CN1581717A - Apparatus for transmitting telephone signal in coaxial cable - Google Patents

Apparatus for transmitting telephone signal in coaxial cable Download PDF

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Publication number
CN1581717A
CN1581717A CN 03153403 CN03153403A CN1581717A CN 1581717 A CN1581717 A CN 1581717A CN 03153403 CN03153403 CN 03153403 CN 03153403 A CN03153403 A CN 03153403A CN 1581717 A CN1581717 A CN 1581717A
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pass
low
pass filter
telephone
signal
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CN 03153403
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Chinese (zh)
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方国元
左明雷
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华为技术有限公司
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Publication of CN1581717A publication Critical patent/CN1581717A/en

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Abstract

The device includes low pass filter module, high-pass filter module and interface conversion module. The low pass filter module connected to output end of coaxial line through interface conversion module converts between telephone signal transferred on coaxial line and telephone signal transferred on twisted-pair. The said high-pass filter is connected to output end of coaxial line and input end of cable TV signal. The invention takes full advantage of bandwidth resources and cheap general telephone equipment to provide phone service. Thus, it is convenient for cable TV provider to provide telephone service as well as lowers cost for providing telephone service.

Description

一种在同轴电缆上传输电话信号的装置 An apparatus for transmitting telephone signals over a coaxial cable

技术领域 FIELD

本发明涉及通信领域,尤其涉及一种在同轴电缆上传输电话信号的装置。 The present invention relates to communication field, and particularly relates to an apparatus for telephone signals transmitted on the coaxial cable.

技术背景目前很多家庭都已开通有线电视和电话,其中有线电视采用的是同轴电缆传输,电话采用双绞线传输。 Background At present, many families have opened cable TV and telephone, cable television which uses a coaxial cable, twisted pair telephone transmission.

有线电视信号目前是通过调制方式把模拟或数字电视信号调制到46M--860M的频率范围内,并通过有线电视射频电缆传送到用户家中。 Cable television signal by the modulation scheme is currently the analog or digital television signal modulated onto a 46M - 860M of the frequency range, and transmitted to the user's home via cable television RF cable. 双绞线电话信号包括DTMF信号,电话语音信号,馈电,振铃信号等。 Twisted-pair telephone signals include DTMF signal, telephone voice signal, feed, ringing signals. DTMF信号和电话语音模拟信号的频率范围为300hz--3400hz,馈电为直流信号,由电话局端设备送出,常见为-48V,也可以是其他的电压范围。 DTMF signals and the frequency range of the analog telephone voice signal is 300hz - 3400hz, feeding a DC signal, sent by the telephone central office equipment, typically from -48 V, and may be other voltage range. 振铃信号为<100HZ的低频信号(如CC08交换机可提供25HZ,75V的振铃信号)。 Ringing signals <100HZ low-frequency signal (e.g., CC08 switches provide ringing signal 25HZ, 75V) is.

当前用户通过有线电视同轴电缆收看数字或模拟的有线电视,而通过电话双绞线接入电话。 The current user to watch digital or analog cable TV coaxial cable, and twisted pair telephone access to the telephone. 一般的有线电视运营商拥有有线电视同轴电缆资源,但没有双绞线。 General Cable coaxial cable operators have the resources, but not twisted. 因此无法采用传统的电话技术为用户提供电话服务。 We can not use the traditional phone technology to provide users with telephone service. 只能使用CableModem技术为用户提供基于IP的电话方案。 Use only CableModem technology to provide users with IP-based telephony solutions. 而基于Cable Modem的接入技术需要为用户端提供Cable Modem设备,多媒体终端适配器(MTA),为局端提供CMTS设备,同时要求有线电视电缆进行双向改造,用户需购买相应设备,投资和工程量较大。 And Cable Modem access technologies based on the need to provide end users with Cable Modem equipment, multimedia terminal adapter (MTA), to provide central office CMTS equipment, two-way transformation requires cable television cable, users need to purchase the appropriate equipment, the amount of investment and engineering larger.

