CN1929311B - Coder-decoder using single simulation to digital transducer and signal processing method - Google Patents
Coder-decoder using single simulation to digital transducer and signal processing method Download PDFInfo
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- CN1929311B CN1929311B CN200610127836A CN200610127836A CN1929311B CN 1929311 B CN1929311 B CN 1929311B CN 200610127836 A CN200610127836 A CN 200610127836A CN 200610127836 A CN200610127836 A CN 200610127836A CN 1929311 B CN1929311 B CN 1929311B
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Abstract
This invention provides one coding and signal process method to operates single mode digital converter and several analogue signals, which comprises the following parts: one multi-catch modulation module to module several analogue signals into one first multiple memory catch signals to load several first analogue signals; one analogue digital converter coupled to the modulation to sample first multiple catch signals for analogue digital conversion to generate one second memory catch signals; multiple memory demodulation module coupled to analogue digital converter.
Description
Technical field
The invention relates to signal processing (signal processing), in particular to coder-decoder (coder-decoder, CODEC).
Background technology
Coder-decoder (coder-decoder, Codec) for a kind of in order to analog to digital translation (analog to digital conversion, ADC) or the numeral to analog-converted (digital to analog conversion, hardware circuit DAC).When analog signal is received by computer, mobile phone or other devices via the video signal source of microphone or other such as video tape or simulated television, just can rely on simulating of coder-decoder, to produce the audio signal samples or the vision signal sample of numeral to the digital translation function.Generally speaking, digital audio and video signals or the vision signal sample after conversion can be via further compression, to reduce the employed frequency range of these audio signals or vision signal.
Multiple access (Multiple Access) technology is mainly used in satellite communication and long-distance telecommunication at present, can make the single communication link of a communications satellite (communication satellite) or an interchanger (switching center) utilization that the service of many group ICBM SHF satellite terminal machines (satellite terminal) or mobile phone line is provided simultaneously.The function of multiple access mainly is the usefulness as control frequency range resource, this is because the radio frequency range that mobile phone uses is very limited, therefore the use of frequency range must be allocated at random, when just the user will make a phone call, system just assigns frequency range to use to the user, and behind end of conversation, fetch frequency range, use so that be assigned to the user that will make a phone call after a while.The mode of reaching multiple access has frequency division multiple access (frequency-division multiple access at present, FDMA), time division multiple access (time-division multiple access, TDMA), code division multiple access (code-division multiple access, CDMA) three kinds.
The mode of FDMA is directly cutting on frequency, total frequency range is cut into each etc. the channel of broadband, each channel can be for user's use.TDMA (as GSM) is cut into several smaller frequency bands earlier, cut into isometric time slot of time (Slot) then on each frequency band again, several slots is again in conjunction with framing (Frame), the number one time slot of each frame is formed the number one channel of TDMA, the rest may be inferred for all the other, each channel uses for a user, and so the signal of different user just is unlikely to overlapping.
The capacity of a mobile telephone system is just as the space of a meeting room, and FDMA and TDMA are separated into many little meeting rooms with large conference room, and the user wants the time spent, just divides and tasks a little meeting room, so can use to the multi-user; CDMA then is a compartment not, but different user uses different spreading codes (Spreading Code) to modulate, and receiver can filter out other subscriber signals and take out the information that needs according to different spreading codes.In other words, CDMA cans be compared in a room, the lineup is arranged simultaneously, and another organizes the English talk of human with the Chinese talk, can noisyly produce each other, be bigger noise promptly at Chinese hearer's ear Chinese and English, can't have influence on an identification capability of listening Chinese, therefore can be at one time, the space, many group human different languages talks are arranged.
In general Codec, each audio signal source or video signal source just need apply to an analog-to-digital converter, being number format with its self simulation format conversion. if run into when many group audio signal sources being arranged simultaneously or organizing the video signal source input more, for example must produce stereo but not during monophony, usually just need increase the number of analog-to-digital converter, allow the input of each audio signal source or video signal source corresponding simulating all be arranged separately to digital quantizer, the disposal ability of Codec could increase. and can cause analog-to-digital converter to occupy the excessive area of Codec chip like this, and increase Codec production cost of chip. for example in the Codec chip of handling dual track, 2 analog-to-digital converter modules have just occupied about 40% Codec chip area, cause the waste of the complicated and chip area of circuit. therefore, if in the Codec chip, can only use single simulation to digital transducer just can handle simultaneously and organize audio signal sources more or organize the video signal source input more, then can reduce the Codec production cost of chip effectively.
