JPS5921573Y2 - Acoustic data transmitter/receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an acoustic data transmitting and receiving device that uses an acoustic coupler to transmit and receive data to and from a called device, such as an offshore central processing unit.

Although the present invention is not limited to this, data is sent from the telephone, accessed to the central processing unit via the switchboard and telephone line, and the processing results are sent from the central processing unit to the client side via the telephone. Systems for outputting to devices are generally known.

In addition, in these conventional systems, the operator uses a telephone to connect the line on the terminal side, confirms the sound of a predetermined frequency indicating that the connection has been made from the center side, and then connects the line to the acoustic coupler installed in the terminal equipment. The handset is fixed.

However, conventional terminal devices are designed to constantly accept signals from acoustic couplers and, for example, to perform printing processing. It has the disadvantage that it is printed as data.

Therefore, an object of the present invention is to provide an acoustic data transmitting/receiving device that can eliminate these noises.

In order to achieve the above objective, the present invention focuses on the fact that data will not be sent from the called side unless the calling side sends it, and the operator handling the terminal device on the calling side inputs the data or The present invention is characterized in that a gate means is provided to enable the output of the acoustic coupler on the receiver side that receives acoustic data in response to pressing a key instructing transmission, etc., and to disable it until then.

The present invention will be described in detail below with reference to drawings showing embodiments.

In the diagram, CPU is a central processing unit (referred to as center), NCU
is the network control device, LF is the exchange, the phone is the telephone set, T and R are the sending and receiving handsets, ACT and ACR are the acoustic couplers for sending and receiving, KB is the keyboard, TBF is the sending buffer, RR is the receiving register, PR is the printer. , FF are flip-flops, and AI and A2 are AND gates.

The operator first notifies the exchange LF of the connection to the network control unit NCU in a known manner by turning a dial on the telephone equipment.

Exchange LF connects the telephone equipment to the corresponding NCU.

As a result, the network control unit NCU sends out a carrier of a predetermined frequency to the telephone line.

Since this carrier is set to an audible frequency, the operator confirms it using the receiver R and sets it to the acoustic couplers ACT and ACR, which are paired as a transmitter and receiver.

Next, the operator manually enters desired input data using the keyboard KB.

Keyboard KB responds to the pressed key, center device C
This data d is stored in the transmission buffer TBF in the input order as data for accessing the PU.

The operator presses the send button on the keyboard KB and the center CPU.
When an interrupt button or the like indicating an interrupt is pressed, the signal st
is output from the keyboard KB.

This signal st opens the AND gate A1, for example, while the data stored in the transmission buffer TBF is being sent out.

This can be done, for example, by providing a transmitting circuit that transmits the data in the transmitting buffer one bit at a time at a predetermined timing, and a counter that counts the timing, and closing an AND gate when the counter reaches a predetermined value. It can be realized if

On the other hand, this signal st sets the flip-flop FF and makes its output Q, for example, level "1".

This output Q opens the controller A2 so that the received data can be received into the receiving register RR.

The data sent to the acoustic coupler ACT via the computer AI is, for example, frequency modulated and input to the transmitter T, and is notified to the center CPU via the telephone line.

The center CPU processes the input data and sets the processing results in the reception register RR via the network control unit NCU, exchange LF, telephone set TFL, handset R1, acoustic coupler ACR, and analogue A2.

The data set in the reception register RR is transferred to the parallel register.
The data is then delivered to the printer PR every time a predetermined number of bits is reached, and is printed on a print medium by a character pattern conversion mechanism (not shown) of the printer PR.

If further data processing is required, the operator similarly inputs data from the keyboard KB and presses the send button.

As a result, the data is notified to the center CPU again.

However, from the second time onwards, the flip flow rough lower F is already in the set state and will not be reset.

Further, when a processing end key (not shown) provided on the keyboard KB is pressed when no processing is required for the center CPU, the flip-flop FF is reset using the signal sp.

If necessary, a timer or the like that detects the rising edge of a data key press signal should be used to monitor whether the period during which no data is input from the keyboard KB exceeds a predetermined time, and if the timer carries, that is, even if the predetermined time has been counted. , the flip-flop FF may be reset using an output signal that is not set by the rise of the data key press signal from the keyboard.

Furthermore, it is obvious that the gate means may be gated by a program on the receiving side.

As described above, according to the present invention, data is not input to the register for data processing by the gate circuit during the period when the handset is fixed to the acoustic coupler, so the circuit is simplified and malfunctions due to noise are prevented. It can be prevented.

[Brief explanation of the drawing]

The drawing is a block diagram of one embodiment of the present invention, where the CPU is the center, the NCU is the network control device, the LF is the exchange, the telephone is the telephone set, T and R are the transmitter, the receiver, and ACT and ACR are the transmitter and receiver. KB is a keyboard, PR is a printer, TBF is a transmitting buffer, and RR is a receiving register.

Claims (1)

[Scope of utility model registration request] An acoustic data transmitting/receiving device having an acoustic coupler connectable to a transmitter and receiver connected to a telephone line, and transmitting and receiving data between the acoustic coupler and an opposing called device via the telephone line, A gate means for gating a signal corresponding to acoustic data from a telephone receiver, a data input device for inputting transmission data to a telephone line, and a circuit for opening the gate circuit and receiving data according to an instruction from the data input device. What is claimed is: 1. An acoustic data transmitting/receiving device comprising: