CN100454990C - Decoder and decoding method for specifications of multiple audio signal - Google Patents
Decoder and decoding method for specifications of multiple audio signal Download PDFInfo
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- CN100454990C CN100454990C CNB2004100342700A CN200410034270A CN100454990C CN 100454990 C CN100454990 C CN 100454990C CN B2004100342700 A CNB2004100342700 A CN B2004100342700A CN 200410034270 A CN200410034270 A CN 200410034270A CN 100454990 C CN100454990 C CN 100454990C
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Abstract
The present invention provides a decoding device used for decoding to a simulation audio message signal. The decoding device comprises a radio frequency modulator, an analog/digital converter, a digital frequency demultiplier and a digital signal processor which can be controlled by a program, wherein the radio frequency modulator receives a simulation audio message signal and provides a simulation audio message intermediate frequency signal which can serve as representation. The simulation audio message signal is a simulation signal, and the center frequency of the carrier is a first carrier frequency (Cf1). The simulation audio message intermediate frequency signal is also a simulation signal, and the center frequency of the carrier is a second carrier frequency (Cf2). The analog/digital converter samples the simulation audio message intermediate frequency signal and converts the simulation audio message intermediate frequency signal into a digital audio message intermediate frequency signal. The digital frequency demultiplier decreases the frequency of the digital audio message intermediate frequency signal so as to generate a base frequency signal. The digital signal processor which can be controlled by a program demodulate the base frequency signal according to a demodulating and decoding program with a predetermined specification, and decode the demodulated base frequency signal so as to output an output signal which accords with the predetermined specification.
Description
Technical field
The present invention relates to a kind of decoding device and method of audio signal, particularly relate to decoding device and method applicable to multiple audio signal specification.
Background technology
The known audio signal that applies to TV and video system has the different coding/decoding specification of many kinds, for example is applied to BTSC (the broadcast television system committee) specification of the U.S., the FM/FM specification that is applied to Japan and A2 specification etc.
See also Fig. 1, Fig. 1 is known one audio signal decoder 10 schematic diagrames that meet the BTSC specification.The audio signal decoder 10 of the known BTSC of meeting specification comprises a radio frequency frequency modulator 12 (RFtuner), an analog/digital converter 14 (A/D converter), a processor 16 (processor) and a digital btsc decoder device 18 (digital BTSC decoder).
Radio frequency frequency modulator 12 receives a BTSC simulated audio signal 20, and converts BTSC simulated audio signal 20 to a BTSC analogue audio frequency intermediate-freuqncy signal 22.14 of analog/digital converters convert BTSC analogue audio frequency intermediate-freuqncy signal 22 to a BTSC digital audio intermediate-freuqncy signal 24.16 BTSC digital audio intermediate-freuqncy signals 24 according to input of processor calculate a MTS restituted signal 26 (multi-channel television sound demodulated signal).Include in the MTS restituted signal 26 an addition audio output signal 28 (sum signal, R+L) and one subtract each other audio output signal 30 (amplitude-modulated difference signal, L-R).18 demodulating and decoding programs according to the BTSC specification of numeral btsc decoder device with 26 decodings of MTS restituted signal, and produce addition audio output signal 28 and subtract each other audio output signal 30.
At the known audio signal decoder that applies to TV and video system, it is the audio signal decoder that cooperates special usefulness according to different coding/decoding specifications, so cause the inconvenience of audio signal decoding circuit design, therefore be necessary to provide a kind of decoding device and method, to increase the elasticity of audio signal decoding circuit design applicable to multiple audio signal specification.
Summary of the invention
Therefore, a purpose of the present invention provides a kind of decoding device and method of audio signal, particularly about decoding device and method applicable to multiple audio signal specification.Decoding device and the method for another object of the present invention for a kind of audio signal is provided can increase the elasticity of audio signal decoding circuit design.
