JPH0833048A - Digital cordless telephone set - Google Patents

Abstract

PURPOSE:To enable speech with another slave set without manual operations every time in the case of direct simultaneous interslave set speaking. CONSTITUTION:A control part 12 sets transmission/reception timing in an idle state by setting the number of slave sets to perform speaking by an operation input set with an operation input part 10 in advance and the hand set number of a present station, synchronism is established by exchanging a VOX signal showing a sounded/silent state based on this set transmission/reception timing, and a VOX deciding circuit 4 judges the sounded state and transmits these voice data by setting the idle state after the establishment of synchronism and inputting a voice message to a microphone 1 in such a state. When the voice data are received by each slave set at the VOX reception timing, the control part 12 controls a transmission/reception changeover switch 8 so as to switch it to a receiving part system even at the transmission timing of the present station as well. Thus, the voice data can be received at all times and speaking is enabled between plural slave sets.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital cordless telephone which enables direct simultaneous calls between a plurality of handsets.

[0002]

2. Description of the Related Art Conventionally, a digital cordless telephone has a main unit (PS) connected to an exchange through a telephone line,
It is composed of a plurality of wireless slave units (CS), and as a wireless transmission / reception system between the master unit and the slave units, the TDMA / TDD system (Time
Division Multipie Access / Time Division Duplex)
The standards for such digital cordless telephones have been established at the "Radio System Development Center", and the final draft "RCR STD-2" has been adopted.
8 ”has been approved. And this standard "RCR
STD-28 ”specified by TDMA / TDD
In the method, one frame is composed of a plurality of transmission slots and the same number of reception slots, each reception slot is associated with each transmission slot, and transmission and reception are performed by a combination of the transmission slots and the reception slots. That is, since transmission and reception are temporally separated in the transmission slot and the reception slot, the transmission frequency and the reception frequency can be the same frequency, and a plurality of transmissions and receptions can be performed with one frequency. .

Further, in such a digital cordless telephone, as shown in Japanese Patent Application Laid-Open No. 4-213933, a unidirectional direct simultaneous call between a plurality of handsets without a master unit at a single frequency. In such a digital cordless telephone, a vacant channel is captured based on the unidirectional simultaneous call mode detection signal from the unidirectional simultaneous call mode detection means, and a child channel including information about the call channel is proposed. After the inter-machine direct simultaneous connection request signal is sent directly to the partner slave, a synchronization signal for setting the transmission / reception slot is sent to the partner slave. Then, by setting the communication channel and the transmission / reception slot for the direct simultaneous communication between the unidirectional handset from the information in the partner mobile device, the transmission slot and the reception slot which are different in time are set, and one frequency It becomes a state in which direct simultaneous calls between handset units can be performed at the transmission and reception frequency.

Then, in this state, by turning on the press talk switch provided in each slave unit, the voice message input from the microphone of the slave unit turned on is transmitted to the partner slave unit in a predetermined transmission slot. In the other handset, the voice message input after the press talk switch is turned on is received and emitted from the speaker because it is the reception slot when it is transmitted in the predetermined transmission slot. Therefore, by directing the press talk switch to be turned on / off by shifting the respective handset units in time, it is possible to make a direct call between the handset units among the three or more handset units by this one-way simultaneous call method. Was configured as.

[0005]

However, in the above-mentioned conventional apparatus, in order to actually carry out the direct simultaneous call between the unidirectional slave units, the direct simultaneous call between the slave units can be performed at the transmission / reception frequency of one frequency. When you want to talk on each handset, you have to manually turn on / off the press talk switch, which is troublesome to turn on / off, and the press talk switch is turned on / off. May change the caller by manual operation, so there is a risk that the press talk switch will be turned on at the same time in each handset, and if the press talk switch is turned on at the same time in each handset, interference will occur. There was a problem that I could not make a call after coming to Japan.

[0006] It is an object of the present invention to provide a digital cordless telephone which can talk with other slaves in a direct simultaneous call between slaves without manual operation.

[0007]

In order to achieve the above object, the invention according to claim 1 is composed of a master unit and a plurality of slave units, and calls are made by differently transmitting and receiving. In addition, in a digital cordless telephone that can make direct simultaneous calls between slaves among multiple slaves, set the number of slaves that make direct simultaneous calls between slaves to each slave and set each slave individually. Slave unit number setting means for assigning different slave unit numbers, and transmission / reception timing setting means for setting transmission / reception timing of its own station in an idle state based on the number of slave units and slave unit numbers set by the slave unit number setting means When,
A voice input detection means for detecting the presence / absence of a sound input to a microphone, and a detection signal from the voice input detection means including the cordless handset number of the own station and detecting the cordless handset number of the own station. Detection signal transmitting means for transmitting a signal to another slave unit based on the timing set by the transmission / reception timing setting means, and when the detection signal is received, the received detection signal and the slave unit number included in the detection signal And a synchronization establishing means for synchronizing transmission / reception in a communication state based on the transmission / reception timing set by the transmission / reception timing setting means, and a transmission operation at a transmission timing of its own station after synchronization is established by the synchronization establishing means, At this time, the transmitting means for transmitting the sound input to the microphone to the other handset, and the receiving station of the own station after the synchronization is established by the synchronization establishing means. When the receiving unit shifts to the receiving operation in the communication, and the audio signal is received by the receiving unit, the transmission source slave unit is set based on the reception timing of the audio signal and the transmission / reception timing set by the transmission / reception timing setting unit. Judgment is made, regardless of the transmission timing of the own station in the idle state, while controlling the audio signal transmitting means so that the sound input to the microphone at the transmission timing in the call state of the transmission source slave unit is not transmitted to other slave units. And a control means for controlling the audio signal receiving means so as to shift to the receiving operation.

According to a second aspect of the invention, the control means comprises:
When the transmission timing of the own station in the idle state and the transmission timing of the voice signal transmission source handset in the call state are different, the detection signal including the handset unit number of the own station is transmitted to the other child in the transmission timing of the own station in the idle state. To be sent to the machine.

According to a third aspect of the present invention, each of the slaves is identified by a common identification code, and the synchronization of the call state is established by the synchronization establishing means only between the slaves having the same identification code. It is done.

According to a fourth aspect of the present invention, operation input means for inputting a child machine number of a child machine which is desired to make a direct simultaneous call between the child machines, and the child machine number inputted by the operation input means are detected by the voice signal. A call designation assigning means included in the detection signal from the means, and a call designation handset that, when the detection signal is received, compares the call designation handset number included in the received detection signal with the handset handset number. A number comparing means is provided, and the control means matches the call designating slave unit number only when it is determined that the call designating slave unit numbers match based on the comparison result by the call designating slave unit number comparing means. The synchronization establishing means is controlled so as to synchronize the transmission / reception in the communication state based on the detection signal and the transmission / reception timing set by the transmission / reception timing setting means.

