CN2466854Y - Multifunctional video telephone - Google Patents

Abstract

The utility model relates to a multifunctional video telephone, which comprises a telephone circuit, a video telephone main circuit, a keyboard part, and a camera head, wherein, the telephone circuit comprises a telephone speech sound circuit, and a signal switching circuit, a transformer audio frequency coupling circuit, and a telephone analog picking circuit, which are separately connected with the telephone speech sound circuit; the video telephone main circuit comprises a central control circuit, an audio frequency processing circuit connected with the central control circuit, a modem, a video processing circuit, a clock circuit, and a line switching circuit connected with the modem; the keyboard part comprises a single-chip computer control circuit, and an incoming number display circuit, a signal sound detection circuit, and a double-audio detection circuit which are connected with the single-chip computer control circuit. The video telephone has multiple functions.

Description

The multifunctional videophone machine

The utility model relates to a kind of communication terminal device, particularly a kind of multifunctional videophone machine; Its image, sound and data are transmission medium with existing ordinary telephone line, and it has multiple function.

At present, along with popularizing of phone, video telephone is also accepted by people gradually; Existing video telephone mainly comprises video call circuit part, plain old telephone circuit part, camera CCD, LCDs and casing etc., only can provide the basic function of video telephone set, and cost is higher.

The purpose of this utility model is to provide a kind of multifunctional videophone machine, on the basis of existing video telephone set, increase caller identification, clock, calendar, week demonstration, alarm clock, phone directory, telephone message, calling record and strange land and monitor multiple functions such as message, to improve the ratio of performance to price of video telephone set, so that the user uses.

For achieving the above object, the utility model is taked following technical measures:

Multifunctional videophone machine of the present utility model comprises: telephone circuit, video telephone main circuit, keyboard portion, camera, LCDs, earpiece/speaker/pick-up;

Telephone circuit comprises the call voice circuit and connected signal switching circuit, transformer audio frequency coupling circuit and phone are simulated circuit for answering respectively;

The video telephone main circuit comprises central control circuit and the audio frequency processing circuit, modulator-demodulator, video processing circuits, clock circuit and the memory that are connected with central control circuit, also comprises the circuit commutation circuit that is connected with modulator-demodulator.

Wherein, described keyboard portion comprises: single chip machine controlling circuit and the connected caller ID display circuit of difference, signal tone testing circuit and double-tone be testing circuit frequently; Also comprise numeric keypad that is connected with telephone circuit and the function keyboard that is connected with central control circuit;

Caller ID display circuit and double-tone testing circuit frequently connect telephone wire respectively; Double-tone testing circuit frequently also connects the signal tone testing circuit; Central processing unit in single chip machine controlling circuit and the video telephone main circuit carries out exchanges data with serial communication mode by the programmable logic array in the central control circuit.

Wherein, described caller ID display circuit comprises ring detecting circuit, optically coupled isolation circuit 314 and decoding circuit;

Optically coupled isolation circuit is a sample circuit, is made of every triode and resistance light; The input of ring detecting circuit connects telephone wire, and its output connects optically coupled isolation circuit and decoding circuit respectively; Decoding circuit connects single chip machine controlling circuit.

Wherein, described audio frequency coupling circuit mainly is made of photoelectrical coupler, audio frequency transformer, switching tube;

The control end of photoelectrical coupler connects described central control circuit through resistance, and two outputs of photoelectrical coupler connect the elementary of described audio frequency transformer and connect the base stage of switching tube through a resistance through an electric capacity respectively; Another input of audio frequency transformer connects the collector electrode of switching tube, and it is secondary to be 3 core taps, connects the input/output terminal of described audio frequency processing circuit respectively; An output of photoelectrical coupler also connects described call voice circuit.

Wherein, described phone simulation circuit for answering comprises two photoelectrical couplers and a switching tube;

The control end of two photoelectrical couplers is connected to described central control circuit through resistance respectively, and its output is connected to the base stage and the described call voice circuit of switching tube respectively by resistance; The collector electrode of switching tube is connected to described signal switching circuit.

Wherein, described clock circuit comprises a clock chip, between 1,2 pin of clock chip and connect crystal oscillator; Power supply together is connected to the 8th pin of clock circuit respectively through two diodes; The pin of clock chip and pin connect the central control circuit of described video telephone main circuit respectively.

