JPS62248346A - Reception loudspeaking telephone set - Google Patents

Abstract

PURPOSE:To enable a transmission by the transmitter of a handset by operating a press-to-talk button keeping a reception loudspoken mode in an on-hook state, by providing a press-to-talk button. CONSTITUTION:The SW35 of an ST5 selects an input A by transmitting 'speaker on data', and a reception loudspeaker circuit is turned on, and by transmitting 'speaker off data&b the SW35 selects an input B, then the reception loudspeaker circuit is turned off. By operating the extension key of a call ST in the reception loudspoken mode where the call ST is in the on-hook state, the circuit of a speaker SP is turned off, and the circuit of a transmitter T is turned on, and it is possible to perform a transmission with a transmitter T that is placed under the on-hook state, without generating a singing due to acoustic coupling. And it is also advisable to use another key, or a dedicated switch instead of the extension key, as the press-to-talk button, and also, it is advisable to perform the same control not only in an extension calling state, but after migration to a talking state.

Description

[Detailed description of the invention] [Industrial application field] This is related to the now loudspeaker telephone.

[Conventional technology]

Such loudspeaker telephones perform voice amplification only in the on-hook state, and switch between the loudspeaker circuit and the handset circuit depending on the state of the hook switch.
・The handset of the handset cannot be used.

[Problem that the invention seeks to solve]

Therefore, in order to transmit a call while in the loudspeaker mode, the only option is to go off-hook and then use the handset to transmit a call.If you then set the loudspeaker mode again, you will need to perform an additional setting operation. This creates a problem in which off-hook operations and setting operations for the reception amplification mode are troublesome.

In order to be able to transmit and receive calls at the same time, it is possible to use a hands-free telephone, but in this case, in addition to the handset's transmitter, a dedicated microphone is required, and furthermore, the occurrence of ringing can be prevented. Purpose to do - positive Mk -4*-s y
K'fu 11-Menki Fuyuwa Kakegagara? - A problem arises in that the lightning packing machine is expensive.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention is constructed by the following means.

That is, in a loudspeaker telephone set that includes a transmitter circuit and a receiver circuit that perform calls in an off-hook state, and a loudspeaker circuit that performs system speaker reception in a loudspeaker mode in an on-hook state, there is a press that switches between transmitting and receiving according to an operation. a talk button, a determining means for determining the state of the press-talk button when it is in the receiving loudspeaker mode, and when the determining means determines that it is in the operating state, turning on the transmitter circuit and turning off the receiving loudspeaker circuit. A control means is provided which turns off the transmitter circuit and turns on the loudspeaker circuit when the means determines that the device is in the non-operating state.

[Operation] Therefore, in the on-hook state and in the loudspeaker mode,
By operating the press talk button, you can freely transmit calls using the handset's transmitter.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to figures showing examples.

In this case, a key telephone device including a main unit (hereinafter referred to as KSU) and a key telephone set (hereinafter referred to as ST) will be used as an example.

Figure 1 is a block diagram of KSUl, which handles complex voice frequencies (hereinafter referred to as MF) such as telephone lines from central offices or private branch exchanges.
) External lines 2, ~2n, including signal dial lines, are new customers,
These are relay contacts di-1, da-1, transformer LT1, and relay contact d, as shown in representative line 2□.
3-1, a communication path switch (hereinafter referred to as TR8) 11 composed of cross points such as analog switches
is connected to the external link Lc1 of \, where the external links Lc1~Len and the internal links Lix, Li2 are connected to cross points and transformers Ttl~Tt! Each ST1-5Trn is connected to each pair of communication lines 31-3m to 811-81m, which will be described later, via the line 811-81m, and each ST1-5Trn is connected to each pair of signal lines 4□-41! 1 is connected to a data transmitting/receiving circuit (hereinafter referred to as DSR) 12 via transformers T1 to T3□.

Furthermore, an incoming call detection circuit (hereinafter referred to as RDT) 13 is bridge-connected to the outside lines 2 and 2n via a capacitor C1, a resistor R1, and a contact ds-1, thereby detecting the arrival of a paging signal. The contact point dl-1,
Relay DI-1, DS-I with da-1, ds-1
A drive circuit (hereinafter referred to as DRY) 14 is provided for the external line 2.K. ~2n and corresponding relays DI-1~D
In addition, a communication path switch control circuit (hereinafter referred to as TRC) 15 is provided for the TR811, thereby driving each link Lc1 to Lc1 to D8-n individually. Lefk.

It controls each cross point of the LM 11L12 and performs exchange connections.