Decoding device of the present invention is to be used for a simulated audio signal (analog audio signal) is decoded.This decoding device comprise a radio frequency frequency modulator (RF tuner), an analog/digital converter (A/Dconverter), a digital frequency demultiplier (digital down converter) and a program-controlled digital signal processor (programmable digital signal processor, DSP).
This radio frequency frequency modulator is used for receiving this simulated audio signal and an analogue audio frequency intermediate-freuqncy signal (analog sound intercarrier frequency (SIF) signal indicative thereof) that can be used as representative is provided.This simulated audio signal is an analog signal, and the centre frequency of its carrier wave is first carrier frequency (Cf1).The analogue audio frequency intermediate-freuqncy signal also is an analog signal, and the centre frequency of its carrier wave is second carrier frequency (Cf2).This analog/digital converter is used for the sampling frequency that is twice in this second carrier frequency (Cf2) at least with this analogue audio frequency intermediate-freuqncy signal sampling and be converted to a digital audio intermediate-freuqncy signal (digital SIF signal).This numeral frequency demultiplier is used for this digital audio intermediate-freuqncy signal frequency reducing to produce a fundamental frequency signal (basebandsignal).This program-controlled digital signal processor, and is decoded for the fundamental frequency signal after this demodulation this fundamental frequency signal demodulation (demodulate) according to the demodulating and decoding program of a predetermined dimension, meets the output signal of this predetermined dimension with output.
Difference according to the output signal specification, for example, be applied to BTSC (the broadcasttelevision system committee) specification of the U.S., the FM/FM specification that is applied to Japan and A2 specification etc., program-controlled digital signal processor can implanted corresponding demodulating and decoding program, so that program-controlled digital signal processor all can be carried out corresponding demodulating and decoding program for the signal of different size, to keep elasticity disposal ability (maintain flexibility for each standard) for each specification.
Decoding device of the present invention can be carried out corresponding demodulating and decoding program according to the difference of specification, and therefore decoding device of the present invention is a decoding device applicable to multiple audio signal specification.In addition, decoding device of the present invention has the function of frequency drift compensation.
Can be about the advantages and spirit of the present invention by detailed description of the present invention being further understood below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the known one audio signal decoder schematic diagram that meets the BTSC specification.
Fig. 2 is the decoding device schematic diagram of first embodiment of the invention.
Fig. 3 is a digital frequency demultiplier schematic diagram shown in Figure 2.
Fig. 4 is the function block schematic diagram of program-controlled digital signal processor shown in Figure 2.
Fig. 5 is the schematic diagram of the decoding device of second embodiment of the invention.
Fig. 6 is the function block schematic diagram of program-controlled digital signal processor among Fig. 5.
Fig. 7 is the schematic diagram of third embodiment of the invention decoding device.
Fig. 8 is a Xie Code method flow diagram of the present invention.
The reference numeral explanation
10: audio signal decoder 12,44,108: radio frequency frequency modulator
14,46: analog/digital converter 16: processor
18: digital btsc decoder device 20,86:BTSC simulated audio signal
22,88:BTSC analogue audio frequency intermediate-freuqncy signal
24,90:BTSC digital audio intermediate-freuqncy signal
26,104:MTS restituted signal
28,94: the addition audio output signal
30,96: subtract each other audio output signal
40,100,110: decoding device
42: simulated audio signal 48: digital frequency demultiplier
50,51: program-controlled digital signal processor
52: the analogue audio frequency intermediate-freuqncy signal
54: digital audio intermediate-freuqncy signal 56: fundamental frequency signal
57: the fundamental frequency signal 58 of adjustment: output signal
59: the output signal 60 of adjustment: carrier resetting signal
62: frequency mixer 63: filter
64: frequency demultiplier 66: local oscillator
68: the digital audio intermediate-freuqncy signal after the mixing
70: filtering signal 72: memory module
74: demodulation module 76: decoder module
78: detection module 80: the demodulating and decoding program
82: the fundamental frequency signal 83 after the demodulation: the fundamental frequency signal of the adjustment after the demodulation
84: trace routine 92:BTSC fundamental frequency signal
98:BTSC demodulating and decoding program 102: fm demodulation program
106: decoding program 112: the analogue audio frequency fundamental frequency signal
Cf1: first carrier frequency Cf2: second carrier frequency
Cf3: the 3rd carrier frequency Sf1: first sampling frequency
Sf2: the second sampling frequency Sf3: the 3rd sampling frequency
Embodiment
See also Fig. 2, Fig. 2 is decoding device 40 schematic diagrames of first embodiment of the invention.The decoding device 40 of present embodiment is used for a simulated audio signal 42 (analog audio signal) is decoded.Decoding device 40 comprise a radio frequency frequency modulator 44 (RF tuner), an analog/digital converter 46 (A/Dconverter), a digital frequency demultiplier 48 (digital down converter) and a program-controlled digital signal processor 50 (programmable digital signal processor, DSP).