According to a fifth aspect of the present invention, when it is determined that the call designating slave unit numbers match based on the comparison result by the call designating slave unit number comparison means, the detection signal that the call designating slave unit numbers match. Is provided with a display unit for displaying the slave unit number included in.

According to a sixth aspect of the present invention, when the call designating unit determines that the call designating unit numbers match based on the comparison result by the call designating unit number comparing unit, the call designating unit. The slave unit number included in the detection signal in which the unit numbers match is included in the detection signal from the voice signal detecting means as the call designating slave unit number.

[0013]

Therefore, according to the first aspect of the present invention, the number of handset units that directly carry out a simultaneous call between handset units in each handset unit by the operation input by the handset unit number input unit, and the handset units that are different for each handset unit. By setting the number, the transmission / reception timing setting means sets the transmission / reception timing of its own station in the idle state. Then, when the direct simultaneous call between the slave units is started, the detection signal sending unit includes the slave unit number of its own station in the detection signal from the voice input detecting unit and sends it to the other slave unit, and the detection signal and the idle state. In accordance with the transmission / reception timing of its own station in the communication state, the transmission / reception in the communication state is synchronized to establish synchronization, and when the above-mentioned detection signal is received also in the other handset, the received detection signal and each child Based on the transmission / reception timing of the local station in the idle state of the machine, the transmission / reception in the communication state is synchronized to establish the synchronization. Then, when the other handset receives an audio signal at the reception timing of its own station, the control means controls the audio signal transmission means so as not to shift to the transmission operation at the transmission timing of its own station, and By controlling to shift to the receiving operation even at the transmission timing in the idle state of the own station, the voice state is automatically input to the microphone by inputting the voice message and the direct simultaneous call between the handsets is performed. In addition, it is possible to prevent mutual interference of radio waves in a call state and to make a good call.

According to the second aspect of the present invention, after the transmission / reception synchronization is established in the call state, the control unit transmits the transmission timing of the own station in the idle state and the transmission of the transmission source slave unit to which the voice signal is transmitted in the call state. When it is determined that the timing is different, the detection signal sending means is controlled to send the detection signal including the handset unit number of the own station to the other handset at the transmission timing of the own station in the idle state, thereby making the idle state. It is possible to secure the transmission / reception timing in.

According to the third aspect of the invention, each slave unit is identified by a common identification code, and synchronization is established by the synchronization establishing means only between the slave units with which this identification code matches, and a call state is established. By doing so, it is possible to selectively restrict the slave units that perform direct simultaneous calls between the slave units.

According to the invention described in claim 4, when the direct simultaneous call between slave units is activated, the slave unit number of the slave unit which is desired to perform the direct simultaneous call between slave units is set by the operation input by the operation input means. The call designation assigning means includes the set slave unit number in the detection signal. Then, at the time of starting the direct simultaneous call between the handset units, when each of the handset units receives the detection signal including the call designating handset number, the call designating handset number comparing means includes the call designator included in the received detection signal. The machine number is compared with the slave station number of the own station, and only when the control means determines that the slave machine numbers match based on the comparison result, the synchronization establishing means is controlled to establish the transmission / reception synchronization in the call state. By performing the above-mentioned procedure, it is possible to arbitrarily select and control the slave units that are allowed to make a direct simultaneous call between the slave units.

According to the invention described in claim 5, when a detection signal including a call designating slave unit number is received at each slave unit at the time of starting a direct simultaneous call between the slave units, the call designating slave unit number is received. When the control means determines, based on the comparison result by the comparison means, that the call-designated handset number included in the received detection signal matches the handset handset number, the display means includes the received detection signal. By displaying the cordless handset number, it is possible to easily determine from which cordless handset the designated call request is received.

According to the invention described in claim 6, when a detection signal including a call designating slave unit number is received in each slave unit at the time of starting a direct simultaneous call between the slave units, the call designating slave unit number When the control means determines, on the basis of the comparison result by the comparison means, that the call designation slave unit number included in the received detection signal and the slave unit number of the own station match, the call designation assigning means receives the detection signal. By including the cordless handset number included in the call detection cordless handset number in the detection signal sent from the local station, even when returning to the idle state, re-calling with the cordless handset for which the designated call request is continuously issued It can be performed.

[0019]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a slave unit in a digital cordless telephone as an embodiment of the present invention, and FIG. 2 is a timing chart showing transmission / reception timing of each slave unit in the digital cordless telephone in an idle state. 3 and 4 are timing charts showing the transmission / reception timings of the respective cordless handsets in the digital cordless telephone in the call state, and FIGS. 5 to 7 are flow charts showing the operation control of the direct cordless telephone conversation between the cordless handsets in the digital cordless telephone. .

In FIG. 1, 1 is a microphone as a transmitter, 2 is a speaker as a receiver, and 3 is an analog voice input to the microphone 1 in accordance with μ-1aw.
64 kbps input with sampling at kHz / 8 bit and conversion to digital data of 64 kbps
VOX that outputs the VOX signal separately to the PCM codec section 4 that decodes the digital data of the above into an analog signal and outputs the analog signal to the speaker when the digital data converted by the PCM codec section 3 is lower than a certain set level. This is a judgment circuit.

Numeral 5 designates the digital data inputted through the VOX judgment circuit 4 as G.264 by CCITT (current ITU-TS). Data is compressed according to the 721 rule, converted into digital data of 32 kbps, and input 32 kbp
ADPCM codec section for decompressing the digital data of s to decode it into digital data of 64 kbps, 6 is data compressed by the ADPCM codec section 5 3
An additional signal is added to 2 kbps digital data and various control data to create a frame format signal format according to RCR-STD28 and compressed to a 384 kbps signal, and the input 384 kbps signal is decompressed to 38 kbps. It is a channel codec section that decodes and simultaneously analyzes the type of signal to determine whether it is a control signal, a voice signal or a VOX signal.

Reference numeral 7 is a phase change amount selected from ± π / 4 and ± 3π / 4 in accordance with the transmitted 2-bit signal π /.
An RF unit that performs digital modulation by the 4-shift QPSK modulation method, and is 384k from the channel codec unit 6.
The bps signal is modulated to a frequency of 1.9 GHz band, and the received 1.9 GHz signal is demodulated to a 384 kbps signal. Reference numeral 8 is a transmission / reception changeover switch for switching between the transmission section system and the reception section system based on the transmission timing and reception timing of its own station, and 9 is an antenna for transmitting and receiving signals.

Numeral 10 is a ten-key for inputting the telephone number of the other party,
An operation input unit including an external call button for shifting to an external call mode, a slave unit number registration mode and a direct simultaneous call button between slave units for shifting to a direct simultaneous call mode between slave units, and a send button for making a call connection in each mode, 11 Is a display unit for displaying information based on the information input by the operation input unit 10 and the received information, and 12 is the VOX signal from the VOX determination circuit 4, the control signal and VOX signal analyzed by the channel codec unit 6, and the operation. The control unit performs various controls based on an operation input signal from the input unit 10 and controls a communication protocol.

