CN1148297A - Frequency modulation L-R data broadcast system, and method for treating data signals therefor - Google Patents
Frequency modulation L-R data broadcast system, and method for treating data signals therefor Download PDFInfo
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- CN1148297A CN1148297A CN 95118718 CN95118718A CN1148297A CN 1148297 A CN1148297 A CN 1148297A CN 95118718 CN95118718 CN 95118718 CN 95118718 A CN95118718 A CN 95118718A CN 1148297 A CN1148297 A CN 1148297A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
- H04H20/33—Arrangements for simultaneous broadcast of plural pieces of information by plural channels
- H04H20/34—Arrangements for simultaneous broadcast of plural pieces of information by plural channels using an out-of-band subcarrier signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/44—Arrangements characterised by circuits or components specially adapted for broadcast
- H04H20/46—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95
- H04H20/47—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems
- H04H20/48—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems for FM stereophonic broadcast systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
- H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
- H04H40/36—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving
- H04H40/45—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving for FM stereophonic broadcast systems receiving
- H04H40/81—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving for FM stereophonic broadcast systems receiving for stereo-monaural switching
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Abstract
The frequency-modulated L-R data broadcast system includes transmitting portion and receiving portion, input end, stereophonic coder and output end. Said system is characterized by that its transmitting portion also includes a data transmission portion, first change-over switch, second change-over switch and a mode control end, and its receiving portion also includes a data receiving portion, a band-pass filter, a pilot frequency recognizer and a third change-over switch. Said system can be compatible with the existent FM broadcast system, can effectively transmit data, and doesnot affect the receiving of voice signal.
Description
The present invention relates in existing FM stereophonic broadcast, when compatibility is carried out data broadcasting, method that data-signal is handled and compatible solution.The processing method of this data-signal also can be applicable to other data transmission system.
Language (speaking) and music are two chief components of sound radio.For stereophony broadcasting, the stereophonic effect of voice broadcast program does not have any practical significance.In existing stereophonic broadcasting, in fact the signal source of voice program has only one.This road voice signal (the bifurcation X among Fig. 1) before sending just is divided into a left side (L), right (R) two-way, uses two Channel Transmission then respectively, until left and right two ears of listener.Obviously, if this road voice signal is arrived after the receiving terminal, as the bifurcation Y in Fig. 2, just be divided into left and right two-way, two ears of dispensing listener, its actual audibility and the former are duplicate, transmission channel and transmittability under but can saving, be used for data signal, carry out data broadcasting.The broadcast mode of this " monophony+data " is applicable to during the broadcast of all monophony programs of stereophonic broadcasting radio station.
Same inventor of the present invention was called in the patent application of " processing of data-signal and transmission method " to the 94103324.4th the name that Patent Office of the People's Republic of China proposes on March 24th, 1994, had proposed to carry out simultaneously in stereophonic broadcasting and recording equipment the method for voice and data broadcasting and record.This document this draw be incorporated into as list of references of the present invention of the present invention open among.
One of purpose of the present invention is, make existing fm stereo broadcast system possess dual track " stereo " and " monophony+data " two kinds of broadcast modes, compatible between these two kinds of patterns, can flexible conversion, thus be implemented in data broadcasting in the FM stereophonic broadcast.The meaning of " monophony+data " broadcast mode is further to utilize the transmission potentiality of existing FM broadcasting.
In FM stereophonic broadcast, carry out " monophony+data " broadcasting two kinds of possible modes arranged:
1) directly utilizes a sound channel transmission of data signals in the stereophonic sound system; Another sound channel transmission voice signal.The advantage of this mode is: one. can utilize existing stereophonic broadcasting and sound pick-up outfit, synchronous transmission and recording voice and data-signal; Two. data-signal need not conversion, just can transfer between different stereophonic broadcast system (as frequency modulation, amplitude modulation and wired broadcasting) and recording and/or reproducing apparatus.Its shortcoming is: one. existing FM receiver and stereo recording and/or reproducing apparatus must add a compatible circuit, could get rid of data-signal harassing sound automatically; Two. the utilance of transmission channel is low.
2) " left side+right side " channel (claiming the L+R channel again) with 0 ∽ 15KHz transmits voice signal, with the frequency range more than the 19KHz, as " L-R " channel (claiming the L-R channel again) of 23 ∽ 53KHz, transmission of data signals, and close the stereo pilot signal of 19KHz, as the data broadcasting mark.This broadcast mode is compatible fully to existing FM broadcasting broadcast receiver, and has the message transmission rate height, the characteristics that the data-signal antijamming capability is strong.This broadcast mode is called " frequency modulation L-R data broadcasting ".
The system that carries out frequency modulation L-R data broadcasting of the present invention, comprise a radiating portion and a receiving unit, described radiating portion comprises: the input with left and right two sound channels (L, R), a stereophonic encoder, with an output, described receiving unit comprises a receiving terminal, a stereodecoder and an output; Also comprise sending part: a data sending part branch is used to provide and wants data signals transmitted; First change over switch (KS1) is arranged between DSB-SC modulator, data transmission part and the band pass filter; Be used for selectively receiving data-signal or audio signal; Second change over switch (KS2) is arranged between frequency divider and the narrow band filter, is used for selectively being switched on or switched off pilot frequency information; A pattern control end, (KS1, KS2) links to each other with first, second switch, is used for the state of control switch, and the pattern control end also sends with data and links to each other, and is used for the control data sending part and divides the transmission data-signal; Also comprise at receiving unit: a data receiving unit is used to receive the data-signal (DT) that is sent; A band pass filter, its input links to each other with described receiving terminal, is used for isolating data-signal (DT) from the broadcast baseband signal; A pilot tone identifier, its input also links to each other with described receiving terminal, is used to discern pilot signal, and in its output output mode control signal (mode); One the 3rd change over switch (KR) is arranged between described band pass filter and the described data reception portion branch, and links to each other with the output of pilot tone identifier; Wherein, the mode control signal of described pilot tone identifier output is selectively sent data-signal (DT) into data decoder by the 3rd change over switch (KR), is reduced into the data flow that is transmitted.
The present invention will be elaborated by the following drawings, wherein:
Fig. 1 shows the communication mode of voice signal in the existing stereophonic broadcasting;
Fig. 2 is the broadcast mode of " monophony+data ";
Fig. 3 is the principle of frequency modulation of the present invention " stereo "/" monophony+data " broadcasting;
Fig. 4 shows the schematic diagram of stereodecoder;
The binary decoding schematic diagram of sign indicating number that broadens when Fig. 5 shows L-max=1 of the present invention;
Fig. 6 is the fundamental diagram of wave-form synthesizer of the present invention;
Fig. 7 shows a kind of signal waveform and frequency spectrum of the sign indicating number that broadens.
Fig. 3 represents according to the present invention the operation principle of in fm stereo broadcast system compatible " L-R data broadcasting ".The broadcast transmission end need increase a data sending part branch, the control signal (mode) that one " stereo "/" monophony+data " broadcast mode is selected, and in the stereo coding circuit of routine, increase a pair of mode selector switch (KS1, KS2).The broadcast reception end, the Data Receiving part is grouped into by 23 ∽ 53KHz band pass filters, pilot tone identifier, mode switch (KR) and data reception portion.
