CN1085709A - The transmission method of voice signal and computer data and system - Google Patents

Abstract

A kind of method and system that transmits the information of form of sound and data mode, wherein information is produced by a transmitting apparatus, use for one or more receiving equipments, feature is to utilize existing stereo equipment propagation and stored sound and these two kinds of information of computer data, one of them passage is used to transmit voice signal, another passage is used to transmit data, by synchronizing signal synchronous transmission and demonstration voice signal and relevant vision data signal.

Description

The transmission method of voice signal and computer data and system

The present invention relates to the transmission method and the system thereof of voice signal and computer data, more particularly, relate to the method and system that voice signal and computer data signal synchronously is transferred to one or more receiving equipments by a transmitting apparatus.

Teaching, newspaper and broadcasting are the different industries of society, but with regard to the angle of message transmission, their something in common is: information is produced by an information source, supply with information receiver's use that number is not limit, information wherein has the auditory information of form of sound and the visual information of text screen form.Particularly at teaching field, TV aided education of propagating by information and computer-assisted instruction have become two kinds of main means in the present electronic teaching.

Teaching process needs V. A. (as literal and picture) and sound teaching material.Adopt the TV aided education of TV tech to connect these two kinds of teaching materials well, make observer (student) that sensation on the spot in person not only be arranged, and, utilize television set, video tape recorder aspect study, to create geographical space and temporal great convenience for the student because educational programme is to propagate in the mode of television broadcasting.Particularly because TV aided education means have sound and the major advantage of open and cheap (propagation) media of giving lessons is arranged, thereby it has become one of main means in the electronic teaching.But, TV aided education means can not be test the student in time, particularly can not test at each student's concrete condition, thereby the result that passes a test in time and neatly changes teaching process (teaching process), at most also can only be by the student by control to player " stop, fall, still frame ", oneself controls study schedule, and therefore this teaching means lacks changeability and flexibility, is the learning system of a passive type.

By comparison, computer-assisted instruction (Computer assisted learning) CAL and (Computer based training) CBT, then remedied this deficiency, except under the help of computer, can provide outside the V. A. to the student, its most outstanding advantage is: computer can be test the student in time by the form of " human-computer dialogue ",, realize executing number by next step teaching process of computer layout automatically according to the result of test because of the people.So we can say computer-assisted instruction is a kind of active teaching means, be a kind of teaching means more rising than TV aided education.Certainly, computer aided instruction system also should further provide the sound teaching material to the student, resembles (propagation) media of giving lessons cheap and open the television broadcasting but also need one.

On the acoustic problem in solving computer-assisted instruction, the new computer aided instruction system of computer and videodisc, computer and compact disc (CD) be combined into had appearred in recent years.It can provide high-quality V. A. and sound teaching material to the student by videodisc or compact disc, has the advantage of computer auxiliaring teaching means simultaneously again, teaching process flexibility and changeability, energy differential treatment in education.But in this teaching means, teaching propagation medium problem is not resolved, and program making (comprise laser is looked, the making of disc record) technical difficulty height, apparatus expensive.For propagation (giving lessons) the media problem that solves computer-assisted instruction, people also attempted the network technology that uses a computer in recent years, as, local data's net and public data network and telephone network.The comprehensive use of these networks might make the classroom of computer-assisted instruction expand any one corner to, can extend the place that obtains but student terminal must be located at the network equipment (as cable).And with this data network transmission voice signal, the data volume of the voice signal after mould/number (A/D) conversion is very big, makes it to be difficult to carry out application.The another kind of new sound (phone, broadcasting), literal, image of transmitting simultaneously (is to be used for still frame at present, also might develop into from now on and comprise TV programme) and the comprehensive common network of computer data, for example, German ISDN net at present under preparation will enter the practical stage in the near future.Though can solve the acoustic problem in the computer-assisted instruction and the media problem of giving lessons simultaneously with such network, but this communication media can not show a candle to the radio broadcasting net popularize like that, open, and its technical difficulty and expense are difficult to receive at least in the near future concerning the student.

On the other hand, with regard to regard to the newspaper, broadcasting and the TV that write down and propagate the main means of social public information at present, the information that they write down and propagate, as news, bulletin, economic information, commercial advertisement and weather, transport information or the like, also have sound and/or written two kinds of forms.Along with increasing severely with day and computer application universal day by day of social public information amount, the recipient of information (reader and audience) not only wishes the propagation velocity of raising information, (it is too slow that the information propagation velocity of newspaper has obviously been disliked), but also wish and can retrieve and process these public informations by means of computer.

The purpose of this invention is to provide a kind of cheapness method and system of synchronous transmission voice signal and computer data effectively, on the basis of present computer-assisted instruction, solve sound teaching material and open these two problems of media of giving lessons simultaneously.

The present invention also aims to utilize computer that the social public information that newspaper, broadcasting and TV write down and propagate is retrieved and processed, so that these information can be for repeatedly using.

The feature of the method according to this invention and system is to be borrowed in stereophony broadcasting and stereophonic recording technology and equipment now ripe and that popularize, the voice and data in transmission and the storage computation machine aided education.In teacher's terminal, V. A. is processed to the data (being the teaching material data) of computer earlier, then by the acoustic-electric requirement of existing stereophonic broadcasting and recording and/or reproducing apparatus, these transformation of data are become the signal of telecommunication (being data-signal) of audio form, by stereo equipment a passage---data channel is transmitted and is stored; The sound teaching material uses another passage---the sound channel of stereo equipment then with the acoustic-electric form (being voice signal) of the analog quantity that do not add modulation.These two kinds of signals can be recorded in the common audio tape, by the transmission of stereophonic broadcasting net, supply with the student terminal use that number is not limit.At student terminal, data-signal is reduced into computer data earlier, is processed into V. A. (as text screen) by computer again, presents to the student; Voice signal is then given the student by loudspeaker plays.And V. A. and sound teaching material are organically connected with synchronizing signal.The advantage of the teaching means that this is new is that the media that employed technology maturation, equipment are popularized, transmitted and stores is inexpensive and open; It has kept the original advantage of computer auxiliaring teaching means, that is: calculate function and in time the student is test, and according to test result, corresponding teaching process of automatic editing carries out the differential treatment in education.A teaching means so obviously is better than other teaching means.

According to a further aspect in the invention, in view of " stereo " in the news broadcast do not have great practical significance, therefore, the present invention is in station broadcast news, sound only uses a passage, and another passage is used for propagation data, promptly carries the computer data of social public information.These data can be and direct relevant literal and the picture of news (sound), also can be other social public informations.After an information (or a piece of news) is gathered by the radio station, just it is edited and processed into computer data by specific (database) data format, just can directly pass to huge numbers of families together from the radio station with sound immediately.These data can be input in information receiver (audience and reader's) the computer, by computer these social public informations are retrieved, and more required information are presented on the phosphor screen, perhaps are printed on the paper.The material that is used to store these information is audio tape or computer disk, can repeatedly use.The outstanding advantage of like this " broadcast type newspaper " is that it also transmits without the post office promptly without typographical printing, issues soon, reads conveniently also can save a large amount of paper.

Feature of the present invention is to utilize existing stereo equipment, propagate and store sound and computer data in teaching or the news, transmit two kinds of information by means of stereo transmission equipment and/or recording equipment, one of them passage is used to transmit voice signal, and another passage is used for Data transmission.

According to system of the present invention, comprise the receiving terminal that a transmission terminal and number are not limit.Sending terminal equipment is made up of a personal computer, sound source (as, microphone), a transmission adapter and a stereo recorder.This transmission adapter comprises a modulation circuit at least, is used to modulate the data of computer output.Can also have an interface circuit that is used for remote control stereo recorder and remote control voice signal in addition in the adapter.The equipment of each receiving terminal is made up of a personal computer, one group of loud speaker (or earphone), a reception adapter and a stereo recorder.This reception adapter comprises a demodulator circuit at least, is used for the required data of demodulation computer.In addition, an interface circuit that is used for remote control stereo recorder and remote control voice signal can also be arranged in the adapter.If propagate with radiobeam, transmitting terminal also needs a stereo broadcast transmitter, and receiving terminal also needs a stereophonic broadcasting to connect the sound machine.The recorder of transmitting terminal and the recorder of receiving terminal can, will send adapter or receive adapter and directly be connected on the transmission medium, at this moment some function of system will reduce, as the hardware error correction of receiving terminal PC.Used in force personal computer and stereo equipment all are the common apparatus on the market.Transmission adapter that the present invention exemplified and reception adapter all can adopt the common electronic component that circulates on the market to realize.Send the physical circuit of the interface of in matching device and the reception matching device recorder being controlled, should decide according to the different model of employed recorder, if recorder has been furnished with the Remote Control Interface of computer, even install in the recorder receiving an adapter packs, such system is just much easy.

