JPH03198539A - Cordless telephone set - Google Patents

Abstract

PURPOSE:To release the holding with a handset and to restart talking by devising the telephone set such that the handset is brought into the holding state when a base unit holds the talking. CONSTITUTION:When a hold key 232 is depressed during talking from a base unit 2, a command signal CMND whose control code CTRL represents a hold request is generated and the signal CMND is sent to a handset 1. The handset 1 uses control signals TCTL, RCTL to mute a transmission circuit 110 and a reception circuit 120 and an LED 161 is lighted to set the holding mode. When a talk key 132 or a hold key 133 of the handset 1 is depressed, a command signal CMND whose control code CTRL represents release of holding is generated and the signal CMND is sent to the base unit 2 to release the holding of the handset 1.

Description

[Detailed description of the invention]

The explanation will be given in the following order. A Industrial field of application B Overview of the invention C Prior art D Problem to be solved by the invention E Means for solving the problem (Fig. 1) F Effect G Embodiment G+ First embodiment (Fig. 1) -FIG. 5) G2 Other Embodiments H Effects of the Invention A Industrial Field of Application This invention relates to cordless telephones. Summary of the Invention The second invention is a cordless telephone in which, when the base unit remains in the standby state for a predetermined period of time, the handset is returned to the standby state by executing a predetermined process. It is. C. Prior Art In America, 10 duplex channels, 1st channel to 10th channel, are prepared for cordless telephones, but no control channel is provided. Also, even in Japan, weak type cordless telephones do not have a control channel. Therefore, in these cordless telephones that do not have a control channel, a method as shown in FIG. 9 is used to suppress battery consumption of the handset. In other words, since the base unit (parent unit) operates on commercial AC power, during standby, channels 1 to 10
The channels are sequentially monitored for reception, and this reception monitoring is constantly repeated to wait for a connection request from the handset. At this time, the time required to detect a connection request from a handset is 120 times per channel.
The scanning time is approximately m seconds, and therefore all channels are repeatedly scanned at a period of approximately 1.2 seconds. In addition, during standby, the handset monitors the reception of, for example, the third channel and the seventh channel to check for a connection request from the base unit, and if there is no connection request, then enters sleep mode for, for example, 3.5 seconds.
This action is repeated. Therefore, during standby, the handset is in sleep mode for most of the time, thereby reducing battery consumption. Next, the configuration and operation of such a cordless telephone will be specifically explained. It is assumed that the channels that the handset monitors for reception during standby are the third channel and the seventh channel. In FIG. 4, (1) is a handset, (2) is a base unit, and (3) is a telephone line (external line). In the handset (1), (110) is its transmitting circuit, (120) is its receiving circuit, and the transmitting circuit (
110) is the audio signal St and the command signal CMND (
The receiving circuit (120) receives the down channel FM signal Sd and demodulates the audio signal Sr and command signal CMNO. It is. Furthermore, in the receiving circuit (120), for example, by detecting limiter noise generated by an intermediate frequency amplifier,
Detection signal 5 indicating the presence or absence of the downlink channel FM signal Sd
QLC is also taken out. In addition, in the handset (1), (131) is a dial key, (132) is a talk key, and this talk key (132) is a non-lock type button switch, and each time this key (132) is pressed, the handset (
1) alternately switches between standby mode and talk mode. When the handset (1) is in standby mode, the handset (1) is waiting for a call from the handset (1) and is also connected to two of the downlink channels, in this case, as shown in FIG. The third channel and the seventh channel are intermittently monitored for reception and are waiting for a connection request from the base unit (2). Furthermore, in the talk mode, continuous reception and transmission are performed with the base unit (2). Furthermore, (133) to (137) are auxiliary keys such as hold keys configured with non-locking type bush switches, (139) is a ringer speaker, (1-40)