Summary of the invention
In view of this, the invention provides a kind of coder-decoder that uses single simulation to digital transducer (coder-decoder, Codec), in order to handle a plurality of analog signals simultaneously, to solve the problem that known techniques exists.In a form of implementation, this coder-decoder comprises: a time-division multiple access modulation module (multiple access modulator), in order to borrow a time-division multi-access mode that a plurality of first analog signals are modulated to one first time division multiple access signal, this first time division multiple access signal can carry these a plurality of first analog signals simultaneously, one is coupled to the analog-to-digital converter (analog todigital converter) of this time division multiple access modulation module, in order to this first time division multiple access signal of sampling to simulate conversion to numeral, and one second time division multiple access signal of generation digital form, one is coupled to the time division multiple access demodulation module (multiple accessdemodulator) of this analog-to-digital converter, be present in this time division multiple access way of this second time division multiple access signal in order to demodulation, correspond respectively to a plurality of first digital signals of these a plurality of first analog signals with generation; A plurality of input low pass filters, be coupled to the input of this time division multiple access modulation module, in order to the high-frequency noise of a plurality of second analog signals of filtering, and produce these a plurality of first analog signals, when preventing that this analog-to-digital converter from sampling because of distorted signals that intersymbol interference was produced; A plurality of output low pass filters, be coupled to the output of this time division multiple access demodulation module, is high-frequency noise that low frequency process produced from high frequency conversion in order to these a plurality of first digital signals of filtering in this time division multiple access demodulation module, and producing a plurality of second digital signals, these a plurality of second digital signals correspond respectively to this a plurality of first analog signals; An and synchronous module, be coupled to this time division multiple access modulation module and this time division multiple access demodulation module, in order to keep this time division multiple access modulation module and this time division multiple access demodulation module synchronously so that this time division multiple access demodulation module can distinguish correctly that digital signal samples in this second time division multiple access signal is for corresponding in these a plurality of first analog signals which.
The coder-decoder of utilization single simulation to digital transducer of the present invention, wherein this time division multiple access modulation module comprises: pulse width modulator, be coupled to this a plurality of input low pass filters,, produce a plurality of pulse waves of different length in order to amplitude according to these a plurality of first analog signals; And commutator, be coupled to this pulse width modulator, in a plurality of time slots in order to the correspondence of will these a plurality of pulse waves inserting a time-division multiple access frame respectively, to produce this first time division multiple access signal.
The coder-decoder of utilization single simulation to digital transducer of the present invention, wherein these a plurality of time slots length are impartial, and these a plurality of time slots correspond respectively to this a plurality of first analog signals.
The coder-decoder of utilization single simulation to digital transducer of the present invention, wherein this time division multiple access is separated mode transfer and is certainly comprised: the decommuntation device, be coupled to this analog-to-digital converter, export respectively in order to the numeral sample point that each this time slot comprised in this second time division multiple access signal with digital form, correspond respectively to a plurality of digital signals of these a plurality of first analog signals with generation; And pulse width demodulator, be coupled to this decommuntation device, be the pulsewidth demodulation of low frequency in order to carry out from high frequency conversion, to produce a plurality of first digital signals corresponding to these a plurality of first analog signals for these a plurality of digital signals.
The invention provides a kind of coder-decoder that uses single simulation to digital transducer, in order to handle a plurality of analog signals simultaneously, this coder-decoder comprises: a frequency division multiple access modulation module, in order to borrow a FDMA that a plurality of first analog signals are modulated to one first frequency division multiple address signal, this first frequency division multiple address signal can carry these a plurality of first analog signals simultaneously, one is coupled to the analog-to-digital converter of this frequency division multiple access modulation module, in order to this first frequency division multiple address signal of sampling to simulate conversion to numeral, and one second frequency division multiple address signal of generation digital form, one is coupled to the frequency division multiple access demodulation module of this analog-to-digital converter, be present in this FDMA of this second frequency division multiple address signal in order to demodulation, correspond respectively to a plurality of first digital signals of these a plurality of first analog signals with generation; A plurality of input low pass filters, be coupled to the input of this frequency division multiple access modulation module, in order to the high-frequency noise of a plurality of second analog signals of filtering, and produce these a plurality of first analog signals, when preventing that this analog-to-digital converter from sampling because of distorted signals that intersymbol interference was produced; A plurality of output low pass filters, be coupled to the output of this frequency division multiple access demodulation module, is high-frequency noise that low frequency process produced from high frequency conversion in order to these a plurality of first digital signals of filtering in this frequency division multiple access demodulation module, and producing a plurality of second digital signals, these a plurality of second digital signals correspond respectively to this a plurality of first analog signals; An and synchronous module, be coupled to this frequency division multiple access modulation module and this frequency division multiple access demodulation module, in order to keep this frequency division multiple access modulation module and this frequency division multiple access demodulation module synchronously so that this frequency division multiple access demodulation module can distinguish correctly that digital signal samples in this second frequency division multiple address signal is for corresponding in these a plurality of first analog signals which.
The coder-decoder of utilization single simulation to digital transducer of the present invention, more comprise a frequency synthesizer, be coupled to this frequency division multiple access modulation module and this frequency division multiple access demodulation module, in order to producing a plurality of carrier waves of different frequency, will this a plurality of first analog signals be stated from these a plurality of carrier waves of correspondence respectively on one of them for this frequency division multiple access modulation module.
The coder-decoder of utilization single simulation to digital transducer of the present invention, wherein this frequency division multiple access modulation module comprises: mixer, this first analog signal that is stated from these a plurality of carrier waves in order to mixing is single signal; And band pass filter, be coupled to this mixer, in order to eliminate the noise of this single signal, to produce this first frequency division multiple address signal.
