CN2442468Y - Global digital mobile speech end - Google Patents

Abstract

The utility model relates to a global digital mobile speech terminal, which comprises a microprocessor, a GSM module, an audio transmission / reception processing module, an audio switching network, a telephone interface circuit, and an ordinary telephone set. The GSM module, the audio transmission / reception processing module, and the telephone interface circuit are respectively connected with the audio switching network, and the microprocessor; the audio switching network is connected with the microprocessor; the telephone interface circuit is connected with the ordinary telephone set. With using the technique of antipole direct current ringing by the utility model, the utility model can share the existing microprocessor which is arranged in a GSM terminal unit, and the GSM module; with using the control of a monolithic computer microprocessor, the utility model can realize the switching process of dialing, ringing, and voice channel; with completing simultaneously vehicle navigation and personal navigation, the utility model can realize the talking function of answering and calling for the ordinary telephone set, and because of regarding an MPU as a control centre, the utility model lowers the work intensity of development.

Description

Digital mobile voice terminal, the whole world

The invention belongs to communication field, relate in particular to global digital mobile voice terminal.

Appearance along with GSM vehicle mobile terminals (for example onboard navigation system), GSM hand-held mobile terminal GSM mobile terminations such as (for example individual Position Fixing Navigation Systems) utilizes GSM to transmit various data messages and has opened up a new technical field.When being in remote districts, telephone does not cover as yet, but global digital mobile communication network covers, require GSM mobile termination when finishing automobile navigation, personal navigation, realize the call function of answering and dialing of plain old telephone, existing GSM mobile termination is not broken away from the limitation of the exclusive telephone that is connected with GSM mobile termination all the time for satisfying this requirement when exploitation, have following problem:

1, development technique complexity: adopt the singlechip technology exploitation, technical sophistication degree height, and need the communications protocol of definition voluntarily and GSM mobile termination.

2, cost is higher: exclusive telephone also needs embedded micro-processor, correspondent peripheral circuit, relevant voicefrequency circuit and shell.

3, off-gauge interface: adopt self-defining communication interface and voice-grade channel.

4, communication effect is undesirable: because the electrical standard of self-defined voice communication, and parallel with DC power supply cable, serial communication cable, interference signal is arranged.

5, occupying system resources: microprocessor is communicated by letter with exclusive telephone by serial ports with time repeating query inquiry mode, takies system time and serial port resource.

The purpose of this utility model is exactly in order to address the above problem, and global digital mobile voice terminal is provided.

Digital mobile voice terminal, the whole world, it is characterized in that: form by microprocessor (MPU), gsm module, audio frequency transmitting-receiving processing module (MT8888), audio exchange network (4066 analog switch), telephone interface circuit (MY88622C) and ordinary telephone set, gsm module, audio frequency transmitting-receiving processing module, telephone interface circuit join with audio exchange network, microprocessor respectively, audio exchange network and microprocessor join, and telephone interface circuit and ordinary telephone set join.

Microprocessor MPU, it is the control centre of global digital mobile voice terminal, can detect identification off hook state signal, the audio signal of audio frequency transmitting-receiving processing module transmitting-receiving outside telephone stations dialing, by the audio exchange network telephone interface circuit and gsm module are connected then, up to using the ordinary telephone set end of conversation.The utility model utilizes the technology of antipole DC signalling, the interface of whole world digital mobile terminal and outside ordinary telephone set adopts the MY88622C standard chips, microprocessor, the gsm module of shared existing 6SM terminal unit inside, utilize the switching of singlechip microprocessor chamber system realization dialing, ring and speech channel, finish the call function of external ordinary telephone set.The utility model is realized the call function of answering and dialing of plain old telephone when finishing automobile navigation, personal navigation, and realizes functions such as warning, Query Information by pressing bond energy.Because adopting MPU is control centre, has reduced development effort intensity; Adopt ordinary telephone set and standard interface, communication effect is good; Respond clearly in the mode of interrupting simultaneously and ask, saved system time and serial port resource.

Fig. 1 is the utility model voice terminal module frame chart.

Fig. 2 is the utility model voice terminal electrical schematic.

Fig. 3 is the schematic diagram of existing telephone power ringing.

Fig. 4 is the ring schematic diagram of the telephone set in the utility model.

Describe in detail below in conjunction with drawings and Examples.