is a microcomputer for system control. In this microcomputer (140), the command signal CMNO transmitted by the transmitting circuit (110) is formed, and the command signal CMND and detection signal 5QLC taken out from the receiving circuit (120) are determined. The microcomputer (140) also generates control signals TCTL and RCTL for permitting or prohibiting transmission and reception of the transmitting circuit (110) and the receiving circuit (12), specifying channels, muting, and the like. Also, (141) and (142) are memories, and the memory (141) and (142) are memories.
41) is considered to be a ROM, and this ROM (141) has the following information:
A 25-bit system identification code 5YI to distinguish this cordless telephone from other cordless telephones.
D is memorized. Furthermore, the memory (142)
This RAM M (142) contains the channels that the handset (1) monitors for reception during standby,
In the present case, channel data CHDT indicating the third channel and the seventh channel is stored. In addition, (151) indicates a battery for power supply, and this battery (151)
51) is a rechargeable battery such as a nickel-cadmium type battery, and its output voltage is supplied to each part of the handset (1) as its operating voltage. On the other hand, the base unit (2) has a transmitting circuit (210) and a receiving circuit (220) similar to the transmitting circuit (110) and receiving circuit (120) in the handset (1), and the receiving circuit (220) includes: When in standby mode, it is waiting for an incoming call from the telephone line (3), and
As shown in FIG. 9, it scans and receives all uplink channels and waits for a connection request from the handset (1). Furthermore, in the talk mode, continuous reception and transmission are performed with the handset (1). Further, in the base unit (2), (211) is a transmitter, (221) is a receiver, (231) is a dial key (232) is a switch for a hook switch, and (233) is a dial key (232) for a hook switch.
) to (237) are auxiliary keys such as hold keys constituted by normally open switches, and (239) is a ringer speaker. Further, (240) is a microcomputer for system control, and this microcomputer (240) performs the same processing as the microcomputer (140) in the handset (1), and also manages the overall operation of this cordless telephone. be. Furthermore, (241), (242)
is a memory, which corresponds to memories (141) and (142).The system identification code 5YID is written in the ROM (241), and the data that the handset (1) monitors for reception is written in the RAM (242). The data CHDT of the current channel is stored. Furthermore, (261) is a 4-wire/2-wire conversion circuit, (262)
(263) is a dial tone signal (DTMF signal) forming circuit; (264) is a ring tone signal detection circuit. FIG. 5 shows an example of the signal format of the command signal CMNO, and this signal C? lND has a 24-bit bit synchronization signal BSYN at the beginning, followed by a 16-bit frame synchronization signal FSYN. In this case, these signals BSYN, FSYN are, for example, BSYN-“1
01010......lO゛. PSYN="'1100010011010110"
...FSYN for upstream channel-“'1001001100110110’”
. . . has a specific bit pattern indicated for the downstream channel. Furthermore, the command signal CMNO includes, following the signal FSYN, a 25-bit system identification code 5YID and a 12-bit error correction code FC for this code 5YID.
C and a 3-bit dummy bit DBIT in this order, and a 5-byte control code CTRL following the dummy bit DBIT. In this case, the control code CTRL is its first byte CT
LI is a handset (1) and a base unit (2)
CTL2
~5th bye I-CTL5 is the parameter or data related to the 1st pie) CTLI. Then, either the handset (1) or the base unit (
2) receives this command signal CMND, the microcomputer (140) or (240) converts the identification code 5YID included in the signal CMND into the identification code stored in its own ROM (141) or (241). 5YID is checked, and only when they match, the command signal CMND is made valid, and when they do not match, it is made invalid.