The method according to this invention and system, the data of computer at first will be transformed into the desired signal form of audio frequency apparatus (being data-signal), just can send into stereo equipment, after transmission, it is reduced into the data of computer again, just can send into computer and use modulating/demodulating process that Here it is.The mode of modulation can have multiple, the present invention to the major requirement of modulation/demodulation circuit is: data should have the high as far as possible transmission density and the enough low error rate in transmission, (in other words conj.or perhaps, minimum transmission rate and reliability), just can make system have Practical significance.The present invention has exemplified the modulator/demodulator circuit of pulse-amplitude (PAM) and two kinds of modulation systems of pulse-phase place (PPHM).These two kinds of modulator/demodulator all adopt serial i/O interface (V-24/RS-232 interface) to be connected with computer with asynchronous transmission rules (" initial/as to stop " transmission protocol), circuit is simple and reliable, the signal that modulates is applicable to voice-grade channel, and stereo equipment is not had additional requirement.PPHM-modulator wherein carries out phase modulation or frequency modulation to the carrier wave of output, also can carry out additional modulation to its amplitude modulation simultaneously.In order to improve the density of transfer of data and storage, the baud rate of the transfer of data of use approaches the highest frequency of audio frequency apparatus frequency band, and the phase jitter of data-signal that therefore arrives receiving terminal is very big.Demodulator circuit among the present invention can allow that the phase jitter of incoming bit stream is up to ± 30%.The baud rate change-over circuit that receives in the adapter can be by asynchronous transmission rules (" initial/as to stop " transmission protocol), and the data in the processing bit stream drive with the stable clock signal then again, export to computer.Also exemplify the signaling conversion circuit that is used for the remote control recorder among the present invention, and be used for the control circuit that " stereo/monophonic " automaticallyes switch.Hereinafter also will address in detail.

In system of the present invention, data are divided into system data and information data two classes.System data is meant the base program that is used to produce with the machining information data, and it is made up of many basic subprograms, for example: the base program that base program that prepare lesson and saying is used class hour in the teacher PC and the interior student of student PC listen to the teacher and use when learning; The used base program of news that retrieval and processing are received among base program of using when and for example among the PC in broadcasting station news being gathered and edited and broadcasting listener's the PC.Put it briefly, system data is common to different curriculas or different broadcast programs, and it leaves memory (system disk) lining of the computer of transmitting terminal and receiving terminal respectively in, calls in the internal memory service area of computer during use.Information data is that part of data inequality between different curricula or the different broadcast program, and it comprises vision data and synchronizing signal.Vision data is the data of carrying visual information content, for example: demonstration program of the textbook content in the teaching (literal, picture), Education Test Service and simulation teching experiment or the like, or the content of literal, picture and other social public informations of news in the broadcasting.Synchronizing signal connects present (the computer program process) of sound and visual information.

For efficient and the reliability that improves system, the system data of the PC of receiving terminal leaves in the system disk of receiving terminal PC, from the service area of the PC that packs into here.By the information data of having only of media transmission, and information data is the input parameter as these programs.Can reduce the direct influence of error of transmission so effectively to program running among the receiving terminal PC.Each base program in the receiving terminal also should be provided with the manual intervention interface, the program emergency exit during as mistake.

In advance vision data is processed in the visual information collection that will send in the transmission terminal, and leaves in the transmitting terminal PC with the form of file.When transmit information data, the PC of transmitting terminal will be by a predetermined order, these file division are become the suitable data block of size, and generate one group of P-parameter for each data block, the P-parameter has been carried the feature of this data block, as: sequence number, size, check code and failure tolerance and transmission destination or the like.Each data block and its P-parameter are formed a packet, send together.Separate with " isolating symbol " between packet and the packet.

The P-parameter is that receiving terminal PC carries out EDC error detection and correction to each packet, and the foundation that the data block in the bag is added man-hour.For example: can find mistake in the transfer of data with the sequence number in the P-parameter, size and check code; Sequence number is again the foundation of hardware error correction, and failure tolerance then is the foundation of Software correction; According to " the transmission destination " in the P-parameter, the data block in the bag or be reassembled into the file of vision data deposits filebuf in, or is used as the service area that synchronizing signal will be sent into student PC.In addition, the sequence number in the P-parameter also can be used as the foundation of fixing a point in the audio tape.

At receiving terminal, the sound that visual information that shows in the PC and loudspeaker plays are come out should echo mutually, and promptly visual information and auditory information should be synchronous, and this point is extremely important.But the vision data that carries visual information is not of uniform size, the transmission time that it is required, compare with the transmission time of the sound relevant with it, and widely different, for example, the data of the colored high-resolution drawing of a width of cloth need several minutes transmission time.For one group of data can be presented in the correct moment in face of the student, solution of the present invention is: transmit vision data in advance, and be stored in specific filename in the filebuf of receiving terminal PC; And then with synchronizing signal vision data is connected with the sound relevant with it, promptly in the moment relevant, with synchrodata this is organized vision data and from memory, read out with sound.

Synchronizing signal is produced by the PC of transmitting terminal, and it carries code and one group of input parameter of a subprogram.One in the base program of this coded representation receiving terminal PC (in the system disk) by the selected subprogram of transmitting terminal PC; This group input parameter is exactly the input parameter of this subprogram.Suitable (relevant with sound) constantly, the PC of transmitting terminal inserts synchronizing signal in the data flow of data channel, is sent to the PC of receiving terminal.Transmitting terminal PC controls receiving terminal PC by synchronizing signal: call some subprograms, and process a certain group of input parameter.Such as, the code in the synchronizing signal is meant the picture display subroutine, and input parameter is meant the filename that is pre-stored in a certain width of cloth image information in the receiving terminal PC, and so, when receiving this synchronizing signal, receiving terminal PC is presented at this width of cloth picture on the phosphor screen; And for example, this code is meant cursor mover program, and input parameter is the position at cursor place, and so, the cursor on the phosphor screen of receiving terminal PC just is moved to appointed positions and gets on.By this way, the actual transmissions time of visual information is transparent to recipient (student or audience), reads and the processed required time in the memory of just one group of data form computer that people feel.If these data are stored among the RAM, this temporal differences just may be short to and not recognize so.Therefore, being meant synchronously of visual information and sound, relevant voice signal should occur simultaneously in the synchronizing signal in the data channel and the sound channel, and the transmission of the data of visual information then should be fulfiled ahead of schedule.

Mistake in the transfer of data is contingent at any time.Because it is different with other data communication system, transfer of data in the native system is unidirectional, receiving terminal PC is off line (Off-line, promptly directly not linking to each other, be not subjected to its direct control with transmitting terminal PC) mode works, therefore, when receiving terminal PC finds error of transmission, can not be to transmitting terminal PC reporting errors, the data of request repeat mistake.This present invention has been taked following transmission safeguard measure:

-reduce the error rate of transmission: adopt rational modulating/demodulating mode and circuit, the error rate of transmission is reduced to floor level.Modulation/demodulation circuit among the present invention can be reduced to 10 to the error rate effectively ^-6Below.

-error detection: with the check code in the P-parameter, each bit in the check data bag.The generation of check code and method of calibration thereof can be used the effective way in other transfer of data rules, as: the FCS in the HDLC-procedure.In addition, with the sequence number in the P-parameter, the mistake during size also can be found to transmit.

-error correction: the possibility that the sequence number in the P-parameter provides a hardware error correction for receiving terminal PC, when receiving terminal PC found data transmission fault, it made audiotape refund one section by the remote control to recorder, and then the signal on this section tape of resetting.According to the sequence number in the P-parameter, receiving terminal PC just can find needed packet, corrects its mistake.As long as it is destroyed that the signal on the tape does not have, this error correction method is effectively.In addition, the error correcting code that fault-tolerant data are not added also provides the possibility of Software correction for these class data.

-fault-tolerant data: the present invention is divided into fault-tolerant data and not fault-tolerant data two classes to institute's information transmitted data in the system.It is vicious that some information data is actually permission, for example, carries the data of literal or image information.Mistake in these class data does not influence the operation of computer mileage preface, its influence resembles wrongly written character and the hiatus in the article, or a stain on the width of cloth picture, the recipient of information (student or audience) can be with controlling oneself to the sound exported in the loud speaker, to the context of article or to the understanding of picture integral body, oneself corrects mistake wherein.This fault-tolerance data account for the exhausted big part of institute's information transmitted data.In order to save the transmission time, there is no need to the additional error correcting code of fault-tolerant data, because error correcting code need take the transmission time.The fault-tolerance of data is represented: when can't (by the hardware error correction) correcting, this misdata still can be used in the PC of receiving terminal when these class data are wrong; In case of necessity, these class data be need not error detection handle, just can use.The failure tolerance of each data block should be indicated in the P-parameter.

