CN100502263C - Digital radio Mondeal/AM simulcast - Google Patents

Digital radio Mondeal/AM simulcast Download PDF

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CN100502263C
CN100502263C CNB038257769A CN03825776A CN100502263C CN 100502263 C CN100502263 C CN 100502263C CN B038257769 A CNB038257769 A CN B038257769A CN 03825776 A CN03825776 A CN 03825776A CN 100502263 C CN100502263 C CN 100502263C
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sideband
transmission signal
correction
correction signal
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CN1732641A (en
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J·维尔德哈根
D·施尔
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Sony Deutschland GmbH
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
    • H04H20/33—Arrangements for simultaneous broadcast of plural pieces of information by plural channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/20—Arrangements for broadcast or distribution of identical information via plural systems
    • H04H20/22—Arrangements for broadcast of identical information via plural broadcast systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
    • H04H20/36—Arrangements for simultaneous broadcast of plural pieces of information for AM broadcasts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/18—Aspects of broadcast communication characterised by the type of broadcast system in band on channel [IBOC]
    • H04H2201/186—AM digital or hybrid
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/20—Aspects of broadcast communication characterised by the type of broadcast system digital audio broadcasting [DAB]

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
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  • Circuits Of Receivers In General (AREA)

Abstract

An AM simulcast broadcast signal combining a digital transmission signal and an analogue transmission signal in one transmission channel. The digital transmission signal is modulated to one sideband of a carrier of the transmission channel and a correcting signal (C) is modulated to the other sideband of the carrier of the transmission channel, which correcting signal (C) is determined so that the envelope demodulation of the transmission channel represents the analogue transmission signal.

Description

数字无线电Mondeal/调幅联播 Digital radio Mondeal/AM simulcast

技术领域 technical field

本发明涉及将数字传输信号和模拟传输信号组合在一个传输信道中的调幅(AM)联播信号、传输这种信号的方法、以及实现这种方法的AM联播信号发生器。The present invention relates to an amplitude modulated (AM) simulcast signal combining a digital transmission signal and an analog transmission signal in one transmission channel, a method of transmitting such a signal, and an AM simulcast signal generator implementing the method.

背景技术 Background technique

DRM(数字无线电Mondeal)是在30MHz以下的广播波段中的一种数字业务。传统模拟业务和新数字业务的同时传输将简化和加速DRM系统的引入，因为在引入DRM时不会失去模拟业务的听众。DRM (Digital Radio Mondeal) is a digital service in the broadcast band below 30 MHz. Simultaneous transmission of traditional analog services and new digital services will simplify and speed up the introduction of DRM systems, because the audience of analog services will not be lost when DRM is introduced.

从本质上说，联播技术已知可用于AM波段。第一个已知的可能性是利用半信道模拟DSB(双边带调制)，以及半信道数字DSB。其缺点是：模拟信号的声频带宽减少了50％；存在从数字半信道到模拟半信道的道间串扰；以及现有的模拟接收机不使用现代技术而使用标准滤波器，成为具有失真的接收机。第二个已知的可能性是IBOC(带内信道)系统，其中将数字信号调制成与未改变的模拟信号正交。其缺点：数字接收机中所要求的动态范围显著增加；存在从模拟信号到数字信号以及从数字信号到模拟信号的串音；以及数字和模拟系统都成为具有失真的系统。Essentially, simulcast technology is known to work on the AM band. A first known possibility is to use half-channel analog DSB (double sideband modulation), as well as half-channel digital DSB. Its disadvantages are: the audio frequency bandwidth of the analog signal is reduced by 50%; there is inter-channel crosstalk from digital half-channel to analog half-channel; and existing analog receivers do not use modern technology but use standard filters, which become distorted reception machine. A second known possibility is the IBOC (In-Band Channel) system, where the digital signal is modulated in quadrature with the unchanged analog signal. Its disadvantages: the required dynamic range in digital receivers increases significantly; there is crosstalk from analog to digital and vice versa; and both digital and analog systems become systems with distortion.

发明内容 Contents of the invention

所以，本发明的目的是定义一种新的方法，用于在同一信道中联播数字和模拟传输信号。Therefore, the object of the present invention is to define a new method for simulcasting digital and analogue transmission signals in the same channel.