[On standby]

During standby, the operations shown in the upper part of FIG. 6 (and FIG. 9) are performed. That is, in FIG. 6, the solid vertical line indicates the state of the handset (1) and the base unit (2). The vertical direction of this solid line is the time axis direction, but for convenience of drawing, this time axis is not linear. Further, when this solid line is a single line, it is the sleeve mode, when it is a double line, only reception is permitted, and the hatched period indicates that transmission is also permitted. In the handset (1), the RAM (14
2) The reception of the third and seventh down channels is alternately and intermittently monitored in accordance with the channel data CHDT stored in . Furthermore, in the base unit (2), all uplink channels are repeatedly scanned and received.

[Call from handset]

A call from the handset (1) to an outside line is performed, for example, as shown in the connection sequence shown in the lower part of FIG. That is, when the handset (1) is in standby mode, when its talk key (132) is pressed, this is detected by the microcomputer (140), and thereby the receiving circuit (120) stores the data in the RAM (142). Reception is performed on the third downstream channel or the seventh channel indicated by the channel data CHDT, and if either channel, for example, the third channel, is vacant, the reception channel of the receiving circuit (120) is set to the third downstream channel. Fixed and continuous reception is allowed. Furthermore, the transmission of the transmitting circuit (110) is also permitted on the third upstream channel. The handset (1) is therefore in talk mode on the third channel. Subsequently, a command signal CMND whose control code CTRL indicates a call request is sent from the microcomputer (140) to the transmission circuit (
In the transmission circuit (110), the signal CMNO is converted into an FM signal Su of the third upstream channel, and this signal Su is transmitted to the base unit (2) through the antenna (100). Then, in the base unit (2), the antenna (2
The signal (radio wave) Su is received by the receiving circuit (220), but since the receiving circuit (220) repeatedly scans all uplink channels, when the receiving channel becomes the third channel, the signal (radio wave) Su is received by the receiving circuit (220). Detection signal 5Q
LC is obtained. Then, the scanning of the receiving circuit (220) is stopped on this third channel, and then the receiving circuit (220) is stopped.
220), the command signal CMN is output from the FM signal Su.
D is demodulated and this signal CMND is sent to the microcomputer (240)
Identification code 5YI supplied to CMNO and included in signal CMNO
D is ROM (241) (7) Identification: l-)'5Y
It is checked whether it matches the ID. In this case, since they match and the control code CTRL included in the signal CMND indicates a call request, the microcomputer (240) causes the transmission circuit (210) to select the channel on which the FM signal Su has been received. In this case, transmission is permitted on the third downlink channel. Therefore, the base unit (2) also enters the talk mode on the third channel. Subsequently, a command signal CMNO in response to the call request is issued.
F, 7 A: 27 (240) to transmitting circuit (210)
In the transmitting circuit (210), the signal CMN
D is converted to the FM signal Sd of the third downstream channel,
This signal Sd is transmitted to the handset (1) through the antenna (200). In the handset (1), the FM signal Sd is transmitted from the base unit (2) through the third down channel.
When this is transmitted, it is received by the antenna (100) and supplied to the receiving circuit (120).
A command signal CMND is taken out from the microcomputer (120) and supplied to the microcomputer (140). Then, the identification code 5YID included in the command signal CMNO matches the identification code 5YID stored in the ROM (141), and the control code CTRL included in the signal CMND indicates a response to the call request. Therefore, the transmitting circuit (110) and the receiving circuit (120) are set to the talk mode in the third channel. Therefore, the handset (1) and the base unit (2)
) is now connected through the third channel. Furthermore, in the base unit (2), the switch circuit (262) is placed in an off-hook state and the transmitting circuit (21
0) and a receiving circuit (220) are connected to the line (3) through a conversion circuit (261) and a switch circuit (262). Therefore, the handset (1) has a base unit (
This means that it is connected to line (3) through line (2).

[Dial and call]

Subsequently, when the caller inputs the telephone number of the other party using the dial key (131) of the handset (1), a command signal CMND indicating that the control code CTRL is to send a telephone number and the telephone number is generated. , this signal CMNO is converted into an upstream FM signal Su and transmitted. Therefore, in the base unit (2), the command signal CMND is obtained from the receiving circuit (220), and the control code CTRL of this signal CMND indicates that a telephone number is to be sent and indicates the telephone number. The formation circuit (263) is controlled by the microcomputer (240) according to the telephone number to form a dial tone signal corresponding to the telephone number sent from the handset (1), and this signal is sent to the conversion circuit (261). Through
Furthermore, the telephone line (3) is connected through the switch circuit (262).
be sent to. When the other party answers the phone, the voice signal Sr from the other party is sent to the transmission circuit (210) through the signal line of line (3) → switch circuit (262) → conversion circuit <261).
is supplied to Therefore, the signal Sr is converted into a downstream FM signal Sd, and this signal Sd is sent to the antenna (200).
Sent from. Then, this signal Sd is received by the handset (1), a voice signal Sr is taken out from the receiving circuit (120), and this signal Sr is supplied to the receiver (121). Also, when transmitting a call, the audio signal S from the transmitter (111)
t is supplied to the transmitting circuit (110) and the upstream FM signal S
This signal Su is transmitted from the antenna (100) to the base unit (2). Then, the signal Su is received by the base unit (2) and the signal St is taken out from the receiving circuit (220), and this signal St is supplied to the line (3) through the conversion circuit (261) and the switch circuit (262). and is sent to the other party's phone.

[Closing on handset]

When the call ends, for example, as shown in FIG. 7, when the talk key (132) of the handset (1) is pressed, the control code CTRL is a command signal C indicating that the call is over.
MND is formed and this signal CMND is transmitted to the base unit (2) by the upstream FM signal Su. Then, the command signal CMND is taken out from the receiving circuit (220) of the base unit (2), and the microcomputer (240) determines that the call is over. As a result, the transmitting circuit (210) is prohibited from transmitting, and the receiving circuit (220) is placed in a standby mode, in which it repeatedly scans all upstream channels. Further, the switch circuit (262) is also placed in an on-hook state. Further, in the handset (1) as well, after transmitting the command signal CMND indicating the end of the call, the transmitting circuit (110) is prohibited from transmitting, and the receiving circuit (120) is again transmitted to the third and seventh downstream channels. This is a standby mode in which the data is received alternately and intermittently.