Radio frequency frequency modulator 44 is used for receiving simulated audio signal 42, and an analogue audio frequency intermediate-freuqncy signal 52 (analog sound intercarrier frequency (SIF) signal indicativethereof) that can be used as representative is provided.Simulated audio signal 42 is analog signals, and the centre frequency of its carrier wave is first carrier frequency (Cf1).In the present embodiment, the scope of first carrier frequency Cf1 is between 10MHz to 1GHz (1000MHz).Analogue audio frequency intermediate-freuqncy signal 52 also is an analog signal, and the centre frequency of its carrier wave is second carrier frequency (Cf2).In the present embodiment, the scope of the second carrier frequency Cf2 is between between the 4MHz to 12MHz.
Analog/digital converter 46 is used for the sampling frequency that is twice in Cf2 at least with 52 samplings of analogue audio frequency intermediate-freuqncy signal and be converted to a digital audio intermediate-freuqncy signal 54 (digital SIF signal).Digital audio intermediate-freuqncy signal 54 is digital signals, and the centre frequency of its carrier wave is still kept and analogue audio frequency intermediate-freuqncy signal 52 identical (being between the 4MHz to 12MHz in the present embodiment), and its digital signal sampling frequency is the first sampling frequency Sf1.In the present embodiment, the first sampling frequency Sf1 is at least the twice of the second carrier frequency Cf2, therefore if the scope of the second carrier frequency Cf2 between 4MHz to 12MHz, then the first sampling frequency Sf1 is at least more than the 8MHz.
See also Fig. 3, Fig. 3 is digital frequency demultiplier 48 schematic diagrames shown in Figure 2.Numeral frequency demultiplier 48 comprises a frequency mixer 62 (mixer), a filter 63 and a frequency demultiplier 64 (down samplingdevice).Frequency mixer 62 comprises a local oscillator 66.Digital audio intermediate-freuqncy signal 68 after frequency mixer 62 is used for the local oscillated signal (not being shown in Fig. 3) that digital audio intermediate-freuqncy signal 54 and local oscillator 66 produce carried out mixing and produce a mixing removes with the carrier wave with digital audio intermediate-freuqncy signal 54.Digital audio intermediate-freuqncy signal 68 after the mixing is a digital signal, and its carrier wave is removed, and its sampling frequency is still kept and digital audio intermediate-freuqncy signal 54 identical (being greater than 8MHz in the present embodiment).Filter 63 is used for noise filtering with the digital audio intermediate-freuqncy signal 68 after the mixing to produce a filtering signal 70.Frequency demultiplier 64 is used for filtering signal 70 is reduced sampling number, to produce fundamental frequency signal 56.Fundamental frequency signal 56 is a digital signal, owing to handle through frequency demultiplier 64, so the digital audio intermediate-freuqncy signal 68 of its sampling frequency after than mixing is low.The sampling frequency of fundamental frequency signal 56 is the second sampling frequency Sf2.In the present embodiment, the second sampling frequency Sf2 is less than 4MHz.