Reach embodiment in conjunction with the accompanying drawings, architectural feature of the present utility model be described in detail as follows:

Description of drawings:

Fig. 1: the circuit block diagram of the utility model multifunctional videophone machine embodiment;

Fig. 2: the circuit block diagram of input and keyboard among the utility model embodiment;

Fig. 3 A: the circuit diagram of caller ID testing circuit among the utility model embodiment;

Fig. 3 B: the circuit diagram of clock circuit among the utility model embodiment;

Fig. 4 A: the circuit diagram of the utility model embodiment sound intermediate frequency coupling circuit;

Fig. 4 B: the circuit diagram of the utility model simulation circuit for answering.

As shown in Figure 1, embodiment of the present utility model mainly comprises: plain old telephone circuit 1, video telephone circuit 2, keyboard portion 3, camera 4, LCDs 5, earpiece/speaker/pick-up 6 and casing etc.Foregoing circuit partly is integrally and is assembled in the casing.LCDs 8, camera 7 are positioned at the top of casing, in the mode that roller bearing rotates, are convenient to absorb operator's image and are convenient to the image that the user watches the other side.

As prior art, plain old telephone circuit 1 mainly comprises call voice circuit 11, phone simulation circuit for answering 12 and the signal switching circuit 13 that is arranged on the phone plate; Video call circuit 2 comprises: central control circuit 24 and the audio frequency processing circuit 21, modulator-demodulator 22, video processing circuits 27, clock circuit 28 and the memory 26 that are connected with central control circuit 24.

Principal character of the present utility model is, sets up transformer audio frequency coupling circuit 14 in telephone circuit 1; Set up clock circuit 28 and flash memory 25 at video telephone main circuit 2; Set up calling number identification circuit 31 and signal tone testing circuit 32 in keyboard portion 3.

As shown in Figure 2, it is the circuit block diagram of the keyboard circuit in the utility model; Keyboard portion 3 comprises: single chip machine controlling circuit 30, calling number identification circuit 31, signal tone testing circuit 32 and double-tone be testing circuit 33 frequently; Also comprise numeric keypad 34 and function keyboard 35.Single chip machine controlling circuit 30 connects calling number identification circuit 31, signal tone testing circuit 32 and double-tone testing circuit 33 frequently respectively; Calling number identification circuit 31 and double-tone testing circuit 33 frequently connect telephone wire respectively; Double-tone testing circuit 33 frequently also connects signal tone testing circuit 32; Central processing unit 24 in single chip machine controlling circuit 30 and the video telephone main circuit 2 carries out exchanges data with serial communication mode by the programmable logic array in the central control circuit 24.

Caller ID identification circuit 31 begins to receive the calling party phone number information that is transmitted by telephone wire, and sends the other side's telephone number data to single chip machine controlling circuit 30 when first ring of video telephone.The touch-tone signal that double-tone frequency testing circuit 33 detects from telephone wire passes to single chip machine controlling circuit 30, and signal tone testing circuit 32 mainly obtains the line state information from telephone wire, as: ring-back tone, blind sound, dialing tone.These state informations are transferred to central processing unit 24 in the main circuit through control circuit 30, realize automatic-answering back device.

As shown in Figure 3A, it is the circuit diagram of caller ID display circuit among the utility model embodiment; Caller ID display circuit 31 comprises ring detecting circuit 313, optically coupled isolation circuit 314 and decoding circuit 315; Wherein, optically coupled isolation circuit 314 is a sample circuit, is made of every triode and resistance 316,317 light; The input of ring detecting circuit 313 connects telephone wire, and its output connects optically coupled isolation circuit 314 and decoding circuit 315 respectively; Decoding circuit 315 connects single chip machine controlling circuit 30.

In the caller ID display circuit 31, after 313 pairs of ring alternations of ring detecting circuit bell is compressed into capable step-down current limliting, drive optically coupled isolation circuit 314, detect the ringing-current that is pulse state by its inner light every triode and resistance 316 and 317, be transformed into the signal and the voltage division signal of DC level, be transferred to decoding circuit 315 and handle, detect and produce ring direct current signal level, send to single chip machine controlling circuit 30.In addition, finish that through caller ID testing circuit 31 the caller ID information on the telephone wire is detected 0/1 level, also pass to single chip machine controlling circuit 30.