根据本发明的实施例，所述目的是通过将数字传输信号和模拟传输信号组合在一个传输信道中的AM联播信号来实现的。另外，在本发明的实施例中，提供了产生这种实现所述目的的AM联播信号的方法。此外，在本发明的实施例中，提供了实现所述目的的AM联播信号发生器。在本发明的实施例中，提供了实现所述目的的计算机程序产品。在本发明的实施例中，还提供了所述广播信号、产生所述广播信号的方法、以及合适的广播发生器。According to an embodiment of the invention, said object is achieved by an AM simulcast signal combining a digital transmission signal and an analogue transmission signal in one transmission channel. Additionally, in an embodiment of the present invention, a method of generating such an AM simulcast signal to achieve the stated object is provided. Furthermore, in an embodiment of the present invention, there is provided an AM simulcast signal generator which achieves the stated object. In an embodiment of the invention, a computer program product is provided to achieve the stated objects. In an embodiment of the present invention, the broadcast signal, a method for generating the broadcast signal, and a suitable broadcast generator are also provided.

这样建立按照本发明的将数字传输信号和模拟传输信号组合在一个传输信道中的AM联播信号，使得数字传输信号被调制到传输信道载波的一个边带，并且校正信号被调制到传输信道载波的另一个边带，以这样的方式确定所述校正信号，即，所述传输信道的包络解调代表所述模拟传输信号。An AM simulcast signal according to the invention combining a digital transmission signal and an analog transmission signal in one transmission channel is created such that the digital transmission signal is modulated to a sideband of the transmission channel carrier and the correction signal is modulated to a sideband of the transmission channel carrier. Another sideband, said correction signal is determined in such a way that the envelope demodulation of said transmission channel is representative of said analog transmission signal.

按照本发明的这种AM联播信号允许用未改变的声频带宽接收模拟信号，同时将数字信号引入到同一频率时隙。模拟信号继续可以用简单的包络检波器接收。而且，不存在从模拟信号到数字信号的串音，而从数字信号到模拟信号的串音失真仅存在于具有质量低、非对称、IF(中频)滤波器特性的AM接收机中。而且，与现有的AM系统完全兼容，并可以确保5kHz的全部声频带宽。Such an AM simulcast signal according to the present invention allows analog signals to be received with an unchanged audio frequency bandwidth, while digital signals are introduced into the same frequency time slot. The analog signal continues to be received with a simple envelope detector. Also, there is no crosstalk from analog to digital, which distortion exists only in AM receivers with low quality, asymmetric, IF (intermediate frequency) filter characteristics. Moreover, it is fully compatible with existing AM systems and ensures a full audio bandwidth of 5kHz.

此外，在按照本发明的AM联播信号中，所述校正信号最好以迭代过程产生，按照所述过程：Furthermore, in the AM simulcast signal according to the invention, said correction signal is preferably generated in an iterative process according to which:

-将所述数字传输信号调制到所述一个边带；- modulating said digital transmission signal to said one sideband;

-将所述模拟传输信号调制到所述另一个边带；- modulating said analog transmission signal to said other sideband;

-将所述两个边带相加并且在所述两个边带的中心将所述载波信号相加；- adding said two sidebands and adding said carrier signal at the center of said two sidebands;

-对这样产生的联播信号进行包络解调；- Envelope demodulation of the simulcast signal thus generated;

-通过从模拟传输信号中减去包络解调后的联播信号来产生误差信号，所述模拟传输信号根据产生和解调联播信号的处理时间被延迟；- generating the error signal by subtracting the envelope-demodulated simulcast signal from the analog transmission signal delayed according to the processing time for generating and demodulating the simulcast signal;

-利用时变或非时变变量加权误差信号；- weighting the error signal with a time-varying or time-invariant variable;

-通过将加权的误差信号加到延迟的模拟传输信号上来产生新的模拟传输信号，- generating a new analog transmission signal by adding a weighted error signal to the delayed analog transmission signal,

-与模拟传输信号的延迟相应地延迟所述数字信号，- delaying said digital signal corresponding to the delay of the analog transmission signal,

其中利用另一时变或非时变变量并利用新产生的模拟传输信号作为所述模拟传输信号将整个过程重复N次，其中N是包括零的正整数，是根据在第N次迭代后被确定为新产生的模拟传输信号的校正信号的所需精度而确定的。Wherein the whole process is repeated N times using another time-varying or non-time-varying variable and using a newly generated analog transmission signal as said analog transmission signal, wherein N is a positive integer including zero and is determined according to Determined for the required accuracy of the correction signal for the newly generated analog transmission signal.