-not fault-tolerant data: another kind of data are the mistakes that never allow wherein to have any one bit, because this wrong program running that can influence PC, such as: the data of synchronizing signal, P-parameter itself and program (as " test " program in the teaching and the demonstration program of simulation teching experimentation etc.).These class data should be handled with automatic error correction coding in advance, and then the packing transmission.Therefore, have one section not fault-tolerant data at least in each packet, that is, P-parameter itself indicates the failure tolerance of data block in this bag again with the P-parameter.

In order to make native system to normal stereophonic program compatibility, the present invention does not require emission, reception, recording and the playback circuit that changes stereo equipment, but in the pairing audio output circuit of data channel, (as, the input of audio frequency output amplifier, or the input of loud speaker), establish " stereo/monophonic " diverter switch.Some particular data when utilizing transfer of data in the data flow, marker character as transfer of data, drive this " stereo/monophonic " diverter switch: when the transmission be data the time, it is transferred to sound channel to the pairing sound out-put circuit of data channel and gets on, make all play sound signal in the passage of left and right sides two-way loud speaker, at this moment output is monophonic; After DTD, this marker character disappears, and stereo/monophonic diverter switch automatically resets, and recovers normal stereophony.

Utilize the present invention, can concentrate the advantage of TV aided education and computer-assisted instruction, adopt the resource and the equipment that are dirt cheap and popularize to realize transmission of Information, record and broadcast; The present invention also can be used for similar news broadcast and entertainment purposes.

Below in conjunction with the accompanying drawings in the description to one embodiment of the present of invention, above purpose of the present invention and other feature and advantage, it is clearer and more definite to become.If teacher's terminal is here made into the broadcast terminal of information, student terminal is made into information receiving terminal, just can become an embodiment who is applied to information broadcast.In the accompanying drawings:

Fig. 1 is the system sketch plan of the present invention when being used for computer-assisted instruction;

Fig. 2 further specifies the block diagram that the present invention shown in Figure 1 is used for computer aided instruction system;

Fig. 3 is the circuit diagram of pulse-amplitude (PAM) modulator;

Fig. 4 has marked the time relationship of signal in the modulator shown in Figure 3;

Fig. 5 is the circuit of pulse-amplitude (PAM) demodulator;

Fig. 6 has marked the time relationship of signal in the demodulator shown in Figure 5;

Fig. 7 is the circuit diagram of pulse-phase place (PPHM) modulator;

Fig. 8 shows the time relationship of signal in the modulator shown in Figure 7,

Fig. 9 is the circuit of pulse-phase place (PPHM) demodulator,

Figure 10 has marked the time relationship of signal in the demodulator shown in Figure 9,

Figure 11 is the circuit diagram of the baud rate transducer of system of the present invention;

Figure 12 is the control signal transducer of system of the present invention and the circuit diagram of voice controller;

Figure 13 represents the relation of signal in the control signal converting circuit shown in Figure 12.

Figure 14 represents the schematic block diagram according to enhancement mode computer mathematics of the present invention system;

Figure 15 illustrates the schematic diagram of a multiplexing one tunnel or two-way audio signal.

Same parts use identical label in above-mentioned figure.

Shown in Figure 1 is a computer aided instruction system.Teacher's terminal wherein mainly is made up of a teacher PC (1), a microphone (2), a transmission adapter (3) and a stereo recorder (4).The data of teacher PC (1) output are modulated into the desired signal form of stereo equipment by sending adapter (3)--after the data-signal, the voice signal of just same microphone (2) output is recorded in respectively in two magnetic tracks on the audio tape of recorder (4) together, then by transmission medium (5) transmission, the student terminal of not limitting for number uses, as student 1,2,3,4 ... n (10,11,12).

Transmission medium (5) can be the stereophonic broadcasting net, can be that the circuit of any paired cable connects, also can be the duplicating and transmit or the combination of above three kinds of forms of carrier (as audiotape) of stereophonic signal.

Each student terminal is made up of a stereo recorder (9), a reception adapter (6), a PC (7) and one group of loud speaker or earphone (8).Student terminal passes through transmission medium (5) or passes through the broadcast of stereo recorder (9) lining tape, obtains data-signal and voice signal.Data-signal is processed into visual information by student PC (7) again by receiving the data that adapter (6) is reduced into computer, presents to the student.Voice signal is played back by loud speaker (8) through receiving adapter (6) control.Receive adapter (6) and also can directly receive upward work of transmission medium (5), as, student terminal (1).

Fig. 2 is further specifying of present embodiment, among the figure memory of computer and program function is separately explained, does not represent the hardware division of labor of computer.

The operation principle of teacher's terminal at first is described.The outer periphery of teacher PC (1) has: display (15), keyboard (16), light pen (17) and figure collector (18).The base program that system data among the teacher PC (1) is meant prepare lesson and uses when giving lessons, the basic tool of teaching in other words conj.or perhaps.The system data of teacher PC leaves in the system disk (19) in the teacher PC, its service area (20) of packing into during use.The teaching material of teacher when preparing lessons as collections such as the analog demenstration program of article, picture, " test " program and education experiment and the teaching material file that processes, leaves the lining, file area (21) in the memory of teacher PC in.In the process of giving lessons, teacher PC (1) becomes the suitable data block of size to these teaching material file division by predetermined order, and is P-parameter of each data block generation.Data block and its P-parameter have been formed packet jointly, send together.The P-parameter has been indicated the feature of this packet: its sequence number, size, check code, fault-tolerance and transmission destination etc.The P-parameter is the foundation of student's personal computer (7) when handling each packet.In the present embodiment, utilize the marker character of " blank character " between the packet (being " the initial symbol " of the connection of asynchronous transmission more than 20) as transfer of data.In the process of giving lessons, teacher PC (1) also produces synchronizing signal, and in time (with voice signal synchronously) synchronizing signal is inserted in the data flow sent, be sent to student PC.Synchronizing signal is being carried the control command of teacher PC to program running among the student PC, calls the subprogram of an appointment in the system data of student PC that is:, is used to process the teaching material file of an appointment, thus the teaching process of control student terminal.Teacher PC (1) can perhaps be connected with transmission adapter (3) by bus interface (PC-Bus) by its serial i/O interface (V-24/RS-232 interface), and input/output port (22) is used to manage this interface.

Send adapter and comprise data modulator (23), signal converter (25) and voice controller (24).The data of teacher PC (1) output are modulated by the data modulator (23) that sends in the adapter (3).Data-signal after the modulation is admitted to stereo recorder (4), and is recorded in one of them magnetic track of audio tape--data channel (such as L channel).The voice signal of microphone (2) output also is admitted to stereo recorder (4) by voice controller (24) afterwards, is recorded in another magnetic track of tape--sound channel (such as R channel).In addition, the control signal that the signal converter (25) in the transmission adapter (3) is exported teacher PC (1) is transformed into the desired signal form of remote control mouth (26) of recorder (4), and it also gives teacher PC (1) state feedback of recorder (4) simultaneously.

The present invention has utilized existing stereo equipment, propagates and store sound and computer data in teaching or the news.In order to make native system also compatible to normal stereophonic program, its solution is: set a transfer of data marker character in data flow, when in the system during transmission of data signals, receive adapter and can discern this marker character, automatically left and right sides two-way voice output (loud speaker) all is connected to sound channel and gets on, at this moment output is monophonic; After DTD, recover normal stereophony automatically.

Be recorded in voice signal and data-signal in teacher's terminal audio tape, can pass through transmission medium (5), (as, the stereophonic broadcasting net is propagated, perhaps duplicating, transmitting and playing) by tape, send into the reception adapter (6) of student terminal, this reception adapter comprises data demodulator (29), signal converter (28) and voice controller (30).Data-signal wherein is reduced into computer data by the data demodulator (29) that receives adapter (6) lining, sends into student PC (7); Voice signal is given loud speaker (8) by voice controller (30).Receive the marker character of the transfer of data of adapter (6) in can also the recognition data passage, according to this marker character, by voice controller (30) " stereo/monophonic " being carried out in the output of sound automatically switches, for example: when the equipment (recorder and receiver) of receiving terminal when being used for teaching purpose, the pairing loud speaker of data channel (such as the loud speaker on left road) is connected to sound channel get on (such as R channel), at this moment, the loudspeaker plays of left and right sides two-way all is sound in the sound channel; And when receive or play be normal stereophonic signal the time, two sound channels about the loud speaker of left and right sides two-way connects are respectively play stereo.In addition, receive the signal converter (28) of adapter (6) lining, student PC (7) is transformed into the desired signal form of remote control mouth (27) of recorder to the control signal of recorder (6), also give student PC (7) state feedback of recorder (9) simultaneously.

