I got this e-mail four times !! Once from ietf-list, from megaco-list and from [EMAIL PROTECTED] and again from enum-list. I like to see this company also in censored-list ! Kimmo Rantanen > The title: Flash Bandwidth 1KHz to 100MHz > Digital Controlled Broadband > Anti-alias & Reconstruction Filter > > Dear Sir: This is my discussion article. > > The details: > http://www.cnindex.net/~tjsh/Base_of_Broadband_Access.html > http://www.cnindex.net/~tjsh/Base_of_Broadband_Access.doc > > Sincerely, > > Robert Tan > 11.22 > > > > Flash Bandwidth 1KHz to 100MHz > Digital Controlled Broadband > Anti-alias & Reconstruction Filter > The Next Era Web of Multimedia Data-stream > Transmission Solution of the Internet! > > By Robert Tan > Update: 1999. 11. 22 > > For the many more format and definite of standard of digital film and > video, digital audio > and the other multimedia data stream of tomorrow, the existing network > technology including > the modern internet webs will be fabulous and difficult to transmit it > for us. The Endpoint > Congestion almost resistant our viewer area full of the entire world, We > would need the > straightway link of the multi-media data-stream in real-time for us. > Would you like to get a lower cost & more effective digital signal > channel in a wide-bandwidth > or broadband hybrid coax cable system? For the FTTX, HFC networks, > especially in the HFC > networks with the 256QAM or 64VSB digital modulation technology systems, > the SSB-ASK or the > VSB-ASK technology transmission systems would be used normally. The > Flash Bandwidth 1KHZ to > 100MHz digital control a variable frequency bandwidth, it is > high-performance anti-alias & > reconstruction (FBW) filter, it will be able to provide a variable > multiplex sub-frequency > band in any broadband HFC system. With the FDM assistant digital carry > system and SSB or VSB > signal channel, a group of FBW filters will provide separate > multi-frequency bands in spectrum > without any cross talking and distortion by a large frequency range in a > high-speed high- > effective transmission system. In a FTTX or HFC web, this digital > controlled signal channel > would have a very large frequency spectrum changed dynamic range. For a > large client group, > such as the Broadband Cable Internet Access or HFC users, one of them > would like to get a > variable data speed according to the applications of his needed. It will > provide a lot of > digital control frequency bandwidth which is separated one another in > HFC transmission system, > and it will more effective for the "hot clients", such as the VOD video > clients or the other > high-code rate users and high-speed data stream user's applications. The > FBW will improve the > speed of the data stream, diminish the amount of the spare resource > seizing of "Cool Clients", > reduce the calculations of the DSP processor of the center web main > switching system and the > branch switching system. Reduce the CPU utilities of the applications in > all of client > communication adapter and its cost of produce is very important. The > "Cool Clients" mains > the IP telephone users or the other lower speed code rate audio > applications. Anyway, the > speed of the up-stream data and down-stream data speed could be changed > to any value you > needed, and the changing degree will be very smoothly and very simply in > writing one or > two bytes in the command system of communication web switcher. By the > high-speed frequency > variable characteristic, if the FBW filter were used in your FTTX or HFC > switching system, > the upward and downward data stream speed could be managed and attempted > by your command > system. So that, the transmission bandwidth will be able to adjusted to > your needed in any > time within one millionth second. The real-time will be very more > improved and more effective > on the communication main roads such as FTTX and HFC system, > transmission controlling system > will completely control the data stream in real-time. > > > > Dear Technology Research and Development Administrator: > I am an electronic engineer in the field of Analog and Digital > filters researching and > designing. I had been a DSP engineer for ten years. My development field > is electronic circuits > -- digital and analog hardware designing and researching in applications > of Digital Signal > Processing. My works contains the frequency spectrum analysis, digital > audio and digital video > systems, noise spectrum controlling and processing, and the other > military applications. I have > researched and designed several kind of analog and digital anti-alias & > reconstruction filters. > A few years before, in my R&D works, I find the special frequency of the > filters is usually > fixed, it could be very difficult to change the cutoff frequency of the > low-pass anti-alias > & reconstruction filter. But the fixed filter could not suit the target > of my technical > applications. If we want to get several special frequency of the > filters, we must to use > several different fixed filters or instead of fixed filter with > switching capacity filter > or digital filter, such as IIR or FIR filter, and their