[Incoming call on handset]

An incoming call from an outside line to the handset (1) is performed, for example, as shown in the connection sequence shown in FIG. In other words, when a call comes through line (3),
The ring tone signal is detected by the detection circuit (264), and this detection signal is supplied to the microcomputer (240). Then, this causes the receiving circuit (220) to
Channel data CH stored in (242)
Reception is performed on the third or seventh upstream channel indicated by DT, and if either channel, for example, the third channel, is vacant, the reception channel of the receiving circuit (220) is fixed to the third upstream channel. . Furthermore, in the third downstream channel, a transmitting circuit (210)
transmission is also permitted. Therefore, the base unit (2
) goes into talk mode on the third channel. Next, a command signal CMND whose control code CTRL indicates a request for an incoming call is transmitted from the microcomputer (240) to the transmitting circuit (
210), and the signal CMNO is converted into an FM signal Sd of the third downstream channel and transmitted to the handset (1). Then, in the handset (1), the antenna (10
The signal Sd is received by the receiving circuit (1
20) is the channel data C of RAM (142)
According to the HDT, the third and seventh downstream channels are scanned alternately and intermittently, so when the receiving channel becomes the third channel, the detection signal 5QLC is sent from the receiving circuit (120). can get. Then, the receiving circuit (120
) is stopped, and then the receiving circuit (120) demodulates the command signal CMNO from the FM signal Sd, and determines whether the identification code 5YID included in this signal CMND matches the identification code 5YID of the ROM (141). It will be checked. In this case, since they match and the control code CTRL included in the signal CMNO indicates a request for an incoming call, the transmitting circuit (110) sends the FM signal S to the channel on which it was received, in this case, Transmission is permitted on the third upstream channel. Therefore, the handset (1) also goes into talk mode on the third channel. Subsequently, a command signal CMNO in response to the incoming call request is sent.
,/l(,7 icon (140) to transmitter circuit (110)
This signal CMND is converted into the FM signal S of the third upstream channel and transmitted to the base unit (2). In the base unit (2), when the FM signal S is transmitted from the handset (1) through the third upstream channel, the command signal CMND is taken out from the receiving circuit (220) and sent to the microcomputer (240). is supplied to Then, the identification code 5YID included in the command signal CMNO matches the identification code 5YID stored in the ROM (241), and the control code CTRLga included in the signal CMNO indicates a response to the call request. Therefore, the talk mode in the third channel is determined for the transmitting circuit (210) and the receiving circuit (220). Therefore, the handset (1) and the base unit (2)
) is now connected through the third channel. Furthermore, in the handset (1), a microcomputer (1
40) controls the oscillation circuit (138) to form a ringer signal, and this signal is supplied to the speaker (139), which produces a bell sound indicating an incoming call. Then, in the handset (1), when the talk key (132) is pressed, a command signal CMND in response to the call is formed, and the control code CTRL indicates that the talk key (132) has been pressed. Along with being transmitted from the FM signal S trace, the oscillation circuit (138)
is turned off and the ringer is turned off. Then, a command signal C from this handset (1)
Once the MNO is received at the base unit (2),
The switch circuit (262) is placed in an off-footer state. Therefore, the hand cent (1) and the base unit (2
), a communication channel is opened between the caller and the handset (1), and from then on, a communication can be made between the other party and the handset (1).

[Calling, receiving, and ending calls from the base unit] Base unit (2) dial key (231), hook switch (232), handset (211, 221), oscillation circuit (2)
38), a speaker (239) is used to make, receive, and end a call in the same manner as a general telephone. Furthermore, at this time,
No channel is opened for communication with the handset (1). D. Problems to be Solved by the Invention This invention has the advantage that when a call is being made using the base unit (2), the base unit (2) puts the call on hold, and the handset (1) releases the hold and transmits/receives the call. vessel(
111, 121) so that the call can be resumed, and also to prevent wasteful consumption of the battery (151) especially when the call is on hold. E. Means for Solving the Problems Therefore, in the present invention, in the handset (1) and the base unit (2), for example, FIGS.
The process shown in the figure is executed. F Put on hold with the action base unit (2) and set the handset (1).
), the call can be resumed, and the battery (151) is not wasted. G Embodiment G+ First Embodiment The microcomputer (140) is provided with a routine (300) of a flowchart as shown in FIG. 1, for example, and the microcomputer (240) is provided with a routine (300) as shown in FIG. A flowchart routine (400) is provided. Note that FIG. 3 shows a protocol for processing related to suspension, and the numbers on both sides are reference numbers (reference numerals) of steps in routines (300) and (400).