When carrying out stereophonic broadcasting, the mode signal of transmitting terminal makes data send quitting work of part, and makes the stereophonic encoder operate as normal: after the input signal of left and right two-way sound (L, the R) addition and signal (L+R signal) use the L+R Channel Transmission; Their difference signal (L-R signal) carries out carrier-suppressed double sideband amplitude modulation (DSB-SC) afterwards to the carrier wave of paying of 38KHz, and uses the L-R Channel Transmission; Pay carrier signal obtains 19KHz after two divided-frequency stereo pilot signal; These three signals are superimposed with RDS and SCA signal in case of necessity again in the stack of superimposer (∑) lining, just obtain normal FM broadcasting baseband signal.The broadcast baseband signal is sent by transmitter, by the frequency discriminator reduction of receiver.At receiving terminal, the pilot signal in the broadcast baseband signal makes the set of pilot tone identifier.The output of pilot tone identifier (mode) partly quits work Data Receiving by the input that K switch R cuts off the data receiving unit.Pilot signal in the broadcast baseband signal makes the stereodecoder operate as normal, and Fig. 4 represents its operation principle: the narrow band filter by 19KHz is isolated pilot signal from baseband signal; Pilot signal is after two frequencys multiplication, and reduction draws the carrier wave of paying of 38KHz; With the DSB-SC signal multiplication (demodulation) in this pair carrier wave and the 23 ∽ 53KHz frequency ranges, product signal just restores the L-R signal by after the low-pass filtering of one 0 ∽ 15KHz again; Carry out addition with the L+R signal in L-R signal and the L+R channel at last and subtract each other, obtain the output signal (L, R) of left and right two-way sound respectively.
When carrying out frequency modulation L-R data broadcasting, voice signal (L+R signal) still uses the L+R channel to transmit.Under the control of transmitting terminal mode signal, data send part data flow (data) are converted to data-signal (DT); The KS1 switch cuts off the DSB-SC signal in the stereophonic encoder, makes the DT signal send into superimposer (∑) through the band pass filter of 23 ∽ 53KHz; The KS2 switch cuts off the 19KHz pilot signal.Comprise the voice signal of 0 ∽ 15KHz and the data-signal of 23 ∽ 53KHzs in the broadcast baseband signal this moment, do not have the stereo pilot signal.At receiving terminal, from the broadcast baseband signal, isolate data-signal DT by the band pass filter of 23 ∽ 53KHz.Because do not have pilot signal in the broadcast baseband signal, the pilot tone identifier is by zero setting.The output of pilot tone identifier (mode) is sent into the Data Receiving part to data-signal DT by the KR switch, is the data flow (data) that is transmitted after the reduction.At this moment in stereodecoder, owing to there is not the pilot signal of 19KHz in the broadcast baseband signal, can't frequency multiplication go out the carrier wave of paying of 38KHz.So, through multiplier (*) afterwards data-signal still keep the signal form of original 23 ∽ 53KHz, this signal will be by the audio frequency filter circuit filtering of back.At this moment the L-R signal is zero, and it is with the L+R signal plus and subtract each other the result, the two-way of stereodecoder is exported all be the voice signal in the L+R channel.That is to say that L+R signal at this moment is divided into left and right two-way in stereodecoder.
Therefore, when carrying out frequency modulation L-R data broadcasting, use common FM receiver, no matter be stereo or monaural, two ears of people can both and can only be heard the voice signal in the L+R channel, can't hear the data-signal in the L-R channel.In case occur pilot signal in the FM broadcasting, stereodecoder recovers normal stereo decoding, and data processor stops data demodulates.Here it is " frequency modulation L-R data broadcasting " and existing " FM stereophonic broadcast " compatible principle." pilot tone indication " signal of stereodecoder output also can be used as the mode control signal (mode) of receiving terminal.
Broadcast mode can be provided with by the mode input of transmitting terminal, also can realize control automatically by a signal comparator.Its principle is: L, R two-way audio input signal are compared.When L, R two-way sound the same (L-R ≈ 0), start necessary process of decision, make the selection decision of broadcast mode.
Broadcast when relaying, the audio frequency of the receiving equipment of relay station output (L, R) is directly connected to the audio input end of transmitting apparatus, and (L, R), the mode of receiving equipment output is directly connected to the mode input of transmitting apparatus.When carrying out the relay of data broadcasting, relay station need not data and sends part and Data Receiving part, and directly the DT output with receiving equipment connects the DT input of giving transmitter.Relay station also can change the content of data broadcasting, at this moment needs a data processor between the data of the data of receiving equipment output and transmitter input, revises the content of data flow.
When carrying out stereophonic broadcasting, may " lose " phenomenon owing to pilot signal appears in the reason of disturbing, at this moment the DSB-SC signal in the L-R channel can be misinterpreted as data-signal.Therefore the data of being transmitted should possess certain error detecing capability.In a single day the Data Receiving part is found misdata, just abandoned.
The key that realizes frequency modulation L-R data broadcasting is: one. the effective spectrum of data-signal is all concentrated in the frequency range of 23 ∽ 53KHz; Two. data-signal is to the requirement that must satisfy broadcast standard of harassing of adjacent channel, especially must be less than-60dB to harassing of voice signal, and can not trigger frequency multiplier circuit in the stereodecoder.Effective spectrum is meant and recovers the requisite frequency component of data-signal with certain antijamming capability that the frequency band of effective spectrum is called effective band.
The present invention adopts a kind of centrifugal pump with symbol width to transmit the sign indicating number type of digital information, is referred to as the sign indicating number that broadens.Broaden the sign indicating number waveform be a kind of pulse signal of bipolarity non-return-to-zero, its each pulse unit is a code element, the difference of pulse duration is represented different information, other geometric parameters such as the polarity of pulse, amplitude, pulse edge do not carry information.The symbol width of sign indicating number of broadening can have two kinds or two or more centrifugal pumps, forms binary or the polynary sign indicating number that broadens.The present invention is divided into two classes to the code element of the sign indicating number that broadens, and wherein a sign indicating number the shortest wide a kind of code element is called the S sign indicating number, goes here and there to be called for the sign indicating number of S sign indicating number continuously to connect " S " sign indicating number string, the code-element period of the value representation S sign indicating number of TS; The code element that broadens of all the other kinds is referred to as the L sign indicating number, and the sign indicating number string for the L sign indicating number is called even " L " sign indicating number string, the code-element period of the L sign indicating number that the value representation pulsewidth of TL is the longest continuously.The L sign indicating number has more than a kind of code-element period in the polynary sign indicating number that broadens.Broaden the sign indicating number code-element period different in size, here the inverse of the code-element period of S sign indicating number call broaden the sign indicating number chip rate, its value B=1/TS; The ratio of the wideest L sign indicating number and the code-element period of S sign indicating number (TL: TS) call the peak pulse duration of the sign indicating number that broadens.Chip rate (B) and peak pulse duration (TL: TS) be the hard parameter that influences yard effective band that broadens.
The characteristics of yard frequency spectrum of broadening are: its effective band is distributed in the both sides at 0.5B place; When the company in the data flow " S " sign indicating number string was elongated, its effective spectrum was drawn close to the 0.5B place; When the company in the data flow " L " sign indicating number string was elongated, its effective spectrum scattered to both sides; The broaden peak pulse duration of sign indicating number also can change its effective band.