A direct simultaneous call between the handset units in the handset unit of the digital cordless telephone configured as described above will be described. In the present embodiment, a case will be described in which the number of slave units for direct simultaneous call between slave units is four.

When the direct handset simultaneous call button of the operation input unit 10 is operated in each handset that performs direct handset call between handset units, the handset number registration mode is entered first,
In this cordless handset number registration mode, input the telephone number of the other party while confirming the contents displayed on the display unit 11. Input the number of cordless handsets for direct simultaneous call between cordless handsets and the cordless handset number of the own station by operating the ten keys. To do. In the case of the present embodiment, since 4 units make a direct simultaneous call between the slave units, after inputting "4", "1", "2", "3", "as the slave unit numbers of the own station.
Select any one of 4 "so that it does not overlap with the slave unit number of the slave unit of another station.

When the number of slave units for direct simultaneous call between slave units and the slave unit number of the own station are input, the control unit 12 recognizes the number of frames used for direct simultaneous call between slave units and other slave units. The transmission timing in the idle state of the own station after the synchronization with is established is set.

That is, in the idle state and the call state, 5
The msec (1 frame) is divided into eight, and the first four are allocated to the transmission slots and the latter four are allocated to the reception slots.
The 1st transmission slot and 5th reception slot, 2nd transmission slot and 6th reception slot, 3rd transmission slot and 7th reception slot, and 4th transmission slot and 8th reception slot are 1 pair each. Are transmitted and received, and in the case of the present embodiment, the operation input unit 1
Since "4" is operated and input by 0, as shown in FIG. 2, 2 frames are used as one unit and sequentially recognized as the 1st to 16th, and "1" is operated as the slave unit number. When input, the first slot in an empty channel is set as the transmission timing of the own station as the transmission timing in the idle state after the establishment of synchronization, and the fifth, ninth and 13th slots are set as the reception timing. To do.

Further, when "2" is input as the slave unit number, the slave unit with the slave unit number "1" is at the reception timing as the transmission timing of its own station in the idle state after the synchronization is established. The slot is set, the slave unit with the slave unit number “1” is set as the reception timing, the first slot and the ninth and 13th slots at the transmission timing are set, and “3” is operated and input as the slave unit number. In the idle state after the synchronization is established, the slave units having the slave unit numbers “1” and “2” set the ninth slot at the reception timing as the transmission timing of the own station in the idle state after the synchronization is established, and the slave unit number is set as the reception timing. The slaves of 1 ”and“ 2 ”set the 1st, 5th and 13th slots at the transmission timing, and“ 4 ”is operated as the slave number. If the slave station numbers “1”, “2” and “3” are set as the transmission timing of the own station in the idle state after the synchronization is established, the 13th slot at the reception timing is set, and the reception timing is set. As a result, the slave units with the slave unit numbers “1”, “2”, and “3” set the first, fifth, and ninth slots at the transmission timing.

Therefore, in the idle state after the establishment of synchronization, when the slave unit with the slave unit number "1" is in the transmitting state, the slave units with the other slave unit numbers "2", "3" and "4" are in the receiving state. When the slave unit with the slave unit number “2” is in the transmitting state, the slave units with other slave unit numbers “1”, “3” and “4” are in the receiving state, and the slave unit with the slave unit number “3” is When the cordless handset is in the transmission state, the cordless handsets of other cordless handset numbers "1", "2" and "4" are in the reception state, and when the cordless handset of the cordless handset number "4" is in the transmission state. The handset units with handset numbers "1", "2", and "3" enter the reception state, and VOX can be performed without interfering radio waves with each other.
Signals can be sent and received.

Although the transmission timing of the slave unit having the slave unit number "1" is the first slot and the reception timing is the fifth slot, the present invention is not limited to this.
The 6th, 7th, and 8th slots may be used as the reception timing, and the 3rd, 4th, and 4th slots may be used as the transmission timing. At this time, the slave units with the handset numbers "2", "3", and "4" The transmission / reception timing is set with reference to the transmission / reception timing set in the child device with the child device number “1”.

Then, in the slave unit number registration mode, the operation input unit 10 operates and inputs the number of slave units for direct simultaneous communication between slave units and each slave unit number, and the control unit 12 controls each slave unit in an idle state after synchronization is established. When the transmission / reception timing of the device is set, it becomes the direct simultaneous call mode between the handset,
In this direct handset simultaneous talk mode, when the transmission button of the operation input unit 10 is operated in each handset, the handset is synchronized with each other and the idle state is entered.

Regarding the operation of shifting to the idle state,
For example, a case where the transmission button of the operation input unit 10 of the child device with the child device number “1” is first operated will be described. When the transmission button of the operation input unit 10 of the child device number “1” is operated, the child device of the child device number “1” performs carrier sense on the communication carrier, and the reception slot section (one slot section) becomes When it is confirmed that it can be used (vacant) for four or more consecutive frames, the corresponding slot is set as the reference transmission timing in the direct simultaneous call between handset units.

Then, in the slave unit having the slave unit number "1",
The VOX determination circuit 4 outputs the VOX signal output to the control unit 12 when it is determined that the voice signal from the microphone 1 digitally converted by the PCM codec unit 3 is lower than a predetermined level and is silent. After the VOX signal output from the VOX determination circuit 4 includes the cordless handset number “1” of the local station, the channel codec unit 6
Output. Then, the channel codec unit 6 adds an additional signal to the VOX signal to create a predetermined signal format and compresses the compressed VOX signal.
The F section 7 performs digital modulation by the modulation method of π / 4 shift QPSK and modulates it to a frequency of 1.9 GHz band,
The control unit 12 controls the transmission / reception changeover switch 8 so that the VOX signal modulated by the RF unit 7 is transmitted from the antenna 9 at the timing of the corresponding slot.

The slave unit numbers "2", "3" and "
When the VOX signal transmitted from the slave unit with the slave unit number "1" is received by the antenna 9 by scanning all channels of the communication carrier in the slave unit with 4 ", the received VOX signal is transmitted / received by the switch 8 Via RF
After being input to the section 7 and demodulated, it is output to the channel codec section 6, and the channel codec section 6 decompresses and decodes the input VOX signal, and at the same time determines that the VOX signal is the VOX signal to the control section 12. Output.
The control unit 12 selects the frequency and the transmission timing of the radio wave transmitted by the local station based on the VOX signal, the slave unit number “1” included in the VOX signal, and the transmission / reception timing in the idle state of the local station.

In this state, the cordless handset number "2", "
When the transmit button of the operation input unit 10 is operated in each of the slave units of 3 "and" 4 ", the VOX signal of the own station is transmitted by the same operation as the slave unit of the slave unit number" 1 "at the selected frequency and transmission timing. Then, the slave unit "1" is synchronized with the slave unit that operated the send button, and the slave unit shifts to the idle state.