[When talking on the base unit]

When making a call using the base unit (2), the handset (1) is in standby mode and steps (301), (302) of the routine (300) are repeated. That is, in step (301), the handset (1) is in the sleeve state for, for example, 3.5 seconds, and then, in step (302), the FM signal Sd from the base unit (2) is switched to the third channel or It is checked whether reception is possible on the seventh channel, and if reception is not possible, the process returns from step (302) to step (301). The handset (1) is thus in standby mode due to steps (301), (302) as explained in FIG. Further, when a processing request is made to the handset (1), for example, when the talk key (132) is pressed, the processing of the microcomputer (140) proceeds from step (301) to step (303), and this step ( 303)
In step (303), the requested process is executed, and then the process of the microcomputer (140) returns from step (303) to step (301). Furthermore, when the base unit (2) is used to make a phone call, steps (401) and (402) of the routine (400) are repeated in the base unit (2). That is, in step (401),
By looking at the output of the switch (232), the handset (
211, 221) is on-hook, but if it is not on-hook, the process proceeds from step (401) to step (402), and in this step (402), the hold key (233) is pressed. If it is not pressed, the process returns from step (402) to step (401). During the call, steps (401) and (40
2), the on-footer and hold key (232) of the handset (211, 221) are constantly checked. After the call, when the handset (211, 221) is on-hook, this is detected in step (401), and the process proceeds from step (401) to step (403).
In this step (403), the call termination process is performed as explained in FIG. 7.

[Hold on base unit]

Hold key (232) during a call from base unit (2)
) is pressed, this is detected in step (402) and the process moves from step (402) to step (41).
Proceeding to step 1), in this step (411) a command signal CMNO whose control code CTRL indicates a pending request is formed, this signal CMND is sent to the handset (1), and the process proceeds to step (412). Then, the FM signal Sd based on the command signal CMND in step (411) is detected in step (302), and the process goes from step (302) to step (311).
In this step (311), the sent command signal CMND is changed to the pending command signal CMND.
is checked, and pending command signal C
In the case of MND, the process proceeds from step (311) to step (312), and in this step (312), a command signal CMND whose control code CTRL indicates a pending response is formed, and this signal CMNO is sent to the base unit (2). is transmitted, and the process proceeds to step (313). Then, in step (412), step (31
When the command signal CMND for the pending response in step 2) is received, the process proceeds from step (412) to step (41).
Proceeding to step 3), in this step (413) a command signal CMND with control code CTRL indicating hold transition is formed, this signal CMNO is sent to the handset (1), and then in step (414) the control signal CMND is formed. Muting is applied to the transmitting circuit (210) and the receiving circuit (220) by TCTL and RCTL, and the base unit (2) enters a hold state. When the base unit (2) enters the hold state, the process continues to step (421), and thereafter, this step (421), steps (422), and (424) are repeated. That is, in step (421), the control code C
It is checked whether the command signal CMNO indicating release of the TRL hold is received. If not, the process proceeds from step (421) to step (422), in which the hold key (2) is checked.
33) is pressed, and if it is not pressed, the process proceeds from step (422) to step (423), and in this step (423),
By looking at the detection signal 5QLC, the handset (1
) is being received, and if so, the process proceeds to step (
423) and returns to step (421). Therefore, in the base unit (2), when the hold state is entered, steps (421) to (423) are repeated, and the instruction to release the hold (step (421)) and the state of the hold key (233) (step (421)) are repeated. 422)), FM
The presence or absence of the signal Su (step (423)) is monitored. Note that in step (412), when the command signal CMNO of the hold response is not received, the process proceeds from step (412) to step (415), and in this step (415), after step (411) is executed, a predetermined It is checked whether a period of time, for example several seconds, has elapsed, and if not, the process returns from step (415) to step (412). Therefore, until the command signal CMND of the pending response in step (312) is received, or until the command signal CMND of the pending response in step (312) is received, or
Step (412) is repeated until timeout occurs in step 15). Note that when a timeout occurs in step (415), the process repeats from step (415) to step (4).
13), and thereafter enters the hold state. In this case, in the base unit (2), the hold key (233) is pressed.
) is pressed and the handset (1) receives the command signal CMND for the hold request, so there is no problem. On the other hand, in the handset (1), step (31
In step 3), it is checked whether the command signal CMND for transition to hold in step (413) has been received;
When received, the process proceeds from step (313) to step (314), and in this step (314), the transmitting circuit (1
10) and the receiving circuit (120) are muted, the LED (161) is turned on, and the hand sent (1) also enters a hold state. When the handset (1) enters the hold state, the process continues to step (321), after which step (321) and steps (322) to (324) are repeated. That is, in step (321), the talk key
It is checked whether the hold key (132) or the hold key (133) has been pressed, and if neither has been pressed, the process proceeds from step (321) to step (322), and in this step (322), the control code C
It is checked whether a command signal CMND instructing the TRL to enter standby mode has been received. Then, when no such signal CMND is received, the process continues from step (322) to step (323).
In this step (323), the control code CTRL is a command signal C instructing to change the channel.
It is checked whether the MND has been received, and if not, the process proceeds from step (323) to step (324), in which step (324)
It is checked whether a predetermined period of time, for example 4 minutes, has elapsed since step (314) was executed and the process entered the hold state, and if not, the process proceeds to step (32).
4) returns to step (321). Therefore, in handset (1), once it enters the hold state, it does not perform step (321) until 4 minutes have elapsed.
- (324) are repeated, and the state of the talk key (132) and the hold key (133) (step (321)), the instruction to transition to standby mode (step (322))
) A channel change instruction (step (323)) is monitored. Note that in step (311), the command signal CM
When NO is other than the command signal CMND for a hold request, the process proceeds from step (311) to step (315), in this step (315), the process corresponding to the sent command signal CMND is performed, and then, The process returns to step (301). Further, in step (313), when the command signal CMNO for hold transition is not received, the process proceeds from step (313) to step (316), and in this step (316), after step (311) is executed, a predetermined It is checked whether a period of time, for example several seconds, has elapsed, and if not, the process returns from step (316) to step (312). Therefore, until the command signal CMND for pending transition in step (413) is received, or until step (3)
The reception of the hold response command signal CMND is repeated until the timeout occurs in step 16). Then, in step (316), when the timeout occurs, the process is performed from step (316) to step (
314) and enters the hold state, but in this case, the hold key (233) is pressed in the base unit (2), and the command signal CMNO of the hold request is received in the handset (1). It's later, so there's no problem.