frequency must > be variable in order > to change the analysis frequency. It is very important for the spectrum > analysis system and > the digital random real time vibrated controlling system. But, in this > way, we must pay for > digital IIR or FIR filter, it is very expensive in the price, take a > large space for the DSP > chips and its outside memory banks to install it. So, we would get into > much troubles and > complex questions from a simple problem. > However, we have the switching capacity technologies, and the product of > up to 8th order > filters is a very normally used. But the switching capacity filter will > have a high noise > and low frequency range, and it has a non-exactly special frequency, > generally. The special > frequency of most of the switching capacity filters is from 1/95 to > 1/105 times of its main > switching clock and it is difficult to improve its accuracy. Actually, > the switching capacity > filter circuit is very difficult to adjust and use in applications. > Anywise, its order is > normally below 8th order, and the special frequency and bandwidth of the > switching capacity > filters is below to 50KHz, and the amplitude response is not exactly > yet, the dynamic range > of the amplitude is very low, normally, it is below the 48dB. Except of > frequency range from > 0 to 50Hz, in this field, its dynamic range is lower than 30 dB and not > usefully, it is > normally being used in the speech processing circuit and the other lower > frequency band > processing systems. Attention, all of this analysis is not including the > phase noise of the > main switching clock and the noise of clock feed through yet. The > others, it is difficult to > get much more analysis frequency bands or special frequency points for > the switching capacity > filters, it is especially for the higher frequency band which is > approached to the top > frequency point. All of these characteristics of the switching capacity > filters will restrict > its applications in the area of modern digital communications. > The others method of the filters designing is the contact-time analog > filter .I have found > some method. It could make many transfer functions. Such as the > elliptical function, > Chebyshev function and Butterworth function, but there is some > interesting things here, > it is that the same circuit frame could be built into many transfer > functions, and it > would have programmable (digital controlled) special frequency. Changing > special frequency > on line is available. It could get the very wide frequency range, very > quickly to change > the used band, and the digital controlled circuit is very directly and > simply, the special > frequency step is very smoothly (because the Frequency is controlled by > long bit Digital > multiplier). In that points, integrate the FBW filter circuit technology > is very useful > for the digital controlling and processing systems. Because of the > Digital Controlling > Flash Bandwidth Filer (FBW) is depend on a few chips of high quality 8 > or 12 bits long > Digital Multiplier and a few chips of high-speed amplifiers. The other, > this filter > technology is used with a few exactitude resistors and exactitude > capacitors also. For > example, an 8th order elliptical filter need 8chips of dual Digital > Multiplier and several > chips high bandwidth amplifiers, 8chips exactitude capacitors and > several chips exactitude > resisters. If it is possible, integrating all the Digital Multiplier and > amplifiers into > one chip or one plastic package (mixed circuit), place all the > exactitude resistors and > capacitors out of the package. It will be finest filter and very easy to > used and could > be re-designed agilely by the customers and the OEMs. The parameter of > the filters is > depending on the value of the resistors and the capacitors. Its value > could be designed > by the customs freely and calculated by constant functions directly, and > that is very > simply. > And then, the FBW filters would be very usefully in the FTTX or HFC > networks. For working > with the 256QAM or 64VSB modulation technology and any narrow-band > transmission technology > systems, such as the Broadband Cable Internet Access webs, HDTV or SDTV > and VOD systems, it > would compress the used frequency bandwidth in mostly extent. Because of > the WAN systems in > any nations will be depending on the "Tree structures" as the main road > in the webs in the > future. The frequency source is very expensive in this web, It would be > welcomed in the > Internet web digital information transmission, exchanging and switching > technology area, > DSP area and digital communications area, such as MAN and WAN coax cable > webs or the FTTX > system applications. Any way, the most of modern networking transmission > mode is TDM. It > is very suitable for the text material or media, because of it is a > fixed media in size, > and it is the fixed continue time in length and generation procedure. > But the most of > multimedia is not to be suitable with that. The data stream of voice and > video will have > no constant size to be forecasted has no constant procedure time. It is > only have