发明内容 SUMMARY

本发明的目的就是要提供一种利用同轴电缆传送电话信号的装置,从而可以通过该装置,利用目前已经很便宜的传统电话技术为用户提供通话服务。 Object of the present invention is to provide an apparatus for transmitting telephone signals using a coaxial cable, so that the device can use very cheap now conventional to provide users with telephony calls.

为此,本发明采用如下技术方案:一种在同轴电缆上传输电话信号的装置,其特征在于包括:低通电路模块、高通电路模块及接口变换模块;所述的低通电路模块连接于同轴电缆输出端,通过接口变换模块将同轴电缆上传送的单端电话信号与电话终端上传送的双绞线电话信号进行转换;所述的高通电路模块连接于同轴电缆输出端与有线电视信号输入端。 To this end, the present invention adopts the following technical solution: An apparatus for transmitting telephone signals over a coaxial cable, comprising: low-pass circuit module, the high-pass circuit module and an interface conversion module; said module is connected to a low-pass circuit the output of the coaxial cable, the twisted pair telephone signals transmitted on a single telephone terminal end of the telephone signal transmitted on the coaxial cable via the interface conversion module converting; the high-pass circuit module is connected to the output end of the coaxial cable and the cable a television signal input terminal.

所述的低通电路模块为低通滤波器。 The low-pass filter circuit is a low pass module.

所述的低通滤波器的频率通带范围为小于等于低通截止频率。 The frequency range of the pass band of the low pass filter is a low-pass cut-off frequency or less.

所述的低通滤波器的低通截止频率大于电话信号所用的截止频率。 Low pass cutoff frequency of the low pass filter cut-off frequency is greater than the telephone signals are used.

所述的低通滤波器的截止频率小于有线电视信号的频率范围低限。 Cutoff frequency of the low-pass filter is smaller than the lower limit of the frequency range of the signal cable.

所述的高通电路模块为高通滤波器。 The high-pass circuit module is a high-pass filter.

所述的高通滤波器的频率通带范围为大于或等于高通截止频率。 The frequency range of the pass band of the high pass filter is equal to or greater than a high pass cutoff frequency.

所述的高通滤波器可以为无源高通滤波器或者有源高通滤波器。 The high-pass filter can be a passive filter or an active high-pass filter is a high pass.

所述的接口变换模块,带有POTS接口和双绞线接口,所述的POTS接口连接低通电路模块的输出端,所述的双绞线接口连接用户电话终端或局端电话终端。 The interface conversion module, and an interface with a POTS twisted pair interface, the interface connected to the low pass output of the circuit module of POTS, the twisted pair telephone terminal connected to the user terminal or a telephone central office.

所述的接口变换模块,包括有低通滤波电路和耦合电路;所述的低通滤波电路将直流馈电信号和低频振铃信号进行滤波并送往POTS端;所述的耦合电路完成差分信号到单端信号的耦合转换。 The interface conversion module, comprising a low-pass filter circuit and the coupling circuit; said low pass filter circuit and the low frequency feed signal DC ringing signal is filtered and sent to POTS terminal; coupling circuit according to the signal from differential coupled to a single-ended signal conversion.

本发明技术方案通过采用同轴电缆传输同时传输电话信号的技术,可以充分利用同轴电缆的带宽资源和目前很便宜的普通电话设备提供电话服务,方便了有线电视运营商提供电话服务,降低了提供电话业务成本。 Aspect of the present invention by using a coaxial cable transmission technology to transmit telephone signals at the same time, can take advantage of coaxial cable and the bandwidth resources currently very cheap ordinary telephone devices providing telephone services to facilitate the cable operators provide telephone services, reduced provide telephone service costs.

附图说明 BRIEF DESCRIPTION

图1是本发明同轴电缆传输电话信号技术方案;图2是本发明中低通滤波器的一种实现电路示意图;图3是本发明高通滤波器的一种实现电路示意图;图4是本发明一种接口变换电路实现电路示意图;图5是采用本发明的电话应用实现方案示意图;图6是本发明信号示意图。 FIG 1 is a coaxial cable telephone signal aspect of the present invention; FIG. 2 is a low-pass filter of the present invention, a circuit schematic implemented; FIG. 3 of the present invention is a high-pass circuit diagram A filter implemented; FIG. 4 is present An interface circuit converting the invention to achieve a circuit diagram; FIG. 5 is a telephony application using the present invention is to achieve a schematic embodiment; FIG. 6 is a schematic view of a signal of the present invention.