Decoding circuit 315 is to finish decoding under the control of control circuit 30, RDO end by decoding circuit 315 detects ringing number, by the CDO end synchronous pilot signal detection of the ring of 1200BPS (baud rate) and incoming information data are detected, carry out reading of telephone incoming call information and differentiate, realize detecting and storing of caller ID with calling number identification (CID) software.The demonstration of incoming information, the serial communication mode spi bus passage of data being made of through 3 holding wires of decoding circuit 315 single chip machine controlling circuit 30 is to mainboard communication.Whole system is finished control and management and orthofunction by single chip machine controlling circuit 30, and wherein, control circuit 30 has request signal line (CS), and single-chip microcomputer is operated in the passive request mode that searches at ordinary times; It is exactly to realize by this holding wire that video telephone main circuit 2 enters communication to single-chip microcomputer 30 requests; Single chip machine controlling circuit 30 has the interrupt signal line, behind the detected incoming information of single-chip microcomputer, realize signal interruption by this interrupt signal line, send data by the SPI universal serial bus to mainboard then, and finish caller identification by the video telephone main circuit 2 on the mainboard.

Comparatively crucially in the caller ID testing circuit 31 be, owing to adopt optically coupled isolation circuit 314, realize the effectively isolation of ground end 318 realizations of the ground end 319 (MGND) and the ringing supply of Switching Power Supply, overcome the employing custom circuit, only isolate, when ring, by the interfering noise of the related phone performance that produces altogether with electric capacity 310,312, and unfavorable to synchronization signal detection, easily cause caller ID to detect the failure phenomenon.

Shown in Fig. 3 B, it is the circuit diagram of clock circuit among the utility model embodiment; The clock circuit of present embodiment mainly comprises a clock chip 281, between 1,2 pin of clock chip 281 and connect crystal oscillator 282; Power supply 5V and 3V lithium push button button battery 283 together are connected to the 8th pin of clock circuit respectively through diode 284,285; The pin 3 of clock chip 281 and pin 6 connect the central control circuit 24 of video telephone main circuit 2 respectively.Its operation principle is: clock chip 281 is serial i ²C communication clock chip, device is little, order wire is few, and has the warning interrupt function, and its pin 6 (SDA) is a bidirectional data line, and pin 5 (SCL) is the data clock line, and pin 3 (INT) is the warning interrupt line.Central control circuit 24 constitutes I by the FPGA (Field Programmable Gate Array) control circuit ²The C communication interface, direct and clock circuit 28 communicates, and reads clock data, and clock circuit 28 adopts the external battery stand-by power supplies, and when guaranteeing 2 outages of video telephone main circuit, clock chip 281 can work on, because central control circuit 24 does not have I ²C interface, and the programmability of utilization FPGA (Field Programmable Gate Array) control circuit wherein can very successfully communicate clock circuit 28 and central control circuit 24.Acting as of clock circuit 28: can on liquid crystal display screen, show current date, time, alarm clock in real time, then also have liquid crystal display screen and prompting frame occurs to also have the ring tone of buzzer simultaneously, and can write down the time of recording, message, incoming call.

Shown in Fig. 4 A, it is the circuit diagram of the audio frequency coupling circuit among the new embodiment of this practicality, and audio frequency coupling circuit 14 mainly is made of photoelectrical coupler 141, audio frequency transformer 142, switching tube 143; Audio frequency coupling circuit 14 mainly is the audio process circuit 21 that the telephone audio signal is coupled to video telephone main circuit 2.Wherein, the control end of photoelectrical coupler 141 connects central control circuits 24 through a resistance 145, and two outputs of photoelectrical coupler 141 connect the primary input terminal of audio frequency transformers 142 and connect the base stage of switching tube 143 through a resistance through an electric capacity 144 respectively; Another input of audio frequency transformer 142 connects the collector electrode of switching tube 143, and it is secondary to be 3 core taps, connects the input/output terminal of the audio frequency processing circuit 21 of video telephone main circuit 2 respectively; An output of photoelectrical coupler 141 also connects the call voice circuit 11 in the telephone circuit 1.