On the other hand, the main processor (hereinafter referred to as CPUm) as each means
21, and a sub-processor (hereinafter referred to as CPU) 22
The CPU 22 controls the 6sn 12 to send and receive data signals to and from each ST, and each received 8
The operation data of 7 is stored in the variable memory (hereinafter referred to as RAM) 23 common to the CP[J-old, and
The control data for each ST stored in the i-RAM 23 is read out and transmitted to each ST.

In addition, CPUm21 and CPU22 are each R
It is equipped with an internal memory similar to the AM23 and fixed memory (hereinafter referred to as ROM) 24, and processes data using a stored program method that executes programs stored in these memories. Control is often performed while accessing data to the internal memory and RAM 2.5.

Note that the ROM 24 stores programs and data other than those stored in the internal memory of the CPU-21, and this also restricts the operation of the CPUrn21.

Therefore, the CPUrn21 controls the DRV according to the detection power of the RDT13 and the operation data based on the operation of each ST.
l 4 control and TR (TR811 (7
) Control data is repeatedly connected to each ST via the CPU and 22° DR812, and each ST's indicator light, indicator, and tone signal are displayed. , which controls telephone calls.

Also, via DRVl 4 t/-D I-1~D
By driving I-n, the primary windings of the transformers LT and ~LTn close the DC loop for the outside lines 21 to 2n to acquire or hold the outside line, and for the pulse dial line, after acquiring the outside line. It is used to send dial pulses, and in this case, relay 08
-L~08-n are also driven at the same time, and contacts ds-1~ds
-n capacitor C1~Cn1 resistor R1~R
1 is connected in parallel to contacts di-1 to di-n for spark quenching, while contacts ds-1" to ds-n" connect high resistance resistors to the secondary windings of transformers LT1 to LTn. External line link Lc1 to the side where the devices R11 to R1n are inserted
~Lcn is connected to prevent the clinic sound accompanying the transmission of dial pulses from being given to each ST as a high level.

In addition, the secondary windings of transformers LT, ~LT, and the primary windings of transformers Ttl~Ttm, Tll~T1m,
For example, +5V power supply v1 is applied to the analog switch of TR811, and the transformers Ttl to Tt
A power supply v2 of, for example, +27V is applied to the neutral point of the secondary winding of transformer T, while the neutral point of the secondary winding of transformer T, 1 to Tam is connected to the power supply return path. ST
Phantom power is being supplied to the

FIG. 2 is a block diagram of Si2, showing the primary winding neutral point of transformer T1 to which communication line 3 is connected, and the primary winding neutral point of transformer T2 to which signal line 4 is connected. A power supply circuit 31 is connected between the transformer T1 and the power supply circuit 31, which stabilizes the power supplied from KSU1 and supplies it to each necessary part as a local power supply E. The inverting input of a differential amplifier (hereinafter referred to as DA) 33 is connected through a switch circuit (hereinafter referred to as %sw) 32 such as an analog switch, and the DA is connected through a termination resistor R3□ and 5W34.
The non-inverting input of DA 33 is connected, and the output of DA 33 is given to the receiver R of the handset, and is also sent to the speaker SP via 5W 35 and a power amplifier (hereinafter referred to as PA) 38.
A receiving circuit and a receiving loudspeaker circuit are constructed by the input signal K and the receiving circuit.

Further, the output of the transmitter T housed in the handset is transmitted through a preamplifier (hereinafter referred to as HA) 37 and resistors R33 to R36 for setting the transmitting level, each having a different resistance value, to a multiplexer ( Hereinafter, MPX) 38 inputs 1 to 4
A signal generation circuit (hereinafter referred to as
The output of TSG) 39 is given to the input T of MPX38 via capacitor C31 and resistor R3□,
The output of MPX38 is amplified by a transmitter amplifier (hereinafter referred to as TA) 4G, and then sent to the telephone line 3 via resistor R3□ and transformer T1, and is thereby connected to the transmitter circuit. is configured.

Furthermore, the output of TSG39 is also given to input B of 5W32, but when the MF flaw signal is sent from TSG39, 5W32.34 selects input A and
8 selects the entry cuff, an MP wound signal is sent to the telephone line 3 at a predetermined level via TA40, while DA3
5W32.34 is applied to the receiver R as a low-level sidetone, and during a call, 5W32.34 is applied to the input A.
, and the MPX 38 selects inputs 1 to 4 according to the transmission level according to the communication conditions, so the transmission audio is treated in the same way.

In addition, when sending out a tone signal for calling etc. from T8G39, 5W32.34 connects input B, and SW35 connects input A.
is selected, and MPX38 selects input 5.6, so the output of TSG39 is given only to PA3 B and receiver R, and speaker sp rings.