按照本发明的将数字传输信号和模拟传输信号组合在一个传输信道中的AM联播信号的产生方法包括以下步骤：将数字传输信号调制到传输信道载波的一个边带；以及将校正信号调制到传输信道载波的另一个边带，这样确定所述校正信号，使得传输信道的包络解调代表模拟传输信号。A method for generating an AM simulcast signal combining a digital transmission signal and an analog transmission signal in one transmission channel according to the present invention comprises the steps of: modulating the digital transmission signal to a sideband of the transmission channel carrier; and modulating the correction signal to the transmission channel Another sideband of the channel carrier, the correction signal is determined such that the demodulated envelope of the transmission channel represents an analog transmission signal.

此外，在按照本发明的方法中，产生所述校正信号的步骤最好以迭代过程进行，所述迭代过程包括以下步骤：Furthermore, in the method according to the invention, the step of generating said correction signal is preferably carried out in an iterative process, said iterative process comprising the steps of:

-将所述数字传输信号调制到所述一个边带；- modulating said digital transmission signal to said one sideband;

-将所述模拟传输信号调制到所述另一个边带；- modulating said analog transmission signal to said other sideband;

-将所述两个边带和所述两个边带中心的所述载波信号相加；- adding said two sidebands and said carrier signal at the center of said two sidebands;

-对这样产生的联播信号进行包络解调；- Envelope demodulation of the simulcast signal thus generated;

-通过从模拟传输信号中减去包络解调后的联播信号来产生误差信号，所述模拟传输信号根据产生和解调联播信号的处理时间被延迟；- generating the error signal by subtracting the envelope-demodulated simulcast signal from the analog transmission signal delayed according to the processing time for generating and demodulating the simulcast signal;

-利用时变或非时变变量加权误差信号；- weighting the error signal with a time-varying or time-invariant variable;

-通过将加权的误差信号加到延迟的模拟传输信号上来产生新的模拟传输信号；- generating a new analog transmission signal by adding a weighted error signal to the delayed analog transmission signal;

-与模拟传输信号的延迟相应地延迟数字信号，- delaying the digital signal corresponding to the delay of the analog transmission signal,

其中利用另一时变或非时变变量并利用新产生的模拟传输信号作为所述模拟传输信号将整个过程重复N次，其中N是包括零的正整数，是根据在第N次迭代后被确定为新产生的模拟传输信号的校正信号的所需精度而确定的。Wherein the whole process is repeated N times using another time-varying or non-time-varying variable and using a newly generated analog transmission signal as said analog transmission signal, wherein N is a positive integer including zero and is determined according to Determined for the required accuracy of the correction signal for the newly generated analog transmission signal.

因此，按照本发明，校正信号最好在迭代过程中产生，其中最终的校正信号是根据用假定或中间校正信号所产生的联播信号重新计算的模拟传输信号和应实际传输的模拟传输信号之间的误差信号来确定的。Therefore, according to the present invention, the correction signal is preferably generated in an iterative process, wherein the final correction signal is based on the difference between the analog transmission signal recalculated using the simulcast signal generated by the assumed or intermediate correction signal and the analog transmission signal that should actually be transmitted. The error signal is determined.

按照本发明的用于在一个传输信道中传输数字传输信号和模拟传输信号的AM联播信号发生器包括：第一调制器，用以将数字传输信号调制到传输信道载波的一个边带；以及第二调制器，用以将校正信号调制到传输信道载波的另一个边带，这样确定所述校正信号，使得传输信道的包络解调代表模拟传输信号。The AM simulcast signal generator for transmitting a digital transmission signal and an analog transmission signal in a transmission channel according to the present invention includes: a first modulator for modulating the digital transmission signal to a sideband of the transmission channel carrier; and A modulator for modulating a correction signal onto the other sideband of the carrier of the transmission channel, said correction signal being determined such that the envelope demodulation of the transmission channel represents the analog transmission signal.