In the present embodiment, as the operation of shifting to the idle state, the case of operating the transmission button of the slave unit with the slave unit number "1" was explained first, but the present invention is not limited to this. Handset numbers "2", "3" and "4"
Similarly, the idle state can be entered by operating any of the transmission buttons of the child device. As the operation at this time, the slave unit whose transmission button is operated first performs carrier sense similarly to the operation of the slave unit with the slave unit number “1” according to the above description, confirms an empty channel and slot, and confirms the corresponding slot. The VOX signal is transmitted by setting it as the reference transmission timing in the direct simultaneous call between the handset units, the VOX signal is received by the other handset units, and by operating the send button, the corresponding slot is set. It is possible to synchronize and shift to the idle state.

In the idle state after the synchronization is established, for example, when a voice message is input to the microphone 1 of the handset having the handset number "1", the analog voice message input to the microphone 1 is PCM.
After being converted into digital data by the codec unit 3, it is input to the VOX determination circuit 3, and since the digital data input here is higher than the set level, it is determined that the input from the microphone 1 is sound and the determination is made. The result is output to the control unit 12, and the control unit 12 controls the transmission / reception changeover switch based on the determination result so as to switch to the transmission unit system at the transmission timing of the own station in the idle state and the own station in the idle state. At the transmission timing (first slot shown in FIG. 2) of
After transmitting a signal different from the X signal, the communication state is entered, and thereafter, the transmission / reception selector switch is switched so as to switch to the transmission system at the transmission timing (first and ninth slots shown in FIG. 3) in the conversation state. Control.

On the other hand, the voice data input to the VOX determination circuit 4 is input to the ADPCM codec section 5, where predetermined data compression is performed and the channel codec section 6 is performed.
Output. The channel codec section 6 adds an additional signal to the data-compressed audio digital data to create a predetermined signal format and compresses the compressed audio digital data.
1.9G by performing digital modulation by PSK modulation method
The frequency is modulated in the Hz band, and the control unit 12 controls the transmission / reception changeover switch 8 so that the RF is transmitted at the transmission timing of the own station in the idle state (the first slot shown in FIG. 2).
The audio digital data modulated by the unit 7 is transmitted from the antenna 9 and then R is transmitted at the transmission timing of the own station in the talking state (the first and ninth slots shown in FIG. 3).
The digital audio data modulated by the F unit 7 is transmitted.

Then, the cordless handset numbers "2", "3" and "
Since the slave unit of 4 "has the reception timing in the transmission timing in the idle state of the slave unit of" 1 ", the audio digital data transmitted from the slave unit of" 1 "is received by the antenna 9. The received digital audio data is transmitted via the transmission / reception changeover switch 8 to the R
After being input to the F section 7 and demodulated, it is output to the channel codec section 6, and the channel codec section 6 decompresses and decodes the input audio digital data, and at the same time determines that it is audio data, the ADPCM codec section Output to 5. In the ADPCM codec section 5, the input audio digital data is decompressed and decoded, and VO
The audio digital data input here is input to the PCM codec unit 3 via the X determination circuit 4, and after being decoded into an analog signal, the audio signal is output to the speaker 2 and emitted to the outside.

On the other hand, cordless handset numbers "2", "3" and "4"
The channel codec unit 6 determines that the transmission signal from the slave unit with the slave unit number “1” received by the slave unit is voice data instead of the VOX signal, and the control unit 12 controls the slave unit with the slave unit number “1”. When it is determined that the device has transitioned to the call state, it is determined whether or not the transmission timing of the slave device with the slave unit number "1" in the call state matches the transmission timing of the own station in the idle state.

As this determination method, the slave unit number of the slave unit whose transmission timing of the slave unit number "n" in the call state and the transmission timing of the idle state match is "n ±".
It is calculated from the fact that it is an even number of natural numbers and the calculation result is a natural number. That is, the transmission timing of the slave unit with the slave unit number “1” in the call state matches the transmission timing of the own station in the idle state. The child machine number of the child machine to perform is "1 ± even number of natural numbers", and the calculation result is a natural number, so "3", "5", "7"
... and so on, since the number of cordless handsets set for the call is "4", the cordless cordless handsets with the same transmission timing are "4" or less, and thus cordless cordless handsets with the cordless handset number "3" satisfying all the conditions. The transmission timing in the idle state of the slave unit number "
It is determined that the transmission timing is the same as the transmission timing in the call state of the 1 ”handset.

By such a determination method, when the control unit 12 of the slave unit with the slave unit number "3" is in the idle state, the transmission timing of its own station is the transmission timing of the slave unit with the slave unit number "1" in the talking state. When it is determined that they match, the transmission / reception changeover switch 9 is controlled to switch to the reception unit system even at the transmission timing of its own station in the idle state, while the control units of the slave units with the slave unit numbers "2" and "4" are controlled. 12 determines that the transmission timing of its own station in the idle state does not match the transmission timing of the cordless handset of the cordless handset number "1" in the communication state, and controls the transmission / reception changeover switch 9 to determine the transmission timing of its own station in the idle state. Control is performed so as to switch to the transmission system, and the VOX signal of the local station is transmitted at the transmission timing of the local station as in the idle state. Make.

In this state, if a voice message is continuously input to the microphone 1 of the slave unit with the slave unit number "1", the slave unit with the slave unit number "1" is in the call state and the slave unit Audio digital data is transmitted from the slave unit with the slave unit number "1" at the transmission timing of the slave unit number "1" in a call state, and the slave unit numbers of the slave units with the slave unit numbers "2", "3" and "4". Since the slave unit of "1" has the reception timing at the transmission timing, the slave unit having the slave unit number "1" enters the call transmission state by being received.

When the voice message input to the microphone 1 of the slave unit with the slave unit number "1" is completed in the call transmission state of the slave unit with the slave unit number "1", the PCM codec section in the VOX determination circuit 4 is completed. It is determined that the audio signal from the microphone 1 digitally converted by 3 is lower than a predetermined level and is silent, and the VOX signal representing the silent is output to the control unit 12. The control unit 12 shifts to an idle state based on the VOX signal from the VOX determination circuit 4 and also uses this VOX signal as a slave unit number "1" of its own station.
Then, the transmission is performed by the same operation as the above transmission operation.

Then, the slave unit numbers "2", "3" and "
When the VOX signal transmitted from the child device of the child device number “1” in the child device of 4 ”is received by the operation similar to the above receiving operation and is input to the control unit 12, the idle state is set here. Similar to the operation in the idle state after the synchronization is established, the VOX of the own station is transmitted at the transmission timing of the own station.
Send a signal.