See also Fig. 4, Fig. 4 is the function block schematic diagram of program-controlled digital signal processor 50 shown in Figure 2.Program-controlled digital signal processor 50 comprises a demodulation module 74, a decoder module 76 and a detection module 78.The memory module 72 of program-controlled digital signal processor 50 outsides is in order to store at least one demodulating and decoding program 80.Demodulating and decoding program 80 is used for carrying out for fundamental frequency signal 56 the demodulating and decoding program of these predetermined dimensions, with fundamental frequency signal 56 demodulation, and decode for the fundamental frequency signal after the demodulation 56, and output meets the output signal of this predetermined dimension.Need to prove that because present embodiment is to adopt program-controlled digital signal processor, therefore demodulation module 74, decoder module 76 and detection module 78 here all realized with the program of digital signal processor, but not realizes with the hardware circuit of special use.
Demodulation module 74 is by demodulating and decoding program 80, with fundamental frequency signal 56 demodulation (demodulate).Decoder module 76 is decoded the fundamental frequency signal after the demodulation 82 by demodulating and decoding program 80, and output meets the output signal 58 of this predetermined dimension.
Compared to known audio signal decoder 10, it only can be applicable to the demodulating and decoding program of single specification, decoding device 40 of the present invention can be according to the difference of specification, carry out corresponding demodulating and decoding program, therefore decoding device 40 of the present invention is a decoding device 40 applicable to multiple audio signal specification.
See also Fig. 2 to Fig. 4.Program-controlled digital signal processor 50 further comprises a trace routine 84 to detect an average level value of output signal 58, and when this average level value does not conform to a fiduciary level value of presetting, export a carrier resetting signal 60 (Carrier Recovery) to frequency mixer 62, with the frequency of oscillation of the local oscillator signals of adjusting local oscillator 66, and then the fundamental frequency signal 57 that digital frequency demultiplier 48 outputs one are adjusted.
Program-controlled digital signal processor 50 is carried out the demodulating and decoding program of this predetermined dimension, with fundamental frequency signal 57 demodulation (demodulate) that will adjust, and the fundamental frequency signal 83 for the adjustment after the demodulation is decoded, the output signal 59 that meets the adjustment of this predetermined dimension with output, and the average level value of the output signal of adjusting 59 accords with this default fiduciary level value.
Compared to known audio signal decoder 10, decoding device 40 of the present invention has the function of frequency drift compensation.In the audio signal decoding program, because electronic component error or Effect of Environmental (for example temperature), and cause the drift of signal frequency value, and influence the quality of output signal.Decoding device 40 of the present invention can be realized the function of frequency drift compensation by detection module 78, trace routine 84 and relevant effect.
See also Fig. 5 and Fig. 6, Fig. 5 is the schematic diagram of second embodiment of the invention decoding device 100, and Fig. 6 is the function block schematic diagram of program-controlled digital signal processor 51 among Fig. 5.The decoding device 100 of second embodiment of the invention is used to meet a BTSC simulated audio signal 86 decodings of BTSC specification, and the program-controlled digital signal processor 51 of decoding device 100 is carried out its function according to a demodulating and decoding program that meets the BTSC specification.BTSC simulated audio signal 86 input radio frequency frequency modulators 44 are to produce a BTSC analogue audio frequency intermediate-freuqncy signal 88, BTSC analogue audio frequency intermediate-freuqncy signal 88 input analog/digital converters 46 are to produce a BTSC digital audio intermediate-freuqncy signal 90, BTSC digital audio intermediate-freuqncy signal 90 inputs to digital frequency demultiplier 48 producing a BTSC fundamental frequency signal 92, and BTSC fundamental frequency signal 92 inputs to program-controlled digital signal processor 51 and exports an addition audio output signal 94 (summedL+R audio output signal) and and subtract each other audio output signal 96 (difference L-R audiooutput signal).