Under normal conditions, when photoelectrical coupler 141 not from the control level of central control circuit 24, be in off-state, switching tube 143 is in off-state equally, and audio frequency transformer 142 is in off-state, and call voice circuit 11 separates with audio frequency processing circuit 21, there is not the coupling between signal, but when video telephone will carry out both sides' calling record and message, central control circuit 24 was connected photoelectrical coupler 141, and switching tube 143 also enters on-state.At this moment, call voice circuit 11 and audio frequency processing circuit 21, constitute the audible communication path with audio frequency transformer 142, the voice of both call sides and the message signal under the message state enter audio frequency transformer 142 through electric capacity 144, be coupled to audio frequency processing circuit 21, become digital audio and video signals through audio frequency processing circuit 21 analog-to-digital conversion (A/D), encoded again, compression is left in the flash memory 25, when wanting playback in the mode of file, after recording file takes out from flash memory 25, decompress through audio frequency processing circuit 21, decode digital audio and video signals, be coupled to call voice circuit 11 by audio frequency transformer 142 again through the D/A conversion.The broadcast of recording playback and the prompt tone process that comes to this, the turn ratio of audio frequency transformer 142 is 1: 2, it can reach following effect:

1, all audio signals of the sound circuit on the phone plate 11 (comprising the dual-tone multifrequency push button signalling) all can reach mainboard audio frequency processing circuit 21 by audio frequency coupling transformer 142, have solved both sides' calling record and message problem like this.

2, during playback, audio frequency transformer 142 is coupled to phone plate sound circuit 11 with the audio signal of being recorded from audio frequency processing circuit 21, realizes local recording playback, and the prompt tone of far-end is play.

3, phone plate sound circuit 11 is audio frequency bidirectional two-wire system (full duplex), and mainboard audio frequency processing circuit 21 is audio frequency four lines unidirectional (half-duplex) transmission.Utilize audio frequency coupling transformer 142 both to play the conversion of two to four lines, simultaneously main telephone plate audio frequency and mainboard audio signal have been played good buffer action, and utilize traditional double amplifier echo canceling circuit can only accomplish the conversion of two to four lines, can not accomplish the isolation of signal.Because the ground of telephone wire is different with motherboard circuit ground, caused power supply ground interference strong on the sound channel, it is also extremely undesirable both to have enabled recording, message, playback, acoustical quality.

Shown in Fig. 4 B, it is the circuit diagram of the utility model simulation circuit for answering; Phone simulation circuit for answering 12 in the telephone circuit 1 mainly comprises 121,122 and switching tubes 123 of two photoelectrical couplers; The control end of photoelectrical coupler 121,122 is connected to central control circuit 24 through resistance respectively, and the output of photoelectrical coupler 121,122 is connected to the base stage and the call voice circuit 11 of switching tube 123 respectively by resistance; Off hook signal is also linked the base stage of switching tube 123 through a resistance.The collector electrode of switching tube 123 connects signal switching circuit 13.

When generally phone uses, off-hook or to press Hands-free key be that control switch pipe 123 makes it conducting, phone promptly enters online voice status, utilizes this principle, selects photoelectrical coupler 121,122 for use.The conducting of central control circuit 24 control photoelectrical couplers 121,122 enters the hands-free state of corresponding simulation off-hook formula, and its effect is: when having realized in the family nobody, can simulate off-hook automatically and reply message, also can carry out menu operation simulation off-hook and dial automatically.

In the present embodiment, it is to adopt the MC144547 chip that caller ID detects 31,8-bit microcontroller 30 is selected the PIC16C57 chip for use, clock circuit 28 adopts the FPC8563T chip, the photoelectrical coupler that is adopted is all selected the TLP521-1 model for use, and audio frequency coupling transformer 142 employing turn ratios are 1: 2 audio frequency transformer.

Compare with prior art, the utlity model has following beneficial effect:

1, video telephone set of the present utility model utilizes the special audio coupling transformer to phone plate With the audio signal coupling of mainboard, play the conversion of two to four lines, effectively carry out signal simultaneously Isolation reaches the high-quality digital recording, message-leaving function. Adopt the control of light lotus root isolation imitate pick machine, Rise get home in unmanned automatic-answering back device.

