchronization circuit unit that detects a frame synchronization signal from an audio signal and outputs the PCM audio signal with the monitoring control bit, (F) Receives the PCM audio signal with the monitoring control bit output from the reception frame synchronization circuit unit Then, the monitor control bit is separated from the PCM code with the monitor control bit into a PCM code, and the monitor control signal bit and the PCM code are separately output. (G) The PCM from the signal separation circuit section A reception voice signal storage unit that receives a code, temporarily stores it in a built-in storage circuit, reads it out in series, and outputs it as the PCM voice signal; (H) receives the monitoring control bit from the signal separation circuit unit. A reception supervisory control signal accumulating section for temporarily storing in a built-in storage circuit, sequentially reading out and outputting as the supervisory control signal, is configured.

〔Example〕

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

FIG. 1 is a block diagram of an embodiment of the present invention.

In the remote monitoring control system of FIG. 1, the PCM audio signal received from the audio signal circuit and the monitoring control signal received from the monitoring control circuit are combined and sent to the digital wireless communication line as a PCM audio signal with synchronization and monitoring control bits. Transmission / transmission circuit 1 Separates the PCM audio signal and the supervisory control signal from the PCM audio signal with synchronization and supervisory control bits received from the digital wireless communication line, sends the PCM audio signal to the audio signal circuit, and monitors the supervisory control signal. Send to control circuit. It is composed of the reception transmission circuit 2.

Further, the transmission transmission circuit 1 includes a transmission voice signal storage unit 3 that temporarily stores and outputs a PCM voice signal, a transmission monitoring control signal storage unit 4 that temporarily stores and outputs a monitoring control signal, and a transmission voice signal storage unit. Received from the signal synthesizing circuit unit 5 and the signal synthesizing circuit unit 5, which adds the supervisory control signal bit read from the transmission supervisory control signal accumulating unit 4 to the PCM voice signal read out from No. 3 and outputs it as a PCM voice signal with supervisory control bit. The transmission frame synchronization circuit section 6 outputs a PCM audio signal with synchronization and supervisory control bits by adding a frame synchronization signal bit to the PCM audio signal with supervisory control bits.

Furthermore, the receiving and transmitting circuit 2 is a PC with synchronization and supervisory control bits.
Reception frame synchronization circuit section 7 that receives the M audio signal, detects the frame synchronization signal from the received PCM audio signal with synchronization and supervisory control bits, and outputs the PCM audio signal with supervisory control bits, the received PCM with supervisory control bits Audio signal to PCM
Received voice signal storage that temporarily outputs the PCM code received from the signal separation circuit unit 8 and the signal separation circuit unit 8 that separates and outputs the code and the supervisory control signal bit After temporarily storing the supervisory control signal bits received from the unit 9 and the signal separation circuit unit 8,
It is composed of a reception monitoring control signal accumulating section 10 which outputs a reading monitoring control signal in series in sequence.

Next, the operation will be described.

FIG. 2 is an explanatory diagram showing a pulse train of a PCM audio signal.

As shown in FIG. 2, a voice signal converted into PCM by a voice signal circuit is composed of a PCM code having 7 voice bits and 1 unused bit used as a bit for signaling. There is.

The PCM voice signal having a transmission rate of 64 kb / s sent from the voice signal circuit is input to the transmission voice signal storage unit 3 and temporarily stored in the built-in voice signal storage circuit.

On the other hand, the supervisory control signal sent from the supervisory control circuit is received by the transmission supervisory control signal storage unit 4, and is temporarily stored in the built-in supervisory control signal storage circuit.

FIG. 3 is an explanatory diagram for explaining the timing of the pulses of the audio signal and the supervisory control signal.

The signal synthesizing circuit unit 5 serially reads the bits of the PCM voice signal and the supervisory control signal from the storage circuits of the transmission voice signal accumulating unit 3 and the transmission supervisory control signal accumulating unit 4 in the order in which they are written, and FIG. As shown in (a), every other PCM code, 1 bit of the monitor control signal M is added to the position of an unused bit to add 1 bit of the 7-bit monitor control signal M of the audio bits D _{1 to} D ₇ of the PCM code. Bits are combined with monitoring control bit
Output as a PCM audio signal.

The transmission frame synchronization circuit unit 6 adds a frame synchronization bit F to the PCM audio signal with supervisory control bits received from the signal synthesis circuit unit 5 as shown in FIG. It is sent as a PCM audio signal with 64 kb / s synchronization and supervisory control bits. The frame sync bit F is added every time 14 audio bits of the PCM code and 1 bit of the monitor control signal are transmitted.

Conventionally, one sync bit was inserted for every seven audio bits of each PCM code, but every other PCM code, one bit of the supervisory control signal is inserted instead of the sync bit. Thus, even if the synchronization bit insertion interval is lengthened, the time taken for synchronization is lengthened accordingly, and there is no practical effect on the stability of synchronization.

The above is the description of the case where the PCM voice signal and the monitor control signal are combined and sent to one digital service line of the digital wireless communication line.

On the contrary, a case will be described in which a PCM voice signal with synchronization and supervisory control bits, which is a combination of a PCM voice signal and a supervisory control signal, is received from one digital service line of the digital radio communication line.