按照本发明的广播信号发生器最好还包括第一加法器，用以将所述两个边带和所述两个边带中心的载波信号相加。Preferably, the broadcast signal generator according to the present invention further includes a first adder for adding said two sidebands and carrier signals at centers of said two sidebands.

按照本发明的广播信号发生器最好还包括校正信号发生器，所述校正信号发生器包括：Preferably, the broadcast signal generator according to the present invention further includes a correction signal generator comprising:

-第三调制器，它将所述数字传输信号调制到所述一个边带；- a third modulator which modulates said digital transmission signal to said one sideband;

-第四调制器，它将所述模拟传输信号调制到所述另一个边带；- a fourth modulator which modulates said analog transmission signal to said other sideband;

-第二加法器，它将所述两个边带相加；- a second adder which adds the two sidebands;

-第一包络解调器，它对这样产生的联播信号进行包络解调；- a first envelope demodulator which performs envelope demodulation of the simulcast signal thus generated;

-第一延迟元件，它根据产生和解调相应的联播信号的处理时间延迟模拟传输信号；- a first delay element which delays the analog transmission signal according to the processing time for generating and demodulating the corresponding simulcast signal;

-第一减法器，它从延迟的模拟传输信号中减去包络解调后的联播信号，产生误差信号；- a first subtractor, which subtracts the envelope-demodulated simulcast signal from the delayed analog transmission signal, producing an error signal;

-第一乘法器，它利用时变和非时变变量加权误差信号；- a first multiplier which weights the error signal with time-varying and time-invariant variables;

-第三加法器，它通过将加权的误差信号加到延迟的模拟传输信号上来产生校正信号或中间校正信号；- a third adder which generates a correction signal or an intermediate correction signal by adding the weighted error signal to the delayed analog transmission signal;

-第二延迟元件，它根据产生和解调相应的联播信号的处理时间延迟数字传输信号。- A second delay element which delays the digital transmission signal according to the processing time for generating and demodulating the corresponding simulcast signal.

按照本发明的广播信号发生器中的所述校正信号发生器最好还包括N个校正信号单元，所述校正信号单元分别包括：The correction signal generator in the broadcast signal generator according to the present invention preferably further includes N correction signal units, and the correction signal units respectively include:

-第五调制器，它将所述中间校正信号调制到一个边带；- a fifth modulator, which modulates said intermediate correction signal to a sideband;

-第四加法器，它将所述两个边带相加；- a fourth adder which adds the two sidebands;

-第二包络解调器，它对这样产生的联播信号进行包络解调，- a second envelope demodulator which envelope-demodulates the simulcast signal thus generated,

-第三延迟元件，它根据产生和解调相应的联播信号的处理时间延迟中间校正信号；- a third delay element which delays the intermediate correction signal according to the processing time for generating and demodulating the corresponding simulcast signal;

-第二减法器，它从延迟的中间校正信号中减去包络解调后的联播信号，产生误差信号；- a second subtractor, which subtracts the envelope-demodulated simulcast signal from the delayed intermediate corrected signal, producing an error signal;

-第二乘法器，它利用时变和非时变变量加权误差信号；- a second multiplier which weights the error signal with time-varying and time-invariant variables;

-第五加法器，它将加权的误差信号加到延迟的中间校正信号上，产生校正信号或中间校正信号；- a fifth adder which adds the weighted error signal to the delayed intermediate correction signal to produce a correction signal or intermediate correction signal;

其中N是包括零的正整数，是根据在第N个校正信号单元后确定的校正信号的所需精度而确定的。Wherein N is a positive integer including zero, which is determined according to the required accuracy of the correction signal determined after the Nth correction signal unit.

