JP2835967B2 - Telephone - Google Patents

Description

Description: BACKGROUND OF THE INVENTION (1) Field of the Invention The present invention relates to a telephone capable of absorbing the vibration of a handset and the vibration of a main body while the telephone is on hold.

(2) Conventional technology The problem With this type of device, when the handset is raised or lowered, a malfunction may occur due to a chattering phenomenon that occurs when a so-called hook switch is turned on and off. A chatter monitoring time of several tens of milliseconds is provided to prevent this and to promptly transmit hook switch on / off information. On the other hand, when the hold state is released by the hook switch at the time of holding, the same time is set, so that the handset raises and lowers the vibration, that is, the hook switch intermittent due to the handset bounce and the chattering phenomenon due to the vibration of the main body malfunctions There was a drawback that the hold was released.

(3) Object of the Invention It is an object of the present invention to provide a telephone capable of preventing an erroneous operation of release from hold due to vibration caused by lifting and lowering of a handset.

(4) Configuration of the Invention In order to achieve the above object, the present invention increases the chatter monitoring time of the hook switch to about several hundred ms only when shifting from the call state to the hold state and when returning from the hold state to the call state. It is characterized by having done.

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, wherein 1 is a line connection terminal, 2 is a telephone circuit, 3 is a hold circuit, 4 is a control circuit for controlling the telephone circuit 2 and the hold circuit 3, and 5 is a hold button. , 6 are hook switches.

The operation of the circuit of FIG. 1 will be described with reference to the time chart of FIG. In FIG. 2, (A) is an input signal of a hook switch, (B) is an output signal to a telephone circuit, (C) is an input signal of a hold button, (D) is an output signal to a hold circuit,
(E) is a hold signal, and t ₁ and t ₂ are chattering monitoring times. In the phone in the standby state, the feeding lift the handset (the off-hook) hook switch 6閉結, hook switch signal (A) becomes a low level, false course of chatter monitoring time t _1, the output to the telephone circuit 2 ( B) goes high, and a call loop with the line is formed. In this case, chattering monitoring time t ₁ controls the connection terminals of the line 1, and early response as a short monitoring time of several 10ms for voice communication becomes loop formation state.

Next, in the call state after the connection with the other party is completed by the other party response after dialing, the hold button 5
Is pressed, the input signal (C) of the hold button 5 momentarily goes low, the output signal (D) to the hold circuit 3 goes high, and the off-hook hold state is set. In this off-hook hold state, put down the handset (on-hook)
Hook switch signal (A) for releasing the hook switch 6
Becomes high level, and the chattering monitoring time t ₂ (Equation 10)
After 0 ms), it goes into the on-hook hold state.

In this case, chattering monitoring time t ₂ changes the number 100ms and the time width from a few 10ms of t _1, a long interruption time caused by vibration or the like, off-hook hold → hook hold → call → in the waiting and instantly The state is changed to prevent the connection terminal to the line 1 from being opened.

Next, in the on-hook hold state, the hook switch signal (A) becomes low level by lifting the handset (off-hook) and closing the hook switch 6, and after the elapse of the chattering monitoring time t ₂ (several hundred ms), The hold is released and communication with the line is resumed.

In this case as well, a time of t ₂ (several hundred ms) is provided in the same manner as described above, so that the on-hook hold → call → standby instantaneously prevents opening of the connection terminal with the line 1.

Then, the hook switch signal (A) becomes high level by opening the hook switch 6 in call state, after a chattering monitoring time t _1, a standby state at an earlier response.

The specific configuration and operation of the circuit shown in FIG. 3 will be described.

Operation of the incoming circuit The incoming circuit is always connected to L ₁ -L ₂ , and when an incoming signal is sent, it is full-wave rectified by the CD ₂₄ , passes through the LED, is given to the VCC of the tone ringer IC, and at the same time TR ₉ Turns ON to drive the buzzer S (sounder).

In addition, the incoming call sensitivity and incoming sound quality are each 2 by DIP-SW.
The ring volume can be switched to three stages by the slide SW.

CD ₃ is an LED reverse voltage protection diode, and CD ₂₀ is a tone ringer IC overvoltage protection varistor. TR ₉ is to prevent the tone ringer IC from becoming a load when sounding BEEP or the like.

Electronic hook circuit a) Activation by hook SW When the handset is raised from the standby state, contacts AB, CD of the hook switch (HS) are opened, and the circuit closing circuit LS is operated by make of AB. . As a result, current is supplied to the speech network NW (IC), and a DC loop is formed. Also the contacts C-D of the hook switch HS is make, "L" next through the microcomputer CPU ▲ ▼ is TR _13, detects that the microcomputer CPU is off-hook mode, and the LOOP "H", the line closed The operation of supplying current to the connection circuit LS is maintained.

It should be noted, TR ₁₃ for the CPU malfunction prevention of when you start from the initial state, the input signal after the V _DD rises to complete ▲
▼ is inserted so that when the line is disconnected while off-hook, HS is set to “H” to prevent current loss due to internal pull-up.

b) Activation by SP button When the SP button in the keypad described below is pressed in the standby state, the microcomputer CPU changes from the sleep mode to the operation mode and starts the key scan. Here, when the press of the SP button is detected, LOOP is set to “H” and the reclosing circuit LS operates,
A DC loop is formed.

Dial circuit a) DP sending circuit When the dial button is pressed in the DP mode, the DP repeats PH-L by the number corresponding thereto. As a result, the line connection circuit LS repeats OFF-ON.

b) PB transmission circuit When the dial is pressed in the PB mode, 2
The frequency is output from TONE-OUT of the microcomputer CPU. This is divided by a resistor on the way, and one is BI of the speech network NW
Is input to the MFI of the speech network NW and is output to the circuits L ₁ and L ₂ via the VL and the line connection circuit LS.