具体实施方式 Detailed ways

下面结合说明书附图来说明本发明的具体实施方式。 It will be described below with reference to the accompanying drawings embodiments of the present invention.

本发明提供一种利用同轴电缆传送电话信号的装置,从而可以利用目前已经很便宜的传统电话技术为用户提供电话,和基于Cable Modem的电话方案相比,成本非常低。 The present invention provides an apparatus for transmitting telephone signals using a coaxial cable, which can take advantage of already very cheap to provide users with traditional telephony telephone, and Cable Modem compared based telephony programs, the cost is very low.

本发明的技术方案由一个低通电路模块和一个高通电路模块,接口变换模块组成,该低通电路模块和高通电路模块的功能是实现不同频率的信号的过滤,控制不同频率的信号走不同的通道,目前,可以实现该过滤功能的器件很多,比如常用的低通滤波器及高通滤波器,本发明以使用低通滤波器及高通滤波器为例进行说明,但其保护范围不限于此,可以实现相关功能的低通及高通电路,按照本发明方式的组合,都应落在本发明的保护范围之内。 Aspect of the present invention consists of a low-pass circuit module, and a high-pass circuit module, the interface conversion module, the function of the low-pass circuit module and the high pass circuit blocks is to implement filtering signals of different frequencies, the control signals of different frequencies take a different channel current, the device may be implemented in many filtering function, such as the commonly used low-pass filter and a high pass filter, the present invention is to use a low pass filter and a high pass filter as an example, but its scope is not limited thereto, related functions can be realized low-pass and high-pass circuit, according to the combination of the present invention should fall within the scope of the present invention.

如图1所示,该低通滤波器连接于目前传送有线电视信号的同轴电缆,滤波器的输出端通过一个接口变换模块连接于电话终端,这里可以是用户电话终端也可以是局端设备。 1, the low-pass filter is connected to a coaxial cable television signal is being sent, the output of the filter through an interface conversion module is connected to the telephone terminal, where the user may be a terminal may be a telephone central office equipment .

低通滤波器是常见的电路元件,对于低于其截止频率的低频信号衰减很小,而对于高于其截止频率的高频信号衰减很大,从而阻止了高于截止频率的信号的通过。 The low pass filter is a common circuit element for low-frequency signal below its cut-off frequency of low attenuation, while for high-frequency signals above its cutoff frequency is greatly attenuated, thereby preventing the cut-off frequency higher than the signal through.

本发明高通滤波器连接于同轴电缆与有线电视输入端,用于对同轴电缆上传递的信号进行过滤。 The present invention is a high-pass filter is connected to the coaxial cable input, a signal for transmission on coaxial cable filtration. 高通滤波器是也是常见的电路功能,对于高于其截止频率的信号阻抗很小,而对于低于其截止频率的信号衰减很大,从而阻止了低于截止频率的信号的通过。 High-pass filter is also common circuit function, for signals above its cutoff frequency impedance is small, and for the cut-off frequency lower than the signal attenuation is large, thereby preventing the signal is lower than the cutoff frequency.

本发明方案中使用的低通滤波的截止频率要求大于电话信号所用的截止频率,即3400hz以上,同时截止频率要小于有线电视信号的频率范围低限,即46Mhz以下。 The cutoff frequency of the lowpass filter used in the embodiment of the present invention require more than the cutoff frequency used for telephone signals, i.e. 3400hz above, while the cutoff frequency is less than the lower limit of the frequency range of the cable signal, i.e., the following 46Mhz.

本发明方案中使用的低通滤波器可以允许直流信号通过,以便传送电话信号中的馈电和振铃信号。 Low-pass filter used in the embodiment of the present invention may allow for a DC signal, to transmit the telephone ringing signal and the feed signal.