所述校正信号发生器中的所述N个校正信号单元最好还分别包括：The N correction signal units in the correction signal generator preferably further include:

-第六调制器，它将所述延迟的数字传输信号调制到所述一个边带；- a sixth modulator which modulates said delayed digital transmission signal to said one sideband;

-第四延迟元件，它根据产生和解调相应的联播信号的处理时间延迟数字传输信号。- a fourth delay element which delays the digital transmission signal according to the processing time for generating and demodulating the corresponding simulcast signal.

或者，所述校正信号发生器中的所述N个校正信号单元还分别包括：Alternatively, the N correction signal units in the correction signal generator further include:

-第四延迟元件，它根据产生和解调相应的联播信号的处理时间延迟已调制到所述一个边带的数字传输信号。- A fourth delay element delaying the digital transmission signal modulated to said one sideband according to the processing time for generating and demodulating the corresponding simulcast signal.

按照本发明，最好将DRM信号作为所述数字传输信号发送。但是，也可以发送按照其它标准产生的数字传输信号。According to the invention, preferably a DRM signal is transmitted as said digital transmission signal. However, digital transmission signals generated according to other standards may also be transmitted.

按照本发明，最好将传统AM信号作为所述AM模拟传输信号发送。According to the invention, preferably a conventional AM signal is transmitted as said AM analog transmission signal.

附图说明 Description of drawings

从以下结合附图对示范实施例的说明可以明白按照本发明的DRM/AM联播系统的其它目的和特征，附图中：Other objects and features of the DRM/AM simulcast system according to the present invention can be understood from the following description of exemplary embodiments in conjunction with the accompanying drawings, in which:

图1示出按照本发明的AM联播信号发生器；以及Figure 1 shows an AM simulcast signal generator according to the present invention; and

图2示出按照本发明的联播信号的频谱。Figure 2 shows the frequency spectrum of a simulcast signal according to the invention.

具体实施方式 Detailed ways

按照本发明，将数字和模拟信号组合在一个信道中。为避免数字系统失真，在信道的一个边带中发送数字调制的信号，这允许在接收机中无失真地解调数字调制信号。According to the invention, digital and analog signals are combined in one channel. To avoid digital system distortions, the digitally modulated signal is transmitted in one sideband of the channel, which allows the digitally modulated signal to be demodulated without distortion in the receiver.

而且，联播信号与现有的AM广播系统后向兼容，因为联播信号的包络理想地代表了模拟信号。按照本发明，通过用校正信号C调制AM信道的未调制边带来保证联播信号的后向兼容。按照本发明的联播信号的频谱示于图2。信道的上边带包括数字调制信号，例如DRM信号，而信道的下边带包括校正信号C。在两个边带的中心，将载波相加，以便获得对联播信号的估算值。当然，以下情况也是可能的：在信道的下边带发送数字调制信号，而在信道的上边带发送校正信号。Furthermore, the simulcast signal is backward compatible with existing AM broadcast systems because the envelope of the simulcast signal ideally represents an analog signal. According to the invention, backward compatibility of the simulcast signal is ensured by modulating the unmodulated sidebands of the AM channel with the correction signal C. The frequency spectrum of a simulcast signal according to the invention is shown in FIG. 2 . The upper sideband of the channel comprises a digitally modulated signal, eg a DRM signal, and the lower sideband of the channel comprises the correction signal C. At the center of the two sidebands, the carriers are summed to obtain an estimate of the simulcast signal. Of course, it is also possible to transmit the digitally modulated signal in the lower sideband of the channel and the correction signal in the upper sideband of the channel.

按照本发明的联播信号的包络解调产生具有全声频带宽的无干扰模拟声频信号。如果是10kHz的AM信道，则模拟信号的声频带宽是5kHz。所以，声频带宽并未因本发明的联播信号而改变。Envelope demodulation of a simulcast signal in accordance with the present invention produces a glitch-free analog audio signal having a full audio bandwidth. If it is a 10kHz AM channel, the audio frequency bandwidth of the analog signal is 5kHz. Therefore, the audio bandwidth is not changed by the simulcast signal of the present invention.