Similar with teacher PC, the system data of student PC (7) is the base program that moves among the student PC, or perhaps student's employed instrument of when study of listening to the teacher.The system data of student PC (7) leaves in the interior system disk (32) of student PC, calls in its service area (33) during use.By receiving the data that adapter (6) sends here will be foundation with the P-parameter in the packet at first, packet is carried out EDC error detection and correction one by one handle, (comprise certainly P-parameter itself carried out EDC error detection and correction), and then data block wherein sorted; The data of carrying textbook content are reassembled into the teaching material file, deposit the file area (34) among the student PC in; Synchronizing signal then is sent to the service area (33) of student PC.According to the instruction in the synchronizing signal, student PC calls a subprogram by teacher PC appointment, and the parameter that one group of teacher PC is sent here is processed into visual information, is shown to the student.This group parameter may be just in synchronizing signal, also may be the filename of teaching material data of the lining, file area (34) of transmitting and being stored in student PC in advance.In a word, by the program running of synchronizing signal teacher PC control student PC (7) lining, the many and teaching process of control student terminal, and make sound and V. A. synchronous, thus make the transmission time of the imperceptible teaching material data of student.

In the present embodiment, adopted computer serial i/O interface (V-24 or claim RS-232 interface) and asynchronous transmission rules (" stopping/initial " transmission protocol), and with " initial symbol " more than 20, continuous in the bit stream as " isolation accords with ".The isolation symbol is not only the list separator between the packet, and it can also be confined to the mistake in the transmission in the packet effectively, and does not influence other packet.

Student PC (7) can be connected with reception adapter (6) by its serial i/O interface (V-24/RS-232 interface) or bus interface (PC-Bus), and input/output port (31) is used to manage this interface.Student PC (7) also carries out remote control by input/output port (31) to recorder (9), this distant control function provides the possibility of a hardware error correction for system: when student PC (7) finds data transmission fault, its order recorder is refunded one section to tape, and then the signal on the playback tape, at this moment utilize the sequence number of P-parameter in the packet, find desired packet, correct this wrong data.By the also output of may command sound of input/output port (31) student PC (7).

Referring to Fig. 3-Figure 13, show the circuit and the operation principle thereof that send adapter and receive adapter.

Shown in Figure 3 is the example that sends modulation circuit in the adapter.It is a pulse-amplitude (PAM) modulation circuit.Computer data is sent into from input TD (61), and is become the DI signal (a is capable among Fig. 4) of TTL-level by level shifting circuit (62) through the TD of V-24 interface end.The DI signal by in the arteries and veins behind split circuit (63), produce R pulse (b is capable among Fig. 4), be used for reset clock signal generator (64), make clock pulse CLK (c is capable among Fig. 4) and DI signal Synchronization.Use the amplitude of DI signal change CLK pulse again: signal DI is fed to NAND gate (67) and not gate (68), and clock signal clk is fed to NAND gate (65) and not gate (66), the output termination NAND gate (69) of not gate (66) and (68).The device of collector electrode output open circuit is all adopted in NAND gate (65), (67) and (69), and as 74LS01, their output is by resistance string (73), and receive on the power Vcc (74) and (75).Behind the output process blocking capacitor (76) of NAND gate (67), just obtain the data-signal DO (d is capable among Fig. 4) of PAM-modulation.Each amplitude in the DO signal carries the information of a bit: logical one of high amplitude (Vup) expression, and logical zero of low amplitude (Vdn) expression, data-signal DO sends from data-signal output (79) after resistance (77) and (78) dividing potential drop.

What this circuit was exported is the square wave of PAM-modulation, and its high order harmonic component is attenuated by audio frequency apparatus the time, has become sine wave.In order to reduce the issuable harmful effect in transmission of these high order harmonic components, can carry out amplitude modulation with the direct offset of sinusoidal ripple of DI signal.

It shown in Fig. 5 the example that receives the demodulator circuit in the adapter.It is a pulse-amplitude (PAM) demodulator circuit.Data-signal through the PAM-modulation, after sending into from data-signal input (81), control its polarity and amplitude by potentiometer (82) and reversing switch (82 '), make and amplify back data-signal DI (a is capable among Fig. 6) through amplifier (86), recover original polarity, and its amplitude Vh should be about 5V, to satisfy the requirement of back circuit.Indicating circuit (87) is used to indicate its amplitude.When light-emitting diode DL1 was bright, the amplitude of expression DI met the requirements of lower limit; When light-emitting diode DL2 was bright, the amplitude of expression DI surpassed the upper limit that requires.The DI signal obtains its peak level Vh by peak sample circuit (83), uses potential divider (84) to obtain the median Vm of level Vh and V1, (capable referring to a among Fig. 6) again.The Vm level as a comparison-comparative level of limiting amplifier (85), the DI signal is delivered to the inverting input of amplifier (85), obtains the DT signal (b is capable among Fig. 6) of TTL-level after the amplification, gives the D end of D-trigger (90) again.In addition, the DI signal obtains the DK1 pulse (c is capable among Fig. 6) of TTL-level through limiting amplifier (88) afterwards, uses CK1 pulse-triggered monostable circuit (89) again, produces CK2 pulse (d is capable among Fig. 6), gives the CK end of D-trigger (90).So under the triggering on the back edge of CK2 pulse (upper punch), the DT signal is written into D-trigger (90).The DO signal (e is capable among Fig. 6) of D-trigger (90) Q end output is exactly the data flow after the demodulation, and it sends into the RD end of V-24 interface from output RD (95) after level shifting circuit (94) is converted into the V-24 level.In addition, the Vh level of peak sample circuit (83) output after level shifting circuit (96) converts the V-24 level to, as the status signal of demodulator, is sent into the DCD end of V-24 interface by output DCD (97).

In order to overcome the phase jitter that data flow produces in transmission, improve the adaptive capacity of demodulator, in another alternative embodiment of the present invention, available baud rate transducer shown in Figure 11 replaces D-trigger (90).At this moment, the DI of Figure 11 end is exactly the D end of D-trigger, and the CK end of Figure 11 is exactly the CK end of D-trigger, and the DO end of Figure 11 is exactly the Q end of D-trigger.Hereinafter also will address this.

Shown in Figure 7 is pulse-phase place (PPHM) modulator circuit, this circuit when carrier wave is carried out phase modulation, the amplitude modulation that can also add carrier wave.Computer data is sent into from input TD (101), and is become the DI signal (a is capable among Fig. 8) of TTL-level by level shifting circuit (102) through the TD of V-24 interface end.The DI signal produces R pulse (b is capable among Fig. 8) by behind the pulse edge split circuit (104), is used for reset clock signal generator (105), makes clock pulse CLK (c is capable among Fig. 8) and DI signal Synchronization.Trigger B1 (103), B2 (106) and B3 (107) form a shift register, and its serial input terminal connects the DI signal.Trigger B1 (103) and B3 (107) are triggered by the rising edge in the CLK arteries and veins, trigger B2 (106) is triggered by the trailing edge of CLK pulse (be anti-phase after CLK pulse-negative CLK), therefore, 1/2 clk cycle that lags behind successively between signal DI, B1 (d is capable among Fig. 8), B2 (e is capable among Fig. 8) and the B3 (f is capable among Fig. 8).B2 signal and negative CLK signal generate DT signal (h among Fig. 8 is capable), and B1 signal and B3 signal are through another XOR gate (109) afterwards through XOR gate (108) afterwards, generate PP signal (g among Fig. 8 is capable).

The DT signal is exactly the data-signal behind the PPHM-phase modulation, and its key character is: in the pairing moment of the rising edge of CLK pulse, its rising edge is represented a logical zero, and its trailing edge is represented a logical one; If to the DT sample of signal, will draw full of prunes result with the trailing edge of CLK pulse.Also carry the information that transmits to some extent in the PP signal.In this example, with the amplitude modulation that the DT pulse of PP signal after to phase modulation further adds, improve the amplitude of the radio-frequency component in the DT pulse, in order to overcome the decay of transmission medium-high frequency composition.The PP signal is to DT pulse amplitude modulation process, adopt with PAM-modulator (Fig. 3) in similarly circuit and element (65 to 79), the PPHM+PAM data-signal DO (i is capable among Fig. 8) after synthetic is sent by output DO.

The same with the PAM-modulator, the output of this circuit also is square wave, and its high order harmonic component is attenuated by audio frequency apparatus the time, has become sine wave.In order to reduce the issuable harmful effect in transmission of these high order harmonic components, can carry out amplitude modulation with the direct offset of sinusoidal ripple of DI signal.

Shown in Figure 9 is pulse-phase place (PPHM) demodulator circuit.Through the data-signal of PPHM-modulation, send into from data-signal input (120), after amplifying through limiting amplifier (121 and 122), obtain the DI signal (a among Figure 10 is capable) of TTL-level.The DI signal produces R pulse (b is capable among Figure 10) along through behind the pulse edge split circuit (124), is used to trigger monostable circuit (125), produces CK1 pulse (c is capable among Figure 10).Monostable circuit (127) is triggered in forward position with the CK1 pulse, produces CK2 pulse (d is capable among Figure 10), and delivers to the CK end of D-trigger (123), and the D termination DI signal of D-trigger (123).So under the triggering on the back edge of CK2 pulse (upper punch), the DI signal is written into D-trigger (123).The DO signal (e is capable among Figure 10) of D-trigger (123) Q end output is exactly the data flow after the demodulation, and it sends into the RD end of V-24 interface from output RD (130) after level shifting circuit (129) is converted into the V-24 level.In addition, the CK1 signal changes the V-24-level into by level shifting circuit (132) again after peak sample circuit (131) sampling, as the status signal of demodulator, is given the DCD end of V-24 interface by output DCD (133).

