JPS61212954A - Telephone set incorporating modulator and demodulator - Google Patents

Abstract

PURPOSE:To eliminate the need for mode setting operation by providing a control circuit setting automatically the mode in response to outgoing and incoming operation. CONSTITUTION:The data communication state is attained by operating a communication switch DCS 17 and a transmission data signal is sent to a telephone line from the transmission output Ds of a switching circuit CHC12B via a talking circuit TKC2 and a reception data signal is given to a reception input DR. An MODEM 11A has the 1st and 2nd modes in response to the operating carrier frequency and any mode is set in response to the mode selection signal MS from the control circuit CNT 16. The opposite mode is set at transmission and reception.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a telephone with a built-in modulator/demodulator.

[Conventional technology]

In recent years, telephone devices have been developed that incorporate a modem (hereinafter referred to as MODEM) into the telephone and integrate call and data communication functions, especially acoustic cups.

It does not require a line network control device, is easy to operate, and can freely communicate data via telephone lines.

Note that some MODEMs have a first and second mode defined for operation depending on the carrier frequency, and this MODEM
If EM is built-in, before starting data communication,
Either mode is set for transmission by manual operation.

[Problem that the invention seeks to solve]

However, setting the mode is done through a telephone meeting or based on an agreement with the other party, which makes setting operations cumbersome and can lead to problems such as confusion in the communication status due to incorrect settings. are doing.

[Failure to solve the problem]

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

That is, a control circuit is provided that automatically sets one of the first and second modes based on the outgoing operation, and automatically sets the other of the modes in response to the incoming call operation. It is something that

[Effect]

Therefore, when a call is made, the first mode is set based on this, and when a call is received, the second mode is set, and these settings are automatically set on each opposing telephone. It will be carried out in

〔Example〕

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

Figure 1 is an overall block diagram of the line terminal L+.

Hook switch H8'' connected in parallel to L2, relay contact rt1, diode bridge DJ, and switch circuit for dial pulse transmission (hereinafter referred to as '1')
A communication circuit (hereinafter referred to as TKC) 2 which is an integrated circuit is connected in series through the saD 1, which includes a human power transmitting terminal (hereinafter referred to as Ti) 201 and a receiving output terminal (hereinafter referred to as Ro).
) 202, receiving amplifier input terminal (hereinafter referred to as RAi)
203, and a receiving amplifier output terminal (hereinafter referred to as RAo)
204 is provided, and Ro202 and RA12!13 are connected by contact rt2, and the receiver R is connected to the positive terminal of RAO204 and TKC2 (hereinafter referred to as
Vc) 205, and a self-generating transmitter T such as a dynamic type or a capacitor type is connected to the common side terminal of Ti202 and TKC2 via contacts S1 and rt2 and a switch circuit (hereinafter referred to as 8 stations 3). (hereinafter referred to as COM)
206, and the output of the transmitter T is
It is applied between i201 and C0M2O6, amplified by the internal transmitter amplifier, and then applied to Vc205 and C0M206.
206, while Vc 205 and c.

The received voice signal applied between M2O6 receives a sidetone prevention effect and appears at Ro202, and is transmitted to RAi203 and RAo.
204 and is amplified by a receiving amplifier between
It is sent between RAo 204 and Vc 205, and the receiver R
It becomes the thing that drives the.

Note that each amplifier in the TKC 2 operates using loop current from the telephone line as a power source.

Furthermore, on the output side of the diode bridge DB, an integrated dial circuit (hereinafter referred to as DIC) 4, which also operates using part of the loop current as a power supply, connects Sdi 1 and T
The drive circuit (
Hereinafter, the DIC 4 controls the Sdi 1 via the DRV (DRV) IA, turns it off and on, and sends out dial pulses. Based on the number dialed immediately before, 5dll is controlled again according to this number and a redial call is made.However, there is a switch between DIC4 and DIK5.
Since y is inserted and υ is turned off during data communication, dialing is impossible. A tone ringer (hereinafter referred to as TRG) 9 is connected as a bridge, and TRG 9 drives speaker sp in response to the arrival of a calling signal, thereby notifying the incoming call.

On the other hand, for example, 1200bit/sec and 300bit/sec
MODEM 11 A with different communication speeds with see
, 11B are provided, and switching circuits (hereinafter referred to as CHC) 12A and 12B are interposed on both sides of the CHC.
12A is connected to a data terminal equipment (hereinafter referred to as DTE) 14 via an interface (hereinafter referred to as I/F), and CHCl2A and 12B respond to the operation of a communication speed selection switch (hereinafter referred to as 5S) 15. , MODEMll
Either one of A, 11B is to be selected.