The invention provides a kind of coder-decoder that uses single simulation to digital transducer, in order to handle a plurality of analog signals simultaneously, this coder-decoder comprises: a code division multiple access modulation module, in order to the code division multiple access mode of borrowing a plurality of first analog signals are modulated to one first CDMA signals, this first CDMA signals can be carried these a plurality of first analog signals simultaneously, one is coupled to the analog-to-digital converter of this code division multiple access modulation module, in order to this first CDMA signals of sampling to simulate conversion to numeral, and one second CDMA signals of generation digital form, one is coupled to the code division multiple access demodulation module of this analog-to-digital converter, be present in this code division multiple access mode of this second CDMA signals in order to demodulation, correspond respectively to a plurality of first digital signals of these a plurality of first analog signals with generation; A plurality of input low pass filters, be coupled to the input of this code division multiple access modulation module, in order to the high-frequency noise of a plurality of second analog signals of filtering, and produce these a plurality of first analog signals, when preventing that this analog-to-digital converter from sampling because of distorted signals that intersymbol interference was produced; A plurality of output low pass filters, be coupled to the output of this code division multiple access demodulation module, is high-frequency noise that low frequency process produced from high frequency conversion in order to these a plurality of first digital signals of filtering in this code division multiple access demodulation module, and producing a plurality of second digital signals, these a plurality of second digital signals correspond respectively to this a plurality of first analog signals; An and synchronous module, be coupled to this code division multiple access modulation module and this code division multiple access demodulation module, in order to keep this code division multiple access modulation module and this code division multiple access demodulation module synchronously so that this code division multiple access demodulation module can distinguish correctly that digital signal samples in this second CDMA signals is for corresponding in these a plurality of first analog signals which.
The coder-decoder of utilization single simulation to digital transducer of the present invention more comprises a decoding generator, is coupled to this code division multiple access modulation module and this code division multiple access demodulation module, corresponds respectively to the decoding of these a plurality of first analog signals in order to generation; And this code division multiple access modulation module just can be respectively compiles these a plurality of first analog signals respectively according to corresponding this a plurality of decodings, and is stated from after compiling and transmits on the carrier wave, to produce this first CDMA signals.
The present invention also provides a kind of single simulation to digital transducer that uses to handle the method for a plurality of signals simultaneously. and this method comprises the following steps: at first, use a plurality of input low pass filters, high-frequency noise with a plurality of first analog signals of filtering, and produce a plurality of second analog signals, to prevent in the sampling step distorted signals because of intersymbol interference was produced. then, borrow a multiple access mode a plurality of second analog signals to be modulated to one first multiple access signal, this first multiple access signal can carry these a plurality of second analog signals simultaneously. then, use an analog-to-digital converter to carry out this sampling step, with this first multiple access signal of sampling to simulate conversion to numeral, and one second multiple access signal of generation digital form. then, demodulation is present in this multiple access mode of this second multiple access signal, correspond respectively to a plurality of first digital signals of these a plurality of second analog signals with generation. then, use a plurality of output low pass filters, is high-frequency noise that low frequency process produced from high frequency conversion with these a plurality of first digital signals of filtering in this demodulation step, and produce a plurality of second digital signals, these a plurality of second digital signals correspond respectively to this a plurality of second analog signals. and keep these a plurality of second analog signals of modulation synchronous for the step of the step of this first multiple access signal and this multiple access mode that demodulation is present in this second multiple access signal, so that can distinguish correctly in this demodulation step that digital signal samples in this second multiple access signal is for corresponding in these a plurality of second analog signals which. wherein, when this multiple access mode is that a time-division is during multi-access mode, this first multiple access signal is one first time division multiple access signal, and this second multiple access signal is one second time division multiple access signal; When this multiple access mode was a FDMA, this first multiple access signal was one first frequency division multiple address signal, and this second multiple access signal is one second frequency division multiple address signal; When this multiple access mode was a code division multiple access mode, this first multiple access signal was one first CDMA signals, and this second multiple access signal is one second CDMA signals.
The coder-decoder of utilization single simulation to digital transducer of the present invention and signal processing method can reduce the production cost of coder-decoder.
Description of drawings
Fig. 1 is for using the time division multiple access method to carry out the simulating to the block diagram of the partial circuit of the coder-decoder of digital translation of many group signals simultaneously according to the present invention;
Fig. 2 is the schematic diagram of the time division multiple access signal among Fig. 1;
Fig. 3 is for using the frequency division multiple access method to carry out the simulating to the block diagram of the partial circuit of the coder-decoder of digital translation of many group signals simultaneously according to the present invention;
Fig. 4 is for using the code division multiple access method to carry out the simulating to the block diagram of the partial circuit of the coder-decoder of digital translation of many group signals simultaneously according to the present invention.
Embodiment
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, several preferred embodiments cited below particularly, and cooperate appended diagram, be described in detail below:
The present invention uses the multiple access technology to handle in the coder-decoder (Codec) of many group audio signals or vision signal in need, with the number of analog-to-digital converter required among the reduction Codec.Because at present the method for multiple access has three kinds of frequency division multiple accesss (FDMA), time division multiple access (TDMA), code division multiple access (CDMA), therefore the present invention also uses these three kinds of methods respectively among Codec, handle the target of many group audio signals or vision signal simultaneously to reach the utilization single simulation to digital transducer, occupy the Codec area of chip to reduce analog-to-digital converter, and and then reduce the production cost of Codec.