Can draw thus: one. the length control of company " L " the sign indicating number string of the sign indicating number that broadens within the specific limits, make it be not more than L-max (L-max is called as the maximum joined mark number of L sign indicating number), can be controlled at its effective spectrum within certain frequency band range so, and the value that reduces L-max can make its effective band narrow down.Two. the length control of company " S " the sign indicating number string of the sign indicating number that broadens within the specific limits, make it be not less than S-min (S-min is called as the minimum joined mark number of S sign indicating number), the value that improves S-min so also can make the effective band of the sign indicating number that broadens narrow down.Therefore, L-max and S-min are the software parameter numbers that influences yard effective band that broadens.
Coding principle when broadening yard transmitting digital information is: the bit string of being made up of cell of the same race (information unit) with each section is one " group ", before every " group " information, transmit a cell type symbol earlier, be used for defining the cell type of " group " information of being somebody's turn to do, and then transmit the information of the length of expression this " group ".The type of cell symbol is a kind of with the beginning of L sign indicating number, by several L sign indicating numbers, the special code string that cooperates suitable S sign indicating number to form in case of necessity.In the back of type symbol, each S sign indicating number represent one to accord with defined cell by this type, till the appearance of next type symbol.
The decoding principle of sign indicating number of broadening is, by the identification to cell type symbol in the data flow, determines the type of the cell that is about to send to, then subsequently each S sign indicating number converted to a determined cell, till next type symbol occurs.
When broadening the information flow that sign indicating number transmission is made up of N kind cell with binary, if represent the cell type with connecting length that " L " sign indicating number goes here and there simply, the L-max=N that broadens yard of binary so; If the different spread patterns with L sign indicating number and S sign indicating number are represented the cell type, perhaps cooperate suitable host-host protocol, may make L-max＜N.Therefore, N unit digital information converts binary to and broadens behind the sign indicating number, L-max≤N, thus reach the purpose of control data signal effective band.
The different expression waies of type symbol constitute the different coding mode of the sign indicating number that broadens.The purpose of selecting the different coding mode is to change sign indicating number type software parameter to count L-max and S-min, thus the effective band of the sign indicating number that broadens.
When broadening the binary digit information that sign indicating number transmission is made up of " 0 " " 1 " character, two kinds of basic coding modes of A, B (being S-min=1) are arranged with binary:
A basic coding mode: make L-max=2, the sign indicating number that at this moment broadens has company " L " the sign indicating number string of two kinds of different lengths, and they just in time can be respectively accord with as the type of " 0 " and " 1 " character.
For example, with single L representation character types " 0 ", with continuous two L representation character types " 1 ".At this moment the cataloged procedure of A mode is: when occurring connecting " 0 " character string when (comprising single " 0 " character) in the data flow, encoder is L sign indicating number of output earlier, then this each character " 0 " that connects in " 0 " character string is converted to a S sign indicating number; When occurring connecting " 1 " character string when (comprising single " 1 " character) in the data flow, encoder is two L sign indicating numbers of output earlier, then this each character " 1 " that connects in " 1 " character string are converted to a S sign indicating number; The decode procedure of A mode is: when single L sign indicating number occurring in the code data stream that broadens, each S sign indicating number of this L sign indicating number back is converted to " a 0 " character, till next L sign indicating number occurs; When continuous two L sign indicating number occurring in the code data stream that broadens, each S sign indicating number of these two L sign indicating number back is converted to " a 1 " character, till next L sign indicating number occurs;
Certainly, also can be with single L representation character types " 1 ", with continuous two L representation character types " 0 ".
B basic coding mode:, can make L-max=1 in order to compress the effective band of the sign indicating number that broadens.At this moment the sign indicating number that broadens has only a kind of company " L " sign indicating number string form (being single L sign indicating number).The particular type of cell can't be represented with this a kind of company " L " sign indicating number string, but the phenomenon of " variation has taken place the cell type " can be represented.For example, when a L sign indicating number occurred, if what transmit before this is character " 0 ", what transmit after so from then on was character " 1 "; If what transmit before this is character " 1 ", what then from then on transmit afterwards is character " 0 ".So, as long as can correctly define the initial condition of receiving terminal decoder, in other words, in time adjust the operating state of (setting) decoder, make the state consistency of it and transmitting terminal encoder, decoder can correctly restore binary digit information so, otherwise " 0 " " 1 " paradox can appear in the binary digit information that translates.This " 0 " " 1 " paradox is called the polarity reversal of binary digit information.It is synchronous that the setting state of decoder is called the polarity of binary digit information.
The binary of the L-max=1 sign indicating number that broadens can't define the state of decoder.The present invention further makes binary digit information carry the polarity information of self, so just can find and correct the polarity reversal phenomenon in the receiving terminal decode procedure.
The polarity synchronization principles of binary digit information is: set a kind of " polarity accords with synchronously ".As being that company " 1 " character string of k accords with synchronously as polarity with length, i.e. character string " 011 ... 110 " (the wherein k such as number of " 1 ").The character string forms of polarity when synchronously symbol is reversed so, i.e. character string " 100 ... 001 " (the wherein k such as number of " 0 ") is called " the inverted image symbol synchronously " of polarity.Binary digit information is carried out:
1) " adding 1 " handles: when company " 1 " character string that occurs in the data flow that length is greater than or equal to k, connect an interpolation character " 1 " in " 1 " character string toward this.In this processed data stream, do not exist polarity to accord with synchronously.
2) " adding 0 " handles: when company " 0 " character string that occurs in the data flow that length is greater than or equal to k, connect an interpolation character " 0 " in " 0 " character string toward this.In this processed data stream, there is not synchronous inverted image symbol.
3) " add synchronously " processing: through in " adding 1 " and " adding 0 " processed data stream, every suitable distance, in other words data are divided into " piece ", the polarity of inserting suitable number between piece and the piece accords with synchronously.
In the binary digit information flow after these three step process,, mean that polarity is reversed in case synchronous inverted image symbol occurs.After in this case " 0 " in the data, " 1 " being inverted, be correct binary digit information.
Data broadcasting should adopt the transmission means of " packet ".At this moment the decollator of packet can be used as polarity and accords with synchronously, and the character style after decollator is reversed is synchronous inverted image symbol.Therefore increase " adding 0 " processing procedure in original packing data process, separating in original data increases character polarity synchronously and " subtracting 0 " processing procedure in the packet procedures, just can use the binary of the L-max=1 sign indicating number transmission binary digit information that broadens.
The head of data block and afterbody should add one " packet header symbol " and " bag tail symbol " respectively, and to avoid the combination of decollator and the data that transmitted, generation accords with similar (puppet) character string with decollator and synchronous inverted image.Packet header symbol and bag tail symbol can have multiple composition form, for example, make first character of packet header symbol and be " 1 " with last character that wraps the tail symbol, other character can be used to the additional informations such as length, attribute and error-detection error-correction of Data transmission bag, and " the parallel tunnel " of multichannel is provided for client layer.Bag tail symbol also plays register in cleaning encoder and the decoder.Data block should be carried out " adding 1 " and " adding 0 " processing together with its packet header symbol and bag tail symbol, and then accords with synchronously with polarity and to be connected.
The cataloged procedure of B mode is: data to be sent are divided into data block.Set up a packet header symbol and a bag tail symbol in the front-end and back-end of each data block respectively, carry out " adding 1 " and " adding 0 " then and handle, form packet.Insert an amount of decollator between packet and the packet, reconnect.All convert each character in this data flow (no matter it is " 0 " or " 1 ") to a S sign indicating number again, and become " 1 " by " 0 ", perhaps become the place of " 0 ", insert a L sign indicating number by " 1 " at character.
