CN1057936A - Capacity extended digital and analog mixed transmission method - Google Patents
Capacity extended digital and analog mixed transmission method Download PDFInfo
- Publication number
- CN1057936A CN1057936A CN 90103174 CN90103174A CN1057936A CN 1057936 A CN1057936 A CN 1057936A CN 90103174 CN90103174 CN 90103174 CN 90103174 A CN90103174 A CN 90103174A CN 1057936 A CN1057936 A CN 1057936A
- Authority
- CN
- China
- Prior art keywords
- digital
- analog
- capacity
- signal
- capacity extended
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Radio Relay Systems (AREA)
Abstract
The invention provides the capacity extended digital and analog mixed transmission method of a kind of suitable China PAL-D television system.The modulated subcarrier signal dilatation is to being no more than four on the base band of the original digital-analog combining transmission method of this method handle; therefore can increase the transport communication capacity biglyyer; also can increase duties monitoring, sound accompaniment and telephone path capacity simultaneously; enlarged range of application; the present invention simultaneously also has transmission signals quality height; perfect in shape and function, characteristics such as cost is low.But because in equipment extensive use satellite, microwave relay and the fiber optic communication channel of the present invention's development, so using value is extremely wide.
Description
The present invention relates to a kind of capacity extended digital and analog mixed transmission method that is used for communications, be specially adapted to reach the digital-analog combining transmission method that four roadbed bands are paid carrier wave.
China Patent No. 87103217.1 patents of invention disclose a kind of digital-analog combining transmission method; it is to pay carrier signal with the anolog TV signals of PAL-D standard with a way tone of Chinese characters system language to mix in the digital-to-analogue blender; separate anolog TV signals and digital modulation voice signal in digital separating unit channel transmission back; the TV signal of PAL-D standard is occupied 0-6 megahertz bandwidth like this; and this digital modulation language is paid carrier signal and can be taken the above bandwidth of 6 megahertzes; thereby a this individual digit modulation pair carrier wave is restricted message capacity; can't increase message capacity, and will increase some duties monitoring and also limited to.
The objective of the invention is to avoid above-mentioned the deficiencies in the prior art part and nearly four tunnel capacity extended digital and analog mixed transmission methods of paying carrier wave of a kind of base band are provided; both can increase the transport communication capacity; simultaneously also can increase duties monitoring, sound accompaniment and telephone path capacity, consummating function reduces cost.
The present invention realizes like this, voice signal or computer data, pilot signal and other data- signal 31,32,33,34 and television audio signals 41 itself realize that with time division way multichannel is synthetic, at digital processor 1,2,3, carry out in 4 becoming digital signal streams after digital coding is handled, send into digital modulator 5 then respectively, 6,7, modulation in 8, promptly these flows of data signals are modulated to four the tunnel respectively and pay carrier (boc) modulated signals 43,44,45, on 46, wherein at least one road is a digital modulation signals, it occupies 6 to 9.5 megahertz bandwidth, four the tunnel pay the carrier (boc) modulated signals information rate, wherein one the tunnel is 2048Kb/s, other three the tunnel looks its specific requirement is the highest can to reach 2048Kb/s, and its frequency is selected in 6 to 9.5MHZ.Each pair carrier (boc) modulated signals 43,44,45,46 and PAL-D standard television analog signals therewith 35 in capacity extended digital and analog blender 9 on base band the frequency division multiplex (MUX) close the road; realize the capacity extended digital and analog mixed transport; PAL-D standard television analog signals therewith occupies 0-6 megahertz bandwidth, pays carrier wave for four and accounts for 6-9.5 megahertz bandwidth.Then capacity extended digital and analog mixed signal on this base band is passed through frequency modulator 10, upconverter 11, channel 12 transfer out, and are undertaken by its inverse process at receiving terminal, have realized the capacity extended digital and analog mixed transport mode of the PAL-D television system that China is existing.
The present invention has following advantage compared to existing technology: base band of the present invention is paid carrier wave can reach four the tunnel, it can be digital that these base band are paid carrier wave, also can simulate, but at least one road is a digital modulation pays carrier wave, therefore can increase the transport communication capacity biglyyer, enlarge range of application, also can increase simultaneously the duties monitoring, sound accompaniment and telephone path capacity, make more perfect function, the present invention's high communication quality in big volume transport scope, cost is low, and can be used for the satellite communication channel by the equipment of the present invention's development, in microwave radio-relay communication channel and the fiber optic communication channel, easy to utilize.
