CN1169634A - Facsimile receiving circuit - Google Patents
Facsimile receiving circuit Download PDFInfo
- Publication number
- CN1169634A CN1169634A CN97110557A CN97110557A CN1169634A CN 1169634 A CN1169634 A CN 1169634A CN 97110557 A CN97110557 A CN 97110557A CN 97110557 A CN97110557 A CN 97110557A CN 1169634 A CN1169634 A CN 1169634A
- Authority
- CN
- China
- Prior art keywords
- resistance
- operational amplifier
- signal
- transformer
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/327—Initiating, continuing or ending a single-mode communication; Handshaking therefor
- H04N1/32704—Establishing a communication with one of a facsimile and another telecommunication apparatus sharing a single line
- H04N1/32706—Type of the other apparatus
- H04N1/3271—Telephone answering machine
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/327—Initiating, continuing or ending a single-mode communication; Handshaking therefor
- H04N1/32704—Establishing a communication with one of a facsimile and another telecommunication apparatus sharing a single line
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/327—Initiating, continuing or ending a single-mode communication; Handshaking therefor
- H04N1/32704—Establishing a communication with one of a facsimile and another telecommunication apparatus sharing a single line
- H04N1/32715—Detecting
- H04N1/32719—Detecting a facsimile calling signal, e.g. CNG
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimiles In General (AREA)
- Telephonic Communication Services (AREA)
- Facsimile Transmission Control (AREA)
Abstract
The present invention discloses a facsimile receiving circuit, with a transmitting element to send voice message, and receive image data when a call tone is received from the telephone network by a receiving unit is detected, so as to improve the call tone detecting capability. The circuit comprises a transformer that converts the telephone network signals and then sends the signals to the receiving unit; a loading resistor connected to the transformer; a first operational amplifier that makes the output of the transmitting element transmit to the loading resistor after amplification by the first resistor and the second resistor connected in series; a second operational amplifier with one end connected to the transformer through a third resistor and connected with a fourth resistor, and with the other end grounded through a sixth resistor and connected with the first operational amplifier through a fifth resistor, so as to transmit the amplified call tone to the receiving unit.
Description
The present invention relates to a kind of receiving circuit of facsimile machine, more particularly, relate to a kind of facsimile receiving circuit that when speech information is replied in transmission automatically, improves detection of call sound ability.
Recently, office automation (OA) equipment all needs to satisfy multi-functional requirement, and this shows that significantly trend is that the multipurpose product is more welcome than " single functional product " at present.At present the various facsimile machine products of selling have on the market all possessed multiple additional function, file copy function for example, with speech information automatically reply function and store the function etc. of speech information when receiving bell signal.
Referring to Fig. 1.General facsimile receiving circuit comprises: speech information transmitting element 50; Modulator-demodulator 60 is used for modulation; Transformer T1 receives from the plug tip end of public telephone network and the signal of plug ring end for conversion; Load resistance R1 connects one of them output of transformer T1; Switched circuit 30, the output and the modulator-demodulator 60 of the message of answering breath transmitting element 50 are to carry out switch operating; First resistance R 2 connects switched circuit 30; Second resistance R 3 is connected in series with first resistance R 2; First operational amplifier 10 (transmitting element operational amplifier), one input termination first and second resistance R 2, R3, its another input end grounding, thus export to load resistance R1 again after the output of above-mentioned speech information transmitting element 50 amplified; The 3rd resistance R 4 connects the connected node 5 of above-mentioned transformer T1 and load resistance R1; The 4th resistance R 5 is connected in series with the 3rd resistance R 4, second operational amplifier (receiving element operational amplifier), and one input termination the 3rd resistance R 4, its another input end grounding is exported away thereby input signal amplifies again; With inspection sound unit 40, its input connects the output of above-mentioned second operational amplifier 20, and its output connects the input of above-mentioned modulator-demodulator 60, thereby detects the calling tone (CNG) that above-mentioned second operational amplifier 20 sends.