As previously described, the forward position of CK1 pulse (upper punch) should with the DI signal in carry the pulse edge accurate synchronization of information, this point is very important, if otherwise can demodulate wrong.Synchronized relation that the half of expression in a left side among Figure 10 is wrong and the error result that draws, right one side of something is only correct relation and result, and mid portion is then represented a correction procedure--CK1 pulse and DI signal synchronous automatically.The transient state cycle of monostable circuit (125) should be less than the DI signal period, greater than 1/2 of the DI signal period, (in this example adopt DI signal period 3/4), and the CK1 pulse of its output (by the NOR gate of self input) can block the R signal, thus realize this automatic synchronizing process.Therefore, the variation of symbol each time (become logical zero from logical one, perhaps become logical one) in the DI data flow from logical zero, monostable circuit (125) can both be from the synchronized relation of CK1 signal of dynamic(al) correction and DI signal.

In order to overcome the phase jitter that data flow produces in transmission, improve the adaptive capacity of demodulator, available baud rate transducer shown in Figure 11 replaces D-and touches with device (123).At this moment, the DI of Figure 11 end is exactly the D end of D-trigger, and the CK end of Figure 11 is exactly the CK end of D-trigger, and the DO end of Figure 11 is exactly the Q end of D-trigger.

Figure 11 shows the circuit of baud rate transducer.Because data-signal is interfered in transmission course and produces distortion, the speed of the data flow after the demodulation and phase place may serious unstable and shakes.This circuit is used for speed and the serious data flow unstable and shake of phase place are transformed into the data flow of speed and phase stabilization, and then sends into computer, thereby improves the reliability of system.The baud rate of this circuit output should be higher than the highest baud rate that may occur in the data flow of input.And the transmission rate of the effective information of output and input is the same.This circuit can be used for replacing D-trigger (90) and the middle D-trigger (123) of PPHM-demodulator (Fig. 9) in the PAM-demodulator (Fig. 5), at this moment, the DI end of transducer is exactly the D end of D-trigger, and the CK end is exactly the CK end of D-trigger, and the DO end is exactly a D-trigger Q end.

The data format of serial transmission is in the following description: 8 data bit, and no parity bit, position of rest is arbitrarily long.When adopting other data format, only need some numerical value are wherein pressed in like manner change a little, just applicable.

Input traffic is sent into from input CK from input DI, clock signal among Figure 11.This circuit will be processed this data flow DI by asynchronous transmission rules (initial/as to stop-transmission protocol): at each byte (back of when parity bit is arranged (if, comprise parity code), suitable " stop element " in the interpolation; In the back of each " blank character ", suitable " initial symbol " in the interpolation, then with stable, clock pulse drives faster, the serial data of newly forming is sent from output DO.This circuit is defined as " blank character " with N above continuous " initial symbol ".Under desirable inerrancy state, because each byte is finished by one " stop element ", so 10 continuous " initial symbols " should not arranged in the data flow of serial all by one " initial symbol " beginning in the serial data.But should adopt N 〉=20 in actual applications, as, the present invention adopts N=24.

SIPO is a m+1 position, seal in/and go out-shift register (Qm ..., Q1, Q0), 20≤m≤(N+9) wherein.The serial input terminal SI of SIPO connects data flow DI, and its input end of clock CK connects clock CK.Under the driving of CK pulse, data flow DI is shifted to Q0 from Qm in SIPO.Its parallel output terminal Q9～Q0 connects parallel input P9～P0 of shift register PISO respectively.

PISO ' be one 10, incorporate into/go here and there out-shift register, (P9 ..., P1, P0).Its parallel input drive end P/S connects (holding from D-trigger Q) parallel transmission order--PL pulse, and under the driving of PL pulse (PL is the H-level), the data of Q9-Q0 are respectively charged in the P9-P0 of PISO ' register during SIPO ' register.Thereby making the data among the data flow DI, is unit with the byte, sends into shift register PISO ' from shift register SIPO concurrently.In addition, the serial input terminal ST of PISO ' connects (holding from RS-trigger Q) SOUT signal, is used for inserting " stop element " or " initial symbol " that will add at output stream.The input end of clock CK of PISO ' connects internal clocking--the clock pulse of phase stabilization, and under the driving of clock pulse, the data in PISO ' register are shifted to P0 from P9, and SO sends from serial output terminal.

Counter CB, D-trigger and three ends are used for producing the parallel transmission order with door AND--in the PL arteries and veins.Counter CB to CK pulse count, when the count value of CB was 10, its counting output (the CO end is the H-level) by the blockade end INH of self, made counter CB stop counting.Its expression; In shift register SIPO, the transmission of previous byte is finished, and waits for the beginning of next byte, (Q0 is " an initial symbol ").At this (CO end H-level) afterwards, when the Q0 of SIPO shift register brings out existing " initial symbol " (Q0 is the L-level), and when " blank character " (SOUT is the H-level) not occurring, just send parallel transmission request--a PR signal with door AND.The PR signal is sent to the D end of D-trigger, and the CK of D-trigger end connects internal clocking clock pulse, therefore, receive PR request (PR is the H-level) afterwards at the D-trigger, the forward position of first clock pulse (upper punch), the D-trigger is set (for " 1 "), exports a parallel transmission order--PL pulse (PL is the H-level).The PL pulse is admitted to the P/S end of shift register PISO on the one hand, thereby finishes the parallel transmission of a data byte between shift register SIPO and the PISO '; On the other hand, the PL pulse is admitted to the RES end of counter CB, is used to remove the blockade to CB, begins next byte count.Clock pulse back edge (dashing down) after anti-phase and differential, makes the D-trigger reset, removes in the PL arteries and veins, finishes current parallel transmission.

Counter CN and RS-trigger are used for identification " blank character " and set up the SOUT state.The counting input end of counter CN (CK) connects clock pulse CK, and its reset terminal (RES) connects the Qm end of shift register SIPO.Counter CN, therefore, has only when occurring N " initial symbol " on the Qm continuously on the other hand again by " stop element " zero clearing on the Qm on the one hand to the CK step-by-step counting, and the count value of CN just can equal N, promptly represents to occur among the data flow DI " blank character ".This hour counter CN (by its terminal count output CO) makes RS-trigger reset (for " 0 "), sets up the SOUT state, sends SOUT signal (L-level).The S end of RS-trigger connects the Q10 end of shift register SIPO, and when " stop element " occurring on the Q10 end, RS-triggers to think highly of and is set (reverting to " 1 "), finishes the SOUT state.The SOUT signal is sent to the SI end of PISO shift register, its effect is: when transmission " blank character " (SOUT is the L-level), it inserts " initial symbol " in the data flow of output, when transmitted data byte (this H-level of SOUT), it inserts " stop element " in each byte back of the data flow of output.The SOUT signal also is admitted to and door AND, is used for blocking parallel transmission request PR during the SOUT.In addition, after the time discriminating of SOUT signal process RC-circuit and the level of Schmidt-not circuit are differentiated, as the marker character of transfer of data, DF sends by output, is used for controlling " stereo/monophonic " diverter switch of voice controller (Figure 12).

Figure 12 is the circuit of signal converter and voice controller, wherein, signal converter is used for the serial control signal of computer output is changed into parallel control signal, gives recorder remote control mouth, and voice controller is used to control the voice output of left and right sides two-way loud speaker.

Computer is held through the DTR of V-24 interface end and RTS the control signal of recorder, send into from input DTR (141) and input TRS (142) respectively, convert the DTR signal (a among Figure 13 is capable) and the TRS signal (b among Figure 13 is capable) of TTL-level to through level shifting circuit (143 and 144), wherein in the DTR signal control information is arranged, clock information is arranged among the TRS.The RTS signal of DTFR signal is sent into the serial data input SI and the input end of clock CK of shift register (145) respectively.Seven registers, D0-D6 are arranged in the shift register (145).Under the driving of RTS pulse, the control signal DTR of serial enters shift register (145) from serial input port SI, is shifted to D6 from D0, is transformed into parallel control signal, exports from parallel port D0-D6.Figure 13 represents a control command, and it is made up of one group in the RTS signal (seven) pulse and DTR signal.The DTR signal carries control signal to recorder in the mode of the time interval in the arteries and veins and sequencing, and its order correspondence the function of recorder, and control signal output ends (150-155) also is tactic according to this.The RTS pulse then is the time standard that the DTR signal is sampled.The RTS pulse makes time-discriminating circuit (146), upset (output L-level), in the end after the RTS pulse appropriate time later, (time of delay should greater than the cycle of RTS pulse), circuit (146) recovers (output H-level), thereby obtains RT1 signal (c is capable among Figure 13).Monostable circuit (147) is triggered along (upper punch) in this back of TR1 pulse, produces TR2 pulse (d is capable among Figure 13).The TR2 pulse is used to open AND circuit group (149), and (the parallel control signal of (D0-D5) is delivered to control signal output ends (150-155), by giving the remote control mouth of recorder here shift register (145) lining.