As shown in Figure 1, digital mobile voice terminal, the whole world, it is characterized in that: form by microprocessor (MPU), gsm module, audio frequency transmitting-receiving processing module (MT8888), audio exchange network (4066 analog switch), telephone interface circuit (MY88622C) and ordinary telephone set, gsm module, audio frequency transmitting-receiving processing module, telephone interface circuit join with audio exchange network, microprocessor respectively, audio exchange network and microprocessor join, and telephone interface circuit and ordinary telephone set join.

As shown in Figure 2, the work of global digital mobile voice terminal is control centre with the microprocessor MPU.Telephone interface circuit mainly is made up of MY88622C chip, triode, relay, the TIP of MY88622C chip and RING pin A, the party B-subscriber's line by relay and the ordinary telephone set formation loop that joins, MPU joins by the SHK1 pin of 74LS573 and MY88622C, MPU joins by the base stage of 74LS574, resistance and triode, and the collector electrode and the relay of triode join.MPU is by the high-low level of the SHK1 pin of identification MY88622C, realize that by the VX of audio exchange network control MY88622C and VR pin the conversion of voice-grade channel between telephone interface circuit and gsm module, telephone interface circuit and audio frequency transmitting-receiving processing module (MT8888), ring control circuit then utilize relay to control the ring of the positive-negative polarity realization ordinary telephone set of the TIP of MY88622C and RING pin.

When external call is squeezed into, gsm module is by serial ports output signal notice microprocessor MPU, microprocessor is replied, control audio transmitting-receiving processing module (MT8888) is given the gsm module signal tone from voice-grade channel by the audio exchange network then, expression has outside line to insert, microprocessor produces periodic anti-polar signal and makes phone ringing by the periodically adhesive of 74LS574 control relay in outside line; If external call off-hook, then on the SHK1 pin of telephone interface circuit (MY88622G), export high level, microprocessor recognizes high level at the 74LS573 input port, the control switching network is connected the voice-grade channel of gsm module and telephone interface circuit (MY88622C), begin conversation, till side's on-hook.

When outwards calling, phone off-hook at first, on the SHK1 pin of telephone interface circuit (MY88622G), export high level, microprocessor recognizes high level at the 74LS573 input port, the control audio switching network is connected the voice-grade channel of audio frequency transmitting-receiving processing module (MT8888) and telephone interface circuit (MY88622C), the double-tone that phone is transferred to number frequently has audio frequency transmitting-receiving processing module (MT8888) to be converted to digital signal to be read by the microprocessor step-by-step, if surpassing 5 seconds does not dial, be considered as FD finished dialing, microprocessor is exported dialing signal to gsm module from serial ports, control switching network simultaneously and connect the voice-grade channel of gsm module and telephone interface circuit (MY88622C), wait for conversation, till side's on-hook.

In the utility model, also need solve the technical problem of phone ring.As shown in Figure 3, ordinary telephone set is to utilize the interchange ringing-current of 75V ± 15V to realize ring, and GSM mobile termination provides direct voltage, is difficult to convert to so high interchange ringing-current, promptly allows to realize, also needs very high cost.Through research to the plain old telephone circuit, though find ringing-current for exchanging, through the rectification of its internal circuit, the still direct current that last ring is required.Through change as shown in the figure to ringing circuit, replace the rectification circuit of the electric capacity crosstalk resistance of plain old telephone with diode, by GSM mobile voice terminal provide ± (at non-ringing condition, A to the voltage of B is-24V for the direct voltage of 24V; At ringing condition, A to the voltage of B be+24V), can realize the ring of phone in the utility model.

Claims (3)

1, global digital mobile voice terminal, it is characterized in that: form by microprocessor, gsm module, audio frequency transmitting-receiving processing module, audio exchange network, telephone interface circuit and ordinary telephone set, gsm module, audio frequency transmitting-receiving processing module, telephone interface circuit join with audio exchange network, microprocessor respectively, audio exchange network and microprocessor join, and telephone interface circuit and ordinary telephone set join.

2, global digital mobile as claimed in claim 1 voice terminal, it is characterized in that: telephone interface circuit mainly is made up of MY88622G chip, triode, relay, the TIP of MY88622G chip and RING pin A, the party B-subscriber's line by relay and the ordinary telephone set formation loop that joins, MPU joins by the SHK1 pin of 74LS573 and MY88622C, MPU joins by the base stage of 74LS574, resistance and triode, and the collector electrode and the relay of triode join.

3, global digital mobile as claimed in claim 1 voice terminal is characterized in that: in ordinary telephone set, party A-subscriber's line is joined by diode rectification and ringing circuit.

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