Fig. 5 represents principle and the process that decoding, the polarity of B mode is synchronous and unpack: the initial condition of the character register in the decoder (" 0 " or " 1 ") can be provided with arbitrarily.When the code data stream that broadens was sent into decoder, if input is a S sign indicating number, decoder was exported the character in the character register so; If input is a L sign indicating number, the character polarity in the character register is reversed once, and at this moment decoder is not exported any character.The data flow of decoder output is by the polarity adjuster.This polarity adjuster also has a State Control input, and its state control signal is from the output of status register.The initial condition of status register output can be provided with arbitrarily.When state control signal was " 0 ", data flow still kept original polarity after by the polarity adjuster; When state control signal is " 1 ", data flow by the polarity adjuster after character polarity be reversed.The data of polarity adjuster output are temporarily left in the data buffer, also send into a sync discriminator of being made up of ' k+2 ' bit shift register simultaneously.When the synchronous inverted image of appearance in the sync discriminator accorded with, its output was put upside down once the state in the status register, and the data of keeping in the forgo data buffer, made the stacking pointer of data buffer retract starting point.When occurring decollator (just polarity accords with synchronously) in the sync discriminator, must carry out single treatment to the data in the data buffer.If at this moment the data in the buffer are greater than certain value, the data in the buffer are exactly an active data bag so, can send into de-packetizer to it and unpack processing; Otherwise the data in the buffer are invalid, are abandoned.No matter whether the data of buffer are effective, and each stacking pointer of handling back data buffer all should be retracted starting point.Data are carried out " subtracting 1 " and " subtracting 0 " and are handled in de-packetizer." subtract 1 " and handle and be, when company " 1 " character string that occurs in the data flow greater than k, from this character string, leave out a character " 1 ".The processing procedure that " subtracts 0 " is when company " 0 " character string that occurs in the data flow greater than k, leaves out a character " 0 " from this character string.Removing the packet header symbol and the bag tail symbol of packet then, is the data block that is transmitted.The data block that restores is linked up, just obtain the binary digit information that is transmitted.In order to finish above-mentioned character polarity error correction synchronizing process, to insert an amount of decollator between the packet.
Miller code is made up of the code element of three kinds of different in width, and the wide ratio of sign indicating number between them is 2: 3: 4, is called M2 sign indicating number, M3 sign indicating number and M4 sign indicating number.Two kinds of basic coding modes (S-min=1) when broadening sign indicating number transmission Miller code information with binary are:
C basic coding mode: make and work as L-max=3, the sign indicating number that at this moment broadens has company " L " the sign indicating number string of three kinds of different lengths, they can be respectively as the type symbol of three kinds of code elements of Miller code.
For example, the utilization rate of M2 code element is the highest, with single L sign indicating number as the type of M2 sign indicating number symbol, with company " L " the sign indicating number string of length etc. 2 type symbol, with company " L " the sign indicating number string of length etc. 3 type symbol as the M4 sign indicating number as the M3 sign indicating number.At this moment the cataloged procedure of C mode is: when occurring connecting " M2 " sign indicating number string (comprising single M2 sign indicating number) in the Miller code data flow, encoder is L sign indicating number of output earlier, and each the M2 code element that this is connected in " M2 " sign indicating number string converts a S sign indicating number to then; When appearance connects " M3 " sign indicating number string (comprising single M3 sign indicating number) in the Miller code data flow, two L sign indicating numbers of the continuous earlier output of encoder, each the M3 code element that this is connected in " M3 " sign indicating number string converts a S sign indicating number to then; When appearance connects " M4 " sign indicating number string (comprising single M4 sign indicating number) in the Miller code stream, three L sign indicating numbers of the continuous earlier output of encoder, each the M4 code element that this is connected in " M4 " sign indicating number string converts a S sign indicating number to then.At this moment the decode procedure of C mode is: when single L sign indicating number occurring in the code data stream of broadening, convert each S sign indicating number of its back to a M2 sign indicating number, till next L sign indicating number occurs; When continuous two L sign indicating number occurring in the code data stream of broadening, convert each S sign indicating number of its back to a M3 sign indicating number, till next L sign indicating number occurs; When continuous three L sign indicating number occurring in the code data stream of broadening, convert each S sign indicating number of its back to a M4 sign indicating number, till next L sign indicating number occurs.
D basic coding mode:, can make L-max=2 in order to compress the effective band of the sign indicating number that broadens.At this moment cooperate suitable S sign indicating number with the L sign indicating number below two or two, can form three kinds of multi-form sign indicating number strings, as the type symbol of three kinds of Miller code code elements.
For example, add the type symbol of a S sign indicating number (being expressed as " L+S " sign indicating number string) with a L sign indicating number back as the M2 sign indicating number; With the type symbol of continuous two L sign indicating numbers (being expressed as " L+L " sign indicating number string) as the M3 sign indicating number; Add a S sign indicating number and then add the type symbol of a L sign indicating number (being expressed as " L+S+L " sign indicating number string) with a L sign indicating number back as the M4 sign indicating number.At this moment the cataloged procedure of D mode is: when occurring connecting " M2 " sign indicating number string (comprising single M2 sign indicating number) in the Miller code data flow, " L+T " sign indicating number of encoder output earlier string converts this each M2 code element that connects in " M2 " sign indicating number string to a S sign indicating number then; When occurring connecting " M3 " sign indicating number string (comprising single M3 sign indicating number) in the Miller code data flow, " L+L " sign indicating number of encoder output earlier string converts this each M3 sign indicating number that connects in " M3 " sign indicating number string to a S sign indicating number then; When occurring connecting " M4 " sign indicating number string (comprising single M4 sign indicating number) in the Miller code data flow, " L+S+L " sign indicating number of decoder output earlier string converts this each M4 code element that connects in " M4 " sign indicating number string to a S sign indicating number then.At this moment the decode procedure of D mode is: when " L+S+S " sign indicating number that occurs in the code data stream that broadens was gone here and there, decoder is M2 code element of output earlier, converts each S sign indicating number subsequently to a M2 sign indicating number then, till next L sign indicating number occurs; When occurring " L+L " sign indicating number string in the code data stream of broadening, convert subsequently each S sign indicating number to a M3 sign indicating number, till next L sign indicating number occurs; When occurring " L+S+L " sign indicating number string in the code data stream of broadening, convert subsequently each S sign indicating number to a M4 sign indicating number, till next L sign indicating number occurs.
Because added the type symbol in the cataloged procedure, institute's data quantity transmitted is extended.On the other hand, in the process of transmission Miller code information, when the code-element period of M2 sign indicating number equals TS, during the TS=2 Δ, the cycle is the concrete transmission time of the M4 sign indicating number that the M3 sign indicating number of 3 Δs and cycle is 4 Δs only to have used 2 Δs.That is to say that the data volume of Miller code has been compressed behind the sign indicating number coding that broadens, the instantaneous maximum of this compression ratio can reach 2: 1.After comprehensively enlarging and compressing two effects, the code efficiency η of the sign indicating number that broadens (ratio of the data volume behind the data volume before η equals to encode and the coding) is relevant with the structure of parameter, coded system and the data flow of the sign indicating number that broadens, and is a dynamic value.If the coding/decoding process of the sign indicating number that broadens is used as one of the part of " transmission ", the transmission rate of " user " data equals B * η so, also is a dynamic value.(TL: when TS) waiting 2, the code efficiency of B basic coding mode is 0.333＜η＜1, and assembly average waits 0.74 approximately, and at this moment the effective band of digital signal is the narrowest when the peak pulse duration of the sign indicating number that broadens; The code efficiency of D basic coding mode is 0.283＜η＜2, and assembly average waits 1.24 approximately, and the data rate of the sign indicating number that at this moment broadens is the highest.