As shown in Figure 6, in the memory module 72 of program-controlled digital signal processor 51 outsides, demodulating and decoding program 98 is a BTSC demodulating and decoding program 98, and BTSC demodulating and decoding program 98 comprises a fm demodulation program 102 (FM demodulation program) to carry out demodulation for BTSC fundamental frequency signal 92 and to produce a MTS restituted signal 104 (multichannel television sound demodulatedsignal).BTSC demodulating and decoding program 98 also comprises a decoding program 106 decoding for MTS restituted signal 104, and produces addition audio output signal 94 (summed L+R audio outputsignal) and subtract each other audio output signal 96 (difference L-R audio output signal).
See also Fig. 7, Fig. 7 is the schematic diagram of third embodiment of the invention decoding device 110.The main difference of the 3rd embodiment decoding device 110 and the first embodiment decoding device 40 is the radio frequency frequency modulator.The radio frequency frequency modulator 108 of decoding device 110 (RF tuner) is used for receiving simulated audio signal 42 and an analogue audio frequency fundamental frequency signal 112 (analog sound baseband frequency signalindicative thereof) that can be used as representative is provided.Simulated audio signal 42 is analog signals, and the centre frequency of its carrier wave is first carrier frequency (Cf1).In the present embodiment, the scope of first carrier frequency Cf1 is between 10MHz to 1GHz (1000MHz).Analogue audio frequency fundamental frequency signal 112 also is an analog signal, and its carrier frequency directly drops to the 3rd carrier frequency (Cf3) from first carrier frequency (Cf1), and the scope of the 3rd carrier frequency Cf3 of present embodiment is about less than 2MHz.Analog/digital converter 46 is taken a sample analogue audio frequency fundamental frequency signal 112 with the sampling frequency that is twice in the 3rd carrier frequency Cf3 at least and is converted to a fundamental frequency signal 56.Fundamental frequency signal 56 is a digital signal, and its sampling frequency is the 3rd sampling frequency Sf3.In the present embodiment, the 3rd sampling frequency Sf3 is less than 4MHz.
Illustrate further, the radio frequency frequency modulator 108 of third embodiment of the invention decoding device 110 and the decoding device 40 of first and second embodiment of the present invention, 100 radio frequency frequency modulator 44 differences, after radio frequency frequency modulator 108 receives simulated audio signal 42, it directly is the simulated audio signal 42 of first carrier frequency (Cf1) with centre carrier frequency, converting centre carrier frequency to is the analogue audio frequency fundamental frequency signal 112 of the 3rd carrier frequency (Cf3), wherein the scope of the 3rd carrier frequency (Cf3) is about the value less than 2MHz in the 3rd embodiment, be a fundamental frequency signal, therefore do not need through frequency demultiplier carrier frequency to be reduced again.Therefore, compared with decoding device 40,100, the three embodiment decoding devices 110 and the nil frequency demultipliers 48 of first and second embodiment.
See also Fig. 8, Fig. 8 is a coding/decoding method flow chart of the present invention.The first embodiment decoding device 40 with Fig. 2 to Fig. 4 is an example, and coding/decoding method of the present invention comprises the following step:
S200: receive simulated audio signal 42, and an analogue audio frequency intermediate-freuqncy signal 52 (analog sound intercarrier frequency (SIF) signal indicatiVe thereof) that can be used as representative is provided.The carrier frequency of simulated audio signal 42 is first carrier frequency (Cf1).In the present embodiment, the scope of first carrier frequency Cf1 is between 10MHz to 1GHz (1000MHz).The carrier frequency of analogue audio frequency intermediate-freuqncy signal 52 is second carrier frequency (Cf2).In the present embodiment, the scope of the second carrier frequency Cf2 is between between the 4MHz to 12MHz.