When a voice message is input to the microphone 1 of the slave unit having the slave unit number "2" in the idle state after the synchronization is established, the slave unit number "1" is set.
The digital audio data is transmitted at the transmission timing in the idle state of the own station as in the case of the slave unit of the slave unit, and the slave units of the slave unit numbers “1”, “3” and “4” are the slave units of the slave unit number “2”. The voice digital data is transferred to the call state by receiving the voice digital data from the device, and then the voice digital data is transmitted at the transmission timing (the fifth and tenth slots shown in FIG. 4) in the call state of the handset device having the handset number "2". Is transmitted and received by the slaves with the slave numbers “1”, “3” and “4”, a call is made. By repeating the above operation, a direct simultaneous call between the slaves is made.

Then, by operating the transmission button (or the end call button) of the operation input unit 10 in the idle state or the call state after the synchronization is established, the operated slave unit is powered in the idle state or the call state. The power supply to each block to be supplied is cut off, the call ends, and the normal standby state is entered. Since the slave unit that ended this call scans all channels of the communication carrier in the normal standby state, when a direct simultaneous call between the slave units is performed between other slave units that have been set to call. Receives the VOX signal from each slave unit,
Upon reception of the OX signal, the control unit 12 selects the frequency and the transmission timing of the radio wave transmitted by the local station. Therefore, if the transmission button is operated again, the direct communication between the handset units between the handset units set again in advance is performed again. You can participate.

Further, even when the handset is terminated in each handset and the direct handset handset simultaneous call is not performed between the handset units set in advance, the handset handset direct handset call mode is canceled and another mode is set. (For example, if you have not transitioned to the external line communication mode etc.), operate the send button on each child device, and perform carrier scan on the child device for which the send button was operated to check for empty channels and slots, By transmitting the VOX signal by setting the corresponding slot as a reference transmission timing in the direct simultaneous call between the handset units, when the VOX signal is received by another handset unit and the transmission button is operated, transmission is performed. It is possible to make a direct simultaneous call between the handset units between the handset units whose buttons are operated.

As described above, the operation control of the handset when the direct inter-handset simultaneous call button of the operation input unit 10 is operated will be described with reference to the flowcharts shown in FIGS. 6 and 7. The flowchart shown in FIG. 6 shows the operation control of the child machine in the child machine number registration mode, and the flowchart shown in FIG. 7 shows the operation control of the child machine in the direct call mode between the child machines.

First, the operation control of the slave unit in the slave unit number registration mode will be described with reference to the flowchart shown in FIG. When the direct call button between the handset units of the operation input unit 10 is operated, the handset unit number registration mode is set,
This flowchart is started and the process moves to step F1. In step F1, the display unit 11 is controlled to display, for example, "Enter the number of slave units of the slave unit for direct simultaneous call between slave units." Make an input request for the number of slave units, move to step F2,
In step F2, the numerical value input by the operation input unit 10 is input as "Xn", and the process proceeds to step F3.

In step F3, the display unit 11 is controlled to display, for example, "Enter the cordless handset number of your own station so that it does not overlap with the cordless handset number of another station." A number input request is made, and the process proceeds to step F4. At step F4, the numerical value input by the operation input unit 10 is changed to "N".
input as "o", and the process proceeds to step F5.

In step F5, it is determined whether the number "Xn" of slave units input in step F2 is equal to or larger than the number "No" of slave units input in step F4, and the number "Xn" of slave units is determined. If it is determined that it matches or is larger than the cordless handset number “No”, step F
If it is determined that the number of handset units "Xn" is smaller than the handset unit number "No", the number of handset units "Xn" and handset unit number "No" input by the operation input unit 10 are entered. It is determined that the setting is wrong (error), the process proceeds to step F1 and the above operation is repeated. The determination result may be displayed on the display unit 11.

In step F6, initial setting for performing the calculation formula is performed, "χ" used in the calculation formula is set to "all natural numbers of Xn to 1", the process proceeds to step F7, and in step F7, input in step F2. Number of handset units "Xn"
Is an even number, and if it is not an even number, the process proceeds to step F8, the calculation formula of "Xn + 1" is performed here, the calculation result is set to "Xn '", and then the process proceeds to step F10. If it is determined in step F7 that the number is even, the process moves to step F9 and "Xn" is changed to "X."
After setting n ′ ″, the process proceeds to step F10.

In step F10, the calculation formula of "2 * Xn '" is performed to obtain the calculation result as "n".
The value of n ″ is set as the number of frames to be used as one unit in the idle state, the process proceeds to step F11, and in step F11, the calculation formula “No + (3 * No−1)” is executed and the calculation result is “Tx”. Then, the value of “Tx” is set as the transmission timing Tx of the own station in the idle state, and the process proceeds to step F12.

In step F12, "4 * Xn- (4χ-
1) ”is calculated and“ χ ”set in step F6
A plurality of calculation results for all values of “Rx”, the process proceeds to step F13, and in step F13, the plurality of “Rx” obtained in step F12 is calculated to step F11.
Remove the value that matches “Tx” calculated in
The value of "Rx" from which "x" is removed is set as the reception timing Rx of the own station in the idle state, the flow chart is ended, and the mode is shifted from the handset number setting mode to the next direct handset simultaneous call mode.

Next, the operation control for shifting the slave unit to the idle state in the direct simultaneous talk mode between the slave units will be described with reference to the flowchart shown in FIG.

In the slave unit number registration mode, when the number of slave units for direct simultaneous call between slave units and each slave unit number have been input, and the transmission / reception timing of each slave unit in the idle state after the establishment of synchronization has been set. The flow chart is started and the process proceeds to step F21. Step F21
Then, all channels of the communication carrier are scanned and the process proceeds to step F22.
It is determined whether the VOX signal from the slave unit having the preset slave unit number is received by the channel scan by 21. If it is determined that the VOX signal is not received, the process proceeds to step F23, and the VOX signal is transmitted. If it is determined that it has been received, the process proceeds to step F28.

Then, in step F23, the operation input unit 1
If it is determined that the send button of 0 has been operated, and it is determined that the send button has not been operated, step F2
When it is determined that the operation has been repeated and the send button has been operated, the process proceeds to step F24.

In step F24, carrier sense is performed in the communication carrier to check the corresponding slots that can be used for four or more consecutive frames of one slot, and the process proceeds to step F25. In step F25, it is checked in step F24. The corresponding slot is used as a reference transmission timing, and at this transmission timing, VOX of the own station
A signal is transmitted and it transfers to step F26.

In step F26, it is judged whether or not the VOX signal from the slave unit having the preset slave unit number is received at the reception timing of the own station in the corresponding slot confirmed in step F24, and the VOX signal is not received. If it is determined, the process proceeds to step F25 to repeat the above operation, and if it is determined that the VOX signal is received, the process proceeds to step F27. In step F27, it is determined that the slave unit with the slave unit number included in the VOX signal received in step F26 has been synchronized, and this flowchart is ended, and the idle state is established after the synchronization is established.