On yard basis of basic coding mode that broadens, make S-min＞1, can further compress the effective band of the sign indicating number that broadens or improve its antijamming capability.Code efficiency strengthens along with the S-min value and descends at this moment.Yard coding principle that broadens of S-min＞1 o'clock is, adds (S-min-1) individual S sign indicating number earlier in the back of each type symbol, then transmit cell.At this moment the decoding principle of sign indicating number of broadening is, skips (S-min-1) individual S sign indicating number in each type symbol back, just subsequently S sign indicating number converted to this type then and accords with defined cell, till next L sign indicating number occurs.
When the original waveform of sign indicating number of broadening adopts the constant amplitude rectangular pulse, comprise abundant low frequency, high-frequency harmonic composition in the coded signal that broadens.Further, make the area of pulse unit keep equating (luffing square wave) by changing the amplitude of pulse; The rising edge that perhaps further makes pulse is that one section negative 90 sine curve, trailing edges of spending positive 90 degree are one section positive 90 sine curves of spending negative 90 degree, the outer harmonic wave of band of the coded signal that all can reduce to a certain extent to broaden.The digital signal of being made up of these several simple original waveform all must be by very filtering strictly, could guarantee it to the harassing less than-60dB of voice signal, and assurance can not trigger pair carrier restoring circuit in the stereodecoder.Such filter effect realizes that with hardware circuit certain technical difficulty is arranged, and adopts common digital filtering way then to need the computer of a considerable scale, because the speed ratio of frequency modulation L-R data broadcasting is higher.
The wave-form synthesizer that adopts among the present invention is a kind of " code/pulse unit " transducer, and it determines the shape of output pulse unit according to the code form of input traffic.The shape of these pulse units is one group of waveform module of passing through optimization process in advance.The purpose of this optimization process is that the spectrum distribution of the signal that is spliced by these waveform module is met specific requirement.
Fig. 6 is the theory diagram that waveform is synthetic: the code element window is the broaden shift register of yard code element of a suitable length (preferably odd number).Obtain in advance in the code element window the sign indicating number string form of the sign indicating number that broadens that might occur, be referred to as code string, they are left in " code " district in " module library ".And in advance these code strings are one by one replaced with certain original waveform, obtain them then through the ideal waveform after the ideal filter.So each code string is to there being one section ideal waveform, that pulse unit that is positioned at this section ideal waveform center is a waveform module, and it is exactly the mark that is positioned at that code element at this code string center.The quantized value of each waveform module is left in " module " district of " module library " lining as an array.By this " module library " " code " connected one to one with " module " corresponding with it.In advance optimization process that Here it is.When data sent, the data flow displacement that makes the sign indicating number that broadens was by this code element window.Every displacement once, the sign indicating number string that occurs in the code element window is taken out as the retrieval foundation, in the code area of module library, find corresponding code string, find a corresponding waveform module, again this waveform module (one group of numerical value) is sent into D/A (D/A) transducer by this code string.Under the driving of sampling clock, and, this group numerical value is converted to a pulse unit waveform by D/A converter according to the principle that positive and negative alternating polarity occurs.After a mark waveform generated, data flow was moved one in the code element window, then began synthetic next mark waveform.This waveform building-up process cooperates D/A converter spare to finish by computer.
The advantage of this waveform synthetic method is to replace a large amount of addition, multiplication " numerical computations " process with " data retrieval ", thereby has reduced the requirement to computer speed significantly.Employing broadens and can reduce the scale of " module library " behind the sign indicating number largely, makes this waveform synthetic method have the enforcement may.The numerical precision of the harmonic wave of wave-form synthesizer (stopband) when attenuation depends on quantification treatment mainly is that the position of D/A converter spare is long.Its filtering squareness factor depends on the code element window width.
The frequency of the sampling clock of wave-form synthesizer should equal the to broaden product of yard chip rate B and sampling resolution, the sampling resolution depends on the precision of the peak pulse duration of the sign indicating number that broadens, just TL again: the denominator of TS expression formula.For example, as TL: TS=2: in the time of 1, minimum sampling resolution equals 1; As TL: TS=1.5=3: in the time of 2, minimum sampling resolution just should wait 2; Further make TL: TS=1.49=149: 100 o'clock, so minimum sampling resolution must bring up to 100, so just can embody symbol width and be the difference between 1.50 or 1.49.The raising of sampling resolution means that needs improve the CPU speed of wave-form synthesizer computer and the scale of internal memory RAM.Therefore, the selection of yard peak pulse duration that broadens not only influences code efficiency and signal spectrum, and is a principal element of decision wave-form synthesizer (computer) scale.
Digital signal is carried out it being carried out the discriminating of pulse duration, the just reducible sign indicating number that goes out to broaden after amplitude limit amplifies.Pulsewidth discriminator needs a standard time-base signal, and the frequency of this time-base signal should exceed suitable multiple than transmitting terminal wave-form synthesizer sample frequency, but and need not any Synchronous Processing between the transmitting terminal.Broaden the sign indicating number reception and reduction process finish by hardware circuit, the data flow after the reduction is sent into computer by serial or parallel interface.The decoding of data, and the bit synchronization in the decode procedure, the group synchronizing process finish by software.
Polynary broadening during yard transmitting digital information can make L-max=1, accords with as the cell type with the L sign indicating number of different in width.The formation way of the L sign indicating number of the polynary sign indicating number that broadens has:
One. keep peak pulse duration constant, the difference of TL and TS is divided into some kinds of centrifugal pumps, form the L sign indicating number of different in width.For example, making the broaden wide ratio of four kinds of code element sign indicating numbers of sign indicating number of quaternary is 3: 4: 5: 6, and TS=3 Δ at this moment, the width of three kinds of L sign indicating numbers is respectively 4 Δs, 5 Δs, 6 Δs, and peak pulse duration still waits 2.This method has increased the precision of peak pulse duration, so computer speed and internal memory scale requirement raising thereupon.
Two. keep the wide difference of sign indicating number between the different code elements constant, generate multiple L sign indicating number.For example, making the broaden wide ratio of four kinds of code element sign indicating numbers of sign indicating number of quaternary is 1: 2: 3: 4, and TS=Δ at this moment, three kinds of L sign indicating numbers are respectively 2 Δs, 3 Δs, 4 Δs.The sample frequency of the wave-form synthesizer of this way is constant, but the peak pulse duration increase of the sign indicating number that broadens makes effective band widen.
For example, in frequency modulation L-R channel, can use the binary of TS=13.158 μ S, TL: the TS=2 sign indicating number that broadens.If at this moment use the sign indicating number type (B coded system) of L-max=1, S-min=1, the about 56Kbps of the speed of user data (statistical value) so, the anti-interference 20dB that is better than of signal; If at this moment earlier data are become Miller code, and then with the sign indicating number type (D coded system) of L-max=2, S-min=2, the speed of user data (statistical value) can be greater than 80Kbps, the anti-interference 23dB that is better than of signal.