In addition, processors such as microprocessors (hereinafter referred to as CP)
U) and a control circuit (hereinafter referred to as CNT) consisting of memory, etc.
16 is provided, MODEM is set by the output of 8815.
In addition to determining the selection status of 11 A and 11 B,
When the communication switch (hereinafter referred to as DC8) 17 is operated, CN
T16 will respond and set the data communication status.p
, CHCl2B to allow the data signal to pass through, while relays RLI, RL2 and SW7
, the contacts rt2 and rt2 switch to drive the TKC2 T
CHCl2B transmission output D to i201 and Ro202
s and reception input DR are connected to each other, and the contact rt
1' operation connects line terminal L1 and TKC2 regardless of the state of hook switch H81, and closes the DC loop, and turns off DIK by turning off SW7.
5 is disabled to prevent dialing from interfering with data communication.

Therefore, after dialing off-hook, the town
After going off-hook in response to an incoming call, use the transmitter T and receiver R to talk to the other party, and for data communication, operate the DC817 to enter the data communication state. ) signals and other transmitted data signals are C
A similar received data signal is transmitted from the transmit power Ds of HCl2B to the telephone line via TKC2.
The signal is applied from the telephone line via TKC2 to the reception input DR of CHCl2B, thereby allowing the DTE 14 to transmit and receive data signals.

Also, if you do not go off-hook in response to an incoming call,
In response to the RDT 8 detecting the arrival of the ejection signal, the CNT 16 responds based on its detection output and transmits a carrier detection (hereinafter referred to as CI) signal to the DTE 14 via the I/F'13. When the CNT 16 sends out a ready (hereinafter referred to as ER) signal, the CNT 16 sets the data communication state and automatically receives data communication.

It should be noted that during automatic reception, the CNT 16 drives the SW7, so even if the DIK5-= or redial key 6 is operated, the DIC4 does not respond and no dialing is performed.

In addition, the DIC4 has a dialing function using not only pulse dialing but also composite voice frequency (hereinafter referred to as MF) signals. DP”
and MF signal "'MF" are selected, and MF
When double signal is selected, DIC
4 drives sw3 with the mute signal MUTE, and Ti2 of TKC2 is transmitted through the correction circuit (hereinafter referred to as REV) 4A.
After connecting the MF double signal output to 01, setting the level and reducing harmonic components using REV4A,
The MF multiplied signal is transmitted via TKC2.

In addition, a hold key is provided in KB18, and a hold circuit (not shown in the diagram) is also provided.When the hold key 17 is operated, the hold circuit closes the DC loop regardless of the state of the hook switch H8. Relay R
Drive L3 and connect hold tone generation circuit (hereinafter referred to as HTG) 19 to T1201 of TKC2 through contact rt3.
A hold tone such as a melody generated by the TG 19 is sent from the TKC 2 to the telephone line.

On the other hand, between the contact rt1' and the hook switch H8' and on the diode bridge DB side, there is a partner response detection circuit (hereinafter referred to as ASD) 21 that detects polarity reversal of the loop current.
is inserted, and 8S1 via CHCl2B
A watchdog circuit (hereinafter referred to as WDC) 22 is provided to which clock pulses and data signals from MODEM 11A or 11B selected by MODEM 11A or 11B are provided. The detection forces of the WDC 22 and the WDC 22 are given to the CNT 16, and the CNT 16 responds to them. MODEMllA also has a first mode and a second mode depending on the frequency of the carrier wave used. , the situation is as shown in the table below.

Therefore, mode selection (hereinafter referred to as MS) from CNT19
) Mode 1 or 2 is set depending on the signal, and transmission is performed using the frequencies shown in the table above, and signals are received using the opposite frequency to the set mode.

However, the mode can be set manually or automatically.
, ``2'' and ``mode automatic'' keys are provided on each side. ``Mode 1'', [2, l key 1 is used to manually set the mode, and the ``mode automatic'' key is used to automatically set the mode. A mode setting is done.

Furthermore, the KB18 is equipped with a "speaker key" for the on-hook monitor circuit, which is omitted in the diagram.When operated, the DC loop is closed, and monitoring using the amplifier and speaker becomes possible. The key to select the connection status on the MODEM side by driving relays RLI and 2 is also K.
It is provided in the BI, and has keys for ``manual connection IJr2J'' and ``auto connect''. In this case, the relay RL1 is driven by the operation of the speaker key, and the relay RL2 is also driven in response to the operation of the DC817.

