JP2801105B2 - Busy ring tone transmission circuit for cordless button telephone system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring tone transmitting circuit for a cordless button telephone system.

[0002]

2. Description of the Related Art A main device, a plurality of connecting devices, and a plurality of cordless telephones are provided. A plurality of external lines are accommodated in the main device, and the main device and the connecting devices are connected by a wired line, and the connecting device and the cordless telephones. A cordless button telephone system has been put to practical use in which a telephone line is connected to the outside line and the cordless telephone or between the cordless telephones.

In such a cordless button telephone system, the number of telephone lines accommodated in the main device (the sum of the external line and the internal line) is usually larger than the number of connected devices, so that all of the connected devices are in use (via the communication channel). During the call or during the setting control of the communication channel via the control channel),
Incoming calls from outside lines may occur,
Even if there is a cordless telephone that is not on a call, the cordless telephone cannot respond to an incoming call outside line.

For this reason, in such a case, a busy ring tone is transmitted to the cordless telephone during a call to inform the user of the cordless telephone that there is an unanswered incoming external line. Although it is prevented from being left unanswered for a while (the user of the cordless telephone that listens to the busy ringtone ends the current call or temporarily suspends the call and makes a new call. Can respond.), With traditional cordless button telephone systems,
The busy ringtone is transmitted from the main device.

[0005]

According to the above-mentioned prior art, a ringtone during a call is superimposed on a call voice in a main unit.
Since the communication path in the main unit is a two-way communication path, the ringing tone is also transmitted to the cordless telephone and to an external line that is already in communication with the cordless telephone.
Often important to the user, etc.
I) There is a problem that the subscriber on the outside line side (at the other end of a telephone conversation with the cordless telephone) is confused.

SUMMARY OF THE INVENTION The present invention proposes a solution to the above-mentioned problem. It is an object of the present invention to provide a busy ring tone transmitting circuit in which a busy ring tone is transmitted only to a cordless telephone but not to an outside line. .

[0007]

In order to solve the above-mentioned problems, the present invention provides a sound source of a busy ring tone in a connection device,
When an incoming call to the outside line occurs, it is determined whether there is a vacant connection device in the main device. If there is no vacant connection device, information indicating this is sent from the main device to the connection device. In this publication, the sound source is connected to a transmission unit for forming a wireless line so that a busy ringtone is transmitted only to the cordless telephone.

[0008]

The sound source is a communication path to which the transmission unit is connected, that is, a transmission voice communication path (a transmission apparatus viewed from the connection device side) in a portion where the communication path is separated into a transmission voice communication path and a reception voice communication path. Since the caller is connected to the talker, the busy ringtone is transmitted only to the cordless telephone, not to the outside line.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram, FIG. 2 is a sequence diagram, FIG.
FIG. 3A is a flowchart showing control by the control unit in the main device, and FIG. 3B is a flowchart showing control by the control unit in the connection device.

As shown in FIG. 1, a cordless button telephone system includes one main unit (ME) 1, one or more connecting units (CE) 21 to 2m, and one or more cordless telephones (CE). RTEL) 31 to 3n, the main device 1 accommodates a plurality of external lines 41 to 4p, and the main device 1 and each of the connection devices 21 to 2m are connected to a wired line 51 to 2m.
5m, and the connection devices 21 to 2m and the cordless telephones 31 to 3n are connected to wireless lines 61 to 6m.

Main device 1 includes external line interfaces 111 to 11p for controlling connection to external lines 41 to 4p, connecting device interfaces 121 to 12m for controlling connection to connecting devices 21 to 2m, and external line interfaces 111 to 11p.
A communication path switch 103 for selectively setting a communication path between the communication path 1p and the connection device interfaces 121 to 12m;
The control unit 104 mainly includes the PU 141 and controls the main device 1 collectively. The control unit 104 stores the state (in use state or empty state) of the connection devices 21 to 2m according to the present invention. It has a state identification memory 142 that performs the operation.

Each of the connecting devices 21 to 2m has the same configuration, and includes a main device interface 201 for controlling connection with the main device 1, a busy tone sound source 202, and a two- or four-line communication channel. Hybrid 203 for performing conversion, transmitting section 204 and receiving section 205 for forming a wireless channel
And a switch unit 261 having a switch 261 for controlling the opening and closing of a communication path and a switch 262 for controlling the opening and closing of a connection path between the sound source 202 and the transmitting unit 204 in the present invention.
, An antenna 207 and a CPU 281, and a control unit 208 which collectively controls the connection devices 21 to 2 m.

The cordless telephones 31 to 3n are cordless telephones of the so-called key telephone type, and all have the same configuration. The cordless telephones 31 to 3n have the same configuration as in the related art and will not be described in detail. The symbol of the antenna is “301”.

Next, the operation of the embodiment will be described with reference to FIGS.

The control of the communication channel by the control channel when an incoming call occurs on the outside lines 41 to 4p or when the call is made by the cordless telephones 31 to 3n is the same as the conventional one. The description of the control is omitted.

Now, it is assumed that all of the connection devices 21 to 2m have wireless lines set up with any of the cordless telephones 31 to 3n, and are all in use. In the above state, it is assumed that the cordless telephone 31 is in a call with the outside line 41. In this state, the outside line interface 111 and the connection device interface 121 are connected by the communication path switch 103 in the main device 1, the switch 261 of the switch unit 206 is closed in the connection device 21, and the connection A wireless line (communication channel) between the device 21 and the cordless telephone 31
61, the outside line 41, the outside line interface 111, the communication path switch 103, the connection device interface 121, the wired line 51, the main device interface 201, the switch unit 206 (switch 261), the hybrid 203, and the transmission unit 204. 2 (a), (b), and (c) in FIG. 2 along the route of "unit 205-antenna 207-wireless line 61-antenna 301-cordless telephone 31".
As shown in FIG. 1, a call voice is transmitted and received among the outside line 41, the main device 1, the connection device 21, and the cordless telephone 31. Further, the status identification memory 142 of the control unit 104 of the main device 1 stores that all the connection devices 21 to 2m are in use.

In the above state, when an incoming call occurs on the outside line 42, for example, as shown in FIG.
Then, the control unit 104 detects the incoming call via the external line interface 112 (step S1 in FIG. 3A), and refers to the state identification memory 142 (step S2 in FIG. 3A) to connect devices 21 to 21. It is determined whether or not any of the 21 m is empty (step S3 in FIG. 3A).

If any of the connection devices 21 to 2m is vacant, the control unit 104 sends an incoming call signal to the vacant connection device via the corresponding connection device interface (FIG. 3 ( In step S4) of A), the vacant connection device performs a known communication channel setting control with the vacant one of the cordless telephones 31 to 3n in response to the incoming call signal. Since 2m are in use, the control unit 104 sends a busy ringtone transmission command signal to all the connecting devices 21 to 2m via the connecting device interfaces 121 to 12m and the control lines of the wired lines 51 to 5m ( Step S5 in FIG. 3A). That is,
As shown for connection device 21 in FIG. 2 (e), busy ringtone transmission command signal is transmitted from main device 1 to all connection devices 21 to 2m.

In the connection devices 21 to 2 m, the busy ring tone transmission command signal from the main device 1 is transmitted to the main device interface 2.
When the control unit 208 receives the signal from the control unit 208 via the control unit 01 (step S11 in FIG. 3B), the control unit 208 activates the sound source 202, controls the switch 206, and
2 is closed (step S12 in FIG. 3B). Thereby, the sound source 202 and the transmission unit 204 are connected, and the sound source 20
2 is applied to the transmitting unit 204 and is superimposed on the transmitted voice (voice transmitted when viewed from the connection devices 21 to 2m side), and the cordless telephone 3 shown in FIG.
As shown in 1, the wireless lines 61 to 6m are set up between the connecting devices 21 to 2m, and are transmitted to all the cordless telephones during a call via this.

The busy ring tone output from the sound source 202 is
Since the signal is applied to the transmission voice transmission path on the 4-wire communication path side of the hybrid 203, it does not go around to the bidirectional voice transmission path on the 2-wire communication path side via the switch 261. No busy ringtone is sent. That is, as shown in (f) to (i) of FIG. 2 for the outside line 41, the main device 1, the connecting device 21, and the cordless telephone 31, the connecting devices 21 to 21 already in a call are used.
2m and cordless telephone (31 to 3n, connecting device 21
２2 m and the one during a call), a call ringing tone is transmitted from the connection devices 21 to 2 m while being superimposed on the call voice, together with the transmission and reception of the call voice, and the main device 1 and the connection devices 21 to 2 m
And between the outside line (out of the lines 41 to 4p, which is in a call) and the main apparatus 1, only the transmission and reception of the call voice is performed.

When all of the connecting devices 21 to 2m are in use and any one of the connecting devices is under control of the setting of the communication channel by the control channel, the setting of the communication channel for the connecting device is performed. After the completion, the transmission control of the busy ringtone is performed. When there is a call between the cordless telephones, a busy ringtone is transmitted to both cordless telephones performing the call. The operation of sending a busy ring tone to two cordless telephones during an intercommunication is performed when the intercommunication route is “cordless telephone (eg, 31) -wireless line (eg, 61) -connecting device (eg, 21) -wired line (eg, 51)”. ) -Main device 1 (for example, connecting device interface 12
1, 122 are connected) -wired line (for example, 52)
-Connection device (for example, 22)-Wireless line (for example, 62)-
It can be easily understood from being formed like a cordless telephone (for example, 32).

[0022]

As described above, according to the present invention, the sound source of the busy ring tone is provided in the connection device, and the busy ring tone is applied to the transmission voice path of the 4-wire communication path. And
Since the busy ring tone is transmitted only to the cordless telephone and not to the outside line, there is an effect that the outside line side subscriber during the call is not confused by an unnecessary signal tone.

[Brief description of the drawings]

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

FIG. 2 is a sequence diagram of the embodiment of the present invention.

FIG. 3A is a flowchart illustrating control in a main device control unit. 6B is a flowchart illustrating control in the connection device control unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main apparatus 21-2m ... Connection apparatus 31-3n ... Cordless telephone 41-4p ... Outside line 51-5m ... Wire line 61-6m ... Wireless line 104 ... Control part 142 ... State identification memory 202 ... Sound source 204 ... Transmission part 205 ... Reception unit 206 ... Switch units 261, 262 ... Switch 208 ... Control unit

Continued on the front page (72) Inventor Koji Okamoto 2-57 Koishikawa, Bunkyo-ku, Tokyo Meisei Electric Co., Ltd. (72) Inventor Takayuki Kato 2-57 Koishikawa, Bunkyo-ku, Tokyo Meisei Electric Co., Ltd. (56) References JP-A-63-114326 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04B 7/24-7/26 H04M 3/42 H04Q 3/58 -3/62 H04Q 7/00-7/38

Claims (1)

(57) [Claims] 1. A main device, a connection device, and a cordless telephone, a plurality of external lines are accommodated in the main device, and the main device and the connection device are wireless, and the connection device and the cordless telephone are wireless. In a cordless button telephone system that is connected to each other by a line, the main device has a connection device status identification memory for identifying an idle or busy status of the connection device, and the connection device has a busy ring tone. A sound source, provided on a connection path between the sound source and the transmission unit of the wireless line, and when an incoming call to an outside line occurs, information on all connected devices in use is received from the main device based on information stored in the connected device state identification memory. It has a switch which is controlled to close when it is sent, the by the switch is closed
The busy ringtone transmitted from the sound source
A busy ring tone transmitting circuit of a cordless button telephone system, which is transmitted so as to be superimposed on voice transmitted to a telephone .