Fig. 1 is for using time division multiple access (TDMA) method to carry out the simulating to the block diagram of the coder-decoder partial circuit 100 of digital translation of many group signals simultaneously according to the present invention.The partial circuit 100 of coder-decoder receives many group input signals, is respectively input signal A
1To input signal A
N, these input signals are analog signal, and coder-decoder must all change these input signals into the form of digital signal, and to carry out follow-up decoding action.Input signal A
1To input signal A
NCan be simulated audio signal, for example the audio signal of multichannel; Can be analog video signal simultaneously also, for example three of the RGB form analog video signal inputs.
Input signal A
1To input signal A
NAt first respectively by input low pass filter (lowpass filter) 102A to 102N, with the high-frequency noise of these input signals of filtering.The HFS of input low pass filter 102A to 102N filtering input signal, can meet Shannon-nyquist sampling theorem (Shannon-Nyquist sampling theorem) so that input signal is follow-up when in analog-to-digital converter 106, sampling, to prevent intersymbol interference (inter-symbol interference, ISI) therefore the distorted signals that is produced can be described as anti-distortion filter (anti-alias filter) again.Input signal produces input signal A respectively by after importing low pass filter
1'～A
N', these input signals A
1'～A
N' all be transfused in the time division multiple access modulation module (TDMA modulator) 104.Time division multiple access modulation module 104 can time division multiple access mode, with input signal A
1' to input signal A
N' be modulated to divided into multi-address signal T for the moment
1
Figure 2 shows that time division multiple access signal T
1Schematic diagram, simply introduce the notion of time division multiple access with this.Suppose that total N group input signal must transmit via a time-division multiple address system, then time-division multiple address system can be cut into a period of time the N equal portions, be referred to as time slot (timeslot), and use indivedual time slots respectively to transmit to indivedual input signals that should time slot, therefore can on a communication channel, transmit N group input signal simultaneously.For example the tdma frame among Fig. 2 200 is cut into the time slot of N equal portions, corresponds respectively to input signal A
1'～A
N', wherein time slot 202 is in order to transmit input signal A
1', time slot 204 is in order to transmit input signal A
2', time slot 206 is in order to transmit input signal A
N-2', time slot 208 is in order to transmit input signal A
N-1', and time slot 210 is in order to transmit input signal A
N'.
Time division multiple access modulation module 104 comprises a commutator (commutator) 114 and a pulse width modulator (pulse width modulator) 124.Pulse width modulator 124 is in order to foundation input signal A
1'～A
N' amplitude, produce the pulse wave of different length.114 pairing input signal A of each time slot with TDMA of commutator
1'～A
N' pulse wave that produced by pulse width modulator 124 inserts respectively in each time slot, to produce time division multiple access signal T
1Time division multiple access signal T
1Then be transfused to analog-to-digital converter 106, analoging to the conversion of numeral, and produce the time division multiple access signal T of a digital form
2Wherein the sample frequency of analog-to-digital converter 106 be at least pulse width modulator 124 sample frequency N doubly, to reach the requirement of handling N input signal simultaneously.The time division multiple access signal T of digital form
2Then be transfused to time division multiple access demodulation module (TDMA demodulator) 108.Time division multiple access demodulation module 108 can be in the mode of demodulation time division multiple access, with divided into multi-address signal T in a period of time
2Be demodulated into N output signal D
1' to D
N'.
Time division multiple access demodulation module 108 comprises a decommuntation device (de-commutator) 118 and a pulse width demodulator (pulse widthdemodulator) 128.Decommuntation device 118 is with the time division multiple access signal T of digital form
2In numeral sample point that each time slot comprised export respectively, to produce corresponding to input signal A
1'～A
N' N digital signal.It is the pulsewidth demodulation of low frequency that 128 of pulse width demodulator are carried out from high frequency conversion this N digital signal, to produce corresponding to input signal A
1'～A
N' N output signal D
1' to D
N'.
Output signal D
1' to D
N' then respectively by output low pass filter (low passfilter) 110A to 110N, be the high-frequency noise that is produced in the low frequency process from high frequency conversion with these output signals of filtering.Therefore export low pass filter 110A to 110N and can be described as integral multiple degradation sampling filter (decimation filter) again, or reconstruction filter (reconstruction filter).Output signal D
1' to D
N' by behind the output low pass filter 110A to 110N, produce respectively corresponding to analog input signal A
1～A
NN digital output signal D
1～D
N
In addition, must be noted that commutator 114 and decommuntation device 118 must keep (synchronized) synchronously, so that decommuntation device 118 can be with the time division multiple access signal T of digital form
2In corresponding to input signal A
1'～A
N' the numeral sample point that time slot comprised correctly be output as corresponding to input signal A
1'～A
N' N digital signal, in case decommuntation device 118 mistake is with the time division multiple access signal T of digital form
2In belong to Ax ' sample of signal separate to corresponding to A
Y' output signal. this synchronous working can be independent of time division multiple access modulation module 104 by one and carry out with synchronization module beyond the time division multiple access demodulation module 108. in addition, pulse width modulator 124 also must be kept synchronously with pulse width demodulator 128, so that N the digital signal that 128 pairs of decommuntation devices of pulse width demodulator 118 are exported carried out the pulsewidth demodulation corresponding with pulse width modulator 124.