Hold circuit When the hold button HD is pressed during a call, the microcomputer CPU detects it and sets HDA to “L”. This allows V _{DD to be} added to the melody IC.
The voltage between -GND is secured and the melody is output from the melody IC MO. Subsequent transmission and confirmation sounds are the same as PB transmission.

Also, even if the handset is placed, the microcomputer CPU L
The line is not disconnected because OOP holds “H”.

When KEY TONE circuit and BEEP circuit microcomputer CPU KT and BEEP is output at 2KHz, signal 2KHz is given to 600Ω side of repeated T ₃ each ON-OFF is TR ₁₈ accordingly. As a result, about 3KΩ
The voltage is doubled to drive the buzzer S (sounder).

Power circuit E of the power supply circuit phone is than four configurations of the power supply E ₄ ...... low current circuit ₃ ...... DP during make-backup power supply E when power E ₂ ...... stand by E ₁ ...... AAA batteries During normal operation, it is maintained at about 3 V by a low-current circuit of E4, and AAA batteries are mainly used as a power supply for memory backup.

R-UP circuit The output unit RUP of the microcomputer CPU when the receiving volume switching button UP is pressed becomes high (H) -low (L), and the amount of negative feedback from the RC of the speech network NW is the receiving gain adjusting circuit R-UP.
, The gain of the amplifier is increased, so that the reception sound volume is increased.

In addition, the reception sound volume is reset in the case of dialing, ending the call, holding, and the like, and returns to the state of low reception sound volume.

Imaginary ground (IM-GND) circuit After the LOOP of the microcomputer CPU is closed and the transfer signal is received, the microcomputer CPU momentarily sets the IM-GND circuit to L. At this time, the setting by the DIP-SW (for example, as shown in the figure) TEL ₁ / TE
L ₂ , DP / PB, 02/10, OAP / OFF) is read by the microcomputer CPU and D
Performs the function operation according to the IP-SW setting.

Branch Bell Circuit a) Sending Circuit When the buttons of the dials 1 to 3 are pressed in the hold mode, an output signal corresponding to the dial button is output from the SO of the microcomputer CPU. At the same time, a synchronization signal is output from SCK. SCK inversion signal and SO pending transfer unit HT
AND circuit AND output is input to TR17 base and V
The transmission pulse from L is transmitted to the lines L ₁ and L ₂ via the line closing circuit LS.

b) Receiving circuit Other telephone (not shown) of the branch partner in the standby state
When from VL sends a transmission pulse, the primary side of T ₁ through C ₅₂ (1
10Ω). Then about 1 on the secondary side (11KΩ)
It appears as a voltage of 0 times and a signal is sent to the hold transfer unit HT.

In the hold transfer unit HT, to detect that the time difference between the rising signal and the falling signal is the width of the pulse, the window is opened by the signal input first and the next signal is sent only within a certain time (pulse width). Signal is not passed. As a result, noise is removed. Waveform shaping of the passed signal is compared with SCK (system lock) to recognize data.

c) Transfer data The transfer data is sent according to the pattern shown in Fig.
When the data matches with a probability of 2/3, the signal is received at the timing shown in FIG. 4 (b), the reception is OK, and BEEP is output.

Configuration of Keypad The keypad has the following configuration as an example.

(5) Advantageous Effects of the Invention As described above, according to the present invention, there is an advantage that a malfunction due to a bouncing of the handset and a vibration of the main body can be prevented by setting the holding time longer than the chattering monitoring time in another state during the hold.

[Brief description of the drawings]

1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a time chart for explaining the operation of the embodiment of FIG. 1,
FIG. 3 is a connection diagram showing a specific circuit example of the present invention, and FIG. 4 is a time chart for explaining the operation of the specific example of FIG.

Continued on the front page (73) Patent holder 999999999 Meisei Electric Co., Ltd. 2-57-7 Koishikawa, Bunkyo-ku, Tokyo (72) Inventor Yuichiro Mitsutake 1-7-141 Kugayama, Suginami-ku, Tokyo Iwasaki Tsushinki Co., Ltd. (72) Inventor Katsumasa Izumi Katsuyama, Suginami-ku, Tokyo, Japan 7-41 Iwasaki Tsushinki Co., Ltd. (72) Inventor Kenzo Masuoka 1-6-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Kimitoshi Nakamura 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Masanori Tanaka 3-1-1 Asahigaoka, Hino-shi, Tokyo Inside the Toshiba Hino Plant (72 ) Inventor Kazuhiro Izuka 3-1-1 Asahigaoka, Hino-shi, Tokyo Inside Toshiba Hino Factory Co., Ltd. (72) Inventor Tetsuya Imabori 2-23-2 Nishigotanda, Shinagawa-ku, Tokyo Kanda Communication Industry Co., Ltd. (72) Inventor Michio Shiba 2-23-2 Nishigotanda, Shinagawa-ku, Tokyo God Inside Telecommunications Industry Co., Ltd. (72) Inventor Takahisa Arai 2-5-7 Koishikawa, Bunkyo-ku, Tokyo Meisei Electric Co., Ltd. (72) Inventor Kenichi Shiina 2-5-7 Koishikawa, Bunkyo-ku, Tokyo Meisei Electric (56) References JP-A-62-216120 (JP, A) JP-A-63-10946 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04M 1/00

Claims (1)

(57) [Claims] The chattering monitoring time is set to about several hundred milliseconds when the mobile phone goes on-hook after transitioning from the hold state to the hold state and when the mobile phone goes off-hook to return from the hold state to the talk state. A telephone set characterized in that the chattering monitoring time is set to about several tens of milliseconds so that hold release due to vibration caused by raising and lowering the handset can be prevented.