When using above-mentioned inside that the facsimile machine of automatic answering phone is housed, detected bell signal when coming in, debit's the facsimile machine stored speech information of just resetting, send it to calling party, when calling party was wanted to send pictorial data, its facsimile machine just sent calling tone according to above-mentioned speech information to receiver.
At this moment, debit's facsimile machine detects the calling tone that calling party is sent, and just sends out speech information according to the bell signal of coming in, thereby changes the state of receiving faxes over to.
Like this, because the receiving element Rx of facsimile machine must receive CNG and speech information signal simultaneously, promptly speech information and CNG signal are input to inspection sound unit 40 at synchronization, thereby have reduced the calling tone detectability of inspection sound unit 40.
The purpose of this invention is to provide a kind of facsimile receiving circuit that improves the voice signal detectability, sort circuit only allows the CNG voice signal of public telephone network be input to receiving element Rx when receiving speech information signal and CNG signal at the same time, thereby speech information signal (being the output signal that transmitting element Tx sends) is stopped up.
Facsimile receiving circuit of the present invention comprises: transformer T1, and the input signal that comes for the above-mentioned public telephone network of conversion sends it to above-mentioned receiving element again; Load resistance R1, its input connects the output of above-mentioned transformer T1, thus the voltage of control load; First resistance R 2 and second resistance R 3, both are connected in series, and the speech information signal that above-mentioned speech information transmitting element Tx sends is promptly by resistance R 2 and R3; First operational amplifier 10, an one input connect the connected node 9 of above-mentioned first and second resistance R 2, R3 selectively, its another input end grounding, thus export to above-mentioned load resistance R1 after above-mentioned speech information signal amplified; With second operational amplifier 20, an one input divides two-way, a kind of the 4th resistance R 5 that connects, another Lu Jingdi three resistance R 4 meet above-mentioned transformer T1, its another input is through the 6th resistance R 7 ground connection, connect the output of above-mentioned first operational amplifier 10 simultaneously through the 5th resistance R 6, thereby send the calling tone signal that amplifies to above-mentioned receiving element Rx.
Referring now to accompanying drawing, only is described more specifically content of the present invention with way of example.
Fig. 1 is the block diagram of prior art facsimile receiving circuit.
Fig. 2 is the detailed circuit diagram of facsimile receiving circuit of the present invention.
General facsimile receiving circuit shown in Figure 1 is that with the different of facsimile receiving circuit of the present invention shown in Figure 2 circuit of the present invention has been set up the 5th resistance R 6 between node 3 and node 7, has set up the 6th resistance R 7 between node 7 and ground terminal.
The output impedance of above-mentioned first operational amplifier, 10 outputs is zero because of the characteristic of operational amplifier itself.Therefore, this output can be considered ground connection (virtual earth).In addition, above-mentioned load resistance R1 can regard the resistance that connects two secondary terminals of transformer T1 as.Load resistance R1 can be considered the load resistance of transformer T1.The coil of transformer T1 is during by 1: 1 turn ratio coiling, and the AC impedance of primary side equals load resistance R1, thereby load resistance R1 is depended in this impedance.Usually, connect the terminal equipment of distribution panelboard, desirable 600 henries of its AC impedance.
Above-mentioned output signal Tx sends public telephone network to by transformer T1 after first operational amplifier 10 (i.e. the operational amplifier of Tx signal is amplified in gain) amplifies.Like this, the signal magnification factor of first operational amplifier 10 is Av=-(R3/R2), thereby V2 equals-(R3/R2) V
TX, wherein "-" number expression paraphase.
The signal value V3 that makes above-mentioned output signal Tx return to the output voltage V 3 of receiving element Rx is not only determined by R4 and R5, is also determined by R6 and R7.Therefore, if control these resistance values to such an extent that make R5/R4 equal R7/R6, the output voltage V 3 of then above-mentioned receiving element Rx is with respect to transmission voltage V
TXHas minimum value.
