JPH038145B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a telephone on hold, and more particularly to a telephone on hold having a plurality of on hold melodies.

[Conventional technology]

Conventionally, this type of hold telephone has a front panel equipped with one hold button, and a hold melody to be generated by a hold operation is selected by a changeover switch provided on the bottom surface.

[Problems to be Solved by the Invention] For this reason, it is difficult to switch the melody on hold during a call, and it is necessary to select a desired melody in advance before starting a call. Furthermore, the selection operation itself required flipping the phone over, which was cumbersome.

[Means for solving problems]

The present invention provides a plurality of hold buttons corresponding to hold melodies, and controls the generation of hold melodies in a hold melody generation circuit according to the output of each hold button, and also controls the generation of hold melodies in a hold melody generation circuit according to the output of each hold button, and also controls the generation of hold melodies in a hold melody generation circuit according to the output of each hold button. Accordingly, a hold control means is provided for alternately setting and canceling the hold mode.

[Effect]

The hold button has the functions of a hold melody selection operator and a hold setting/cancellation operator, and if it is operated according to the hook state, that is, if it is operated while off-hook, it will be considered the latter, regardless of which hold button it is. The setting of the hold mode is alternately canceled with each operation, while the hold melody is changed by the operation during on-hook.

[Embodiment] The figure is a circuit diagram showing an embodiment of the present invention. In the figure, during off-hook, line terminals L1 and L2 connected to the telephone line from the exchange are
A communication circuit 2 is connected through the diode bridge 1 and the emitter-collector of the transistor Q1, thereby closing a DC loop for the telephone line. At this time, the transistor Q2 is forcibly turned on by the line current via the resistor R1, the meter contact of the switch HS1, the diode D1, and the resistor R2, thereby turning on the transistor Q1.

When making a dial call, the dial circuit 3 is in an operating state receiving power from the line current.
depending on the operation of dial key 4 on the keyboard.
A dial pulse is sent by sending a pulse from the PO output terminal and turning on and off transistor Q1 via transistor Q2. Note that when this dial signal is sent out, the output of the dial circuit 3 is applied to the MUTE input terminal of the telephone call circuit 2, and the handset is disconnected from the telephone line. Furthermore, during MF dialing, the MF signal sent from the output terminal of the dial circuit 3 is sent to the telephone line via the telephone call circuit 2, and
The confirmation tone is also sent to the handset and can be heard.

Next, the hold function will be explained. The present embodiment is provided with two hold buttons H1 and H2 for holding operations, which correspond to the first and second hold melodies generated by the hold melody generating circuit 5, respectively.

To shift from the call state to the hold state, by pressing any hold button in the off-hook state, a hold melody corresponding to the pressed button is sent from the hold melody generation circuit 5 to the telephone line via the call circuit 2. At the same time, the signal is output from the speaker circuit 6. That is, when transitioning from a call to hold, two operations are performed: setting a hold mode and selecting a hold melody, and for this purpose, a hold state control circuit and a hold melody selection circuit that constitute the hold control circuit 7 are used. and works.

First, by operating either the hold button H1 or H2, one input of the AND circuit AD1 becomes "H" via the diode D2 or D3. At this time, the other inputs of AND circuit AD1 are resistor R3,
Since it is set to "H" through the make contact of switch HS2 and resistors R4 and R5, its "H" output is input to flip-flop FF1. This causes flip-flop FF1
output becomes "L", the output of AND circuit AD2 becomes "L", transistor Q3 is turned off, and Q
4 is turned on and gives a MUTE input to the communication circuit 2. On the other hand, the Q output of flip-flop FF1 becomes "H", and as a result, the "H" output of AND circuit AD3 turns on transistor Q2 via diode D4, keeping transistor Q1 on and creating a complete hold state. do. The "H" output of AND circuit AD3 also activates hold melody generation circuit 5 and speaker circuit 6 via diode D5.

At the same time that the hold mode is set in this way, transistor Q5 or Q6 is turned on depending on whether the pressed button is H1 or H2.When the hold button H1 is pressed, flip-flop FF2 is reset, and when the hold button H2 is pressed, the corresponding flip-flop FF2 is reset. Flip-flop FF2 is set. As a result, when the hold button H1 is pressed, the output of the AND circuit AD4 becomes "L", and when the hold button H2 is pressed, it becomes "H", and by giving different inputs to the melody selection terminal MS of the hold melody generation circuit 5, A melody corresponding to each button is output.

Even if the transistor Q2 turns on in such a state, as mentioned above, the flip-flop FF
Since it is forcibly turned on by the Q output of 1,
The pending status will continue. In other words, in the hold state, the handset may be left off (off-hook hold) or returned to the hook (on-hook hold).

Next, in the state of on-hook hold, hold button H1
Alternatively, if H2 is pressed, the input signals of the hold buttons H1 and H2 do not appear at the output of the AND circuit AD1, since in this case the switch HS2 is grounded. Therefore flip-flop
The output state of FF1 does not change, and the pending state continues. However, if the input to transistor Q5 or Q6 indicates that the button is different from the previously pressed button, the output of flip-flop FF2 changes, and the selection of the pending melody changes. In other words, by pressing the hold button while on-hook is on hold,
The hold melody can be changed.

To cancel hold mode, press the hold button while in off-hook hold mode. When off-hook, the 1 of the AND circuit AD1 is
Since the input becomes "H", the input signal of the hold button is applied to flip-flop FF1. As a result, the Q output of flip-flop FF1 is inverted, the hold mode is released, and the call state returns. At this time, whether the hold button H1 or H2 is pressed, the hold mode is canceled in the same way. In other words,
There is no need to remember which button you pressed to put the call on hold and then press that button.

In this way, the hold button (H
1 or H2), the hold mode is alternately set and canceled, and the hold melody can be freely changed by operating the hold button in the on-hook state.

After canceling the hold mode, if the on-hook is performed, an "H" signal is output from the RS terminal of the dial circuit 3.
It is applied as a reset signal to the terminal of flip-flop FF1.

Above, an example has been described in which there are two types of hold melodies and two hold buttons are provided correspondingly, but the present invention is not limited to this.
The number of hold melodies and hold buttons may be three or more.

Although a semiconductor (transistor) switch for closing the call loop is used to maintain the hold loop, it goes without saying that a separate switch exclusively for the hold loop may be provided in parallel.

Further, although the description has been given using a single-function telephone as an example, the present invention can be similarly applied to a button telephone or the like.

〔Effect of the invention〕

As explained above, according to the present invention, a plurality of hold buttons are provided corresponding to the hold melodies, and generation of the hold melody is controlled according to the output of each hold button, and the logical sum output of each hold button during off-hook is output. By providing a hold control means for alternately setting and canceling the hold mode, the hold melody can be freely changed with a single button operation during a call (on-hook hold).

[Brief explanation of the drawing]

The figure is a circuit diagram showing one embodiment of the present invention. 5...Hold melody generation circuit, 7...Hold control circuit, H1, H2...Hold button, HS1, HS2...Hook switch.

Claims (1)

[Claims] 1. A hold melody generation circuit that selectively generates a plurality of hold melodies, and a hold melody generating circuit that selectively generates a plurality of hold melodies in a hold telephone that has an on-hook hold function that maintains a hold mode while on-hook, and sends a hold melody to a telephone line during the hold mode. A plurality of hold buttons are used to instruct the selection of the hold melody, and the generation of a hold melody in the hold melody generation circuit is controlled according to the output of each hold button, and the hold mode is set and A telephone on hold characterized by comprising a hold control means for alternately releasing the hold.