Below in conjunction with accompanying drawing the present invention is described in further detail.
Fig. 1 is the functional-block diagram of the embodiment of the invention.
With reference to Fig. 1; the present invention is by digital processor 1,2,3,4; digital modulator 5,6,7,8; capacity extended digital and analog blender 9; frequency modulator 10, upconverter 11, channel 12, low-converter 13, frequency discriminator 14; capacity extended digital and analog separator 15, digital demodulator 16,17,18,19, number go processor 20,21,22,23 to form.Voice signal or computer data; pilot signal and other data-signal 31; 32; 33; 34 and television audio signals 41 they itself realize that with time division way multichannel is synthetic; import digital processor 1 respectively; 2; 3; carry out in 4 becoming digital signal streams after digital coding is handled; embodiment four way word signal flows wherein two-way are PCM pulse code modulation digital signal flow; two-way is a DM delta modulation digital signal streams in addition; import audio signal 41 in the way code processor therein simultaneously; each digital signal streams is imported corresponding digital modulator 5 respectively; 6; 7; in 8; its effect is these flows of data signals to be modulated to four the tunnel respectively pay carrier (boc) modulated signals 43; 44; 45; on 46; embodiment digital modulator 5; 6; 7; 8 wherein two be the QPSK four phase modulation; two is FSK frequency shift keying modulator in addition; pay carrier (boc) modulated signals 43; 44; 45; 46 embodiment frequencies are elected 7.09379 megahertzes respectively as; 8 megahertzes; 8.5 megahertz; 9 megahertzes; information rate one tunnel is 2048Kb/s; three the tunnel is 64kb/s in addition; pay carrier (boc) modulated signals 43 four the tunnel then; 44; 45; 46 with PAL-D standard television analog signals therewith 35 in capacity extended digital and analog blender 9, be mixed into a compound baseband signal; frequency division closes the road multiplex (MUX) on base band; realize the capacity extended digital and analog mixed transport; digital signal and analog signal are fully isolated; make mutual interference reach minimum; then capacity extended digital and analog mixed signal on this base band is sent into and carried out frequency modulation(FM) in the frequency modulator 10; be modulated on 70 mhz frequencys; send into again in the upconverter 11; its frequency is operated on 1935 megahertzes, and channel 12 transfers out the capacity extended digital and analog mixed signal.
At receiving terminal; operation of receiver is on 1935 mhz frequencys; the capacity extended digital and analog mixed signal input low-converter 13 that receives; make it be reduced into the modulating frequency of 70 megahertzes; send into again in the capacity extended digital and analog separator 15 of frequency discriminator 14; the television analog signals therewith 40 and four tunnel that decomposites the PAL-D standard is paid carrier (boc) modulated signals 47; 48; 49; 50; isolated four the tunnel pay carrier (boc) modulated signals 47; 48; 49; 50 import four corresponding digital modulators 16 respectively; 17; 18; in 19; the information rate one tunnel that demodulates is 2048kb/s; the 3rd is 64kb/s; embodiment digital modulator 16; 17; 18; 19 wherein two be Qpsk four phase demodulators; two is the FSK frequency shift keying demodulator in addition; four circuit-switched data signal flows are imported number respectively and are removed processor 20 after the demodulation; 21; 22; in 23; number removes processor 20; 21; 22; 23 decomposite voice signal formula computer data respectively; duties pilot signal and other data-signal 36; 37; 38; 39; and one of them number goes processor also to decomposite audio signal 42, reaches the purpose of capacity extended digital and analog mixed transport.