[Release hold from handset]

When a call is being made using the base unit (2), the base unit (2) goes on hold as described above, the handset (1) releases the hold, and the handset (111, 121) ), the call is resumed. That is, when in the hold state as described above, the talk key (132) or the hold key (
133), this is detected in step (321) and the process moves from step (321) to step (3).
31), and in this step (331), the control code CTRL is a command signal CMN indicating release of hold.
D is formed, and this signal CMND is transmitted to the base unit (2
), and the process then proceeds to step (332). Then, the command signal CMNO goes to step (421
), the process proceeds from step (421) to step (431), and in this step (431), a command signal CMNO in which the control code CTRL indicates a response to release from hold is formed, and this signal CMNO is transmitted to the handset (1). ) and then step (432)
Proceed to. Further, in the handset (1), step (33
2), the command signal CMND for release from hold in step (431) is received, and then in step (333), a command signal CMND whose control code CTRL indicates execution of release from hold is formed, and this signal CMND is sent to the base unit. (2) and then step (33
In step 4), the muting of the transmitting circuit (110) and the receiving circuit (120) is canceled by the control signals TCTL and RCTL, the LED (161) is turned off, and the hold of the handset (1) is canceled. . Therefore, from now on, the handset (1) is in the state for talking. Furthermore, in the base unit (2), the step (
In step 432), it is checked whether the command signal CMND for executing the hold release in steps (3, 33) has been received, and when it has been received, the process returns to step (432).
32) to step (433), and this step (
433), the muting of the transmitting circuit (210) and the receiving circuit (220) is canceled by the control signals TCTL and RCTL, and the suspension of the base unit (2) is canceled. Therefore, from now on, the base unit (2) will also be in the state for talking. Therefore, from the handset (1) to the base unit (
2) You can resume the call. Note that in step (432), step (333
) is not received, the process proceeds from step (432) to step (434), and in this step (432),
It is checked whether a predetermined period of time, for example several seconds, has elapsed since the step (431) was first executed, and if not, the process returns from step (434) to step (431). Therefore, the transmission of the hold release response (step (431)) and the reception of the hold release execution request (step (432)) are repeated until the timeout occurs. Then, in step (434), when the timeout occurs, the process is performed from step (434) to step (
433), and the hold is released. In this case, step (432) is ignored due to timeout and the call is resumed; however, on the handset (1), pressing the talk key (132) or the hold key (133) instructs to release the hold. death,
In addition, in the base unit (2), step (4)
Since the command signal CMND for canceling the hold is received in step 21), there is no problem even if the process proceeds from step (434) to step (433) when the timeout occurs.

[Resuming a call from the base unit]