Fig. 3 is for using frequency division multiple access (FDMA) method to carry out the simulating to the block diagram of the coder-decoder partial circuit 300 of digital translation of many group signals simultaneously according to the present invention.The partial circuit 300 of coder-decoder receives many group input signals, is respectively input signal A
1To input signal A
N, these input signals are analog signal, and coder-decoder must all change these input signals into the form of digital signal, and to carry out follow-up decoding action.Input signal A
1To input signal A
NCan be simulated audio signal, for example the audio signal of multichannel; Can be analog video signal simultaneously also, for example three of the RGB form analog video signal inputs.
Input signal A
1To input signal A
NAt first respectively by input low pass filter 302A to 302N, with the high-frequency noise of these input signals of filtering.The HFS of input low pass filter 302A to 302N filtering input signal, can meet Shannon-nyquist sampling theorem so that input signal is follow-up when in analog-to-digital converter 306, sampling, with the distorted signals that prevents that intersymbol interference from being produced, therefore can be described as anti-distortion filter again.Input signal produces input signal A respectively by after importing low pass filter
1'～A
N', these input signals A
1'～A
N' all be transfused in the frequency division multiple access modulation module (FDMAmodulator) 304.Frequency division multiple access modulation module 304 can frequency division multiple access mode, with input signal A
1' to input signal A
N' be modulated to a frequency division multiple address signal F
1
At first simply introduce the notion of frequency division multiple access at this.Suppose that total N group input signal must transmit via a fdma system, then therefore the fdma system carrier wave (carrier) that can use different frequency respectively can transmit N group input signal simultaneously to transmit indivedual input signals that should carrier wave on a communication channel.In Fig. 3, at first produce the carrier wave of N group different frequency by frequency synthesizer (frequency synthesizer) 312.Then, frequency division multiple access modulation module 304 just can be respectively with input signal A
1'～A
N' be stated from the N group carrier wave of frequency synthesizer 312 generations.Frequency division multiple access modulation module 304 still comprises a mixer (mixer) and a band pass filter (band pass filter).This mixer is single signal in order to the input signal that mixing is stated from the N group carrier wave, mixed signal then by band pass filter to eliminate noise, finally produce a frequency division multiple address signal F
1
Frequency division multiple address signal F
1Then be transfused to analog-to-digital converter 306, analoging to the conversion of numeral, and produce the frequency division multiple address signal F of a digital form
2The frequency division multiple address signal F of digital form
2Then be transfused to frequency division multiple access demodulation module (FDMAdemodulator) 308.Frequency division multiple access demodulation module 308 can be according to the carrier frequency of frequency synthesizer 312 generations corresponding to each signal, the frequency division multiple address signal F of demodulation digital form
2On frequency division multiple access, to produce corresponding to input signal A
1'～A
N' N output signal D
1' to D
N'.
Output signal D
1' to D
N' then respectively by output low pass filter 310A to 310N, in frequency division multiple access demodulation module 308, be the high-frequency noise that is produced in the low frequency process from high frequency conversion with these output signals of filtering.Therefore export low pass filter 310A to 310N and can be described as integral multiple degradation sampling filter again, or reconstruction filter.Output signal D
1' to D
N' by behind the output low pass filter 310A to 310N, produce respectively corresponding to analog input signal A
1～A
NN digital output signal D
1～D
N
In addition, must be noted that frequency division multiple access modulation module 304 and frequency division multiple access demodulation module 308 also must keep synchronously, in case frequency division multiple access demodulation module 308 mistakes are with the frequency division multiple address signal F of digital form
2In belong to Ax ' sample of signal separate to corresponding to A
Y' output signal.This synchronous working can be independent of frequency division multiple access modulation module 304 by one and carry out with frequency division multiple access demodulation module 308 synchronization module in addition.
Fig. 4 is for using code division multiple access (CDMA) method to carry out the simulating to the block diagram of the coder-decoder partial circuit 400 of digital translation of many group signals simultaneously according to the present invention. and the partial circuit 400 of coder-decoder receives many group input signals, is respectively input signal A
1To input signal A
N, these input signals are analog signal, and coder-decoder must all change these input signals into the form of digital signal, and to carry out follow-up decoding action.Input signal A
1To input signal A
NCan be simulated audio signal, for example the audio signal of multichannel; Can be analog video signal simultaneously also, for example three of the RGB form analog video signal inputs.