The PCM voice signal with synchronization and supervisory control bits received from one digital service line of the digital wireless communication line is input to the reception frame synchronization circuit unit 7. The reception frame synchronization circuit unit 7 detects the frame synchronization bit to establish synchronization, removes the synchronization bit from the PCM audio signal with synchronization and supervisory control bits, and sends it to the signal separation circuit unit 8 as a PCM audio signal with supervisory control bits. . The signal separation circuit unit 8 separates the supervisory control signal bit from the transmitted PCM audio signal with supervisory control bit. The separated supervisory control signal bit and PCM code are sent to the received voice signal accumulator 9 and the received supervisory control signal accumulator 10, respectively.

The PCM code sent to the received voice signal storage unit 9 is temporarily stored, then sequentially read and sent to the voice signal circuit as a PCM voice signal. Further, the monitoring control signal bits sent to the reception monitoring control signal storage unit 10 are temporarily stored and then sequentially read out and sent to the monitoring control circuit unit as a monitoring control signal.

As described above, by alternately adding the sync bit and the supervisory control signal bit to the position of the unused bit of the PCM code which has been conventionally used to add the sync bit of the PCM audio signal, the supervisory control of the remote supervisory controller is performed. Signal and PCM voice signal can be transmitted using one digital service line,
It is possible to effectively utilize the digital service line.

〔The invention's effect〕

As described above, according to the present invention, by adding the sync bit and the supervisory control signal bit alternately to the position of the unused bit of the PCM code which has been conventionally used for adding the sync bit of the PCM audio signal, The supervisory control signal and the voice signal of the supervisory control device can be transmitted using one digital service line, and the digital service line can be effectively used.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a PCM.
FIG. 3 is an explanatory diagram showing a pulse train of an audio signal, and FIG. 3 is an explanatory diagram illustrating the timing of bits of the audio signal and the supervisory control signal. 1 ... Transmission transmission circuit, 2 ... Reception transmission circuit, 3 ... Transmission voice signal storage section, 4 ... Transmission monitoring control signal storage section, 5 ...
... Signal synthesis circuit section, 6 ... Transmission frame synchronization circuit section, 7
...... Reception frame synchronization circuit section, 8 …… Signal separation circuit section,
9 ... Received voice signal storage section, 10 ... Reception monitoring control signal storage section.

Claims (1)

[Claims] 1. A transmission transmission circuit for sending a PCM voice signal received from a voice signal circuit and a supervisory control signal received from a supervisory control circuit to a digital wireless communication line, and a PCM voice signal received from a digital wireless communication line. In a distant monitoring control system having a reception transmission circuit for transmitting to the signal control circuit and for transmitting a monitoring control signal received from a digital wireless communication line to the monitoring control circuit, the transmission transmission circuit includes: (A) the PCM voice A transmission voice signal storage unit that receives a signal, temporarily stores it in a built-in storage circuit, and serially reads and outputs the bits of the PCM voice signal according to a voice read signal. (B) Receiving the monitoring control signal and incorporating it A storage supervisory control signal accumulating section for temporarily storing in a storage circuit for storing, and serially reading and outputting the bits of the supervisory control signal in response to the supervisory control read signal, (C) The PCM voice signal and the supervisory control signal which are output from the voice signal storage unit and the supervisory control signal storage unit by transmitting the voice read signal and the monitor control read signal, respectively, and the received PCM voice Every other PCM code included in the signal is selected, and one bit of the bits of the supervisory control signal is extracted and added to the position of the unused bit in the selected PCM code in the order in which it is output. A PCM code with a supervisory control bit is generated by generating a PCM code with a supervisory control bit consisting of a voice bit of the code and an additional supervisory control signal bit, and alternately sending the PCM code with a supervisory control bit and the PCM code. A signal synthesizing circuit unit for outputting as a voice signal, (D) receiving the PCM voice signal with the supervisory control bits output from the signal synthesizing circuit unit, and inserting a frame at an unused bit position in the PCM code. A transmission frame synchronization circuit section for generating and transmitting a PCM audio signal with a synchronization and monitoring control bit by adding one bit of a synchronization signal bit, and the reception transmission circuit comprises: (E) the synchronization and monitoring. PCM with control signal bit Receives the audio signal and receives the synchronization and supervisory control bit with PCM
A reception frame synchronization circuit unit that detects a frame synchronization signal from an audio signal and outputs the PCM audio signal with a supervisory control bit, (F) Receives the PCM audio signal with a supervisory control bit output from the reception frame synchronization circuit unit Then, the monitor control bit is separated from the PCM code with the monitor control bit into a PCM code, and the monitor control signal bit and the PCM code are separately output, (G) PCM from the signal separation circuit section A received voice signal storage unit for receiving a code, temporarily storing it in a built-in storage circuit, reading it out in series and outputting it as the PCM voice signal; (H) receiving the supervisory control bit from the signal separation circuit unit. A remote monitoring control signal accumulating section for temporarily storing in a built-in storage circuit and sequentially reading out and outputting as the monitoring control signal. One-way monitoring control method.