Some f-m broadcast station transmits data in the RDS channel of 57 ± 2KHz in the broadcast baseband signal.If the frequency band of frequency modulation L-R data broadcasting is expanded to 23 ∽ 59KHz, can use the binary of TS=12.195 μ S, TL: the TS=2 sign indicating number that broadens so, (D) coded system of L-max=2, S-min=1, the speed of user data (statistical value) can reach 100Kbps.Frequency modulation L-R data broadcasting has taken the data transmission capabilities that the data transmission capabilities that is increased after the RDS channel surpasses RDS out and away, and the antijamming capability of digital signal can obviously improve.When broadcasting stereophonic program, the still available RDS mode of f-m broadcast station transmits the stronger data message of some timeliness.Therefore, match, can make FM broadcasting possess two kinds of broadcast modes of " stereo+the DRS data "/" monophony+(L-R) data ", further improve the data broadcasting speed in the FM broadcasting, and data broadcasting is not interrupted because of stereophonic program with the RDS technology.
59KHz does not still have the formation standard so far with the application of super band (the auxiliary communication channel of title claims the SCA channel again) in the FM broadcasting baseband signal.In the SCA channel, carry out data broadcasting with broaden sign indicating number and Waveform Synthesis Technology, the parameter value that needs the frequency range dividing condition press the SCA channel, adjustment to broaden yard.For example adopt the binary of TL: the TS=2 sign indicating number that broadens: when channel is 61 ∽ 75KHz, adopt TS=7.353 μ S, S-min=8 (or=9, decide on anti-interference requirement), the B coded system; When channel is 61 ∽ 91KHz, adopt TS=6.579 μ S, S-min=4 (or=5), the B coded system; When channel is 61 ∽ 102KHz, adopt TS=6.135 μ S, at this moment can adopt the B coded system of S-min=3 or the D coded system of S-min=5.
Sign indicating number and the Waveform Synthesis Technology of broadening also can be applied to the frequency range that is constituted jointly by RDS and SCA, and in other data communication channels.
The last figure of Fig. 7 is the broaden signal wave of sign indicating number of the binary of segment encode unit window width etc. 15, L-max=1, S-min=1, peak pulse duration etc. 2, and figure below is the spectrogram of sign indicating number of broadening.
Claims (43)
1. device that utilizes the L-R channel radio data in the FM broadcasting emission system, described frequency modulation L-R channel comprises the subtracter that is used for receiving inputted signal, a DSB-SC modulator, a band pass filter and a superimposer, described device is characterised in that described device also comprises:
A data sending part branch is used to provide and wants data signals transmitted;
First change over switch (KS1) is arranged between described DSB-SC modulator, data transmission part and the band pass filter, is used for selectively receiving data-signal or audio signal;
Second change over switch (KS2) is arranged between described frequency divider and the narrow band filter, is used for selectively being switched on or switched off pilot signal;
A pattern control end, (KS1, KS2) links to each other with first, second switch, is used for the state of control switch, and described pattern control end also sends with data and links to each other, and is used for the control data sending part and divides the transmission data-signal.
2. device according to claim 1, also comprise a comparator, its input links to each other with left and right two sound channels respectively, is used for the similarities and differences of more left and right two sound channel channels, its output links to each other with the pattern control end, is used for the operation that automatic control switch (KS1, KS2) and data send part.
3. device as claimed in claim 1, wherein said pattern control end also can by manual control control described first and second switches (KS1, KS2) and data send the work of part.
4. device as claimed in claim 1, wherein said data send part and also comprise data encoder, be used for the data of input are encoded, and the data after will encoding provide data sending terminal.
5. device as claimed in claim 1, wherein said data-signal end (DT) can directly send data-signal end partly with the previous stage data and link to each other when carrying out the relay of data.
6. device as claimed in claim 5 wherein is provided with a data processor between the data-signal end of the data-signal end of receiving equipment and transmitting apparatus, be used to revise the content of data flow.
7. device as claimed in claim 4, wherein said data encoder uses a kind of sign indicating number that broadens, the effective spectrum of data-signal is all concentrated in the frequency range of 23～53KHz, the described feature that broadens sign indicating number is to transmit digital information with the centrifugal pump of symbol width, the described sign indicating number that broadens is a kind of pulse signal of bipolarity non-return-to-zero, its each pulse unit is a code element, and the different in width of pulse is represented different information.
8. device as claimed in claim 4, wherein said data send part and also comprise data combiner, are used for that the coded data of data encoder output is carried out waveform and synthesize, so that data-signal satisfies the requirement of broadcast standard to harassing of adjacent channel.
9. device as claimed in claim 8, wherein said wave-form synthesizer are a kind of " code/pulse unit " transducers, are used for determining according to the code form of input traffic the shape of output pulse unit.
10. device as claimed in claim 9, the shape of wherein said pulse unit is to pass through optimization process in advance.
11. a device that receives the broadcast data of the L-R channel in the frequency modulation broadcast system, described device comprises a receiving terminal, and a stereodecoder and an output is characterized in that described device also comprises:
A data receiving unit is used to receive the data-signal (DT) that is sent;
A band pass filter, its input links to each other with described receiving terminal, is used for isolating data-signal (DT) from the broadcast baseband signal;
A pilot tone identifier, its input also links to each other with described receiving terminal, is used to discern pilot signal, and in its output output mode control signal (mode);
One the 3rd change over switch (KR) is arranged between described band pass filter and the described data reception portion branch, and links to each other with the output of described pilot tone identifier;
Wherein, the mode control signal of described pilot tone identifier output is selectively sent data-signal (DT) into the Data Receiving part by the 3rd change over switch (KR), so that be reduced into the data flow that is transmitted.
12. device as claimed in claim 11, wherein said data reception portion branch comprises a limiting amplifier, a pulsewidth discriminator and a data decoder, is used for being decoded into data flow through yard encoded data signals that broadens with what receive after amplitude limit amplification and pulse discriminating.
13. device as claimed in claim 11, wherein when relaying, the data-signal that is received (DT) directly links to each other with the data-signal end of next stage Data Receiving part.
14. device as claimed in claim 13 wherein is provided with a data processor between the data-signal of receiving equipment and transmitting apparatus, be used to revise the content of data-signal.
15. a method of utilizing the L-R channel radio data in the FM broadcasting emission system said method comprising the steps of:
A) mode control signal (mode) of pattern control end in the radiating portion is set;
B) when carrying out stereophonic broadcasting, the mode control signal of described transmitting terminal (mode) makes data send part and quits work, and makes the stereophonic encoder operate as normal, to obtain the baseband signal of FM broadcasting;
C) when carrying out frequency modulation L-R data broadcasting, the mode control signal of described transmitting terminal (mode) starts described data and sends part; The output (DSB-SC) of described first change over switch (KS1) with the DSB-SC modulator disconnected, be connected and send part with described data, to transmit data, described second change over switch (KS2) is gone to be connected with the output of described frequency divider, to cut off pilot signal;
16. method as claimed in claim 15 is to come automatic control mode control signal (mode) by the similarities and differences of comparator more left and right (L, R) two-way audio input signal in the wherein said step a).
17. method as claimed in claim 15, in the wherein said step a) by manual control model control signal (mode).
18. method as claimed in claim 15, wherein said step c) also comprises:
D) data flow of input is encoded.
19. the described method of claim 15, also be included in when carrying out data retransmission, described data-signal (DT) directly is sent to the step of the data-signal end that another grade data sending part divides, and selectively between the data-signal end of receiving equipment and transmitting apparatus with the step of the content of set data processor modification data-signal.