This means that when a call is being made using the base unit (2), the base unit (2) goes on hold as described above, the base unit (2) releases the hold, and the handset (211, 221), the call is resumed. That is, when in the hold state, the base unit (2)
If you press the hold key (233), this will move to step (42).
2), the process proceeds from step (422) to step (441), and in this step (441), the control code CTRL forms a command signal CMND instructing transition to standby mode, and this signal CMNO to the handset (1) and processing then proceeds to step (442). Then, in the handset (1), this command signal CMND is detected in step (322), so the process goes from step (322) to step (341).
), and in this step (341), a command signal CMND whose control code CTRL indicates a response to transition to standby mode is formed, this signal CMND is sent to the base unit (2), and the process continues with step (341).
Proceed to step 42). Then, in step (442), step (34
1) Command signal CMN for transition to standby mode
A check is made to see if an
Proceeding to step 3), in this step (443) a command signal CMND is formed whose control code CTRL indicates transition to standby mode, this signal CMND is sent to the handset (1), after which the process continues with step (443).
490), and in this step (490), the transmitting circuit (210) is controlled by the control signals TCTL and RCTL.
Transmission/reception of the receiving circuit (220) is prohibited, and the handset/receiver (211, 221) is connected to the line (3) through the conversion circuit (261) and switch circuit (262). Therefore, from now on, the call can be resumed using the handset (211, 221). Also, at this time, in step (342), handset (1) checks whether the command signal CMND indicating transition to standby mode in step (443) has been received, and when received,
The process returns from step (342) to step (301), after which the handset (1) enters standby mode. Note that in step (442), step (341
) command signal CMNO for transition to standby mode
is not received, processing continues at step (442
) to step (444), and this step (44
In step 4), it is checked whether a predetermined period of time, for example several seconds, has elapsed since step (441) was first executed, and if not, the process returns to step (441).
444) returns to step (441), and when the process has passed, the process returns from step (444) to step (490).
). Therefore, in step (442), step (
341) command signal C for transition to standby mode.
When the MN port is not received, the instruction to transition to standby mode in step (441') and the reception of the response in step (442) are repeated until a timeout occurs. However, when the timeout occurs, the handset (211,
221) is off-hook, so in order to deal with this, the handset (211, 221) is connected in step (490) regardless of the results of steps (441) and (442).
) calls are possible. Further, in step (342), step (443
) command signal CMND for transition to standby mode
is not received, processing proceeds from step (342) to step (343). And this step (
At step 343), it is checked whether a predetermined period of time, for example, several seconds, has elapsed since step (341) was executed; if not, the process returns to step (343).
343) returns to step (342), and when the process has passed, the process returns from step (343) to step (301).
). Therefore, after transmitting the command signal CMND in response to transition to standby mode in step (341), the reception of the command signal CMND in response to transition to standby mode in step (443) is waited for several seconds. If the command signal CMND cannot be received even after waiting, the standby mode is entered from step (301). In this case, the handset (1) performs step (332)
, (341), the instruction to transition to standby mode is received and responded to, so step (343)
There is no problem even if the process proceeds from step (301). In this way, even if the handset (1) goes on hold, the base unit (2) can release the hold and resume the call. At this time, the hold of the handset (1) is released and the handset (1) is placed in standby mode.

[Interruption of upstream FM signal Su]

This may occur if you move the handset (1) while the handset is on hold and the status of the radio waves (FM signal Su) that the base unit (2) had been receiving changes suddenly and becomes unreceivable. It is. That is, in the base unit (2), the FM signal Su
When the detection signal 5QLC becomes unreceivable, the detection signal 5QLC changes, and this change is detected in step (423), and the process goes from step (423) to step (451).
). In this step (451), the control code CTRL is a command signal CMN indicating channel change.
O is formed, and this signal CMND is transmitted to the handset (1)
and then in step (454) the channel is changed to the next available channel. Further, in the handset (1), step (32
3), the channel change command signal CMND of step (451) is detected, and the process returns to step (3).
23) to step (351), and this step (
In step (351) one of the free channels is searched for and selected, and then in step (352) a command signal CMNO is formed whose control code CTRL indicates a connection request for reservation, and this signal CMND is ), and then the process proceeds to step (353). Furthermore, in the base unit (2), the step (
452) to (455) are repeated. That is, in step (453), it is checked whether or not the command signal CMNO for the pending connection request in step (352) has been received. If not, the process proceeds from step (453) to step (454), and this step ( At step 454), it is checked whether the command signal CMND requesting a call from the handset (1) is received, and if not, the process proceeds to step (
454), the process proceeds to step (455), and in this step (455), it is checked whether the hold key (233) has been pressed, and if it has not been pressed, the process returns from step (455) to step (452). . Then, when the command signal CMND for the pending connection request in step (352) is received, this is transmitted in step (453).
), the process proceeds from step (453) to step (456), and in this step (456),
A command signal CMND is formed, the control code CTRL indicating a response to the pending connection request, and this signal CMND is sent to the handset (1), after which the process continues in step (
Return to 421). Further, when a command signal CMND requesting a call from the handset (1) is received, this step (
If the hold key (233) is pressed, this is detected in step (455) and the process proceeds from step (455) to step (431).
490) (details of these will be described later). Therefore, the base unit (2) is connected to the handset (
When it becomes impossible to receive the FM signal S from 1), step (1) instructs the handset (1) to change the channel.
451)), and then waits for a pending connection request on an empty channel (step (453)). When the request is received, the response is returned (step (456)) and the pending state is continued again. Further, when waiting for a pending connection request on an empty channel (step (453)), a check is made for a call request from the handset (1) (step (454)) and an off-hook state of the handset (211, 221). A check (step (455)) is also performed. Further, in the handset (1), step (35
3), it is checked whether a command signal CMND indicating a response to the pending connection request in step (454) has been received, and if so, the process returns to step (454).
353) returns to step (321). Furthermore, in step (353), step (45
4) Command signal CMND indicating a response to the pending connection request
is not received, processing proceeds from step (353) to step (354);
In step (314), it is checked whether a predetermined period of time, for example, 4 minutes has elapsed since entering the hold state, and if not, the process moves from step (354) to step (351). return. Therefore, the handset (1) has a base unit (
When the channel change command signal CMND is received from step 2), if it has been less than 4 minutes since the channel was placed on hold, it searches for an empty channel (step (351) '') and requests a connection for hold. )), after waiting for the response (step (353)), the system enters the hold state again through step (321).However, in step (354), when 4 minutes have elapsed since entering the hold state, Processing is step (354)
Then, the process returns to step (301), and thereafter the standby mode is entered. Therefore, the base unit (2) is connected to the handset (1).
), the handset (1) is instructed to change the channel, but when the channel cannot be connected even after 4 minutes, the handset (1) enters standby mode.