Audio input end SC and DC are connected the sound channel (for example L channel) and the data channel (for example R channel) of stereo equipment output respectively, audio output LO and two loud speakers about RO is connected respectively.Transfer of data marker character from baud rate transducer (Figure 11) is sent into from input DF, be used for control " stereo/monophonic " diverter switch, when the system transmissions data-signal, the sound device (LO end) on the left side is received right loud speaker (SC end) and is got on, when the normal stereophonic program of system transmissions, the loud speaker on the left side (LO end) is received L channel (DC end) and is got on.Last D6 of shift register (145) is used to control the output of sound simultaneously.Under the TR2 pulsed drive, the state of D6 is written into D-trigger (148), the output of D-trigger (148) is used for control audio output switch (156), therefore by setting to the D6 position, computer can cut off or connect the voice output of left and right sides two-way loud speaker, thus the compatibility of realization and existing stereo equipment.

When recorder has the Serial Control mouth, only need through simple level translation, the DTR signal in the V-24 interface just can directly be sent into the Serial Control mouth of recorder, and the TRS signal is direct control audio output switch (156) just.

In above-described tutoring system is the computer teaching system of " basic model ", voice signal keeps original form from start to finish always in the system of this basic model, do not have processed processing, and transmit in a sequential manner and be recorded on the tape.Yet in field research, teaching process but often needs to adjust randomly variation, such as, to student question the time, student's difference is answered will cause next step different content of courses.In other words, the flow process of giving lessons is not a line, but many bifurcateds are arranged, teaching process essential can be randomly forward or backward " redirect ".In the tutoring system of basic model, during teaching ground journey " redirect " voice signal read at random by tape " F.F. ", " fast fall " realizes that with " location of tape " wherein the sequence number in the P-parameter can also be as the foundation of fixing a point in the audio tape.In order to make system more flexible, according to a further aspect in the invention, also in all systems of aforementioned basic model, the computer teaching system of " enhancement mode " has been proposed, as shown in figure 14.

The present invention's's " enhancement mode " computer teaching system is the analog-to-digital conversion technology that further adopts on the basis of " basic model ", voice signal is carried out " packing ", " compression ", and sending out/receiving in the computer at two ends and setting up " sound buffer district ", can make receiving terminal can call voice signal randomly like this in certain scope, the operation that makes system more nimbly and freely.

For the expression that makes word clearer, hereinafter:

-" analog quantity channel " is corresponding to " sound channel " in above;

-" digital quantity passage " is corresponding to " data channel " in above;

-" data synchronizing signal " be corresponding to above " synchronizing signal ", so as with " synchronizing signal between sound " difference mutually;

" file area " (21 among the Fig. 2 and 34) in the text promptly gone up in-" data buffer zone ", so that distinguish mutually with " sound buffer district ";

-" remote control conversion " is corresponding to above " conversion of signals " (25 among Fig. 2 and 28);

In the tutoring system of enhancement mode, the processing procedure of voice signal can be expressed as follows simply:

The input of teacher's terminal media student terminal---preprocessing+temporary------〉transmission--------〉wise man deposit+reduce---output sound----〉digital quantity-------analog signals-------digital quantity----〉sound----〉A/D---------〉D/A-------------A/D--------〉D/A--〉

This processing procedure of F1 Fh Fh F1 has the following advantages:

-adopted " A/D-D/A " transfer process twice, therefore

-can carry out processed to (the digital quantity form) voice signal with computer at Faculty and Students ends, (as, to the packing of voice signal and unpack, compress and reduce);

-simultaneously, voice signal is again to propagate and store by transmission medium with analog quantity form (but not being original voice signal), can avoid like this because after the digitlization of voice signal, thereby data volume increases severely and need enlarge the requirement of the passband of transmission channel, therefore can utilize existing stereo equipment transmission and storage.

-can compress voice signal, thus can save between transmission advances, can be used for transmitting more voice signal.

-after packing and compression, multi-channel sound signal can be mixed, transmit by a passage, i.e. multichannel sterego.

-can be at any time according to the size of the amount of information of auditory information, in time change compression ratio, adjust the transmission rate in the transmission and the relation of passband, under the not obvious prerequisite that influences sound quality, make the efficient of system at one's best at any time.

The packing of voice signal is finished like this.In teacher's terminal, be admitted to an A/D converter from the voice signal of sound source (as microphone), with F ₁Frequency it is sampled, convert it the signal of digital quantity form to.This digital quantity signal is sent into teacher's computers as data " string ", it is divided into " section "--sound clip by computer, and then the data of " section " lining are carried out " preprocessing ", as carry out sound compression (referring to the content of the relevant Signal Compression in front), and form the block data of carrying auditory information at last--be referred to as " sound chunk ".Simultaneously, computer also generates a label for each sound chunk, except the sequence number that this sound chunk is arranged, also carries its " restore information " in the label.Carry in the restore information this sound clip is carried out the preprocessing process for information about, use when holding this sound clip of reduction for the student.Sound chunk and its label are formed a voice packet together, promptly claim " packing ".And setting up " sound buffer district " (such as in hard disk) in the teacher's computers,--each sound chunk and its label are an elementary cell together--is temporarily stored in this sound buffer district, for transmission with voice packet.

When voice packet sends, teacher's computers will be by a certain order (the sending order problem back about voice packet also will go through), the voice packet that is temporarily stored in the sound buffer district is taken out one by one, sound chunk in the voice packet--is carried the data of one section acoustic information--and is admitted to a D/A converter, frequency with Fh, convert thereof into the signal of analog quantity form, then this analog signals is mail to student terminal by the analog quantity channel in the transmission medium; Label in the voice packet is then pressed computer data and is handled, and is processed to a kind of special packet--be referred to as " voice packet decollator ", with other packet together, mail to student terminal by the digital quantity passage in the transmission medium.In transmission, between the voice packet decollator in analog signals in the analog quantity channel and the digital quantity passage synchronized relation is arranged, that is to say, sound chunk through after the D/A conversion just in analog quantity channel to one section analog signals should be arranged, be to lean on the voice packet decollator in the digital quantity passage to divide between " section " and " section " in this signal.The beginning or the end of the one section analog signals (corresponding a sound chunk) in the analog quantity channel represented in the appearance of voice packet decollator in the digital quantity passage, and it is also carrying the label of this sound chunk simultaneously.Though the analog signals in the analog quantity channel is the audio signal of audible, it may be not original sound, because handled through preprocessing before this.

At student terminal, the analog signals of sending here by analog quantity channel is sampled to it with the frequency of Fh earlier through an A/D converter, reverts to the signal of digital quantity form--serial data, sends into student's computer then.Simultaneously, also send into computer after the demodulation of signal process demodulator in the digital quantity passage, computer therefrom sorts out the voice packet decollator, and the serial data of A/D converter being sent here according to these voice packet decollators is divided into piece-sound chunk, then these sound chunk (carrying in the decollator) label together with them--and remain a sound chunk and its label and be next elementary cell-leave in the sound buffer district of student's computer together.

The reduction process of sound is by sound synchronizing signal control, mainly contains the sequence number of or a string voice packet in the sound synchronizing signal.When the sound synchronizing signal occurs in student's computer, computer is according to the sequence number in the sound synchronizing signal (or sequence number string), from the sound buffer district, take out a corresponding voice packet one by one, with the data in the sound chunk in the bag, requirement by " restore information " in this bag label reduce (inverse process of preprocessing) handle, obtain the digital quantity signal of a sound clip, then this piece of digital amount signal is sent into a D/A converter, with the frequency of F1, it is reverted to final voice signal export by loud speaker.The sound synchronizing signal on the one hand by the digital quantity passage from the computer of teacher's terminal, on the other hand also can be by the program in the student terminal computer, according to interactive result (as, to student's enquirement test) produce.

The transmission of voice packet and transmission must be carried out in advance, are called pre-transmission.That is, before student terminal need be used a certain sound clip, the voice packet of this section sound must send and finish, and was stored in the sound buffer district of student's computer.The attention of sound clip need have a sound synchronizing signal, and the building-up process between final sound depends on the chronological order of sound synchronizing signal and the time that they occur.Therefore, as long as the capacity in the sound buffer district in the computer of Faculty and Students allows, the order that sends voice packet can be any, can transmit the voice packet from the alternative sounds source interspersedly.In the basic model of Miao Shuing, visual information is transmitted in advance in front.In enhanced system of the present invention, the packet that carries visual information all must transmit in advance with the voice packet of carrying auditory information.Presenting by data synchronizing signal control of visual signal, presenting by the control of sound synchronizing signal of voice signal then, organically connects sound and visual information with data synchronizing signal harmony synchronized hlda signal.The sending order table of voice packet and the layout of sound synchronizing signal will be different because of the particular content of giving lessons, and be realized by software.