20. method as claimed in claim 18, wherein said coding step d) also comprises the step of using a kind of sign indicating number that broadens that data stream is encoded, the described feature that broadens sign indicating number is to transmit digital information with the centrifugal pump of symbol width, the described sign indicating number that broadens is a kind of bipolarity nonreturn-to-zero pulse signal, its each pulse is a code element, the different in width of pulse is represented different information, and other geometric parameters such as the polarity of pulse, amplitude, pulse edge do not carry information.
21. method as claimed in claim 20, the wherein said pulsewidth that broadens sign indicating number can have two or more centrifugal pump, forms binary or the polynary sign indicating number that broadens.
22. method as claimed in claim 21, wherein the step d) of encoding with the described sign indicating number that broadens comprises:
1) the shortest class code element of pulsewidth being set is the S sign indicating number, and continuous S sign indicating number is called and connects " S " sign indicating number string;
2) sign indicating number that broadens of establishing all the other kinds all be the L sign indicating number, and continuous L sign indicating number is called and connects " L " sign indicating number and go here and there;
3) the bit string marshalling of forming by cell of the same race with each section, before every group, transmit a cell type symbol earlier, transmit the length information of this group then, described code element type symbol is with the beginning of L sign indicating number, by several L code elements, the special code string that cooperates suitable S code element to form in case of necessity, each S code element represents one to accord with defined cell by this (by its place ahead) type, till next type symbol occurs.
23. method as claimed in claim 22 wherein comprises with the broaden coding step of the binary digit information that sign indicating number transmission is made up of " 0 ", " 1 " character of binary:
1) sign indicating number that will broaden is arranged to company " L " the sign indicating number string of two kinds of different lengths, and the type as " 0 " and " 1 " character accords with respectively;
2) when a kind of character in appearance " 0 " or " 1 " character in the data flow, encoder is company " L " sign indicating number of a kind of length of output earlier;
3) when continuous identical characters occurring behind this character, encoder becomes one " S " sign indicating number with each character conversion in the character string;
Encoder is then exported company " L " sign indicating number of described another kind of length when 4) kinds of characters occurring after occurring character inequality or continuous identical characters behind this character;
5) repeat the 3rd)-4) step, thus the coded data of drawing.
24. method as claimed in claim 22 wherein comprises with the broaden coding step of the binary digit information that sign indicating number transmission is made up of " 0 ", " 1 " character of binary:
A kind of company " L " sign indicating number of length is set, is used to represent that the cell type changes.
25. the method described in claim 24, wherein said coding step also comprise binary digit information is carried out the synchronous step of polarity, so that find and correct the phenomenon of polarity reversal in decode procedure, described polarity synchronizing step comprises:
1) a kind of " polarity accords with synchronously " and a kind of " inverted image symbol synchronously " is set;
2) binary digit information is carried out " adding 1 " and handle, so that do not exist this polarity to accord with synchronously in the processed data stream;
3) binary digit information is carried out " adding 0 " and handle, so that do not have this synchronous inverted image symbol in the processed data stream,
4) handle carry out " adding synchronously " through " adding 1 " and " adding 0 " processed data stream, described data flow is divided into " piece ", the polarity of inserting suitable number between piece and piece accords with synchronously.
26. the method described in claim 24, wherein when adopting " packet " transmission data block, the decollator of available described packet accords with synchronously as polarity, and the character style after putting upside down with described decollator is as synchronous inverted image symbol.
27. the method described in claim 22 wherein comprising with the broaden coding step of sign indicating number transmission Miller code information (M2, M3, M4) of binary:
1) sign indicating number that will broaden is arranged to have company " L " the sign indicating number string of three kinds of different lengths, respectively as the type symbol of three kinds of code elements of Miller code (M2, M3, M4);
When 2) this first kind of code element (M2) string occurred when the Miller code data flow, encoder was exported the L sign indicating number of first kind of length, and converts each identical code element in this yard string to a S sign indicating number;
3) when occurring second kind of code element (M3) string in the Miller code data flow, encoder is then exported the L sign indicating number of second kind of length, and converts each identical code element in this joined mark string to a S code element;
4) when occurring the third code element (M4) string in the Miller code data flow, encoder is then exported the L sign indicating number of the third length, and converts each identical code element in this joined mark string to a S code element;
5) repeat above-mentioned 2)-4) then can draw described encoded data stream.
28. method as claimed in claim 22 wherein comprising with the broaden coding step of sign indicating number transmission Miller code information (M2, M3, M4) of binary:
The sign indicating number that broadens is arranged to cooperate suitable S sign indicating number by the L sign indicating number below two kinds or two kinds, forms three kinds of different code-element strings and accord with as the type of three kinds of Miller code code elements respectively, thereby draw the coded data of Miller code.
29. according to claim 27 or 28 described methods, the described sign indicating number string in the wherein said coding step also can be single code element.
30. method as claimed in claim 29 wherein comprises with the polynary coding method that broadens yard transmission of digital signals: the maximum number that makes the L sign indicating number is 1, uses the L code element of different in width to accord with as the cell type.
31. method as claimed in claim 30, the wherein said polynary sign indicating number that broadens can be divided into some kinds of centrifugal pumps to the difference (TL-TS) of the code-element period of described L sign indicating number and S sign indicating number and form by keeping peak pulse duration constant.
32. method as claimed in claim 30 wherein saidly polynaryly broadens that sign indicating number can wide difference be constant forms by keeping sign indicating number between the different code elements.
33. the method described in claim 18 also comprises:
E) data-signal behind the described coding is carried out the synthetic step of waveform, wherein said wave-form synthesizer is determined the waveform of output pulse unit according to the code form of input traffic.
34. method as claimed in claim 33, the shape of wherein said pulse unit is the waveform module of one group of optimization process in advance.
35. a method that receives the data of L-R channel in the frequency modulation broadcast system said method comprising the steps of:
A) at receiving terminal a band pass filter is set, receives the broadcast baseband signal (containing data-signal) that is sent;
B) at receiving terminal a pilot tone identifier is set, is used for discerning pilot signal from baseband signal;
C) between described band pass filter and data reception portion branch one the 3rd change over switch (KR) is set, described the 3rd change over switch (KR) links to each other with the output of described pilot tone identifier;
D) when described pilot tone identifier identifies pilot signal from the broadcast baseband signal, the mode control signal of described output (mode) disconnects described the 3rd switch (KR) and band pass filter, stop the reception of data-signal, and make the stereodecoder operate as normal, thereby obtain stereo broadcasting signal;
E) when the pilot tone identifier does not identify pilot signal from input signal, the mode control signal of its output just makes described the 3rd switch (KR) and band pass filter connect, thereby realizes the reception of data-signal.
36. method as claimed in claim 35, wherein said receiving step e) also comprise:
F) waveform that receives is broadened the code data signal after amplitude limit amplifies after synthetic, carry out pulse duration and differentiate, to restore the pulsewidth sign indicating number;
G) pulsewidth sign indicating number encoded data signals is decoded.
37. method as claimed in claim 35, also be included in when carrying out data retransmission, the data-signal (DT) that is received directly is sent to the step of the data-signal end of next stage Data Receiving part, and selectively between the data-signal end of receiving equipment and transmitting apparatus with the step of the content of set data processor modification data-signal.
38. method as claimed in claim 36, wherein said decoding step (g) comprising:
H) cell type symbol in yard coded data stream that broadens is discerned, with the type of the definite cell that will deliver to;
I) convert each S sign indicating number subsequently to a determined cell, till next type symbol occurs.