S210: with the sampling frequency that is twice in Cf2 at least with 52 samplings of analogue audio frequency intermediate-freuqncy signal and be converted to a digital audio intermediate-freuqncy signal 54 (digital SIF signal).The carrier frequency of digital audio intermediate-freuqncy signal 54 is still kept and analogue audio frequency intermediate-freuqncy signal 52 identical (being between the 4MHz to 12MHz in the present embodiment).The digital signal sampling frequency of digital audio intermediate-freuqncy signal 54 is the first sampling frequency Sf1.The first sampling frequency Sf1 is at least the twice of the second carrier frequency Cf2, therefore if the scope of the second carrier frequency Cf2 between 4MHz to 12MHz, then the first sampling frequency Sf1 is at least more than the 8MHz.
S220: a digital audio intermediate-freuqncy signal 54 and a local oscillated signal are carried out mixing, and produce the digital audio intermediate-freuqncy signal 68 after the mixing, remove with carrier wave with digital audio intermediate-freuqncy signal 54.
S224: with the noise filtering of the digital audio intermediate-freuqncy signal 68 after the mixing to produce a filtering signal 70.
S230: filtering signal 70 is reduced sampling number, to produce fundamental frequency signal 56.The sampling frequency of fundamental frequency signal 56 is low than digital audio intermediate-freuqncy signal 54.The sampling frequency of fundamental frequency signal 56 is the second sampling frequency Sf2.In the present embodiment, the second sampling frequency Sf2 is less than 4MHz.
S240:, and decode fundamental frequency signal 56 demodulation (demodulate) according to the demodulating and decoding program of a predetermined dimension, meet the output signal 58 of this predetermined dimension with output for the fundamental frequency signal after the demodulation 82.
S250: an average level value that detects output signal 58 with trace routine 84, and when this average level value does not conform to a fiduciary level value of presetting, export a carrier resetting signal 60 (CarrierRecovery), adjusting this local oscillated signal, and then the fundamental frequency signal of adjusting in step S230 output one 57.
In the coding/decoding method of the present invention, difference according to output signal 58 specifications, the demodulating and decoding program of this predetermined dimension can all can be carried out corresponding demodulating and decoding program 80 for the signal of different size, to keep the elasticity disposal ability (maintain flexibility for each standard) for each specification.
Compared to known audio signal decoding technology, decoding device of the present invention and method can be carried out corresponding demodulating and decoding program according to the difference of specification, and therefore coding/decoding method of the present invention is a coding/decoding method applicable to multiple audio signal specification.In addition, decoding device of the present invention has the function of frequency drift compensation.
By the above detailed description of preferred embodiments, be to wish to know more to describe feature of the present invention and spirit, and be not to come category of the present invention is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that hope can contain in the category that is arranged in claim of the present invention of various changes and tool equality.
Claims (14)
1. a decoding device is used for a simulated audio signal is decoded, and comprises:
One radio frequency frequency modulator, be used for receiving this simulated audio signal and an analogue audio frequency intermediate-freuqncy signal that can be used as representative is provided, the centre carrier frequency of this simulated audio signal is a first carrier frequency, and the centre carrier frequency of this analogue audio frequency intermediate-freuqncy signal is one second carrier frequency;
One analog/digital converter, be used for the sampling frequency that is twice in this second carrier frequency at least with this analogue audio frequency intermediate-freuqncy signal sampling and be converted to a digital audio intermediate-freuqncy signal, and the centre carrier frequency of this digital audio intermediate-freuqncy signal still is this second carrier frequency;
One digital frequency demultiplier is used for this digital audio intermediate-freuqncy signal frequency reducing to produce a fundamental frequency signal; And
One program-controlled digital signal processor, can implant different demodulating and decoding programs according to the fundamental frequency signal of different size, this fundamental frequency signal is carried out demodulation according to the demodulating and decoding program of corresponding predetermined dimension, and decode for the fundamental frequency signal after this demodulation, meet the output signal of this predetermined dimension with output.
