JPH0774690A - Cordless key telephone set - Google Patents

Abstract

PURPOSE:To improve the ease of use of the cordless telephone set by sending/ receiving control information such as lamp information to/from a master set even when the cordless telephone set is busy. CONSTITUTION:When a lamp signal to indicate a line busy state to the cordless telephone set 6 in a busy state from a master set 4 is received by a CPU 502 of a connector 5, the CPU 502 recognizes it that the cordless telephone set 6 is busy and provides a signal representing it not to a MODEM 505 but to an FSK transmission circuit 509. The FSK transmission circuit 509 converts the signal into a low frequency FSK signal and given to an FSK signal pass filter 510, in which a high frequency component of the FSK signal giving effect on a voice band is eliminated and the result is mixed with a voice signal and sent through an RF unit 607 and an antenna 508. Thus, the user recognizes the line operating state without any operation even when the cordless telephone set is busy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless button telephone device.

[0002]

2. Description of the Related Art The structure of a conventional cordless button telephone device and a cordless telephone in which a line button with an LED display is mounted is shown in FIG. Here, 1 is a main device, 2 is a connection device, and 3 is a cordless telephone. The connection device 2 includes a transmission circuit 201 and a CPU 20.
2, a codec 203, a voice passing filter 204,
It comprises a modem 205, a voice / modem switching circuit 206, an RF unit 207, and an antenna 208. The cordless telephone 3 has an antenna 308 and an RF unit 30.
7, voice / modem signal switching circuit 306, modem 30
5, a CPU 302, a voice passing filter 304, a receiving amplifier 309, a receiver 310, a transmitting amplifier 311, a microphone 312, a button group 301, and a lamp group 303. When the call button is pressed when making a call to a certain line, the CPU 302 on the side of the cordless telephone 3 detects this and the modem 305, voice / voice /
The signal is transmitted from the antenna 308 through the modem signal switching circuit 306 and the RF unit 307. On the connection device 2 side, the signal is received by the antenna 208, and the RF unit 207, the voice /
Modem signal switching circuit 206, modem 205, CPU2
02, is transmitted to the main device through the transmission circuit 201. When the main device 1 receives the call request signal, the main device 1 transmits to the connection device 2 a lamp signal indicating the line usage status at that time. In the connection device 2, the ramp signal is transmitted to the transmission circuit 201 and the CPU 20.
2, modem 205, voice / modem signal switching circuit 20
6, transmitted from the antenna 208 through the RF unit 207. On the side of the cordless telephone 3, the signal is received by the antenna 308, input to the CPU 302 through the RF unit 307, the voice / modem signal switching circuit 306, and the modem 305, and the line lamp according to the line use condition is turned on by the CPU control. As described above, when the user presses the call button, it is possible to display the line usage status at that time on the line lamp of the cordless telephone.

[0003]

However, since the modem signal uses signals within the voice band of 1200 Hz and 2400 Hz, the conventional cordless button telephone device is required to send and receive control signals such as a lamp signal during a call. I can't. Therefore, there is a drawback that the status of the corresponding line lamp is not displayed when a call is received or put on hold on another line during a call. Therefore, 1
Immediately after one call ends, another line (NCC (New Common
It was not possible to confirm whether or not the line was busy even if a new call was made with the carrier) or the leased line).

The present invention solves these problems and
It is intended to provide a cordless button telephone which is easy to use for a user by transmitting control information from a main unit even during a call.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a connection device with a FSK in addition to the conventional structure.
A signal transmission circuit, a voice passing filter, an FSK signal passing filter are provided, and the cordless telephone side has an FSK.
By providing a signal receiving circuit, a voice passing filter, and an FSK signal passing filter, it is possible to keep the outside of the voice band during a call.
Low frequency band FSK signal of 00 Hz or less (for example, 200H
z and 100 Hz) is multiplexed with a voice signal, modulated and transmitted through an antenna, demodulated in a cordless telephone, the voice signal and the FSK signal are separated, and the FSK signal is demodulated by the FSK reception circuit. By inputting into the CPU, it is possible to send and receive lamp information indicating the usage status of the line.

[0006]

Therefore, according to the present invention, the user can always know the usage status of the line without any operation even during a call using his or her cordless telephone, and it is possible to effectively use and easily use the LCR (least cost routine) line. It has the function of supplying a cordless telephone.

[0007]

FIG. 1 shows an embodiment of the present invention. 4 here
Is a main device, 5 is a connection device, and 6 is a cordless telephone. The connection device 5 includes a transmission circuit 501, a CPU 502, a codec 503, a voice passing filter 504, and a modem 5.
05, voice / modem switching circuit 506, FSK transmission circuit 509, FSK signal passing filter 510, RF unit 507, and antenna 508. The cordless telephone 6 includes an antenna 608, an RF unit 607,
FSK signal passing filter 613, FSK receiving circuit 61
4, voice / modem signal switching circuit 606, modem 60
5, a CPU 602, a voice passing filter 604, a reception amplifier 609, a receiver 610, a transmission amplifier 611, a microphone 612, a button group 601, and a lamp group 603.

During standby, the cordless telephone 6 from the main unit 4
The lamp signal indicating the line usage status for the connection device 5 is the transmission circuit 501, the CPU 502, the modem 505,
Voice / modem signal switching circuit 506, RF unit 50
7 is transmitted from the antenna 508. On the cordless telephone 6 side, the signal is received by the antenna 608, is input to the CPU 602 through the RF unit 607, the voice / modem signal switching circuit 606, and the modem 605, and the line lamp corresponding to the line use condition is turned on by the CPU control.