仅在信道失真或模拟AM/IF滤波器的频率响应失真的情况下，即，在具有低质量、非对称和IF(中频)滤波器特性的AM接收机的情况下，声频信号才有失真。The audio signal is distorted only in case of channel distortion or in the frequency response of analog AM/IF filters, ie in the case of AM receivers with low quality, asymmetrical and IF (Intermediate Frequency) filter characteristics.

数字调制的DRM信号不受模拟信号的干扰。Digitally modulated DRM signals are free from interference from analog signals.

校正信号的产生过程最好是迭代过程。这种迭代方法可将DRM信号调制到上边带，将模拟信号调制到下边带。然后，在两个边带的中心将载波相加，以获得联播信号的估算值。由包络解调器将全联播信号的估算值(包括上边带USB、下边带LSB和载波)解调。随后，从模拟信号中减去包络解调后的模拟信号，得到误差信号。然后用常数k加权误差信号，再在下一步将误差信号加到模拟信号上，得到代表模拟声频信号的LSB信号的新估算。所述迭代过程重复进行N次，直到获得校正信号C并产生和发送按照本发明的联播信号为止。The correction signal generation process is preferably an iterative process. This iterative approach modulates the DRM signal into the upper sideband and the analog signal into the lower sideband. The carriers are then summed at the centers of the two sidebands to obtain an estimate of the simulcast signal. An estimate of the full simulcast signal (including USB, LSB, and carrier) is demodulated by an envelope demodulator. Subsequently, the envelope-demodulated analog signal is subtracted from the analog signal to obtain an error signal. The error signal is then weighted by a constant k and added to the analog signal in a next step to obtain a new estimate of the LSB signal representing the analog audio signal. The iterative process is repeated N times until the corrected signal C is obtained and the simulcast signal according to the invention is generated and transmitted.

还可以根据模拟信号和/或数字信号和/或误差信号的幅度来改变常数k。It is also possible to vary the constant k depending on the magnitude of the analog and/or digital and/or error signal.

图1示出按照本发明优选实施例的示范的AM联播(信号)发生器。按照本发明的联播信号由第一调制器1和第二调制器2产生，调制器1将数字传输信号调制到传输信道载波的一个边带，此处为上边带USB，而调制器2将校正信号C调制到传输信道载波的上边带，此处为下边带LSD。Figure 1 shows an exemplary AM simulcast (signal) generator in accordance with a preferred embodiment of the present invention. The simulcast signal according to the invention is produced by a first modulator 1 and a second modulator 2, the modulator 1 modulating the digital transmission signal to one sideband of the carrier of the transmission channel, here the upper sideband USB, and the modulator 2 correcting Signal C is modulated onto the upper sideband of the transport channel carrier, here the lower sideband LSD.

此外，为了产生按照本发明的联播信号，第一加法器3将所述两个边带相加并且可能将两个边带中心的载波信号相加，所述载波信号由载波信号发生器4产生。Furthermore, to generate the simulcast signal according to the invention, the first adder 3 adds the two sidebands and possibly the carrier signal in the center of the two sidebands, said carrier signal being generated by the carrier signal generator 4 .

输送到第一调制器1的数字传输信号在时间上对应于校正信号C，即，在产生校正信号C时将数字传输信号延迟以便与校正信号匹配。The digital transmission signal supplied to the first modulator 1 corresponds in time to the correction signal C, ie the digital transmission signal is delayed in order to match the correction signal when the correction signal C is generated.