2. decoding device as claimed in claim 1 wherein should comprise by the numeral frequency demultiplier:
One frequency mixer is used for this a digital audio intermediate-freuqncy signal and a local oscillated signal are carried out mixing, removes with the carrier wave with this digital audio intermediate-freuqncy signal, to produce the digital audio intermediate-freuqncy signal after the mixing;
One filter is used for noise filtering with the digital audio intermediate-freuqncy signal after this mixing to produce a filtering signal; And
One frequency demultiplier is used for this filtering signal is reduced sampling number, to produce this fundamental frequency signal.
3. decoding device as claimed in claim 1, wherein this demodulating and decoding program is a BTSC demodulating and decoding program, this BTSC demodulating and decoding program comprises:
One fm demodulation program is to carry out demodulation and to produce a MTS restituted signal for this fundamental frequency signal; And
One decoding program to be decoding for this MTS restituted signal, and produces an addition audio output signal and and subtract each other audio output signal.
4. decoding device as claimed in claim 2, wherein this program-controlled digital signal processor further detects an average level value of this output signal with a trace routine, and when this average level value does not conform to a fiduciary level value of presetting, export a carrier resetting signal to this frequency mixer, adjusting this local oscillated signal, and then the fundamental frequency signal that this numeral frequency demultiplier output one is adjusted.
5. decoding device as claimed in claim 4, wherein the average level value of the fundamental frequency signal of this adjustment accords with this default fiduciary level value.
6. a coding/decoding method is used for a simulated audio signal is decoded, and this coding/decoding method comprises the following step:
(a) receive this simulated audio signal, and an analogue audio frequency intermediate-freuqncy signal that can be used as representative is provided, the centre carrier frequency of this simulated audio signal is a first carrier frequency, and the centre carrier frequency of this analogue audio frequency intermediate-freuqncy signal is one second carrier frequency;
(b) with the sampling frequency that is twice in this second carrier frequency at least with this analogue audio frequency intermediate-freuqncy signal sampling and be converted to a digital audio intermediate-freuqncy signal, and the centre carrier frequency of this digital audio intermediate-freuqncy signal still is this second carrier frequency;
(c) with this digital audio intermediate-freuqncy signal frequency reducing to produce a fundamental frequency signal; And
(d) implant different demodulating and decoding programs according to the fundamental frequency signal of different size, this fundamental frequency signal is carried out demodulation according to the demodulating and decoding program of corresponding predetermined dimension, and decode for the fundamental frequency signal after this demodulation, meet the output signal of this predetermined dimension with output.
7. coding/decoding method as claimed in claim 6, wherein this step (c) comprises:
A this digital audio intermediate-freuqncy signal and a local oscillated signal are carried out mixing, remove, to produce the digital audio intermediate-freuqncy signal after the mixing with carrier wave with this digital audio intermediate-freuqncy signal;
With the noise filtering of the digital audio intermediate-freuqncy signal after this mixing to produce a filtering signal; And
Then this filtering signal is reduced sampling number, to produce this fundamental frequency signal.
8. coding/decoding method as claimed in claim 6, wherein this demodulating and decoding program is a BTSC demodulating and decoding program, this BTSC demodulating and decoding program comprises:
One fm demodulation program is to carry out demodulation and to produce a MTS restituted signal for this fundamental frequency signal; And
One decoding program to be decoding for this MTS restituted signal, and produces an addition audio output signal and and subtract each other audio output signal.
9. coding/decoding method as claimed in claim 7, wherein this step (d) further comprises an average level value that detects this output signal with a trace routine, and when this average level value does not conform to a fiduciary level value of presetting, export a carrier resetting signal, adjusting this local oscillated signal, and then the fundamental frequency signal of adjusting in step (c) output one.
10. coding/decoding method as claimed in claim 9, wherein the average level value of the fundamental frequency signal of this adjustment accords with this default fiduciary level value.