本发明方案使用的低通滤波器的频率通带范围为DC(0赫兹)--f1(低通截止频率),3400hz<f1<46Mhz,其实现方式可以是无源低通滤波器或有源低通滤波器,本发明低通滤波器的一种实现电路如图2所示:从图2中可见,其由若干个电感L21--L27及电容C21--C29连接组成。 Embodiment of the present invention is used in the frequency range of the pass band of the low pass filter is DC (0 Hz) - f1 (low-pass cutoff frequency), 3400hz <f1 <46Mhz, its implementation can be a passive or active low-pass filter low-pass filter a low-pass filter of the present invention is to realize the circuit shown in Figure 2: seen from Figure 2 which consists of several inductor L21 - connected to form a C29 - L27 and a capacitor C21.

本发明方案中所使用的高通滤波器的频率通带范围为f2(高通截止频率)~无穷大。 Passband frequency range of the high-pass filter used in the embodiment of the present invention is f2 (high-pass cutoff frequency) ~ infinity. 其实现方式可以是无源高通滤波器或有源高通滤波器、高通滤波器的一种实现电路如图3所示。 This is achieved a high-pass filter may be passive or active high-pass filter, a high-pass filter circuit shown in Figure 3 is achieved. 从图3中可见,本发明的高通滤波器由若干个电感L31--L34及电容C31--C36连接组成。 Be seen, the high pass filter of the present invention consists of several inductor L31 in FIG. 3 - L34 and capacitors C31 - C36 is connected components.

本发明的接口变换电路用于实现把差分双绞线信号与单端信号的双向转换。 The interface conversion circuit of the present invention for achieving the bidirectional converter twisted pair differential signal to single-ended signal. 其功能是把来自电话终端或电话局端设备的双绞线上的差分电话信号转变为单端信号送往低通滤波器,同时把来自低通滤波器的电话单端信号变为差分信号送往电话终端或局端电话设备。 Its function is to differential signals on the twisted-pair phone terminals or telephone from the telephone central office equipment into a single-ended signal to the low-pass filter, while the single-ended signal from the telephone low-pass filter becomes a differential signal transmission to the telephone terminal or central office telephone equipment.

接口变换电路实现电路有很多种。 Converting the interface circuit implementations There are many circuit. 本发明使用的一种实现电路如图4所示:从图中可见,直流馈电信号和低频振铃信号通过L1--L3和C1,C2组成的低通滤波电路(低通截止频率<300HZ)送往POTS端。 The present invention is implemented using a circuit shown in Figure 4: seen from the figure, the DC and low frequency ringing signal feeding signal by L1 - L3 and low-pass filtering circuit C1, C2 composition (a low-pass cut-off frequency <300HZ ) sent to the POTS terminal. 而语音信号和DTMF信号通过C3--C12,L4--L7,T1信号完成差分信号(ring,tip)到单端信号pots的耦合转换。 The speech signal and a DTMF signal C3 - C12, L4 - L7, T1 signal from differential signal (ring, tip) is coupled to the single ended signal pots.

本发明基于以上技术方案的工作原理如下:双向电话信号的传输原理:来自电话终端或局端的电话信号是差分低频信号(RING,TIP),通过双绞线送往接口换模块,通过接口变换变成单端信号POTS,由于是低频信号和直流信号,可以通过低通滤波器送到有线电视同轴电缆的芯线上,同样来自有线电视同轴电缆芯线上的单端电话信号是低频信号和直流信号,可以通过低通滤波器送往接口变换模块,经过接口变换模块后转为双端差分信号送往电话终端或局端设备。 The present invention is based on the principle of the above technical solution is as follows: two-way telephone signal transmission principle: the telephone signal from a telephone terminal or the central office is a differential low frequency signal (RING, TIP), changing the interface module sent over twisted pair, through the interface conversion becomes the POTS signal to a single-ended, as is the low frequency signal and a DC signal, can be sent to the coaxial cable core wire through a low pass filter, the same single-ended signal from the telephone line is a cable TV coaxial cable low frequency signal and a DC signal, can be sent to the interface conversion module through the low pass filter, through the interface conversion module into the double-ended or differential signal to the central office telephone terminal device. 低频信号无法通过高通滤波器到达有线电视接收和发送端设备。 Low-frequency signal can not reach the transmitting side apparatus and a receiving cable through a high pass filter.