Input signal A
1To input signal A
NAt first respectively by input low pass filter 402A to 402N, with the high-frequency noise of these input signals of filtering.The HFS of input low pass filter 402A to 402N filtering input signal, can meet Shannon-nyquist sampling theorem so that input signal is follow-up when in analog-to-digital converter 406, sampling, with the distorted signals that prevents that intersymbol interference from being produced, therefore can be described as anti-distortion filter again.Input signal produces input signal A respectively by after importing low pass filter
1'～A
N', these input signals A
1'～A
N' all be transfused in the code division multiple access modulation module (CDMAmodulator) 404.Code division multiple access modulation module 404 can code division multiple access mode, with input signal A
1' to input signal A
N' be modulated to a CDMA signals C
1
At first simply introduce the notion of code division multiple access at this.Suppose that total N group input signal must transmit via a code division multiple access system, then code division multiple access system can use different decoding (code) that signal is compiled respectively, transmit N input signal after the compiling simultaneously with same carrier frequency then, therefore can on a communication channel, transmit N group input signal simultaneously.After the destination receives signal, use different decoding with the signal decipher more respectively, to be reduced to N group signal.In Fig. 4, at first produce the different decoding of N group by decoding generator (orthogonal codegenerator) 412.Then, code division multiple access modulation module 404 just can be respectively with input signal A
1'～A
N' the N group decoding that produced according to decoding generator 412 respectively compiles.Code division multiple access modulation module 404 just can be stated from the decoding after the compiling on the same carrier wave to be transmitted, and finally produces a CDMA signals C
1
CDMA signals C
1Then be transfused to analog-to-digital converter 406, analoging to the conversion of numeral, and produce the CDMA signals C of a digital form
2The CDMA signals C of digital form
2Then be transfused to code division multiple access demodulation module (CDMAdemodulator) 408.Code division multiple access demodulation module 408 can be according to the decoding of decoding generator 412 generations corresponding to each signal, the CDMA signals C of demodulation digital form
2On code division multiple access, to produce corresponding to input signal A
1'～A
N' N output signal D
1' to D
N'.
Output signal D
1' to D
N' then respectively by output low pass filter 410A to 410N, in code division multiple access demodulation module 408, be the high-frequency noise that is produced in the low frequency process from high frequency conversion with these output signals of filtering.Therefore export low pass filter 410A to 410N and can be described as integral multiple degradation sampling filter again, or reconstruction filter.Output signal D
1' to D
N' by behind the output low pass filter 410A to 410N, produce respectively corresponding to analog input signal A
1～A
NN digital output signal D
1～D
N
In addition, must be noted that code division multiple access modulation module 404 and code division multiple access demodulation module 408 also must keep synchronously, in case code division multiple access demodulation module 408 mistakes are with the CDMA signals C of digital form
2In belong to Ax ' sample of signal separate to corresponding to A
Y' output signal.This synchronous working can be independent of code division multiple access modulation module 404 by one and carry out with code division multiple access demodulation module 408 synchronization module in addition.
The present invention handles utilization multiple access technology in the coder-decoder of organizing audio signals or vision signal in need more, number with analog-to-digital converter required in the reduction coder-decoder. the present invention uses frequency division multiple access (FDMA) respectively in number embodiment, time division multiple access (TDMA), code division multiple access three kinds of methods such as (CDMA) are among coder-decoder, to reach the utilization single simulation to digital transducer to handle the target of many group audio signals or vision signal simultaneously. so can reduce analog-to-digital converter and occupy the coder-decoder area of chip, and and then reduce the production cost of coder-decoder. in addition, utilization multiple access technology is in the coder-decoder of handling vision signal, because the modulation module and the demodulation module of multiple access must be reached synchronously, therefore simultaneously treated many group vision signals also can keep synchronously, and eliminate because of distortions such as asynchronous ghost that causes picture or ripples.
The above only is preferred embodiment of the present invention; so it is not in order to limit scope of the present invention; any personnel that are familiar with this technology; without departing from the spirit and scope of the present invention; can do further improvement and variation on this basis, so the scope that claims were defined that protection scope of the present invention is worked as with the application is as the criterion.
Being simply described as follows of symbol in the accompanying drawing:
102A-102N, 302A-302N, 402A-402N: input low pass filter
104: the time division multiple acess modulation module
108: the time division multiple acess demodulation module
304: the frequency division multiple access modulation module
308: the frequency division multiple access demodulation module
404: the code division multiple access modulation module
408: the code division multiple access demodulation module
106,306,406: analog-to-digital converter
110A-110N, 310A-310N, 410A-410N: output low pass filter
114: commutator
118: the decommuntation device
124: pulse width modulator
128: pulse width demodulator
312: frequency synthesizer
412: the decoding generator.