On the other hand, when it is determined in step F22 that the VOX signal has been received and the process proceeds to step F28, it is determined in step F28 whether the send button of the operation input unit 10 has been operated and the send button has been operated. This determination operation is repeated until it is determined, and when it is determined that the send button has been operated, the process proceeds to step F30. In step F29, the V received in step F22
The process shifts to step F30 in synchronization with the OX signal, and in step F30, the VOX signal of the own station is transmitted at the transmission timing of the own station set in the slave unit number registration mode in the corresponding frame whose synchronization is established in step F29. The process moves to step F27.

In step F27, similarly to the above, it is determined that the slave unit with the slave unit number included in the received VOX signal has been synchronized, and this flow chart is terminated and the idle state is established after the synchronization is established. Note that steps F25 to F27 perform the same function as the operation control in the idle state.

With respect to the operation control of transition of the handset to the call state and the control operation of transition from the call state to the idle state when the idle state is established after the synchronization is established by the above operation control, based on the flowchart shown in FIG. Explain.

When the operation control or the call state is changed to the idle state to bring the idle state after the synchronization is established, this flowchart is started and the process proceeds to step F31. In step F31, it is determined whether or not a voice message is input to the microphone 1. When it is determined that no voice message is input, the process proceeds to step F32, and when it is determined that a voice message is input, the process proceeds to step F39. Transition.

In step F32, the transmission / reception changeover switch 8
Control to switch to the transmission system at the transmission timing of the own station in the idle state after the synchronization is established and to the reception system at the reception timing of the own station, and the transmission / reception operation of the VOX signal is performed, and the process proceeds to step F33. Transition.
In step F33, it is determined whether the signal received when switching to the receiving system in step F32 is a VOX signal or voice data. If it is determined to be a VOX signal, the process proceeds to step F31. If the above operation is repeated and it is determined that it is voice data,
The process moves to step F34. It should be noted that steps F31 to F33 are operation control in the idle state after the synchronization is established.

In step F34, the slave unit number "Nx" of the slave unit to which the voice data is transmitted is determined based on the transmission / reception timing in the idle state after the synchronization established in the slave unit number registration mode, and the process proceeds to step F35. . In step F35, it is determined whether or not the transmission timing of the cordless handset of the cordless handset number “Nx” determined in step F34 matches the transmission timing of the idle state of the local station, and it is determined that the transmission timings match. Then, if it is determined that the transmission timings do not match, the process proceeds to step F37.

In step F36, the transmission / reception changeover switch 8
Is controlled to switch to the receiving system at the transmission timing in the idle state after the synchronization is established, and in step F27, the transmission / reception changeover switch 8 is controlled to switch to the transmitting system at the transmission timing in the idle state after the synchronization is established. So that they are replaced in step F36.
Then, the process proceeds from step F37 to step F38.

In step F38, it is determined whether the signal received when switching to the receiving system is voice data or a VOX signal, and if it is determined to be voice data, it is determined to be a VOX signal. This determination operation is repeated until it is determined, and when it is determined that the VOX signal is received, it is determined that the communication state is released, the flow chart is terminated, and the state is shifted to the idle state after the synchronization is established. In this determination operation, when the voice data is not received a predetermined number of times or more than a predetermined time, it may be determined that the call state is released.

On the other hand, if it is determined in step F31 that a voice message has been input and the process proceeds to step F39, then in step F39 the voice message input to the microphone 1 is subjected to predetermined signal processing and transmitted as voice data. The process moves to step F40. In step F40, it is determined whether or not a voice message is input following the microphone 1. If it is determined that a voice message is input, the process proceeds to step F39 and the above operation is repeated, or a voice message is input. If it is determined that they are not, the process proceeds to step F41.

In step F41, the VOX signal of the own station is transmitted at the transmission timing of the own station in the call state,
The call state is released, the flow chart is terminated, and the state is changed to the idle state after the synchronization is established.

Therefore, a direct simultaneous call between the handset units is performed in each handset unit set for the call, and the handset unit for transmitting the call does not need to perform a button operation each time the call is sent, and simply causes the microphone 1 to input a voice message. As a result, this voice message can be transmitted to other slaves, other slaves can receive this voice message and emit sound, and the slaves must not have the same transmission timing. It does not make communication impossible.

Next, a case will be described in which it is assumed that a common master ID (identification code) is used as a call setting condition for the slaves that directly carry out simultaneous calls between the slaves. Each slave unit is grouped by its master unit ID,
The master unit ID (hereinafter referred to as CS-ID) is discriminated by the control unit 12 from each other by transmitting / receiving a signal between the slave units. Therefore, the control unit 12 compares the CS-ID with the CS-ID registered in the own station, and controls the wireless connection when it is determined that the CS-IDs match, The common identification code can be used to limit the handset units used for direct simultaneous calls between handset units.

Next, a case will be described in which the common password is set as the call setting condition of the slaves which directly carry out a simultaneous call between the slaves. In the cordless handset number registration mode, a common secret code number is input to each cordless handset by an operation input from the operation input unit 10, and the secret code is used as a secret key code. The scramble process is performed and transmitted, and the receiving side cancels the scramble process of the received signal by generating the phase amount and reset timing of the shift register that cancels the scramble process from the common secret key code on the receiving side. Except for handset units that have a common security code in a call, the transmitted signals are scrambled and cannot be decoded even if they can be received.Therefore, it is possible to limit the handset units used for direct simultaneous call between handset units. it can.

Next, a case will be described in which the number of slave units for direct simultaneous call between slave units and the slave units to talk after the input of each slave number are limited. If you want to establish a call connection only with an optional slave unit after setting the number of slave units for direct simultaneous call between slave units and the slave unit number of your own station, but before establishing synchronization, that is, before operating the send button, send Input unit 1 for the cordless handset number of the cordless handset that you want to connect to before the button operation
Operate the numeric keypad 0 to input. Then the control unit 1
2 displays the slave unit number input based on the operation input from the operation input unit 10 on the display unit 11, and displays the slave unit number displayed on the display unit 11 by operating the transmission button of the operation input unit 10 as a VOX signal. And send it. Then, when each slave unit receives the VOX signal including this slave unit number, the control unit 12 compares it with the slave unit number of its own station, and if it is determined that they match based on the comparison result, the VOX signal is added to the VOX signal. If it is determined that the slave unit number included in the VOX signal received by the control unit 12 does not match the slave unit number of the local station, the local station cannot participate in the call. It is controlled so as not to synchronize with the received VOX signal.

At this time, in the slave unit in which the slave unit number included in the received VOX signal and the slave unit number of the self station match, the VOX signal of the self station transmitted at the transmission timing of the self station for synchronization. By including the partner handset number included in the received VOX signal, the synchronization is established only between the handset that made the call request and the handset that made the call request, and the idle state is established. Will be moved to. And
In this idle state, the VOX signal transmitted at the transmission timing of the own station always includes the partner's handset number, so that the synchronization with the handset that has received the call request can be automatically maintained.