On the other hand, the secondary winding of transformer T has 1. DR841 is connected, and through this, a processor (hereinafter referred to as CPU) 42, which is equivalent to CPU 22, sends and receives data signals. key, held key,
In response to the output of the keyboard (hereinafter referred to as KB) 43, which is equipped with various function keys including a redial key, etc., operation data indicating these conditions is transmitted as transmission No. 4, while control data from No. 9 KSU 1 is received. According to the above, an indicator light group (hereinafter referred to as PL) 44, a display using a character display (hereinafter referred to as DP) 46.5W32, 34, 35. M
PX3B.

It controls TSG39 etc.

In addition, a reset circuit (hereinafter referred to as R
ES) 45 is provided, by which the CPU 42 is initialized.

Therefore, tone signals such as incoming external calls, incoming internal calls, and hold alarms are sent from the speaker SP, and correspondingly, the indicator light in PL44 lights up. dialing by pulse signal from , or M by TSG39
An F-fold signal dialing call is made, and the caller receives a response from the other party.
)・You can freely make calls using the handset T and receiver R of the handset.

In addition, extension calls are also made by dialing, but it is also possible to make calls using tone signals and calls using voice, and it is also possible to freely set memory dialing using MF double signals, reception amplification mode using speaker SP, etc. It is equipped with various functions required as a button telephone device.

Meanwhile, the TSG39 responds to the serial data SD and clock pulse CLK from the CPU 42, while the reception output DR of the DR841 is
42 is given to the interrupt input INT, and is treated as valid only when the CPU 42 cancels the prohibition of accepting interrupt inputs, and receives and operates control data in response to receiving a polling signal from KSUl. Data is transmitted.

FIG. 3 is a flowchart of steady processing by the CPO 21 of KSUl. After performing 1 initialization 101, 1 receiving data processing 111 from each ST and responding to incoming calls from outside lines 21 to 2n. 1 External call incoming processing '112 is carried out, and 1. Timeout processing due to time-up of each timer configured in CPU m21.
1 and 1 pending alarm processing 122 are performed, and then steps 111 and subsequent steps are repeated.

FIG. 4 is a flowchart of the interrupt processing by the CPU 21, which is repeated at a cycle of, for example, 5m5e. First, 'dial pulse sending processing' 201 is performed, and then the tortoise line is detected by the detection power of the RDT 13. After performing incoming call detection processing 1202, 'extension timer processing 121
1 and 1 pending alarm timer processing〃212, and after storing the control data in the RAM 23 by 1 transmission data cella)'221 for each ST1 to ST machine, commands are sent to the CPU, 22. Then, data transmission/reception I222 with the ST is performed for each ST1 to ST5Tffl.

FIG. 5 is a flowchart showing the details of step 111, and asks if there is received data? ``If 301 is Y (YES), the content of this is 1 extension key operation?'' 302 is determined, and when this result is Y, TR811 via TRC15 is determined.
If step 302 is N (No), 1 other operation data processing 312 is executed, and then the reception data processing from the 1st ST is performed. 321.

This is a flowchart similar to that shown in FIG. 5 for the case where 1 received data 6, l"401 is Y, the contents of this are determined by 1 dial key operation?"402, and if this is Y, the contents of the RAM 25 are Is 1 extension captured according to the status data? Check '403, and dial the 1st digit assuming Y of this? After determining 〃404,
If this is Y, a one-dial tone stop is performed for the ST who operated the extension key (411), whereas if step 404 is N, the second digit is dialed, and the called party responds to the two-digit extension number. 1 extension call processing for ST
Do 412.

Further, when step 402 is N, 1 other operation data processing 421 is performed, and when step 403 is N,
'After performing other dial key operation data processing〃423, the process moves to reception data processing from the primary ST〃431.

Therefore, in accordance with the above, when the calling ST operates the extension key and dials the extension number, the called ST
are also connected to the same extension link, completing the communication path between them.

FIG. 7 is a flowchart similar to FIG. 5 when the extension key of the calling ST is operated while on-hook or is not operated after FIG. ``If 501 is Y, the content of this is 1 extension key operation used as a press talk button?'' 502 is determined, and when this result is Y, 1 extension call status is determined according to the status data in the RAM 25? ' Check 503, and if it is Y, perform speaker-on data set "511 of one called ST" and speaker-off data set "512 of one called ST". These control data are stored in the RAM 23. , after making preparations for transmission in step 222, 1 call ST off-hook?"521 is determined in the same manner as in step 503, and if this is N, it means that the extension key has been operated in the on-hook state and in the loudspeaker mode. 522 and a transmitter on data set 523 for one calling ST, these control data are stored in the same RAM 23 as described above.

On the other hand, if step 503 is N, the process moves to reception data processing 1532 from the primary ST while performing other extension key operations/processing ``531''.