为便于理解,以下给出电话信号在一次电话呼叫中的信号传输过程,如图5所示,局端交换机提供直流馈电信号,通过ring1和tip1信号线送往本设备,本设备转换为单端信号后送往同轴电缆的芯线,在用户端的本设备将馈电信号通过ring2和tip2信号线送往电话,实现电话机内部电路的供电,用户开始拨号电话机拨号电路产成dtmf信号,通过ring2和tip2差分送出到本设备,本设备转换为单端信号通过同轴电缆芯线送往局端的本设备,转换为差分信号后送往电话交换机.电话交换机处理后根据拨号呼叫被叫,被叫接通后建立通路,被叫的语音信号从交换机通过双绞线送出再经过本设备转换为同轴电缆单端信号送往主叫方的本设备,再转换为差分信号送给电话。 For ease of understanding, the following gives a signal in a telephone signal transmitted during a telephone call, as shown in FIG. 5, the central office switch to provide the DC feed signal, sent by the equipment tip1 ring1 and the signal line, the present apparatus converts a single after the end of the signal sent to the core wire of the coaxial cable, the terminal will present the device user by ring2 feed signal and sent to telephone line tip2 signal, the power feeding circuit internal telephone, the user starts to dial the telephone dialer circuit generates a signal to dtmf , fed to the unit via ring2 and tip2 differential, the equipment to a single ended signal to the central office through a coaxial cable wire according to the present apparatus, is converted into the differential signals sent to the telephone exchange after dialing the telephone switch handles the call according to the called party , switched paths established after called the called voice signal transmitted through the present apparatus further sent to the calling party according to the present apparatus for converting single-ended signal through the twisted pair coaxial cable from the exchange, and then into a differential signal to the telephone . 同理主叫电话的语音信号也同样通过用户端的本设备和局端的本设备送往局端交换机。 Similarly calling telephone voice signal is also sent to the central office switch by a user terminal and the central office device according to the present device. 从而实现通过同轴电缆提供电话的功能。 Enabling the telephone function through a coaxial cable.

当用户被呼叫时,局端会送出振铃信号通过ring1和tip1送出到局端的本设备,通过局端的本设备和用户端的本设备完成信号在同轴电缆上的传输,送往用户电话机,用户电话机振铃,用户拿起电话,之后实现双方通话。 When the user is called, the central office sends a ringing signal will be sent to the central office by the present apparatus and ring1 TIP1, completion of the transmission signal on the coaxial cable by the central office and customer premises equipment according to the present device, sent to the subscriber telephone, users telephone ringing, the user picks up the phone, after the two sides to achieve the call.

有线电视信号的传输:有线电视同轴电缆上的有线电视信号作为高频信号不能通过低通滤波器送到电话终端或电话局端设备,但可以通过高通滤波器送往有线电视接收端。 Signal transmission cable: coaxial cable as a cable television signal on a high frequency signal can not pass through the low pass filter or a telephone central office to the telephone terminal device, but the receiving terminal cable sent to a high pass filter.

电话信号和电视信号在本设备中的信号流向如图6所示。 Signal flow telephone and TV signals in the present apparatus is shown in Fig. 从图中可见,有线电视信号及电话信号可以同时承载在同轴电缆上,这样,为用户带来了很大的方便及经济利益。 Seen from the figure, cable television signals and telephone signals can be carried simultaneously on coaxial cable, so in order to bring great convenience and economic interests.

Claims (10)