11. a decoding device is used for a simulated audio signal is decoded, and comprises:
One radio frequency frequency modulator, be used for receiving this simulated audio signal and an analogue audio frequency fundamental frequency signal that can be used as representative is provided, the centre carrier frequency of this simulated audio signal is a first carrier frequency, and the centre carrier frequency of this analogue audio frequency fundamental frequency signal is one the 3rd carrier frequency;
One analog/digital converter is used for the sampling frequency that is twice in the 3rd carrier frequency at least with this analogue audio frequency fundamental frequency signal sampling and be converted to a fundamental frequency signal; And
One program-controlled digital signal processor, fundamental frequency signal according to different size is implanted different demodulating and decoding programs, this fundamental frequency signal is carried out demodulation according to the demodulating and decoding program of corresponding predetermined dimension, and decode for the fundamental frequency signal after this demodulation, meet the output signal of this predetermined dimension with output.
12. decoding device as claimed in claim 11, wherein this demodulating and decoding program is a BTSC demodulating and decoding program, and this BTSC demodulating and decoding program comprises:
One fm demodulation program is to carry out demodulation and to produce a MTS restituted signal for this fundamental frequency signal; And
One decoding program to be decoding for this MTS restituted signal, and produces an addition audio output signal and and subtract each other audio output signal.
13. a coding/decoding method is used for a simulated audio signal is decoded, this coding/decoding method comprises the following step:
(a) receive this simulated audio signal, and an analogue audio frequency fundamental frequency signal that can be used as representative is provided, the centre carrier frequency of this simulated audio signal is a first carrier frequency, and the centre carrier frequency of this analogue audio frequency fundamental frequency signal is one the 3rd carrier frequency;
(b) with the sampling frequency that is twice in the 3rd carrier frequency at least with this analogue audio frequency intermediate-freuqncy signal sampling and be converted to a fundamental frequency signal; And
(c) implant different demodulating and decoding programs according to the fundamental frequency signal of different size, this fundamental frequency signal is carried out demodulation according to the demodulating and decoding program of corresponding predetermined dimension, and decode for the fundamental frequency signal after this demodulation, meet the output signal of this predetermined dimension with output.
14. coding/decoding method as claimed in claim 13, wherein this demodulating and decoding program is a BTSC demodulating and decoding program, and this BTSC demodulating and decoding program comprises:
One fm demodulation program is to carry out demodulation and to produce a MTS restituted signal for this fundamental frequency signal; And
One decoding program to be decoding for this MTS restituted signal, and produces an addition audio output signal and and subtract each other audio output signal.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09312582A (en) * | 1996-05-21 | 1997-12-02 | Pioneer Electron Corp | Digital broadcast receiver having transmission mode discriminating function |
| US20020126703A1 (en) * | 2001-03-06 | 2002-09-12 | Kovacevic Branko D. | System for digitized audio stream synchronization and method thereof |
| US20020167423A1 (en) * | 1999-07-09 | 2002-11-14 | Matthias Vierthaler | Method and circuit for decoding an analog audio signal using the BTSC standard |
| US20030162517A1 (en) * | 2002-02-26 | 2003-08-28 | Wu David Chaohua | Scaling adjustment using pilot signal |
| US20030197810A1 (en) * | 2000-12-15 | 2003-10-23 | Broadcom Corporation | Digital IF demodulator with carrier recovery |
-
2004
- 2004-04-05 CN CNB2004100342700A patent/CN100454990C/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09312582A (en) * | 1996-05-21 | 1997-12-02 | Pioneer Electron Corp | Digital broadcast receiver having transmission mode discriminating function |
| US20020167423A1 (en) * | 1999-07-09 | 2002-11-14 | Matthias Vierthaler | Method and circuit for decoding an analog audio signal using the BTSC standard |
| US20030197810A1 (en) * | 2000-12-15 | 2003-10-23 | Broadcom Corporation | Digital IF demodulator with carrier recovery |
| US20020126703A1 (en) * | 2001-03-06 | 2002-09-12 | Kovacevic Branko D. | System for digitized audio stream synchronization and method thereof |
| US20030162517A1 (en) * | 2002-02-26 | 2003-08-28 | Wu David Chaohua | Scaling adjustment using pilot signal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1681302A (en) | 2005-10-12 |
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