In order to save the transmission time, voice signal is compressed, promptly the transmission time of voice signal is compressed.After " voice packet " and " sound synchronizing signal " technology that adopts, just might compress processing to the transmission time of sound.The time that saves after compression can be used for transmitting more voice signal.

At first, human language is a kind of very easy and transmit the mode of information efficiently, is the chief component of auditory information.Account for no small ratio and in speech signal, " pause at interval ".Therefore when the transmission speech, teacher's end is divided sound clip with " statement " in the language, is a voice packet in short promptly.Pause in the interval of not transmitting between sentence and the sentence, give the student computer of end but the time span of pausing is at interval put down in writing in the label of voice packet, so when the student holds recovery sound, computer just can automatically insert reasonable time at interval between two sound clips, thereby saves the transmission time.This way is certainly also applicable to the processing procedure of the natural sound of non-human language.

Secondly, in twice A/D-D/A transfer process, when F1＜Fh, required transmission time of each sound chunk is just less than actual holding time of this section voice signal.At this moment, voice signal is " squeezed. " in the A/D-D/A transfer process of teacher's end, as " record is put soon slowly "; Quilt " expansion " in the A/D-D/A transfer process of student's end is as " fast record is put slowly ".Fh should be decided by the passband of analog quantity channel, remains unchanged, and suitably reduces F1, reaches compression effects.Simultaneously, the teacher holds in the label that the situation of this compression (as, the value of F1) record must be gone into voice packet and is sent to student's end, holds the foundation of " expansion " when recovering this section sound, the foundation of changing the commentaries on classics frequency of promptly holding D/A converter as the student as the student.This compression to the voice packet transmission time also is one of highly effective means.

In this compression and reduction process, the transmission time of voice signal has been compressed F1/Fh, and simultaneously, the spectrum component of sound also has been compressed F1/Fh, so just look like that voice-grade channel (reality) passband of whole system also has been compressed F1/Fh.This processing procedure be with the content that does not influence auditory information (audibility), suitably to sacrifice some quality of information (a part of radio-frequency component of voice signal) be prerequisite.For example, when the frequency spectrum of speech signal is compressed to 3.4KHz, speech signal can from the degree constant substantially.The frequency spectrum of voice signal is reduced, but can transmit more voice signal in the same time, has increased the transmission of Information amount.

Because each voice packet all carries the numerical value of F1, teacher's end just can be according to the amount of information size of auditory information, at any time sound F1, in time the relation of (just between the transmission rate of voice signal and the transmission passband) between adjustment information flow and the quality of information makes the efficient of system at one's best all the time.

In order further to save the transmission time, the present invention has also adopted the measure of standardization voice packet.The sound clip that repeats is retained in the sound buffer district of student's computer, such voice packet need only transmission primaries, need only transmit when using it later on a sound synchronizing signal both can, thereby save the transmission time.So, can make some and the standardization of frequent statement, for example classroom term commonly used during teachers' instruction allows it reside in the sound buffer district of student's computer, thereby further saves the transmission time of voice signal.

Student terminal is according to restoring acoustical signal with the label in the voice packet.In the voice packet label except the sequence number that this voice packet is arranged, the feature that reflects this sound chunk in addition for information about, as the length of the frequency F1 of D/A conversion, dwell interval, whether will reside the sequence number of sound buffer district and next voice packet, or the like.Owing to adopted after sound packing, sound compression, pre-transmission, interspersed transmission technology and the sound buffering area, the student holds reading at random of voice signal just to become reading at random of data in the memory (as hard disk), and the variation that makes teaching process in the teaching more nimbly and freely.

Figure 14 shows the structure of enhancement mode computer teaching system of the present invention, it be on the basis of Fig. 2 in teacher PC (1) and student PC (7), increase " sound buffer district " (13 and 38) respectively, and change original " file area " (21 and 33) into " data buffer zone "; With " sound control " device (24 and 30) among mould-several or several weighted-voltage D/A converters " D/A-A/D " (14) and " A/D-D/A " (39) replacement Fig. 2.

Hold the teacher, A/D converter in " D/A-A/D " (14) from. the voice signal of microphone (2) is transformed into data and sends into teacher PC (1), district (13) was used for temporary voice packet after packing and preprocessing during sound was slow, and the D/A converter of lining, " D/A-A/D " (14) converts the sound chunk that will send to analog signals and sends into analog quantity channel in the transmission medium.Label in the voice packet is processed to voice packet decollator (packet), sends into digital quantity passage in the transmission medium through data modulator (23).

Hold the student, A/D converter in " A/D-D/A " (39) converts the analog signals from analog quantity channel to data and sends into student PC (7), sound buffer district (38) is used for keeping in the voice packet that receives, and the D/A converter in " A/D-D/A " (39) is used for becoming the reduction of data in the sound chunk voice signal to be exported by loud speaker (8).The voice packet decollator of digital quantity passage is after data demodulator (29) demodulation, and voice packet label wherein also deposits sound buffer district (38) in.

The scheme of utilizing the present invention that voice signal is packed, compressed can also be carried out timesharing transmission--the multi-audio television broadcasting of multi-channel sound signal.

Can only transmission of one line or two tunnel audio signals in existing television broadcasting.After adopting the packing and compress technique of voice signal, need only change a little existing equipment, just can the above audio signal of transmitting two paths.

Shown in the accompanying drawing 15 is the timesharing transmission course of a multi-channel sound signal.At transmitting terminal, from N sound source CHT-1, CHT-2 ..., the voice signal in the CHT-n sent into respectively corresponding A/D converter AD-1, AD-2 ..., AD-n.These A/D converters all with the sample frequency of F1, respectively this N road voice signal is carried out the A/D conversion, thereby row are to N road digital quantity signal.The time interval with Δ t cuts into piece--sound chunk to this N road digital quantity signal respectively again, and leave in respectively separately sound buffer district BT-1, BT-2 ..., among the BT-n.Diverter switch SWT with time interval of Δ t/N, with touring mode sequential access sound buffer district BT-1, BT-2 ..., BT-n, therefrom take out a sound chunk at every turn, send into D/A converter DA-T (buffering area).D/A converter DA-T doubly to the frequency of F1--Fh, converts the digital quantity signal in the sound chunk of sending into to analog signals with N, and CH-M is sent to receiving terminal by the main channel.So in the time cycle of Δ t, by this N road sound source CHT-1, CHT-2 ..., CHT-n generates a sound chunk respectively, deposit in corresponding sound buffer district BT-1, BT-2 ..., BT-n; Diverter switch SWT difference access voice buffering area BT-1, BT-2 ..., BT-n once, and therefrom take out a sound chunk and send into D/A converter DA-T; D/A converter DA-T has finished the D/A conversion of N sound chunk.The frequency spectrum of the analog signals in the CH-M of main channel be sound source frequency spectrum N doubly.

Simultaneously, transmitting terminal is at any time with the state of diverter switch SWT, promptly the beat of its change action and the sound of being visited slow in district's (being sound source) channel number together, as segmentation symbol, CH-H is sent to receiving terminal by accessory channel, is used to divide the analog signals in the CH-M of main channel.

The N of receiving terminal voice output channel C HR-1, CHR-2 ..., CHR-n, be respectively equipped with an A/D converter, DA-1, DA-2 ..., DA-n and a sound buffer district, BR-1, BR-2 ..., BR-n.Analog signals in the CH-M of main channel is sent to after the receiving terminal, earlier with A/D converter AD-R, with the sample frequency of Fh it is transformed into digital quantity signal.In accessory channel segmentation symbol synchronously down, switch and open and SWR cuts into sound chunk to this digital quantity signal, and according to the channel number in the segmentation symbol with its send into corresponding sound buffer district BR-1, BR-2 ..., BR-n.Sound buffer district BR-1, BR-2 ..., the digital quantity signal in the BR-n is by the D/A converter that is connected, DA-1, DA-2 ..., DA-n, F1 is reduced into voice signal with inversion frequency, respectively from output CHR-1, CHR-2 ..., CHR-n output.

Utilize this principle can be in existing television transmission and receiving equipment, sound channel as the main channel, suitably enlarge the frequency spectrum of the passband or the acoustic compression tone signal of sound channel, and, utilize some signal in the vision signal as segmentation symbol, for example, in field system chronizing impulse, embed suitable information (sound source channel number), be used to drive diverter switch SWT and SWR, just can transmit multi-channel sound signal, become the multi-audio television broadcasting system.

