JPH02222256A - Simultaneous transmission control system for voice and data by cordless telephone set - Google Patents

Abstract

PURPOSE:To avoid data mis-recognition of a data by an exchange by applying dial muting at a connector provided at a base station during transmission period of data sent from a MODEM. CONSTITUTION:A dual tone multi-frequency generation IC 2 generates a DTMF tone from high and low group 2 frequency bands and when a handset of a base station is hooked off and a speech line is made, a CPU 1 of a control section (CONT) sends a dial mute command to a mobile station to block the voice transmission in the case of sending the data. Then the CPU 1 of the control section gives a command to a radio equipment of the base station to stop the transmission of the transmission mute to block the transmission of the voice output for the reply period of the base station with respect to a MO DEM data signal sent from the mobile station to the base station. Thus, a long data in the case of sending data and voice through the use of the dual tone multi-frequency is recognized without any error.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention is a wireless transmitter/receiver connected to a telephone connected to an exchange through a connecting device, which is used as a base station to communicate with a mobile radio transmitter/receiver by voice communication. In a transmission system using dual tone multi-frequency, which simultaneously transmits calls and data via a wireless line, 1lil? Concerning the method.

``Prior art'' As various data transmission services have come into use in addition to conventional telephone calls, multi-service systems for voice and data that include a CPU have become known, and as a method for simultaneously transmitting voice and data, There is a time division multiplexing method that allocates time slots for audio and data in advance, and a method that detects a silent section of audio during data transmission and inserts and multiplexes data during this period.

However, all of the above methods are technologies adopted in wired systems, and when a base station and a mobile station connected to an exchange transmit voice and data via a wireless link, dual tone multi-frequency (DTMF) is used. ＞, the identity of the other party is determined, the PIN number and password are entered, the key switch (key button) is pressed once, and a mutual confirmation procedure is performed between the mobile station and the base station, and then voice and data transmission begins in earnest. It's about to go into service.

Therefore, it is not a problem that voice is also transmitted while data is being transmitted until the telephone line is connected, that is, before the exchange is connected to the telephone line. When data is transmitted, it is inevitable that a problem will occur in which the AC machine does not correctly recognize the data.

"Problems to be Solved by the Invention" As described above, the present invention provides a method that allows long data to be recognized without error when transmitting voice and data using dual tone multi-frequency using a cordless telephone. It is in.

``Means for Solving the Problems'' Thus, the present invention provides a dial-mute function in a connection device provided at a base station during data transmission from a modem (modulator/demodulator) built into a wireless transceiver of a mobile station. The CPU issues a control command to cut off the audio frequency component by multiplying by .

An embodiment of the present invention will be explained in detail below with reference to the drawings.

``Example'' First, Figure 1 is a wiring diagram of a control unit including a CPU and a dual tone multi-frequency generation IC built in a connection device installed between a base station telephone and an exchange. FIG. 2 is a data transmission/reception time chart between the mobile station's handy wireless transceiver and the base station's connecting device.

The connection device has a built-in modem, a speech line network, and the control section, and the mobile station's handy radio transceiver has a built-in modem. Here, the modem generates modem data as a sine wave using a ladder resistor RIR2R3R4 as shown in FIG. 1, which is sent to the modem via a compander and added to the speech circuitry along with the dial mute signal. In addition, the input side of the dual tone multi-frequency generation IC is 1,209.1.336.1 for the dial buttons arranged in the row direction.
, 697°770.852,941Hz for the high group of 477.1,622Hz and the dial buttons lined up in the row direction
It has a matrix configuration in which each frequency of the low group is combined, and a DTMF tone is created from the two frequencies of the high and low groups.

Now, when a mobile station sends out a modem data signal to a base station, the base station sends a reply to the mobile station via a wireless device via a connecting device to confirm the other party's identity, and then enters a password. After the mobile station returns the information and password from the mobile station to the base station, the next service, that is, voice or data transmission, is performed. However, if the base station's exchange is off-hook and the telephone line is established, the control unit The CPU of C0NT issues a dial mute command to the mobile station to prevent audio transmission.

In response to modem data signals transmitted from the mobile station to the base, the CPU of the control unit instructs the base station's radio to mute transmission during the reply transmission period to prevent the transmission of audio output during the reply period of the base station. to stop sending.

Next, a specific example will be explained.

For example, when attempting to make a call or exchange data with a party called 177, a wireless link is established to the base station by pressing the call button on the handset of the mobile station. Next, data including communication channel information is first converted into each other via the control channel. During this time, both stations are muted for transmission and speaker muted to prevent voice transmission, and modem data signals are transmitted to the base station.

When the mobile station and the base station recognize each other's communication data, they shift to the communication channel and start data exchange, and when they recognize each other, both stations cancel mute by 0 or more operations,
This procedure establishes an off-hook state and allows you to hear the dial tone.

When the mobile station dials 1.7.7 for the first time, the base station's exchange connects the other party's line.The base station then recognizes the DTMF data, so passwords and the like can be confirmed using this data.

When the mobile station transmits a password, for example 9.8.7.6, as modem data to the base station, the base station transmits a DTMF tone corresponding to the data to the exchange. The other party will then identify the DTMF tone and check it against the password.

Therefore, the dial mute can prevent the transmission of voice signals while transmitting DTMF tones to the other party, thereby achieving accurate transmission of the password.

Here, the modem data from the mobile station and the above DTMF tone are not necessarily synchronized as shown in Figure 2, and the
If the dial mute is released approximately 2 to 3 seconds after the transmission of the TMF tone, the modem data signal from the mobile station will not be transmitted to the other party via the exchange.

``Effects'' Thus, according to the present invention, when mutual communication between voice and data in bank account balance inquiries, seat reservations, etc. is performed via a wireless link, dial data is sent to the base station after modem data transmission/reception confirmation. Not only can this be easily achieved by commands from the CPU built into the base station connection device to prevent the transmission of voice signals during the data transmission period, but it also prevents the base station exchange from misidentifying data. This contributes to smooth dual-tone multi-frequency voice and data communication.

[Brief explanation of the drawing]

Figure 1 is a wiring diagram of a control unit built into a connecting device interposed between an exchange and a telephone set in a base station of a cordless telephone system, and Figure 2 is a wiring diagram of a control unit built into a connecting device interposed between an exchange and a telephone set in a base station of a cordless telephone system. This is a time chart of data etc. that are transmitted and received. C0NT, (filJM5) 1: CPU 2: DTMF I
C3: Ladder resistor C0NT,: Control section

Claims (1)

[Claims] In a communication system in which voice and data are simultaneously transmitted between a wireless transmitter/receiver connected to a base station telephone connected to a central office line of an exchange via a connecting device and a wireless transmitter/receiver of a mobile station, the above-mentioned connecting device transmits the dial number to the above exchange with a dual tone multi-frequency DTMF tone based on a combination of high and low frequencies, and a dial mute signal using a pulse tone during the voice frequency transmission period. A mute signal for suppressing the transmission of wirelessly transmitted voice signals from the station and an MSK-modulated modem data tone are wirelessly transmitted, and during the transmission period of the DTMF tone to the exchange, frequency components such as voices are not input to the exchange. A method for controlling the simultaneous transmission of voice and data using a cordless telephone, which is characterized by being cut off by dial muting.