Therefore, when the slave unit number included in the received VOX signal and the slave unit number of the self station match, the call connection is established by shifting to the idle state after the synchronization is established, and thereafter the voice message is sent to the microphone 1. By inputting, the VOX is released and a call state is established, and a call with any child device can be performed.

Then, in a state where a call is being made with an arbitrary slave unit, the control unit 12 causes the display unit 11 to display the partner side slave unit number included in the VOX signal received first, so that whichever slave unit is present. When it is possible to determine whether a call request has been received from the device together with the voice message emitted from the speaker 2 and want to make a call again with the handset that made the call request operation after the communication with the partner handset is completed. At
By inputting the cordless handset number displayed on the display unit 11 by the same operation as described above, the telephone call can be made only in synchronization with the cordless handset that received the call request. It is possible to perform operation input of an arbitrary slave unit number without remembering the unit number.

The data displayed on the display unit 11 may be deleted only by operating the operation input unit 10, or the slave unit number previously displayed on the display unit 11 may be stored. If the stored slave unit number is called by the operation of the operation input unit 10 and displayed on the display unit 11, the slave unit number displayed on the display unit 11 when the transmission button of the operation input unit 10 is operated. Since the VOX signal is included in the VOX signal, it is possible to make a call again in synchronization between the slaves that have requested the call or the slaves that have requested the call, between the slaves that previously performed the call request operation.

In the idle state after the synchronization is established,
When it is desired to make a call only with an arbitrary slave unit, the slave unit number of the slave unit with which a call is to be connected is input by operating the ten keys of the operation input unit 10 before inputting the voice message. Then, the control unit 12 displays on the display unit 11 the slave unit number that is input by the operation input unit 10, and the display unit 11
The slave unit number displayed at is included in the VOX signal and transmitted at the transmission timing of the own station. Then, when each slave unit receives the VOX signal including this slave unit number, the control unit 1
2 is compared with the cordless handset number of its own station, and when it is determined that they match based on the comparison result, the audio data received thereafter is subjected to predetermined signal processing so that the speaker 2 outputs the sound. VOX controlled and received by the control unit 12
When it is determined that the cordless handset number included in the signal does not match the cordless handset number of the local station, control is performed so that predetermined signal processing is not performed on the audio data that is subsequently received.

At this time, the slave unit included in the received VOX signal matches the slave unit number included in the received VOX signal and the slave unit number of the own station to establish a call state. By displaying on the display unit 11 and including it in the VOX signal transmitted at the transmission timing of the own station,
By inputting a voice message to the microphone 1 of the handset for which a call request has been made after the call of the partner handset, only the handset that has made a call request outputs voice data from the speaker 2. It is possible to maintain the call state between the handset units which are limited to the handset unit.

Further, when a telephone call is made between the handset units that are limited to the handset unit and the voice message is input to the handset unit that has not requested the call, the transmission timings may coincide. From each VOX
When a signal other than the signal is received, the audio data is controlled not to be transmitted even at the transmission timing of the own station in the idle state after the establishment of synchronization.

In the embodiment limited to the telephone handset after the synchronization is established, predetermined signal processing is performed on the voice data received by the handset whose handset handset number included in the VOX signal does not match the handset handset number. It was impossible to make a call by controlling so that the secret key code is not limited to this.For example, the secret key code is sent together with the slave unit number and the secret key code is sent only to the own station and any slave unit. It may be possible to make a call only with an arbitrary handset by performing the scramble process. Further, the number of arbitrary slave units that want to make a call may be plural.

Therefore, the VO to be transmitted before the establishment of synchronization
The slave unit of the slave unit that wants to make a call to the VOX signal transmitted in the idle state after synchronization is established while connecting the call with any slave unit by including the slave unit number of the slave unit to make a call in the X signal By including the number, it is possible to make a call with any child device.

As the call setting condition input as described above, for example, after inputting the number of handset units for direct simultaneous call between handset units and handset handset number in the handset number input mode, "CS- Do you group by ID? ”
It is also possible to display on the display unit 11 such as a display such as "Do you want to group by personal identification number?" And make the judgment by the operation input from the operation input unit 10, and the present invention is not limited to this. For example, instead of the display by the display unit 11, the speaker 2 serving as a receiver may notify the user by voice.

Further, in the present embodiment, the number of handset units for direct simultaneous call between handset units was four, but the number is not limited to this, and for example, the number of handset units may be five or six, respectively. Select and enter the slave unit numbers so that they do not overlap, and set 3 frames to 1
It may be used as a unit to be recognized as the 1st to 24th in order, and the transmission timing in the idle state may be set in each slave, or the number of slaves may be set to 7 or 8 and slaves may be set in each slave. Select and enter the machine numbers so that they do not overlap, and use 4 frames as one unit to sequentially
It may be recognized as the 32nd, and the transmission timing in the idle state may be set in each slave unit,
Further, the number of slave units may be increased.

Further, in this embodiment, since data for one slot (625 μsec) is reconstituted in the time of one frame (5 msec) in the ADPCM 5, it is not possible to process a call by two people at the same time. However, for example, two or more ADPCM are provided. It is also possible to call two people at the same time by synthesizing them in an analog manner after they are combined.

[0087]

As described above, according to the invention as set forth in claim 1, the number of slave units for direct simultaneous call between slave units in each slave unit and a different slave unit number for each slave unit are set in advance. This sets the transmission / reception timing of the own station in the idle state. Then, when a direct simultaneous call between slave units is activated, a detection signal including the slave unit number of the local station is sent to another slave unit, and based on the detection signal and the transmission / reception timing of the local station in the idle state. When synchronization is established by synchronizing transmission / reception in a call state, and when the above-mentioned detection signal is received in other slave units, the received detection signal and transmission / reception of the own station in the idle state of each slave unit If the synchronization is established by synchronizing the transmission and reception in the call state based on the timing of, and the signal received by the other handset is a voice signal, the transmission operation does not shift at the transmission timing of the voice signal. By shifting to the receiving operation, it is possible to automatically switch to the call state by inputting a voice message to the microphone and make a direct simultaneous call between the handset units. Therefore, it is possible to save the trouble of the switch operation for the user to input the voice message and prevent the mutual interference of radio waves from each other because the transmission of the voice signals does not overlap in the call state, and the call can be performed well. You can

According to the second aspect of the present invention, after the transmission and reception synchronization in the call state is established, the transmission timing of the own station in the idle state and the transmission timing in the call state of the slave unit to which the voice signal is transmitted by the control means. When it is determined that the idle state is in the call state, the detection signal sending means is controlled to send a detection signal including the handset unit number of the own station to the other handset at the transmission timing of the own station in the idle state, thereby making the idle state in the call state. Since it is possible to secure the transmission and reception timing of the state, when the call state shifts to the idle state, the detection signal can be transmitted and received according to the previously set idle state transmission and reception timing, and re-search for empty channels can be omitted. be able to.