In other words, in sum, when circuit design of the present invention must make the value of the output signal Tx that turns back to receiving element reach minimum, can detect the receipts that send out to come in during the speech information signal from the CNG of public telephone network sound.In addition, the receipts of coming in are to utilize third and fourth resistance R 4, R5 amplifier from the signal of public telephone network, thereby can input to receiving element Rx and irrelevant with the 5th and the 6th resistance R 6, R7.
The present invention can improve the CNG voice signal detectability of facsimile receiving circuit greatly, this is because when transmission speech information signal carries out simultaneously with reception CNG signal, on the one hand avoid the speech information signal to transport in the receiving element as far as possible, will receive on the other hand to be amplified and reach from the CNG of public telephone network signal.
Claims (3)
1. the facsimile receiving circuit of the facsimile machine of automatic answering phone is equipped with in an inside, on the one hand in order to send the speech information signal by the speech information transmitting element, on the other hand in order to when detecting the public telephone network calling tone signal that receiving element receives, to receive pictorial data, it is characterized in that it comprises:
A transformer, the signal for the conversion public telephone network is sent sends it to described receiving element again;
A load resistance, the output of the described transformer of its input termination is used for control load voltage;
First operational amplifier, for first resistance and second resistance of output signal that allows the speech information transmitting element send by being connected in series, an one input connects the connected node of first resistance and second resistance selectively, its another input end grounding, thus described load resistance exported to after described output signal amplified; With
Second operational amplifier, an one input connects parallel simultaneously the 4th resistance that connects of described transformer through the 3rd resistance, its another input is by the 6th grounding through resistance, and by connecing described first operational amplifier, so that send the calling tone of amplifying to receiving element between the output of described first operational amplifier and the 5th resistance between described the 6th resistance.
2. the facsimile receiving circuit of facsimile machine according to claim 1 is characterized in that, described the 5th resistance and the 6th resistance are used for preventing being amplified and the described output signal that transmits turns back to described second operational amplifier by described first operational amplifier.
3. the facsimile receiving circuit of facsimile machine as claimed in claim 1 or 2 is characterized in that the described the 5th and the 6th resistance makes described second operational amplifier by differential amplifier work.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR11476/96 | 1996-04-16 | ||
| KR1019960011476A KR0177100B1 (en) | 1996-04-16 | 1996-04-16 | Receiving circuit for facsimile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1169634A true CN1169634A (en) | 1998-01-07 |
| CN1096786C CN1096786C (en) | 2002-12-18 |
Family
ID=19455842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97110557A Expired - Fee Related CN1096786C (en) | 1996-04-16 | 1997-04-16 | Facsimile receiving circuit |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR0177100B1 (en) |
| CN (1) | CN1096786C (en) |
| GB (1) | GB2312354B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59119968A (en) * | 1982-12-27 | 1984-07-11 | Hitachi Ltd | Facsimile device |
| KR920001184B1 (en) * | 1989-05-31 | 1992-02-06 | 삼성전자 주식회사 | Fax system |
| ES2127211T3 (en) * | 1991-09-04 | 1999-04-16 | Canon Kk | FACSIMIL DEVICE WITH AUTOMATIC TELEPHONE ANSWERING FUNCTION AND COMMUNICATION METHOD IN SUCH DEVICE. |
| US5490210A (en) * | 1993-12-07 | 1996-02-06 | Sasso; Bill J. | Programmable telephone interface device |
| US5479499A (en) * | 1993-12-15 | 1995-12-26 | Murata Manufacturing Co., Ltd. | Sensor circuit for voice/fax switch with cascaded amplifier circuit |
-
1996
- 1996-04-16 KR KR1019960011476A patent/KR0177100B1/en not_active IP Right Cessation
-
1997
- 1997-04-16 GB GB9707710A patent/GB2312354B/en not_active Expired - Fee Related
- 1997-04-16 CN CN97110557A patent/CN1096786C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| KR970072927A (en) | 1997-11-07 |
| GB2312354A (en) | 1997-10-22 |
| CN1096786C (en) | 2002-12-18 |
| GB9707710D0 (en) | 1997-06-04 |
| KR0177100B1 (en) | 1999-05-01 |
| GB2312354B (en) | 1998-06-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20021218 |