1.一种在同轴电缆上传输电话信号的装置,其特征在于包括:低通电路模块、高通电路模块及接口变换模块;所述的低通电路模块连接于同轴电缆输出端,通过接口变换模块将同轴电缆上传送的单端电话信号与电话终端上传送的双绞线电话信号进行转换;所述的高通电路模块连接于同轴电缆输出端与有线电视信号输入端。 1. An apparatus for transmitting telephone signals over a coaxial cable, comprising: low-pass circuit module, the high-pass circuit module and an interface conversion module; said low-pass circuit module is connected to the output end of the coaxial cable, via the interface the transform module twisted-pair telephone signals transmitted on a single telephone terminal end of the telephone signal transmitted on the coaxial cable converter; said high pass circuit module is connected to a coaxial cable output terminal and signal input terminal.
2.如权利要求1所述的装置,其特征在于所述的低通电路模块为低通滤波器。 2. The apparatus according to claim 1, wherein said low-pass filter circuit is a low pass module.
3.如权利要求2所述的装置,其特征在于所述的低通滤波器的频率通带范围为小于等于低通截止频率。 The apparatus as claimed in claim 2, characterized in that the frequency range of the pass band of the low pass filter is a low-pass cut-off frequency or less.
4.如权利要求2所述的装置,其特征在于所述的低通滤波器的低通截止频率大于电话信号所用的截止频率。 4. The apparatus according to claim 2, characterized in that the low pass cutoff frequency of the low pass filter cut-off frequency is greater than the telephone signals are used.
5.如权利要求2所述的装置,其特征在于所述的低通滤波器的截止频率小于有线电视信号的频率范围低限。 5. The apparatus according to claim 2, characterized in that the cutoff frequency of the low-pass filter is smaller than the lower limit of the frequency range of the signal cable.
6.如权利要求1所述的装置,其特征在于所述的高通电路模块为高通滤波器。 6. The apparatus according to claim 1, wherein said circuit module is a high-pass high-pass filter.
7.如权利要求6所述的装置,其特征在于所述的高通滤波器的频率通带范围为大于或等于高通截止频率。 7. The apparatus according to claim 6, characterized in that the frequency range of the pass band of the high pass filter is equal to or greater than a high pass cutoff frequency.
8.如权利要求6所述的装置,其特征在于所述的高通滤波器可以为无源高通滤波器或者有源高通滤波器。 The apparatus as claimed in claim 6, wherein said high-pass filter can be a passive filter or an active high-pass filter is a high pass.
9.如权利要求1所述的装置,其特征在于所述的接口变换模块,带有POTS接口和双绞线接口,所述的POTS接口连接低通电路模块的输出端,所述的双绞线接口连接用户电话终端或局端电话终端。 9. The apparatus according to claim 1 of the twisted pair, characterized in that said interface conversion module, and an interface with a POTS twisted pair interface, the interface connected to the low pass output of the circuit module of POTS, telephone line connected to the user terminal or a telephone central office terminal.
10.如权利要求9所述的装置,其特征在于所述的接口变换模块,包括有低通滤波电路和耦合电路;所述的低通滤波电路将直流馈电信号和低频振铃信号进行滤波并送往POTS端;所述的耦合电路完成差分信号到单端信号的耦合转换。 10. The apparatus according to claim 9, wherein the interface conversion module, comprising a low pass filter circuit and the coupling circuit; said low pass filter circuit and the DC feed signal filtering low frequency ringing signals and sent to the POTS terminal; completion of the coupling circuit is coupled to convert the differential signal to single-ended signal.
CN 03153403 2003-08-12 2003-08-12 Apparatus for transmitting telephone signal in coaxial cable CN1581717A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102117998A (en) * 2011-03-09 2011-07-06 安徽电信器材贸易工业有限责任公司 Adaptor type IPTV (internet protocol television) user connecting line
CN102163782A (en) * 2011-03-09 2011-08-24 安徽电信器材贸易工业有限责任公司 Directly-connected internet protocol television (IPTV) user link
US8159927B2 (en) 2007-02-16 2012-04-17 Gennum Corporation Transmit, receive, and cross-talk cancellation filters for back channelling
US8462759B2 (en) 2007-02-16 2013-06-11 Semtech Canada Corporation Multi-media digital interface systems and methods

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8159927B2 (en) 2007-02-16 2012-04-17 Gennum Corporation Transmit, receive, and cross-talk cancellation filters for back channelling
US8462759B2 (en) 2007-02-16 2013-06-11 Semtech Canada Corporation Multi-media digital interface systems and methods
CN101304393B (en) 2007-02-16 2013-07-17 西姆特科加拿大有限公司 Multi-media digital interface systems and methods
CN102117998A (en) * 2011-03-09 2011-07-06 安徽电信器材贸易工业有限责任公司 Adaptor type IPTV (internet protocol television) user connecting line
CN102163782A (en) * 2011-03-09 2011-08-24 安徽电信器材贸易工业有限责任公司 Directly-connected internet protocol television (IPTV) user link

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