According to the third aspect of the present invention, each slave unit is identified by a common identification code, and synchronization is established for transitioning to a call state only between the slave units whose identification codes match. As a result, since it is possible to limit to only the slaves identified by the common identification code as the slaves that perform the direct simultaneous call between the slaves, it is possible to perform the direct talk between the slaves with a high degree of confidentiality.

According to the invention described in claim 4, at the time of starting the direct simultaneous call between the handset units, if the partner handset to which the direct handset call between the handset units is to be made is selected, the call-designated handset number of each handset unit is selected. Establishing synchronization of transmission and reception in a call state only when it is determined that the call-designated cordless handset number included in the received detection signal matches the cordless handset number of the local station By doing so, it is possible to limit the number of handset units that perform direct simultaneous call between handset units after setting the handset number. Instead of making a call, you can make a call by limiting a specific handset from the set handset and make a simultaneous simultaneous call between handset with a high degree of confidentiality. I was asked by the slave user No it is possible to perform a private conversation.

According to the invention described in claim 5, when a detection signal including a call-designated handset number is received by each handset when the direct simultaneous call between handset units is started, the received detection signal is received. When it is determined that the call-designated cordless handset number included in and the cordless handset number of the local station match, the cordless handset number included in the received detection signal is displayed, so that any of the cordless handsets can request a designated call request. Since it is possible to easily determine whether or not the designated call request has been received, when making a call again with the cordless handset for which the designated call request was issued after the end of communication, the designated call request was easily issued by the operation input of the user. It is possible to shift to the call state with the child device.

According to the invention described in claim 6, when a detection signal including a call-designated handset number is received by each handset at the time of starting a direct simultaneous call between handset units, the received detection signal is received. When it is determined that the call-designated cordless handset number included in and the cordless handset number of the local station match, the cordless handset number included in the received detection signal is sent as a call-designated cordless handset number from the local station. By including the specified call request, it is possible to continue to make a call again with the cordless handset for which the designated call request was issued even after shifting to the idle state. Instead, it is possible to re-call the handset with which the designated call request is issued by simply inputting a voice message into the microphone.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a slave unit in a digital cordless telephone which is an embodiment of the present invention.

FIG. 2 is a timing chart showing a transmission / reception timing in an idle state of each handset in the digital cordless telephone.

FIG. 3 is a timing chart showing transmission / reception timings of the respective cordless handsets of the digital cordless telephone in a call state.

FIG. 4 is a timing chart showing transmission / reception timings of the respective cordless handsets of the digital cordless telephone in a call state.

FIG. 5 is a flowchart showing operation control of direct simultaneous call between handset units in the digital cordless telephone.

FIG. 6 is a flowchart showing operation control of direct simultaneous call between handset units in the digital cordless telephone.

FIG. 7 is a flowchart showing operation control of direct simultaneous call between handset units in the digital cordless telephone.

[Explanation of symbols]

 1 Microphone 2 Speaker 3 PCM Codec Section 4 VOX Judgment Circuit 5 ADPCM Codec Section 6 Channel Codec Section 7 RF Section 8 Transmit / Receive Switch 9 Antenna 10 Operation Input Section 11 Display Section 12 Control Section

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H04M 1/72

Claims (6)

[Claims] 1. A digital device comprising a base unit and a plurality of handset units, capable of making a call by differently transmitting and receiving and making a direct simultaneous call between the handset units among the plurality of handset units. In a cordless telephone, a slave unit number setting unit that sets a slave unit number for direct simultaneous call between slave units to each slave unit and assigns a different slave unit number to each slave unit, and the slave unit number setting unit Transmission / reception timing setting means for setting transmission / reception timing of the own station in an idle state based on the number of slave units and slave unit number set by the voice input detection means for detecting presence / absence of sound input to the microphone And the detection signal from the voice input detection means includes the cordless handset number of its own station, and the detection signal including the cordless handset number of the own station is added to another cordless handset based on the timing set by the transmission / reception timing setting means. A detection signal sending means for sending, upon receiving the detection signal, the detection signal thereof received,
Synchronization establishing means for synchronizing transmission / reception in a call state based on the slave unit number included in the detection signal and the transmission / reception timing set by the transmission / reception timing setting means, and the own station after synchronization is established by the synchronization establishing means. A transmission unit that shifts to a transmission operation at the transmission timing, and transmits a sound input to the microphone to another slave unit at this time, and a reception unit that shifts to a reception operation at the reception timing of the own station after the synchronization is established by the synchronization establishing unit. Means and, when a voice signal is received by the receiving means, determines a transmission source slave unit based on the reception timing of the voice signal and the transmission / reception timing set by the transmission / reception timing setting unit, and the transmission source slave unit. The sound input to the microphone at the transmission timing in the call state of the other is transmitted to the other handset A digital cordless telephone, which is provided with control means for controlling the voice signal transmitting means so that the voice signal transmitting means is controlled so as not to exist, and for controlling the voice signal receiving means so as to shift to the receiving operation regardless of the transmission timing of the own station in the idle state. . 2. The control means, when the transmission timing of its own station in the idle state and the transmission timing of the voice signal transmission source handset in the talking state are different, the control means's child station at the transmission timing of its own station in the idle state. 2. The digital cordless telephone according to claim 1, wherein a detection signal including a machine number is sent to another slave. 3. The respective slaves are identified by a common identification code, and the synchronization of the call state is established by the synchronization establishing means only between the slaves having the same identification code. The digital cordless telephone according to claim 1. 4. An operation input means for inputting a child machine number of a child machine which wants to make a direct simultaneous call between the child machines, and a child machine number inputted by the operation input means as a detection signal from the voice signal detecting means. And a call designation cordless handset number comparison means for comparing the call designation slave unit number included in the received detection signal with the own handset unit number when the detection signal is received. The control means, only when it is determined that the call designating slave unit numbers match based on the comparison result by the call designating slave unit number comparing means, the detection signal and the transmission / reception timing when the call designating slave unit numbers match. 2. The digital code register according to claim 1, wherein the synchronization establishing means is controlled so as to synchronize transmission and reception in a call state based on the transmission and reception timing set by the setting means. Phone. 5. When the call designating slave unit number is determined to match based on the comparison result by the call designating slave unit number comparing means, the slave unit number included in the detection signal in which the call designating slave unit number matches. 5. The digital cordless telephone according to claim 4, further comprising display means for displaying. 6. The call designation assigning means, when it is determined that the call designation slave unit numbers match based on the comparison result by the call designation slave unit number comparing means, detects that the call designation slave unit numbers match. 5. The digital cordless telephone according to claim 4, wherein the cordless handset number included in the signal is included in the detection signal from the voice signal detecting means as the call designation cordless handset number.