Claims (10)
1. a coder-decoder that uses single simulation to digital transducer is characterized in that, in order to handle a plurality of analog signals simultaneously, the coder-decoder of described utilization single simulation to digital transducer comprises:
The time division multiple access modulation module is modulated to one first time division multiple access signal in order to borrow a time-division multi-access mode with a plurality of first analog signals, and this first time division multiple access signal can carry this a plurality of first analog signals simultaneously;
Analog-to-digital converter is coupled to this time division multiple access modulation module, simulating the conversion to numeral, and produces one second time division multiple access signal of digital form in order to this first time division multiple access signal of sampling;
The time division multiple access demodulation module is coupled to this analog-to-digital converter, is present in this time division multiple access way of this second time division multiple access signal in order to demodulation, corresponds respectively to a plurality of first digital signals of these a plurality of first analog signals with generation;
A plurality of input low pass filters, be coupled to the input of this time division multiple access modulation module, in order to the high-frequency noise of a plurality of second analog signals of filtering, and produce these a plurality of first analog signals, when preventing that this analog-to-digital converter from sampling because of distorted signals that intersymbol interference was produced;
A plurality of output low pass filters, be coupled to the output of this time division multiple access demodulation module, is high-frequency noise that low frequency process produced from high frequency conversion in order to these a plurality of first digital signals of filtering in this time division multiple access demodulation module, and producing a plurality of second digital signals, these a plurality of second digital signals correspond respectively to this a plurality of first analog signals; And
One synchronous module, be coupled to this time division multiple access modulation module and this time division multiple access demodulation module, in order to keep this time division multiple access modulation module and this time division multiple access demodulation module synchronously so that this time division multiple access demodulation module can distinguish correctly that digital signal samples in this second time division multiple access signal is for corresponding in these a plurality of first analog signals which.
2. the coder-decoder of utilization single simulation to digital transducer according to claim 1 is characterized in that, this time division multiple access modulation module comprises:
Pulse width modulator is coupled to this a plurality of input low pass filters, in order to the amplitude according to these a plurality of first analog signals, produces a plurality of pulse waves of different length; And
Commutator is coupled to this pulse width modulator, in a plurality of time slots in order to the correspondence of will these a plurality of pulse waves inserting a time-division multiple access frame respectively, to produce this first time division multiple access signal.
3. the coder-decoder of utilization single simulation to digital transducer according to claim 2 is characterized in that, these a plurality of time slots length are impartial, and these a plurality of time slots correspond respectively to this a plurality of first analog signals.
4. the coder-decoder of utilization single simulation to digital transducer according to claim 2 is characterized in that, this time division multiple access demodulation module comprises:
The decommuntation device is coupled to this analog-to-digital converter, exports respectively in order to the numeral sample point that each this time slot comprised in this second time division multiple access signal with digital form, corresponds respectively to a plurality of digital signals of these a plurality of first analog signals with generation; And
Pulse width demodulator is coupled to this decommuntation device, is the pulsewidth demodulation of low frequency in order to carry out from high frequency conversion for these a plurality of digital signals, to produce a plurality of first digital signals corresponding to these a plurality of first analog signals.
5. a coder-decoder that uses single simulation to digital transducer is characterized in that, in order to handle a plurality of analog signals simultaneously, the coder-decoder of described utilization single simulation to digital transducer comprises:
The frequency division multiple access modulation module is modulated to one first frequency division multiple address signal in order to borrow a FDMA with a plurality of first analog signals, and this first frequency division multiple address signal can carry this a plurality of first analog signals simultaneously;
Analog-to-digital converter is coupled to this frequency division multiple access modulation module, simulating the conversion to numeral, and produces one second frequency division multiple address signal of digital form in order to this first frequency division multiple address signal of sampling;
The frequency division multiple access demodulation module is coupled to this analog-to-digital converter, is present in this FDMA of this second frequency division multiple address signal in order to demodulation, corresponds respectively to a plurality of first digital signals of these a plurality of first analog signals with generation;
A plurality of input low pass filters, be coupled to the input of this frequency division multiple access modulation module, in order to the high-frequency noise of a plurality of second analog signals of filtering, and produce these a plurality of first analog signals, when preventing that this analog-to-digital converter from sampling because of distorted signals that intersymbol interference was produced;
A plurality of output low pass filters, be coupled to the output of this frequency division multiple access demodulation module, is high-frequency noise that low frequency process produced from high frequency conversion in order to these a plurality of first digital signals of filtering in this frequency division multiple access demodulation module, and producing a plurality of second digital signals, these a plurality of second digital signals correspond respectively to this a plurality of first analog signals; And
One synchronous module, be coupled to this frequency division multiple access modulation module and this frequency division multiple access demodulation module, in order to keep this frequency division multiple access modulation module and this frequency division multiple access demodulation module synchronously so that this frequency division multiple access demodulation module can distinguish correctly that digital signal samples in this second frequency division multiple address signal is for corresponding in these a plurality of first analog signals which.
6. the coder-decoder of utilization single simulation to digital transducer according to claim 5, it is characterized in that, more comprise a frequency synthesizer, be coupled to this frequency division multiple access modulation module and this frequency division multiple access demodulation module, in order to producing a plurality of carrier waves of different frequency, will this a plurality of first analog signals be stated from these a plurality of carrier waves of correspondence respectively on one of them for this frequency division multiple access modulation module.
7. the coder-decoder of utilization single simulation to digital transducer according to claim 6 is characterized in that, this frequency division multiple access modulation module comprises:
Mixer, this first analog signal that is stated from these a plurality of carrier waves in order to mixing is single signal; And
Band pass filter is coupled to this mixer, in order to eliminate the noise of this single signal, to produce this first frequency division multiple address signal.