Claims (2)
1; a kind of by digital processor 1; 2; 3; digital modulator 5; 6; 7; 8; frequency modulator 10; upconverter 11; channel 12; low-converter 13; frequency discriminator 14; digital demodulator 16; 17; 18; 19; number removes processor 20; 21; 22; the capacity extended digital and analog mixed transmission method of the 23 capacity extended digital and analog mixed transport circuit of being formed is base band frequency division multiplex (MUX); TV with the PAL-D standard is an analog signal; it is characterized in that; the television analog signals therewith of PAL-D standard occupies 0 to 6 megahertz bandwidth; in 6 to 9.5 megahertz bandwidth, can contain nearly and four the tunnel pay carrier (boc) modulated signals; wherein at least one road is a digital modulation signals; pay carrier (boc) modulated signals and can transmit voice signal, or the transmission computer data; pilot signal and other data-signal.
2, capacity extended digital and analog mixed transmission method according to claim 1 has a capacity extended digital and analog blender 9 and a capacity extended digital and analog separator 15 in the capacity extended digital and analog mixed transport circuit that it is characterized in that being constituted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90103174 CN1057936A (en) | 1990-06-26 | 1990-06-26 | Capacity extended digital and analog mixed transmission method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90103174 CN1057936A (en) | 1990-06-26 | 1990-06-26 | Capacity extended digital and analog mixed transmission method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1057936A true CN1057936A (en) | 1992-01-15 |
Family
ID=4877947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90103174 Pending CN1057936A (en) | 1990-06-26 | 1990-06-26 | Capacity extended digital and analog mixed transmission method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1057936A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101505387B (en) * | 2008-12-02 | 2013-04-17 | 北京中星微电子有限公司 | Audio mode identification circuit and audio mode identification method |
| CN105955105A (en) * | 2016-04-29 | 2016-09-21 | 北京卫星制造厂 | Satellite instruction driving capacity expanding circuit |
-
1990
- 1990-06-26 CN CN 90103174 patent/CN1057936A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101505387B (en) * | 2008-12-02 | 2013-04-17 | 北京中星微电子有限公司 | Audio mode identification circuit and audio mode identification method |
| CN105955105A (en) * | 2016-04-29 | 2016-09-21 | 北京卫星制造厂 | Satellite instruction driving capacity expanding circuit |
| CN105955105B (en) * | 2016-04-29 | 2018-10-09 | 北京卫星制造厂 | Order-driven expansion circuit on a kind of star |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5521943A (en) | COFDM combined encoder modulation for digital broadcasting sound and video with PSK, PSK/AM, and QAM techniques | |
| AU648472B1 (en) | Frequency-multiplexed cellular telephone cell site base station and method of operating the same | |
| JP4269003B2 (en) | Digital broadcast receiver compatible with amplitude modulation | |
| US4092596A (en) | Data transmission and reception system | |
| JPH0698046A (en) | System for delivery of radiotelephony signal via cable television network | |
| WO1994011954A1 (en) | Fm radio system using time shared wide sca band for digital data | |
| CA2092495A1 (en) | Communication system | |
| WO1998008345B1 (en) | System for use in television roll-off band channels for data transfer over a network | |
| CA2106919A1 (en) | Communication System | |
| RU97122267A (en) | METHOD FOR PROCESSING COMMUNICATION SIGNALS IN A SUBSCRIBER ITEM OF A WIRELESS TELECOMMUNICATION SYSTEM | |
| US5491832A (en) | Cellular radio communications system | |
| MY127274A (en) | Multiresolution transmission system | |
| US6831907B2 (en) | Digital format U.S. commercial FM broadcast system | |
| US5515397A (en) | PCM subcode communications technique between a regional radio transmitter/receiver and a regional switching center | |
| US6301310B1 (en) | Efficient implementation for systems using CEOQPSK | |
| JPH08181661A (en) | Radio signal transmitter | |
| CN1057936A (en) | Capacity extended digital and analog mixed transmission method | |
| CN102196111A (en) | Short-wave two-path modulator-demodulator | |
| CN87103217A (en) | Digital-analog combining transmission method | |
| Wells | SSB modulation for VHF mobile and handportable transceivers | |
| WO1998012826A1 (en) | Signalling method and transmitter used in a digital radio system | |
| Yam et al. | An innovative AM broadcasting system for voice and data information | |
| JPS6256031A (en) | Broadcast system | |
| CN1103740A (en) | Broadcasting paging technology using frequency-modulation broadcast subchannel | |
| JPS55154839A (en) | Mobile radio equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |