JPS61154346A - Acoustic coupling modulator-demodulator - Google Patents

Abstract

PURPOSE:To prevent mis-transmission due to hooking-off of a handset during data transmission by generating a talking request signal to call an opposite station by key operation in switching data transmission into talking and transmitting the signal to the operator of the opposite station. CONSTITUTION:In switching the data transmission mode into the talking mode, when a talking request switch 9 is operated, a tone oscillating section 8 outputs a tone having a frequency not affecting the data transmission different from the frequency of a data transmission/reception carrier within the permissible frequency band to transmit a signal from a branch section 11 via a speaker 5, a handset 1 and a public telephone network to the opposite side. The signal is received from the handset 1 and a microphone 4 via a branch section 10 at the opposite side and when the signal is detected by a tone detection section 12, a buzzer 13 is energized. Thus, a talking request signal from the own station to the opposite station is transmitted and the talking is started by allowing the operators of the own station and the opposite station to hook off their handsets at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an acoustic coupling modulation/demodulation device that performs data transmission by alternately using a transmission line with a telephone call.

[Conventional technology]

A conventional device of this type is shown in FIG. In Figure 2,
I is a handset, 2 is a modulation unit that performs modulation for data transmission, 3 is a demodulation unit that demodulates received data, 4 is a microphone that is acoustically coupled to the handset I, and 5 is the handset 1.
7 is an interface section connected to a terminal device (not shown).

In a device configured in this manner, the operator uses the handset 1 to call the other party's station via the public telephone network (not shown), and after confirming line connection through the call, uses the handset 1 to perform acoustic coupling modulation and demodulation. Attach it to the device and start data transmission. However, as means of communicating to the operator, there has been no more than a transmitting/receiving data display indicating that transmission/reception is in progress, a modulation/demodulation carrier display, etc. on the vehicle.

[Problem that the invention seeks to solve]

In the above-mentioned conventional acoustic coupling modulation/demodulation device, when the handset is disconnected and the data transmission mode is returned to the call mode, the only way to confirm switching with the other party is by displaying that the transmission/reception is in progress. There is a risk that erroneous transmissions may occur due to removing the number 1, and to prevent this, there is a problem in that a separately installed subscriber telephone set must be used to communicate with the other party.

[Means for solving problems]

In order to solve these problems, the present invention provides an operation section for performing a call request operation, a transmitting section for transmitting a call request signal, a reception detecting section for receiving and detecting the call request signal, and an operation section for transmitting a call request signal to an operator. The apparatus is equipped with a means for transmitting information.

[Effect]

In the present invention, the generation of the call request signal for calling the partner station is controlled by the operating section, and the call request signal is transmitted to the operator of the partner station by the transmission means.

(Embodiment) An embodiment of the acoustic coupling modulation/demodulation device according to the present invention is shown in FIG. 1. In FIG. A call request switch as an operation unit for performing a request operation, 1
0.11 is a branching unit that branches signals, 12 is a tone detection unit as a reception detection unit that detects a call request signal, and 13
is a buzzer that serves as a means of communication to notify the operator of a call request. In FIG. 1, the same or equivalent parts as in FIG. 2 are given the same reference numerals. Like conventional devices, this device is connected to a counterpart station having the same configuration as the device through a public telephone network via a handset 1, and an interface unit 7 is connected to a terminal device.

Next, the operation of the device configured and connected in this way will be explained. When the call request switch 9 is operated, the tone transmitting section 8 outputs a tone at a frequency that does not affect data transmission, which is different from the data transmitting/receiving carrier wave within the permissible frequency band of the line, and outputs a tone from the branching section 11 on the same route as the data transmission. The signal is then transmitted from the speaker 5 and handset 1 to the other party's station via the public telephone network. At the other party's station, the data is received from the handset 1 and the microphone 4 via the branching section 10 along the same route as the data reception, and when the tone detecting section 12 detects the signal, the buzzer 13 sounds. That is, with this device, it is possible to send a call request notification from the own station to the other station, and when the operator of the other station and the operator of the own station simultaneously remove the handset 1,
It is now possible to start a call.

〔Effect of the invention〕

As described above, the present invention includes an operation section for performing a call request operation, a transmitting section for transmitting a call request signal, a reception detecting section for receiving and detecting the call request signal, and a transmission means for transmitting the call request signal to the operator. As a result, the local station can send a call request notification to the other party's station, which has the effect of making it possible to switch to a talk mode smoothly in practical use. This has the effect of preventing transmission.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an acoustic coupling modulation/demodulation device according to the present invention, and FIG. 2 is a block diagram showing a conventional acoustic coupling modulation/demodulation device. ■...Handset, 2...Modulation section, 3...Demodulation section, 4...Microphone, 5...Speaker,
7...Interface section, 8...Tone transmission section, 9...Call request switch, 10.11...
Branching section, 12... Tone detection section, 13... Buzzer.

Claims (1)

[Claims] In an acoustic coupling modulation/demodulation device that alternately operates data transmission and voice communication by alternately using a transmission path, the device includes an operation unit for performing a voice call request operation, a transmitting unit for transmitting a voice voice request signal, and a reception detection unit for receiving and detecting the voice voice request signal. What is claimed is: 1. An acoustic coupling modulation/demodulation device, comprising: a switching unit; and a transmission means for transmitting to an operator, the acoustic coupling modulation/demodulation device being capable of transmitting a switching request from a data transmission mode to a telephone call mode using the telephone call request signal to the operator.