a constant > and fixed bandwidth of media data stream. Because of your interesting > points is onto the > generations and the procedures of the video or audio information of thus > material or the > news, such as the high quality digital cinema, digital musicale and so > on. Certainly, you > could take the any multimedia information and any moving picture on you > desktop through the > Internet Web. It will be appeared the true alive world with you in any > site you can go! So > that, the only one of best way of the media data streams transmission > and exchanging is the > FDM mode with the SSB-ASK or VSB-ASK technology, it should be working > with the QAM or > VSB- ASK digital modulation technology in the future Internet webs. > FBW filter would be used in most of switchers and routers, which is > depending on the FDM > technologies. For the cable TV systems STB (set top box), video & audio > servers in Broadband > Cable Internet Access, cable modems or the client-end adapters in the > most of family users > and the most of business cable users in the world will need a very great > deal of broadband > web transmission bandwidth. Because of that, in any modern > home-electronic equipment, such > as the Internet officers, shopping's and the VOD or the other broadband > information > electronics, its using method would be depending on the FDM switching > technologies. So that, > the "Online Home-Electronics" or the other Internet accessing products > which is used in > people's homes would be simply to operate and easy to use. And it must > be depend on the > simply low-layer hardware equipment and protocols of the webs, such as > the VOD systems > and the STB terminals in the Broadband Cable Internet Access or HFC > networks. The FBW > technology would provide us more applicable and useable method in the > physics layer of > the public HFC networks, its FDM applications in a broadband web get us > in a lower building > price, more effective than the other technology. Such as the Broadband > Cable Internet Access > webs, HFC networks, FTTX networks, and the other and the other WAN > public broadband networks > would have a very great applications of the FBW filters. > The others, using a Flash-Band-width filter will help you get in to a > fully data stream > bandwidth management of any expensive data-link channels and the very > expensive communication > data stream bandwidth, such as the communication data-link of the > satellite communication > systems, and the ocean bottom communication systems. FBW filter will > control the any leased > data-stream bandwidth in dynamic mode within a very large frequency > range, a large range of > signal frequency bandwidth and data-stream speed in any time for a > communication administration > and operation system. It will change the bandwidth with you leased data > stream very imminently > within several microsecond, improve your expensive bandwidth of > data-stream transmission channel, > save your leased payment and money cost for any customers of digital > communications and any > Tele-communication operating and service company. It will hold any > important transmission of > data-stream in smoothly and take it freely. So, in this system, any > interrupt of your > communication data stream will be never. > > > > The Digital Control Flash Bandwidth Filter specifications: > (1) General details: > Frequency range: 0.1Hz--100MHz > Useable frequency range: 0.1Hz--100MHz(at least) > Special frequency step: 0.001Hz-1000KHz > Transfer functions: Elliptical, Butterworth, Chebyshev, and Bassel > function. > And the others contacted-time filters. > Available filter type: Low-pass filter, High-pass filter, Notch filter, > > Band-pass filter and All-pass filter. > Noise Level: -160dB(max) (Only depend on the number of the used > amplifiers.) > Order range: 2nd--12th(Depend on the sensitivity of the transfer > functions.) > Filter switching time: Less than 300nS (Filter Setting time is 200nS) > Useful Range: Anti-alias filters, Reconstruction filters. > > (2) Pass Band Specifications: > Frequency selectable range: 100Hz--100MHz > (Depend on the performance of the selected amplifiers) > Special Frequency steps: 1Hz-1000KHz > Pass band Dynamic range: 90dB (Depend on the amplifiers and the order of > the filter.) > Ripple: 0.01--1.0dB (Only depend on the filter function and the > passband ripple designed.) > > (3) Pass to Stop Band: > Drop speed of Interim-band Cut-off: > 180db/oct (8th order elliptical function with 0.05dB pass-band ripple) > > (4) Stop Band: > Amplitude min drop: 120db(8th elliptical filter for example) > Frequency range: 0.1Hz--100MHz > (Depend on the amplifiers and the Digital Multiplier specifications) > > (5) Digital Control specifications: > Digital component is used (8 bit, 10bit, 12bit, and 16bit is available). > > The special frequency is (N1/N2) * Frequency (ref). > (The N1, N2 is the Digital component input byte, from 8bit to 16 bit.) > The Frequency (ref) is form 10Hz to 10MHz. > (This parameter is depends on one RC time constant.) > High speed and voltage feedback high-bandwidth operation amplifiers are > required. > > (6) Requirement: (The filter section of 