However, in the case of "manual connection 1", the drive of the relay is stopped in response to the ER double signal stop, and in the case of "manual connection 2", the drive of the relay is stopped in response to the reset of DC811. .

FIG. 2 is a flowchart of the control situation by the CPU in the CNT 16. All relays are deactivated and flags are reset by "Initialize" 101, and "Manual connection 1 or 2" is set according to the data in the memory. ?
``Determine 102, and if this is Y (YES), 11 off-hook to the status of hook switch H8?'' After determining 111, p'' speaker is determined by the data in memory via N ('No) of this. Key operation?'' 112 is checked, and relay ``RLI drive'' 113 is activated in response to Y of this to close the DC loop.

Next, make a white dial call by operating DIK5? ″12
If 1 becomes Y, "Set outgoing flag" 122 is performed, and as "DC8 operation?" 123 becomes Y, "Mode 1?" 131 and "Mode 2" are set depending on the data in the memory. ?” 132, and if both are N, “mode automatic” is set. ”
133, and when this is N, perform 6 mode 2 setting" 141, while when step 133 is Y, perform 6 mode 1 setting" 142, send out the MS signal according to these, and then set the relay. "RLI, 2 drives"
143, connect the MODEM side to the telephone line, and
When it is "Manual connection 1", the ER double signal is stopped, and when it is "Manual connection 2", it is reset by DC817.
°Communication ended? As ``'144 becomes Y, return to step 1 old.

Note that if step 111 is Y, step 1 is immediately executed.
On the other hand, in response to Y in step 131, the process proceeds to step 142, and in response to Y in step 132, the process immediately proceeds to step 141. At this time, step 133 is not involved, and mode setting is performed manually.

Regarding the above, if step 102 is N, "Automatic connection"
Wow, similar to step 121 “dial call?” 1
Detection of incoming call by the detection power of RDT8 through N of 51? If ``152'' is Y, perform ``mode 2 setting'' 161 in the same way as step 141, and then set relay ``R''.
LI, 2 drive ``162 closes the DC loop and connects the MODEM side, and when the ER multiplier signal is stopped and the repa communication ends?'' 163 becomes Y, the process returns to step 101.

Further, if step 151 is Y, the detection force of the ASD 21 is generated in response to the reversal of the polarity of the loop current due to the response from the other party, and 'response from the other party?' If ``''1T1 becomes Y, "mode 1 setting" 172 is performed in the same manner as step 142, and the process moves to step 162.

So for "auto connect" and "manual connect"
However, if "Mode Auto" is selected, "Mode 1" will be automatically set based on the dialing operation etc.
"Mode 2" is similarly set in response to an incoming call operation such as the detection of an incoming call, thereby omitting the mode setting operation and preventing erroneous settings.

In addition to operating each digit of DIK5, the transmission and transmission operations are
Redialing, automatic dialing, character dialing on the DIE 14 side, line capture operations, etc. may be used, and in addition to L incoming call detection as incoming call operations, response operations when dialing is not performed, DC 817 operations, and DTE 14 side The same thing can be done using a line acquisition request signal or the like.

In addition, the timing for automatically setting the mode is that after determining the mode, this information is stored in memory and
The mode may be set after the M side is connected, and the setting conditions for modes 1 and 2 may be reversed from those in FIG. 2.

Note that the CNT 19 may be configured by combining various logic circuits without using a CPU, and in FIG.
The present invention can be modified in various ways, such as replacing steps, replacing steps with equivalent steps, or omitting unnecessary steps depending on conditions.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, the mode setting is automatically performed both when making a call and when receiving a call, thereby omitting the setting operation and preventing mistakes in setting. There is no risk of this occurring, and remarkable effects can be obtained in various telephones that incorporate MODEM.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, with FIG. 1 being a block diagram of the entire configuration, and FIG. 2 being a flow chart of the control situation. 2...TKC (telephone circuit), 4...φ・DIC (dial circuit), 5...DIK (dial key), 8
...RDT (incoming call detection circuit), 11A. 11B φ...MOD EM (modulator/demodulator), 16
@・--CNT (control circuit), 17・@e-DC8 (communication switch), 18・@llΦKB (keyboard), H
8, I(S...Hook switch, RLI~RL
3Φ medium - relay, T41, rt2, rt
2, T13...Contact.

Claims (1)

[Claims] In a telephone equipped with a built-in modem having first and second modes according to the frequency of the carrier wave used, one of the modes is automatically set based on the outgoing operation, and the other mode is automatically set depending on the incoming call operation. 1. A telephone with a built-in modulator and demodulator, characterized in that a control circuit is provided for automatically setting one of the modes.