39. method as claimed in claim 38, wherein said decoding step g) comprise that also described decoded data will be carried out " subtracting 1 " and " subtracting 0 " and be handled when data are the form transmission of employing " packet ".
40. system that carries out frequency modulation L-R data broadcasting, described broadcast system comprises a radiating portion and a receiving unit, described radiating portion comprises: the input with left and right two sound channels (L, R), a stereophonic encoder, with an output, described receiving unit comprises a receiving terminal, a stereodecoder and an output; Described system is characterised in that:
Also comprise in the transmission part:
A data sending part branch is used to provide and wants data signals transmitted;
First change over switch (KS1) is arranged between described DSB-SC modulator, data transmission part and the band pass filter, is used for selectively receiving data-signal or audio signal;
Second change over switch (KS2) is arranged between described frequency divider and the narrow band filter, is used for selectively being switched on or switched off pilot signal;
A pattern control end, (KS1, KS2) links to each other with described first, second switch, and (KS1, state KS2), described pattern control end also send with described data and link to each other, and are used for the control data sending part and divide the transmission data-signal to be used to control described switch;
Also comprise at receiving unit:
A data receiving unit is used to receive the data-signal (DT) that is sent;
A band pass filter, its input links to each other with described receiving terminal, is used for isolating data-signal (DT) from the broadcast baseband signal;
A pilot tone identifier, its input also links to each other with described receiving terminal, is used to discern pilot signal, and in its output output mode control signal (mode);
One the 3rd change over switch (KR) is arranged between described band pass filter and the described data reception portion branch, and links to each other with the output of pilot tone identifier;
Wherein, the mode control signal of described pilot tone identifier output is selectively sent data-signal (DT) into described data decoder by described the 3rd change over switch (KR), thereby is reduced into the data flow that is transmitted.
41. a processing method of carrying out the data-signal of frequency modulation L-R data broadcasting, described method comprises the following steps:
A) mode control signal (mode) of pattern control end in the described radiating portion is set;
B) when carrying out stereophonic broadcasting, the mode control signal of described transmitting terminal (mode) makes data send part and quits work, and makes the stereophonic encoder operate as normal, to obtain the baseband signal of FM broadcasting;
C) when carrying out frequency modulation L-R data broadcasting, the mode control signal of described transmitting terminal (mode) starts described data and sends part; The output (DSB-SC) of described first change over switch (KS1) with the DSB-SC modulator disconnected, be connected,, described second change over switch (KS2) is gone to be connected with the output of frequency divider, to cut off pilot signal to transmit data and send part with data;
D) at receiving terminal a band pass filter is set, receives the broadcast baseband signal (containing data-signal) that is sent;
E) a pilot tone identifier is set when receiving terminal, is used for discerning pilot signal from baseband signal;
F) between band pass filter and data reception portion branch one the 3rd change over switch (KR) is set, described the 3rd change over switch (KR) links to each other with the output of described pilot tone identifier;
G) when described pilot tone identifier identifies pilot signal from the broadcast baseband signal, the mode control signal of described output (mode) disconnects described the 3rd change over switch (KR) and band pass filter, stop the reception of data-signal, and make the stereodecoder operate as normal, thereby obtain stereo broadcasting signal;
H) when described pilot tone identifier does not identify pilot signal from described input signal, the mode control signal of its output just makes described the 3rd change over switch (KR) and described band pass filter connect, thereby realizes the reception of data-signal.
42. system as claimed in claim 40 also can be used for the transfer of data that frequency band expands the channel of 23-59KHz to.
43. method as claimed in claim 41 also can be used for the transfer of data that frequency band expands the channel of 23-59KHz to.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95118718 CN1148297A (en) | 1995-10-16 | 1995-10-16 | Frequency modulation L-R data broadcast system, and method for treating data signals therefor |
| EP96934323A EP0977388A1 (en) | 1995-10-16 | 1996-10-16 | A system of fm data broadcasting and a method of processing data signals thereof |
| CA 2234871 CA2234871A1 (en) | 1995-10-16 | 1996-10-16 | A system of fm data broadcasting and a method of processing data signals thereof |
| AU72766/96A AU715471B2 (en) | 1995-10-16 | 1996-10-16 | A system of FM data broadcasting and a method of processing data signals thereof |
| PCT/CN1996/000089 WO1997015128A1 (en) | 1995-10-16 | 1996-10-16 | A system of fm data broadcasting and a method of processing data signals thereof |
| JP9515388A JPH11513851A (en) | 1995-10-16 | 1996-10-16 | FM data broadcasting system and data signal processing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95118718 CN1148297A (en) | 1995-10-16 | 1995-10-16 | Frequency modulation L-R data broadcast system, and method for treating data signals therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1148297A true CN1148297A (en) | 1997-04-23 |
Family
ID=5081767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95118718 Pending CN1148297A (en) | 1995-10-16 | 1995-10-16 | Frequency modulation L-R data broadcast system, and method for treating data signals therefor |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0977388A1 (en) |
| JP (1) | JPH11513851A (en) |
| CN (1) | CN1148297A (en) |
| AU (1) | AU715471B2 (en) |
| WO (1) | WO1997015128A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010009659A1 (en) * | 2008-07-24 | 2010-01-28 | 华为技术有限公司 | Encoding/decoding method, apparatus and system |
| CN101055716B (en) * | 2006-04-13 | 2011-07-20 | 联发科技股份有限公司 | Stereo decoder and method for processing pilot signal |
| CN102223152A (en) * | 2010-04-13 | 2011-10-19 | 新港传播媒介公司 | Pilot based adaptation for FM radio receiver |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5038402A (en) * | 1988-12-06 | 1991-08-06 | General Instrument Corporation | Apparatus and method for providing digital audio in the FM broadcast band |
| KR920004817Y1 (en) * | 1990-08-14 | 1992-07-20 | 삼성전자 주식회사 | Common receiver device of audio mutilateral type |
| US5119503A (en) * | 1991-02-19 | 1992-06-02 | Mankovitz Roy J | Apparatus and methods for broadcasting auxiliary data in an FM stereo broadcast system |
-
1995
- 1995-10-16 CN CN 95118718 patent/CN1148297A/en active Pending
-
1996
- 1996-10-16 AU AU72766/96A patent/AU715471B2/en not_active Ceased
- 1996-10-16 JP JP9515388A patent/JPH11513851A/en active Pending
- 1996-10-16 EP EP96934323A patent/EP0977388A1/en not_active Withdrawn
- 1996-10-16 WO PCT/CN1996/000089 patent/WO1997015128A1/en not_active Application Discontinuation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101055716B (en) * | 2006-04-13 | 2011-07-20 | 联发科技股份有限公司 | Stereo decoder and method for processing pilot signal |
| US8045717B2 (en) | 2006-04-13 | 2011-10-25 | Media Tek Inc. | Stereo decoder and method for processing pilot signal |
| WO2010009659A1 (en) * | 2008-07-24 | 2010-01-28 | 华为技术有限公司 | Encoding/decoding method, apparatus and system |
| CN102223152A (en) * | 2010-04-13 | 2011-10-19 | 新港传播媒介公司 | Pilot based adaptation for FM radio receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| AU715471B2 (en) | 2000-02-03 |
| EP0977388A1 (en) | 2000-02-02 |
| JPH11513851A (en) | 1999-11-24 |
| WO1997015128A1 (en) | 1997-04-24 |
| AU7276696A (en) | 1997-05-07 |
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