On the other hand, if step 502 is N, 1 extension key recovery?
'541 is judged, and if this is Y, is the 1 extension calling status as in step 503? ” 542, and depending on Y of this, 1 called ST
Speaker off data φ set〃551 and 1 called S
After performing T's transmitter on data set〃552, one call ST off-hook as in step 521?
'561, and assuming N of this, the speaker on data cell of 1 calling ST)' 562 and 1 calling S
T's transmitter off data set' 563 is performed, and these data are stored in RAM2 in the same way as steps 522 and 523.
However, if step 541 is N, other operation data/processing 1571 is performed.

Therefore, by transmitting 1 speaker-on data', ST
5W35 selects input A and the receiving loudspeaker circuit is turned on, and SW35 selects input B by transmitting ``1 speaker off data'' and the receiving loudspeaker circuit is turned off, while the ``transmitter off data'' The transmission of 〃 causes the MPX 38 of ST5 to select input 5.6 and the transmitter circuit is turned off, and the transmission of ``1 transmitter on data'' causes the MPX 38 to select inputs 1 to 4, and the transmitter circuit turns off. to turn on, step 502
If it is determined by Y of 521 and N of 521 that the extension key of the calling ST was operated in the receiving loudspeaker mode when the calling ST is on-hook, the speaker SP circuit is turned off and the transmitter T is turned off in steps 522 and 523. The circuit is turned on, and the on-hook transmitter T can transmit a message without producing any ringing due to acoustic coupling.

Further, if it is determined that the extension key is in the non-operated state in the receiving loudspeaker mode by Y in step 541 and N in 561, the process proceeds to steps 562 and 563.

The listen power SP circuit is turned on, the transmitter T circuit is turned off, and the speaker SP enters a receiving and amplifying state.

Correspondingly, in steps 511, 512 and 551, 552, the circuits of the speaker S and the transmitter T of the called ST are simultaneously controlled in opposite directions, so that the acoustic coupling on the called ST side is reduced. This also prevents noise generation.

XL, the extension key may not be used as a press talk button, but another key or a dedicated switch may be used, and similar control may be performed not only in the extension calling state but also after transitioning to the talking state.

In addition to the key telephone device, the present invention can also be applied to a single functional telephone, and each determination and control can be performed independently in the ST without being performed in the KSU1.

In addition, the configurations in Figures 1 and 2 can be arbitrarily selected depending on the situation, and in Figures 3 to 7, the steps may be replaced or other equivalent configurations may be used, depending on the conditions. Various modifications are possible, such as replacing them with , or omitting unnecessary ones.

〔Effect of the invention〕

As is clear from the above description, the present invention has a simple and inexpensive configuration, and allows the user to freely transmit using the handset's transmitter while on-hook in the loudspeaker mode, and is easy to operate. , remarkable effects can be obtained in various types of loudspeaker telephones.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Figure 1 is a block diagram of KSU, Figure 2 is a block diagram of ST, and Figures 3 to 7 are KSU block diagrams.
3 is a flowchart of processing status by CPUm of SU. 1---KS [j (main device), 2, ~2! lφ・work・
Outside line, 3, 31-3, *e 116 call line, 4
, 4T4o...signal line, 5...ST (button telephone), 11...TR8 (talk path switch), 12
．． 41...DSR (data transmitting/receiving circuit), 21...
Reference CPUm (main processor), 22...ΦCPU,
(Sub-processor), 23.25...RAM (variable memory), 24---ROM (fixed memory), 32,
34.35...Φ・sw (switch circuit), 33...
・DA (differential amplifier), 38 cases ・e・MPX (multiplexer), 42...CPU (processor),
4311...KB (keyboard), 44...PL
(indicator light group), R31~R-...Resistor, H8...ψ
・Hook switch, R...Telephone receiver, T...Transmitter, sp-@...Speaker. Patent applicant Tamura Electric Manufacturing Co., Ltd. Agent Masaki Yamakawa (and 2 others) Figure 3 Figure 4

Claims (1)

[Claims] In a receiving loudspeaker telephone set comprising a transmitter circuit and a receiver circuit for making a call in an off-hook state, and a receiving loudspeaker circuit for performing a loudspeaker reception in a loudspeaker mode in an on-hook state, a press that switches between sending and receiving according to an operation. a talk button, a determining means for determining the state of the press-talk button in the receiving loudspeaker mode, and turning on the transmitter circuit and turning off the receiving loudspeaker circuit when the determining means determines that it is in the operating state. and control means for turning off the transmitter circuit and turning on the loudspeaker circuit when the determining means determines that the telephone is in an inoperable state.