Segmentation symbol also can be used as a kind of identification mark of compatibility, drives relevant audio switch, makes novel multi-audio television receiver also can be applicable to the monophony TV programme.

In addition, can also in frequency modulation (stereo) broadcasting, utilize frequency modulation (as the main channel) the transportation simulator amount signal of carrier wave, utilize amplitude modulation (as accessory channel) the transmission segmentation symbol of carrier wave, the frequency band of the voice-grade channel of an original receipts/equipment need only be suitably enlarged, just the multiphonic stereo-phonism signal can be transmitted.

Although the above detailed description of in conjunction with the embodiments the present invention being carried out, those skilled in the art are appreciated that, in the spirit and scope of not leaving the present invention and appended claim book thereof, can make various modifications.

Claims (25)

1. method of transmitting the information of form of sound and data mode, information is wherein produced by a transmitting apparatus, can use for one or more than one receiving equipment, it is characterized in that the step is poly-:

Utilize stereo transmission and/or recording equipment to propagate these information, a passage in the equipment is used for voice signal, and another passage is used for the vision data signal.

2. the method for the dataform information of a character and graphic that transmits form of sound, wherein said acoustic information is a radio station broadcast signal, described data are and direct relevant literal and/or other the social public information of the picture person of being of broadcast content, the described information of form of sound and data mode that comprises is produced by a transmitting apparatus, received by one or an above receiving equipment, be it is characterized in that;

When station broadcast news or other public information, use a channel transfer sound (broadcast) signal of stereo transmission and/or recording equipment, another passage is used to transmit the computer data that carry social public information relevant with the content of broadcasting;

After an information (or a piece of news) is gathered by the radio station, by specific (database) data format it is edited and processed into computer data, and can send in the subscriber computer;

Utilize computer that this social public information storehouse is retrieved;

Information needed is presented at phosphor screen or is printed on the paper.

3. according to the method for claim 1 or 2, it is characterized in that transmitting described data-signal with the amplitude of carrier wave, the frequency of carrier wave equals the bit rate of described data in the base.

4. according to the method for claim 1 or 2, it is characterized in that the described data-signal of transmission of phase with carrier wave.

5. according to the method for claim 4, it is characterized in that the modulation that adds with the amplitude of the described carrier wave in ground.

6. according to the method for claim 1 or 2, it is characterized in that described vision data signal being connected with relevant described voice signal with synchronizing signal.

7. according to the method for claim 6, it is characterized in that transmitting in advance vision data, earlier receive and/or what obtain by broadcast is nine according to writing computer storage, then by means of described synchronizing signal by the described determined moment of related sound signal, these data are read out.

8. according to the method for claim 1 or 2, it is characterized in that described data-signal is divided into fault-tolerant data and not fault-tolerant data, and not fault-tolerant data are added error detection code and correction code.

9. method according to Claim 8, it is characterized in that described transmitting terminal is divided into the suitable data block of size by predefined procedure with described data message, and generate one group of P-parameter is handled this packet as receiving terminal foundation for each data block, this P-parameter carry this data block such as sequence number, size, check code, and features such as fault tolerance features and transmission destination; The P-parameter of each data block and it is formed a packet, sends together, separates with " blank character " between packet and the packet.

10. according to the method for claim 1 or 2, it is characterized in that in the pairing audio output circuit of described data channel, set up " stereo/monophonic " diverter switch, particular data when utilizing transfer of data in the data flow is marker character, drive described switch, so that transmit compatible mutually with normal stereophony.

11. according to the method for claim 1 or 2, the material that it is characterized in that being used to storing described information is audio tape or computer disk.

12., it is characterized in that also comprising the following steps: according to the method for claim 1

Adopt the A/D-D/A switch technology, described voice signal is packed, compressed at transmitting terminal;

Voice signal after above-mentioned processing is transferred to receiving terminal through sound channel, utilizes the D/A-A/D switch technology at receiving terminal, and described voice signal is unpacked and reduces;

Receiving/sending out in the computer of two ends and setting up the sound buffer district respectively, in order to the acoustic information after the temporary described preprocessing.

13. method according to claim 12, it is characterized in that sending in advance the voice packet of carrying the vision data bag and carrying auditory information, wherein, presenting by data synchronizing signal of visual signal controlled, presenting by the control of sound synchronizing signal of voice signal, factor organically connects sound and visual information according to synchronizing signal harmony synchronized hlda signal.

14. method according to claim 12, the label that it is characterized in that described voice signal through packing, comprise the sequence number of this voice packet and reflect the information that this sound chunk feature is relevant, comprise: frequency F1, the dwell interval length of D/A conversion, whether to reside sound slow in the district, and the sequence number of next voice packet.

15., it is characterized in that described compression to voice signal further comprises the following steps or one of the following step according to the method for claim 14:

The statement that does not transmit voice signal pauses at interval, and the statement gap length is put down in writing in the label of voice packet, and receiving end computer inserts reasonable time at interval automatically according to the record in the label when recovering signal;

In the A/D-D/A of transmitting terminal transfer process, F ₁(A/D frequency)＜F _h(D/A frequency), voice signal is compressed, and F ₁Value put down in writing in the label of voice packet and be sent to receiving terminal, as the foundation of the inversion frequency of receiving terminal D/A converter;

The sound clip that repeats is stored in the receiving terminal sound buffer district, and such voice packet transmission primaries then only transmits a sound synchronizing signal later on and just can read this voice packet.

16., it is characterized in that further comprising the steps of: will send into N corresponding A/D converter respectively from the voice signal of N sound source at transmitting terminal, and obtain N digital signal according to the method for claim 2;

The time interval with Δ t is divided into sound chunk respectively with described N way word signal, is temporarily stored in the sound buffer district separately;

Diverter switch SWT with the slow middle district of touring mode sequential access sound, therefrom takes out a sound chunk with the Δ t/N time interval at every turn, sends into the buffering area of D/A converter DA-T;

Described DA-T with N doubly to F ₁Frequency Fh, described digital signal is converted to analog signal, give receiving terminal by the main channel;

The described analog signal that sends to receiving terminal, by A/D converter AD-R, sample frequency with Fh is converted into digital signal, in descending synchronously of accessory channel segmentation symbol, diverter switch SWR is divided into sound chunk, and it is sent into corresponding sound buffer district according to the channel number in the segmentation symbol, again by the D/A converter that is connected, with inversion frequency F ₁Be reduced into voice signal, export from output separately respectively.

17. be used to transmit the system of the information of form of sound and data mode, in this system, described data are sent by a transmitting apparatus, can use for one or more receiving equipments, it is characterized in that

Described transmitting apparatus comprises the sound source that is used to produce the computer of vision data and is used to produce voice signal, one with computer interface and be used to process the transmission adapter of computer-generated data and voice signal and a stereo receiver or a stereo broadcast transmitter that is used to write down or transmit data and voice signal;

Described receiving equipment comprises that one one is used to reset or receives the vision data that produced by transmitter and the stereo receiver or the stereo radio receiver of voice signal, one is used for the data that demodulation receives and the reception adapter of voice signal, and a computer.

18. according to the system of claim 17, it is characterized in that described transmitting apparatus and receiving equipment also comprise synchronizer respectively, in order to described vision data and relevant voice signal synchronised.

19., it is characterized in that described transmission adapter comprises a modulator at least, is used to process computer-generated data according to the system of claim 17; Described reception adapter comprises a demodulator at least, is used to process the data of sending into computer.

20., it is characterized in that described transmission and receive remote signal interface and the voice controller that adapter also further comprises a stereo receiver respectively according to the system of claim 19.

21., it is characterized in that the demodulator of described reception adapter also comprises a baud rate transducer, in order to overcome the phase jitter that data flow produces in transmission according to the system of claim 19.

22. system according to claim 17, it is characterized in that being arranged at occur frequently " stereo/monophonic " diverter switch in the circuit of system data passage institute diaphone, the particular data in order to according to transfer of data the time in the data flow is that mark carries out the switching of " stereo/monophonic ".

23. according to the system of claim 17, the material that it is characterized in that being used to storing described information is audio tape or computer disk.

24., it is characterized in that described system also further comprises according to the system of claim 17:

Be arranged at the data buffer zone of transmitting terminal and receiving terminal, respectively in order to the storage vision data;

Be arranged at the sound buffer district of transmitting terminal and receiving terminal, respectively in order to store through packing and preprocessing and voice signal bag to be restored;

Be arranged at the A/D-D/A transducer of transmitting terminal and receiving terminal, in order to respectively the signal of transmitting terminal and receiving terminal is carried out twice A/D-D/A conversion, so that respectively voice signal is packed, compressed and unpack, reduces.

25., it is characterized in that this system further comprises the voice signal synchronizer according to the system of claim 24, utilize synchronizing signal in described sound buffer district, to take out corresponding voice packet one by one at receiving terminal, carry out the reduction of voice signal.

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