When the cordless telephone 6 is busy,
A voice signal from the main unit 4 to the cordless telephone 6 is digital-to-analog converted by a codec 503 in the connection unit 5, a voice pass filter 504 removes low frequency noise outside the band, and a voice / modem signal switching circuit 506. R
It is transmitted from the antenna 508 through the F unit 507. In the cordless telephone 6, the FSK signal is received by the antenna 608, passed through the RF unit 607 and the voice / modem signal switching circuit 606 to remove the FSK signal by the voice pass filter 604, amplified by the reception amplifier 609 and transmitted from the receiver 610.

As described above, when the cordless telephone 6 is in the call state, when the CPU 502 of the connection device 5 receives the lamp signal indicating the line use status for the cordless telephone 6 from the main device 4, the CPU 502 is cordless. When the telephone 6 recognizes that it is in a call state, it inputs this signal to the FSK transmission circuit 509 instead of the modem 505. The FSK transmission circuit 509 converts the signal into a low-frequency FSK signal, the FSK signal passing filter 510 removes harmonic components of the FSK signal that affect the voice band, and mixes with the voice signal to mix the RF unit 507 and the antenna. 5
Send through 08. In the cordless telephone 6, after receiving by the antenna 608 and passing through the RF unit 607,
In order to separate the audio signal and the FSK signal, the audio signal is removed by the FSK signal passing filter 613, and the FSK signal is F
It is input to the SK reception circuit 614 and demodulated into an NRZ code digital signal. The demodulated digital signal is FSK
Only the signal synchronized by the synchronization detection circuit in the reception circuit 614 is input to the CPU 602 of the cordless telephone 6,
Turn on or off the line status display lamp. The synchronization detection circuit can also be realized by software of the CPU 602.

With respect to how the lamp signal is controlled from the main unit 4 to the cordless telephone 6, an example of control of the CPU of the connection unit 5 and the cordless telephone 6 will be described below with reference to the operation flow of FIG. explain. The lamp signal from the main unit 4 is sent to the CPU 50 of the connection unit 5 via a wired transmission line.
Sent to 2 (S ₁ ). The CPU 502 of the connection device 5 determines whether the cordless telephone 6 is in a call or in a standby state (S ₂ ), and when the cordless telephone 6 is in a standby state, a wireless control channel (hereinafter referred to as Cch) and a wireless call channel (hereinafter referred to as Sch). Call) carrier sense. After carrier sense, the CPU 502 of the connected communication device 5 sets Cch
A cordless telephone connection request and Sch designation are transmitted at (S ₃ , S ₄ ). CPU of cordless telephone in standby
When Cch receives the connection request and the Sch designation from the connection device 5 (S ₅ , S ₆ ), it carries out carrier sensing of the Cch and the designated Sch, and sends a connection response on the Cch and S
Move to ch. When the CPU 502 of the connection unit 5 receives the connection response, it shifts to Sch, performs voice / modem switching control, disconnects the communication path (S ₇ ), and MSK.
Use the (MINIMUM Shift KEYING) signal to send the ramp signal to the Sch
Send to the top (S ₈ ). CPU 6 of cordless telephone 6
02 receives the ramp signal of the MSK signal on Sch and disconnects the communication path (S ₉ ). Performing lamp lighting control according to then received ramp signal (S _10). On the other hand, when the cordless telephone 6 is in a call, the CPU 502 of the connection device 5 multiplexes the lamp signal with the audio signal on the Sch by the FSK signal and transmits the multiplexed signal. The CPU 602 of the cordless telephone 6 receives the lamp signal of the FSK signal on Sch and controls the lamp lighting according to the lamp signal. As described above, by using the FSK signal outside the audio lower band, it is possible to transmit / receive data simultaneously with the audio signal without disconnecting the call, and it is possible to effectively operate the lamp lighting or the like.

[0012]

As described above, according to the present invention, even when a cordless telephone is in a call, it does not affect the call, and control information from the main device such as lamp information indicating the usage status of the line is transmitted. It becomes possible to transmit and receive, the usability of the cordless telephone is improved, and low-cost lines such as NCC and leased lines can be effectively used, which is functionally and economically effective.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing an example of a conventional cordless button telephone device.

FIG. 3 is a flowchart for explaining the operation of the present invention.

[Explanation of symbols]

1, 4 Main device 2, 5 Connection device 3, 6 Cordless telephone 201, 501 Transmission circuit 202, 302, 502 CPU 203, 503 Codec 204, 304, 504, 604 Voice pass filter 205, 305, 505, 605 Modem 206 , 306, 506, 606 Voice / modem switching circuit 207, 307, 507, 607 RF unit 208, 308, 508, 608 Antenna 301, 601 Button group 303, 603 Lamp group 309, 609 Receiver amplifier 310, 610 Receiver 311, 611 Transmission amplifier 312,612 Microphone 613 FSK signal passing filter 614 FSK receiving circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location 9076-5K H04Q 11/04 S

Claims (1)

[Claims] 1. A cordless button telephone device comprising a plurality of connecting devices connected to a main device by a plurality of cables, and a plurality of cordless telephones connected to the connecting devices by a wireless line, wherein: A frequency shift signal (hereinafter referred to as FSK signal) modulation circuit, an audio pass filter, an FSK signal pass filter having an FSK signal pass band in a band below the pass band of the audio pass filter, and an audio / FSK A mixing circuit for mixing signals is provided, and the cordless telephone has a voice passing filter and an FS.
A K signal pass filter and an FSK signal demodulation circuit are provided so that control information from the main unit to the cordless telephone can be transmitted and received via the FSK signal pass band even during a call on the cordless telephone. A cordless button telephone device characterized by being constructed.