[Pending timeout]

When the handset (1) enters the hold state, steps (321-(324)) are repeated;
When four minutes have elapsed since entering the hold state, this is detected in step (324) and the process returns to step (32).
4) returns to step (301). Therefore, if you are on hold for 4 minutes, the handset (
1) enters standby mode to save battery (151) consumption. Note that at this time, the base unit (2) cannot receive the FM signal SU from the handset (1), so the process proceeds from step (423) to step (45).
1), the process proceeds to a loop of steps (452) to (454). Therefore, after the hold on handset (1) has timed out, the talk key (13
2) to make a call, step (431)
) is executed and the hold is released. Alternatively, by pressing the hold key (233) on the base unit (2),
Step (490) is executed and the hold is released. According to the present invention, processing at the time of holding is performed as described above. In this case, especially according to the present invention, when the base unit (2) puts a call on hold, the handset (1)
) also enters a hold state, so the call can be resumed by canceling the hold using the handset (1). Also, after being put on hold, the FM that the handset (1) is transmitting
The status of the FM signal Sd being received during the signal S changes and the base unit (2) sends a command signal CM to release the hold.
Even if the ND becomes inaccessible, step (324)
), the hold for handset (1) is released, for example, 4 minutes after the handset (1) is put on hold.
) will be put into standby mode, so the battery (151
) will not be wasted unnecessarily. G2 Other Embodiments In the above, the base unit (2) may be provided with a melody sound signal source, and the melody sound signal may be sent to the other party of the call and the handset (1) while the call is on hold. In addition, if the base unit (2) has a microphone and speaker and you can talk to the other party using the microphone and speaker while the handset (211, 221) is on-hook, multiple handsets (1) can be used. If possible, the present invention can also be applied when using a control channel. H Effects of the Invention According to the present invention, processing when a call is on hold is performed as described above. In this case, especially according to the present invention, when a call is put on hold in the base unit (2),
) also enters a hold state, so the call can be resumed by canceling the hold using the handset (1). Also, after being put on hold, the FM that the handset (1) is transmitting
The status of the FM signal Sd being received during the signal S changes and the base unit (2) sends a command signal CM to release the hold.
Even if the ND becomes inaccessible, step (324)
), the hold for handset (1) is released, for example, 4 minutes after the handset (1) is put on hold.
) will be put into standby mode, so the battery (151
) will not be wasted unnecessarily.

[Brief explanation of drawings]

1 and 2 are flowcharts showing an example of the present invention, FIG. 3 is a protocol diagram thereof, FIG. 4 is a system diagram thereof, and FIGS. 5 to 9 are diagrams for explaining the same. (1) is the handset, (2) is the base unit, (1)
10), (210) are transmitting circuits, (120), (220
) is a receiving circuit, and (300) and (400) are processing routines. Figure 2 A: γF in hand F Figure 8

Claims (1)

[Claims] During a call, a channel is opened between the handset and the base unit using radio waves, and the base unit is connected to the line so that a call can be made between the handset and the other party. When a hold operation is performed on the base unit in a cordless telephone that has been installed, the base unit enters the hold state, opens a channel with the handset, and sends a control signal to the handset to put it on hold. and when the handset receives the hold transition control signal,
While entering the hold state, the channel opened between the base unit and the slave unit is monitored for a predetermined period after entering the hold state, and when the predetermined period has elapsed while in the hold state. , the above handset is a cordless telephone that goes into standby mode.