此外，按照图1所示的本发明的联播信号发生器包括校正信号发生器，在此情况下，所述发生器也将数字信号延迟。校正信号发生器包括：第三调制器5，它将所述数字传输信号调制到所述一个边带，此处为上边带；第四调制器6，它将所述模拟传输信号调制到另一个边带，此处为下边带；第二加法器7，它将所述两个边带相加并且将所述两个边带中心的由第二载波信号发生器8产生的载波信号相加。此外，校正信号发生器包括：第一包络解调器9，它对这样产生的联播信号进行包络解调；第一延迟元件10，它根据产生和解调相应的联播信号的处理时间延迟模拟传输信号；第一减法器11，它从延迟的模拟传输信号中减去包络解调后的联播信号，产生误差信号；第一乘法器12，它用时变和非时变变量加权误差信号；第三加法器13，它将加权的误差信号加到延迟的模拟传输信号上，产生校正信号或中间校正信号；以及第二延迟元件，它根据产生和解调相应的联播信号的处理时间延迟数字传输信号。Furthermore, the simulcast signal generator according to the invention shown in FIG. 1 includes a correction signal generator, which in this case also delays the digital signal. The correction signal generator comprises: a third modulator 5, which modulates the digital transmission signal to the one sideband, here the upper sideband; a fourth modulator 6, which modulates the analog transmission signal to the other The sideband, here is the lower sideband; the second adder 7, which adds the two sidebands and adds the carrier signal generated by the second carrier signal generator 8 at the center of the two sidebands. In addition, the correction signal generator comprises: a first envelope demodulator 9, which performs envelope demodulation on the thus generated simulcast signal; a first delay element 10, which delays according to the processing time for generating and demodulating the corresponding simulcast signal Analog transmission signal; first subtractor 11, which subtracts the envelope-demodulated simulcast signal from the delayed analog transmission signal to generate an error signal; first multiplier 12, which weights the error signal with time-varying and time-invariant variables ; the third adder 13, which adds the weighted error signal to the delayed analog transmission signal to generate a correction signal or an intermediate correction signal; and a second delay element, which delays according to the processing time of generating and demodulating the corresponding simulcast signal digital transmission signal.

如上所述，校正信号发生器的这些元件(可以认为它们是一个校正信号单元)或者产生校正信号或者产生中间校正信号。由这一个校正信号单元产生的校正信号通常只是粗略的估算，不一定会得到模拟传输信号的正确传输。但是，也可以认为其质量已足够。在其质量不够的情况下，由第三减法器13提供的信号可以用N个后续的校正信号单元按照以前处理模拟传输信号的同样方式进行处理。在此情况下，也应相应地延迟数字传输信号。这种重复处理可以进行N次，即由N个类似的后续校正信号单元进行处理，其中N为包括零的正整数，是根据在第N个校正信号单元后确定的校正信号的所需精度而确定的。As mentioned above, these elements of the correction signal generator (which can be considered as a correction signal unit) generate either correction signals or intermediate correction signals. The correction signal generated by this one correction signal unit is generally only a rough estimate, and may not necessarily result in correct transmission of the analog transmission signal. However, its quality can also be considered sufficient. In the event that its quality is not sufficient, the signal provided by the third subtractor 13 can be processed with N subsequent correction signal units in the same way as previously for analog transmission signals. In this case, the digital transmission signal should also be delayed accordingly. This repeated processing can be carried out N times, that is, it is processed by N similar subsequent correction signal units, where N is a positive integer including zero, and is determined according to the required accuracy of the correction signal determined after the Nth correction signal unit definite.

Claims (9)