2, video telephone set of the present utility model is few with clock master chip pin, the simple (I of communication²C Communication), the power supply of battery secondary, power failure data is not lost the formation clock circuit, realizes in real time day Phase, time showing, timer clock. Adopting the photoelectric coupling circuit isolation to gather caller ID detects Synchronizing signal replaces traditional two Capacitance Coupled, degree of accuracy height, and circuit is done around little.

3, video telephone set of the present utility model utilizes the dual-tone multifrequency inspection with Chinese actions menu Slowdown monitoring circuit is realized telephone number and name input in the phonebook function, editor, cryptographic check Deng. Can utilize imitate pick machine to realize that easy phone speed is dialled under the menu.

Claims (6)

1, a kind of multifunctional videophone machine comprises: telephone circuit (1), video telephone main circuit (2), keyboard portion (3), camera (4), LCDs (5), earpiece/speaker/pick-up (6); It is characterized in that:

Telephone circuit (1) comprises call voice circuit (11) and connected signal switching circuit (13), transformer audio frequency coupling circuit (14) and phone are simulated circuit for answering (12) respectively;

Video telephone main circuit (2) comprises central control circuit (24) and the audio frequency processing circuit (21), modulator-demodulator (22), video processing circuits (27), clock circuit (28) and the memory that are connected with central control circuit (24), also comprises the circuit commutation circuit (23) that is connected with modulator-demodulator (22).

2, multifunctional videophone machine according to claim 1, it is characterized in that described keyboard portion (3) comprising: single chip machine controlling circuit (30) and difference connected caller ID display circuit (31), signal tone testing circuit (32) and double-tone be testing circuit (33) frequently; Also comprise numeric keypad (34) that is connected with telephone circuit (1) and the function keyboard (35) that is connected with central control circuit (24);

Caller ID display circuit (31) and double-tone testing circuit (33) frequently connect telephone wire respectively; Double-tone testing circuit (33) frequently also connects signal tone testing circuit (32); Central processing unit (24) in single chip machine controlling circuit (30) and the video telephone main circuit (2) carries out exchanges data with serial communication mode by the programmable logic array in the central control circuit (24).

3, multifunctional videophone machine according to claim 2 is characterized in that, described caller ID display circuit (31) comprises ring detecting circuit (313), optically coupled isolation circuit (314) and decoding circuit (315);

Optically coupled isolation circuit (314) is a sample circuit, is made of every triode and resistance (316,317) light; The input of ring detecting circuit (313) connects telephone wire (33), and its output connects optically coupled isolation circuit (314) and decoding circuit (315) respectively; Decoding circuit (315) connects single chip machine controlling circuit (30).

According to claim 1 or 2 or 3 described multifunctional videophone machines, it is characterized in that 4, described audio frequency coupling circuit (14) mainly is made of photoelectrical coupler (141), audio frequency transformer (142), switching tube (143);

The control end of photoelectrical coupler (141) connects described central control circuit (24) through resistance, and two outputs of photoelectrical coupler (141) are respectively through an electric capacity 144) connect the elementary of described audio frequency transformer (142) and connect the base stage of switching tube (143) through a resistance; Another input of audio frequency transformer (142) connects the collector electrode of switching tube (143), and it is secondary to be 3 core taps, connects the input/output terminal of described audio frequency processing circuit (21) respectively; An output of photoelectrical coupler (141) also connects described call voice circuit (11).

According to claim 1 or 2 or 3 described multifunctional videophone machines, it is characterized in that 5, described phone simulation circuit for answering (12) comprises two photoelectrical couplers (121,122) and a switching tube (123);

The control end of photoelectrical coupler (121,122) is connected to described central control circuit (24) through resistance respectively, and its output is connected to the base stage and the described call voice circuit (11) of switching tube (123) respectively by resistance; The collector electrode of switching tube (123) is connected to described signal switching circuit (13).

6, according to claim 1 or 2 or 3 described multifunctional videophone machines, it is characterized in that described clock circuit comprises a clock chip (281), between 1,2 pin of clock chip and connect crystal oscillator (282); Power supply together is connected to the 8th pin of clock circuit respectively through diode (284,285); The pin 3 of clock chip (281) and pin 6 connect the central control circuit (24) of described video telephone main circuit (2) respectively.

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