8th order) > Digital component: 8 chips (Selections depend on the frequency range) > > High-performance Amplifiers: 12 to 24 chips (Selections depend on the > frequency) > Capacitors or inductors: 8 chips (exactitude degree value is 1% to > 0.1%) > Resistors: 16-36 chips (exactitude degree value is 1% to 0.1%) > > (7) Group delay: Depend on the function of the filter > designed, filter > phase response designed, and the filter > order. > > (8) Filter switching time: Less than 300nS (Filter Setting time is > 200nS) > > > > > The Comparisons of the 4 kinds active Filters > > For example: > 8th order filter > Switching Capacity Filter > Digital Filter > (FIR or IIR Filter) > Traditional > Fixed Analog Frequency Filter > Digital controlling FBW filter > > Noise Level or (THD+N) Value: > > Highest > > -48db > Lower > > -70db > Very Low > > -160db > Very Low > > -120db > Filter Dynamic Range > The Value: > Little > > 50db > Middle > > 70db > Very Large > > 160db > Large > > 100db > Real-time active frequency > The range of the value: > Narrow > > 200Hz to 300KHz > Wide > > 0.001Hz to 50KHz > Very Wide > > 0.1Hz to 1MHz > Very wide > > 0.001Hz to 100MHz > The Outside in advance Anti-alias & Reconstruction assistant filter > requirement > > The degree of assistant filter Quality > Required > > > > > > 2nd to 4th order anti-alias & reconstruction assistant outside filter > Required > > > > > > 4th to 6th order anti-alias & reconstruction assistant outside filter > Not required. > > > > > > ---------- > Not required > > > > > > ---------- > The Precision of the special frequency: > The ability of on-line changing the filter special frequency > &Method > Low. > > +/-3% > > Very easy > (Changing the switching clock) > High > > +/-3% > > Very difficult > (Change a new programs and > parameters ) > Very high > > 0.1% > > Very difficult. > (Changing the system time > constant) > Very high > > 0.1% > > Easy(Writing digital word to the filter control port) > The complex degree of the filter system designing > &The used space > Simple > > > > Small > Very complex > > > > Very large > Simple > > > > Middle > Middle > > > > Middle > The price for produce a filter > &The difficult degree of the applications > Very low > > $10~50 > > Easy > Very high > > $300~600 > > Difficult > Low > > $30~90 > > Easy > Middle > > $50~100 > > Middle > Anti-alias & Reconstruction filter Performance: (1)Pass Band > Ripple &Dynamic Range: > (2)Stop Band > Rejection > (3)Interim Band Dropping Slope: > Low Quality & Low Price. > > > +/-0.2db > > 50db > > 55db > > 50db/oct > Normal or High Quality & High price > > +/-0.01db > > 70db > > 70db > > 130db/oct > Normal Quality & Low Price > > > +/-0.01db > > 120db > > 120db > > 180db/oct > High Quality & & Middle Price. > > > +/-0.01db > > 110db > > 120db > > 180db/oct > Online/offline Changing of highest/lowest special frequency rate & > Range: > &changing time: > All available > 1000 times > 300Hz to 300KHz > > 10mS(Time of PLL tracking & locked) > Offline available > Not available > > Not available > > Not available > (Reboot DSP & A/D system) > Offline available > 1000 times > > Not available > > Not available > > All available > 100000 times > 1KHz to 100MHz > > 160nS (TTL 2 bytes writing time) > Filter online reconstruction setting time (The total time of > filter frequency switched) > > > 10mS > > > Not available > > > Not available > > > 300nS > Group delay and the phase response: > Producer design only. > Linear or Producer design only. > Producer design only. > Producer & User design is available. > Equality data stream speed or comported speed of its TxDAC : > &Butterworth 8th filter > (Broadband channel HFC usable signal dynamic range is about 50dB): > 4.8Kbps to 4.8Mbps > (600SPS to 600KSPS) > > > 8bit TxDAC > Constant 400Kbps > (50KSPS) > > > > 8bit TxDAC > Constant 800Mbps > (100MSPS) > > > > 8bit TxDAC > 16Kbps to 1600Mbps > (2KSPS to 200MSPS) > > > 8bit TxDAC > Suitable with the 8bit TxDAC and used 256QAM (or 64VSB) in SSB/VSB mode > of technology > (Data speed of Base Band): > > Carrier signal RF full-band tie up: > Difficult to be used with the 256QAM and 64VSB. > (High Level Phase Noise) > 4.8Kbps(Min) > 4.8Mbps(Max) > > 384Hz to 384KHz > Difficult to be used in variable data-speed transmission or receiving > system > > > > Difficult to be used in variable data-speed transmission or receiving > system > With 256QAM: > 8Kbps(Min) > 800Mbps > (Max) > With 64VSB: > 12Kbps(Min) > 1200Mbps (Max). > > 1.28KHz to 128MHz > For the HFC Specialty signal TV Channel: > 40dB Eb/N > 6MHz Full-band 64VSB model > @1KHz-6MHz > Data-rate: > > > > With 64VSB: > > 9.375Kbps > (Min) > 56.25Mbps > (Max) > > Contact Address: > No.2 Buliding Room1007, > Mudanyuan Beili, Haidian District > Beijing P. R. China, > Post Code: 100083 > Name: Tan Junsheng (Robert Tan) > Tele: 8610-82076834, 86-13701070213(Mobile) > E-mail: [EMAIL PROTECTED] or [EMAIL PROTECTED] > Homepage: http://www.cnindex.net/~tjsh > Details Remind: > http://www.cnindex.net/~tjsh/Base_of_Broadband_Access.html > > > > > _______________________________________________ > enum mailing list > [EMAIL PROTECTED] > http://www.ietf.org/mailman/listinfo/enum >