8. a coder-decoder that uses single simulation to digital transducer is characterized in that, in order to handle a plurality of analog signals simultaneously, the coder-decoder of described utilization single simulation to digital transducer comprises:
The code division multiple access modulation module is modulated to one first CDMA signals in order to borrow a code division multiple access mode with a plurality of first analog signals, and this first CDMA signals can be carried this a plurality of first analog signals simultaneously;
Analog-to-digital converter is coupled to this code division multiple access modulation module, simulating the conversion to numeral, and produces one second CDMA signals of digital form in order to this first CDMA signals of sampling;
The code division multiple access demodulation module is coupled to this analog-to-digital converter, is present in this code division multiple access mode of this second CDMA signals in order to demodulation, corresponds respectively to a plurality of first digital signals of these a plurality of first analog signals with generation;
A plurality of input low pass filters, be coupled to the input of this code division multiple access modulation module, in order to the high-frequency noise of a plurality of second analog signals of filtering, and produce these a plurality of first analog signals, when preventing that this analog-to-digital converter from sampling because of distorted signals that intersymbol interference was produced;
A plurality of output low pass filters, be coupled to the output of this code division multiple access demodulation module, is high-frequency noise that low frequency process produced from high frequency conversion in order to these a plurality of first digital signals of filtering in this code division multiple access demodulation module, and producing a plurality of second digital signals, these a plurality of second digital signals correspond respectively to this a plurality of first analog signals; And
One synchronous module, be coupled to this code division multiple access modulation module and this code division multiple access demodulation module, in order to keep this code division multiple access modulation module and this code division multiple access demodulation module synchronously so that this code division multiple access demodulation module can distinguish correctly that digital signal samples in this second CDMA signals is for corresponding in these a plurality of first analog signals which.
9. the coder-decoder of utilization single simulation to digital transducer according to claim 8, it is characterized in that, more comprise a decoding generator, be coupled to this code division multiple access modulation module and this code division multiple access demodulation module, correspond respectively to the decoding of these a plurality of first analog signals in order to generation; And this code division multiple access modulation module just can be respectively compiles these a plurality of first analog signals respectively according to corresponding this a plurality of decodings, and is stated from after compiling and transmits on the carrier wave, to produce this first CDMA signals.
10. one kind is used single simulation to digital transducer to handle the method for a plurality of signals simultaneously, it is characterized in that, described utilization single simulation to digital transducer comprises the following steps: with the method for handling a plurality of signals simultaneously
Use a plurality of input low pass filters,, and produce a plurality of second analog signals, to prevent in the sampling step distorted signals because of intersymbol interference was produced with the high-frequency noise of a plurality of first analog signals of filtering;
Borrow a multiple access mode a plurality of second analog signals to be modulated to one first multiple access signal, this first multiple access signal can carry this a plurality of second analog signals simultaneously;
Use an analog-to-digital converter to carry out this sampling step, simulating conversion, and produce one second multiple access signal of digital form to numeral with this first multiple access signal of sampling;
Demodulation is present in this multiple access mode of this second multiple access signal, corresponds respectively to a plurality of first digital signals of these a plurality of second analog signals with generation;
Use a plurality of output low pass filters, is high-frequency noise that low frequency process produced from high frequency conversion with these a plurality of first digital signals of filtering in this demodulation step, and producing a plurality of second digital signals, these a plurality of second digital signals correspond respectively to this a plurality of second analog signals; And
Keep these a plurality of second analog signals of modulation for the step of the step of this first multiple access signal and this multiple access mode that demodulation is present in this second multiple access signal synchronously be corresponding in these a plurality of second analog signals which so that can correctly distinguish digital signal samples in this second multiple access signal in this demodulation step;
Wherein, when this multiple access mode is time-division during multi-access mode, this first multiple access signal is one first time division multiple access signal, and this second multiple access signal is one second time division multiple access signal;
When this multiple access mode was a FDMA, this first multiple access signal was one first frequency division multiple address signal, and this second multiple access signal is one second frequency division multiple address signal;
When this multiple access mode was a code division multiple access mode, this first multiple access signal was one first CDMA signals, and this second multiple access signal is one second CDMA signals.
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| CN1198626A (en) * | 1997-04-30 | 1998-11-11 | 松下电器产业株式会社 | CDMA receiver |
| JP2004096263A (en) * | 2002-08-30 | 2004-03-25 | Anritsu Corp | Modulation signal analysis apparatus and reception module evaluation system |
| EP1422900A1 (en) * | 2001-08-31 | 2004-05-26 | Fujitsu Limited | Receiver and receiving method for cdma communication system |
| CN1559127A (en) * | 2001-10-10 | 2004-12-29 | ����ɭ�绰�ɷ�����˾ | Receiver with adaptive detection threshold for TDMA communication |
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| CN1198626A (en) * | 1997-04-30 | 1998-11-11 | 松下电器产业株式会社 | CDMA receiver |
| EP1422900A1 (en) * | 2001-08-31 | 2004-05-26 | Fujitsu Limited | Receiver and receiving method for cdma communication system |
| CN1559127A (en) * | 2001-10-10 | 2004-12-29 | ����ɭ�绰�ɷ�����˾ | Receiver with adaptive detection threshold for TDMA communication |
| JP2004096263A (en) * | 2002-08-30 | 2004-03-25 | Anritsu Corp | Modulation signal analysis apparatus and reception module evaluation system |
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