1. a generation is combined in the method for an amplitude modulation(PAM) network signal in the transmission channel with digital transmission signal and analogue transmission signal, comprising:
-described digital transmission signal is modulated to a sideband of described transmission channel carrier wave, and
-correction signal (C) is modulated to another sideband of the described carrier wave of described transmission channel,
Wherein, determine described correction signal (C) like this, make the envelope demodulation of described transmission channel represent described analogue transmission signal,
Wherein, in iterative process, carry out generation described correction signal (C) by following steps:
-described digital transmission signal is modulated to a described sideband;
-described analogue transmission signal is modulated to described another sideband;
-with described two sideband additions;
-network signal of such generation is carried out envelope demodulation;
-producing error signal by the network signal that from described analogue transmission signal, deducts after the described envelope demodulation, described analogue transmission signal is according to producing and the processing time of the described network signal of demodulation is delayed;
-become or become when non-the described error signal of variable weighting when utilizing;
-be added to by error signal on the analogue transmission signal of described delay and produce new analogue transmission signal described weighting;
-correspondingly postpone described digital signal with the delay of described analogue transmission signal,
The analogue transmission signal that becomes when wherein utilizing another or become variable when non-and utilize described new generation will described whole process repetition N time as described analogue transmission signal, wherein N comprises zero positive integer, is according to the required precision of the described correction signal (C) of the analogue transmission signal that is defined as new generation after the N time iteration and definite.
2. the method for claim 1 is characterized in that described digital transmission signal is a digital radio Mondeal signal.
3. method as claimed in claim 1 or 2 is characterized in that described analogue transmission signal is traditional am signals.
4. amplitude modulation(PAM) simulcast signal generator that is used in a transmission channel transmission of digital transmission number and analogue transmission signal comprises:
-the first modulator (1), it is modulated to a sideband of described transmission channel carrier wave with described digital transmission signal, and
-the second modulator (2), it is modulated to another sideband of the described carrier wave of described transmission channel with correction signal (C),
Wherein, determine described correction signal (C) like this, make the envelope demodulation of described transmission channel represent described analogue transmission signal,
Wherein, provide first adder (3) to come described two sideband additions,
Wherein, provide correction signal generator, described correction signal generator comprises:
-Di three modulators (5), it is modulated to a described sideband with described digital transmission signal;
-Di four modulators (6), it is modulated to described another sideband with described analogue transmission signal;
-second adder (7), it is with described two sideband additions;
-the first envelope demodulator (9), it carries out envelope demodulation to the network signal of such generation;
-the first delay element (10), it postpones described analogue transmission signal according to the processing time of generation and the corresponding network signal of demodulation;
-the first subtracter (11), it deducts the network signal after the described envelope demodulation from the analogue transmission signal of described delay, produce error signal;
-the first multiplier (12) becomes when it utilizes and the described error signal of change variable weighting when non-;
-Di three adders (13), it is added to by the error signal with described weighting on the analogue transmission signal of described delay and produces described correction signal (C) or middle correction signal; And
-the second delay element (14), it postpones described digital transmission signal according to the processing time of generation and the corresponding network signal of demodulation.
5. amplitude modulation(PAM) simulcast signal generator as claimed in claim 4 is characterized in that described correction signal generator also comprises N correction signal unit, and described N correction signal unit comprises separately:
-Di five modulators (15 1..., 15 N), be used for correction signal in the middle of described is modulated to a sideband;
-Di four adders (16 1..., 16 N), be used for described two sideband additions;
-the second envelope demodulator (17 1..., 17 N), be used for the network signal of such generation is carried out envelope demodulation,
-Di three delay elements (18 1..., 18 N), be used for postponing described middle correction signal according to the processing time of generation and the corresponding network signal of demodulation;
-the second subtracter (19 1..., 19 N), be used for producing error signal by the network signal that the middle correction signal from described delay deducts after the described envelope demodulation;
-the second multiplier (20 1..., 20 N), become when being used to utilize and the described error signal of change variable weighting when non-;
-Di slender acanthopanax musical instruments used in a Buddhist or Taoist mass (21 1..., 21 N), be used for being added on the middle correction signal of described delay and produce described correction signal or middle correction signal by error signal with described weighting;
Wherein, N comprises zero positive integer, is to determine according to the required precision of the described correction signal of determining behind N correction signal unit (C).
6. amplitude modulation(PAM) simulcast signal generator as claimed in claim 5 is characterized in that described N correction signal unit also comprises separately:
-Di six modulators (22 1..., 22 N), be used for the digital transmission signal of described delay is modulated to a described sideband;
-Di four delay elements (23 1..., 23 N), be used for postponing described digital transmission signal according to the processing time of generation and the corresponding network signal of demodulation.
7. amplitude modulation(PAM) simulcast signal generator as claimed in claim 5 is characterized in that described N correction signal unit also comprises separately:
-Di four delay elements, it postpones the described digital transmission signal of modulated to a described sideband according to the processing time of generation and the corresponding network signal of demodulation.
8. as each described amplitude modulation(PAM) simulcast signal generator in the above-mentioned claim 4 to 7, it is characterized in that described digital transmission signal is a digital radio Mondeal signal.
9. as each described amplitude modulation(PAM) simulcast signal generator in the above-mentioned claim 4 to 7, it is characterized in that described analogue transmission signal is traditional am signals.
CNB038257769A 2003-01-10 2003-01-10 Digital radio Mondeal/AM simulcast Expired - Fee Related CN100502263C (en)

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