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US 5,850,431 AGranted
Facsimile/voice phone combined device producing DTMF oscillation sound when pushing fax dial buttons
AssigneeBrother Kogyo Kabushiki Kaisha
InventorTatsuya Satou
Life of this patent
Estimating the term…
Abstract
In a facsimile/voice phone combined device of the type having a line interface circuit that includes a transformer for separating an electrical coupling between a telephone line and the combined device, the operator can push dial buttons while hearing the DMF oscillation sound from the speaker. When a dial button provided on a keyboard of a facsimile section is pushed, the first change-over switch connects the output terminal of a modem in the facsimile section to the line interface circuit, and the second change-over switch connects the speaker of a handset to the line interface circuit so that the DTMF signal from the modem is applied not only to the telephone line through the line interface circuit but also to the speaker.
Claims14
A facsimile/voice phone combined device comprising:
- a facsimile section including dialing means for an operator inputting phone numbers, and a modem having an input connected to said dialing means, an outgoing fax line, and an incoming fax line, wherein said modem outputs to the outgoing fax line a dual tone multi frequency signal corresponding to a phone number input with said dialing means;
- a telephone section including a handset, said handset having a microphone for producing an outgoing voice signal and a speaker;
- a line interface circuit having a terminal connected to a telephone line, a transmission terminal, and a reception terminal, said line interface circuit including a transformer for separating an electrical coupling between the telephone line and said facsimile section or between the telephone line and said telephone section;
- first switching means for connecting the outgoing fax line of said modem to the transmission line of said line interface circuit when the operator inputs the phone number with said dialing means;
- and
- second switching means for connecting the speaker to the transmission line of said line interface circuit when the operator inputs the phone number with said dialing means, whereby the dual tone multi frequency signal is reproduced at the speaker only when the operator is inputting the phone number with said dialing means and said second switching means disconnects the speaker from the transmission line upon completion of the dialing.
3 more elements
A facsimile/voice phone combined device comprising:
- a handset having a microphone for producing an outgoing voice signal and a speaker;
- a hook switch selectively rendered ON and OFF, said hook switch producing an ON signal when an operator picks up said handset and an OFF signal when the operator hangs up said handset;
- dialing means for an operator inputting phone numbers;
- a modem having an input connected to said dialing means, an outgoing fax line, and an incoming fax line, wherein said modem outputs, on the outgoing fax line, a dual tone multi frequency signal corresponding to a phone number input with said dialing means;
- a line interface circuit including a transmission terminal, a reception terminal, and a transformer having a primary winding connected to a telephone line and a secondary winding connected to the transmission terminal and the reception terminal;
- first switching means having a first terminal and a second terminal, the first terminal of said first switching means being connected to the transmission terminal of said line interface circuit;
- second switching means having a first terminal and a second terminal, the first terminal of said second switching means being connected to the reception terminal of said line interface circuit;
- and
- control means, responsive to the ON signal, for controlling said first switching means so that the second terminal of said first switching means is connected to the outgoing fax line of said modem, and for controlling said second switching means so that the second terminal of said second switching means is connected to the speaker, whereby the dual tone multi frequency signal is reproduced at the speaker only when the operator is inputting the phone number with said dialing means and said second switching means disconnects the speaker from the transmission line upon completion of dialing.
6 more elements
A facsimile/voice phone combined device comprising:
- a handset having a microphone for producing an outgoing voice signal and a speaker;
- a hook switch selectively rendered ON and OFF, said hook switch producing an ON signal when an operator picks up said handset and an OFF signal when the operator hangs up said handset;
- dialing means for an operator inputting phone numbers;
- a modem having an input connected to said dialing means, an outgoing fax line, and an incoming fax line, wherein said modem outputs, on the outgoing fax line, a dual tone multi frequency signal corresponding to a phone number input with said dialing means;
- a line interface circuit including a transmission terminal, a reception terminal connected to both the speaker and the incoming fax line of said modem, and a transformer having a primary winding connected to a telephone line and a secondary winding connected to the transmission terminal and the reception terminal;
- first switching means having a first terminal and a second terminal, the first terminal of said first switching means being connected to the transmission terminal of said line interface circuit;
- second switching connected between the reception terminal of said line interface circuit and a speaker, and
- control means, responsive to ON signal, for controlling said first switching means so that the second terminal of said switching means is connected to the outgoing fax line of said modem, and for controlling said second switching means so that the reception terminal of said line interface circuit is connected to the speaker, whereby the duel tone multi frequency signal is reproduced at a speaker only when the operator is inputting the phone number with said dialing means and said second switching means disconnects the speaker from the transmission line upon completion of dialing.
5 more elements
Dependencies are inferred from the claim text.