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In electronics and communications, voiceband is a term we apply to the "group" or band of frequencies that cover the range of human hearing. That range is generally 20 Hertz (Hz or cycles per second - cps) to 20 kiloHertz. That's 20 Hz to 20 kHz in the shorthand of the trade. Oh, and a link is provided below to get you to the Wikipedia article on voiceband. Hey, the nice folks over there provide knowledge for free. Why not surf on over and help yourself?
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What has the author Franklin Forsthove Mackenzie written?
Franklin Forsthove Mackenzie has written: 'A practical voiceband television system design'
What has the author S F A Ip written?
S. F. A. Ip has written: 'Trellis-coded modulation for voiceband data modems'
What can you do to improve your voice after a hit in the throat which left one voiceband paralised?
See an ear nose and throat doctor, (ENT) and ask to be sent to a speech-language pathologist who can do therapy to improve your voice by strengthening your vocal cords.
What is the difference between ASDL and ADSL?
Abstract-Type and Scheme-Definition Language (ASDL) is a computer languageAnalytical Sciences Digital Library (ASDL) is one of several digital libraries in the US National Science Digital LibraryAsymmetric digital subscriber line (ADSL) is a type of digital subscriber line (DSL) technology, a data communications technology that enables faster data transmission over copper telephone lines rather than a conventional voiceband modem can provide.They are common transposition spelling errors for each other.
T-1 ansi standards?
ANSI T1.413 defines the requirements for the single Asymmetric Digital Subscriber Line (ADSL) for the interface between the telecommunications network and the customer installation in terms of their interaction and electrical characteristics. ADSL allows the provision of voiceband services (including POTS and data services up to 56 kbit/s) and a variety of digital channels. In the direction from the network to the customer premises, the digital bearer channels may consist of full-duplex low-speed bearer channels and simpler high-speed bearer channels; in the other direction, only low-speed bearer channels are provided.The American National Standards Institute (ANSI) Telecommunications Committee created the first standardized ADSL specification. It defines the minimum requirements for satisfactory performance of ADSL systems using the Discrete Multi-Tone (DMT) line code. DMT divides the useful bandwidth of the standard two wire copper medium used in the PSTN, which is 0 to 1104 kHz, into 256 separate 4.3125 kHz wide bins called sub-carriers.Up to 254 sub-carriers are used; each of these 254 sub-carriers can support the modulation of 0 to 15 bits. The data frame rate (baud rate) is 4,000 frames per second, the maximum theoretical downstream data rate of an ADSL system is 15.24 Mbit/s. However, because the data is split up into packets (actually Reed-Solomon encoded codewords) of 255 bytes, the maximum achievable downstream data rate is 8.128 Mbit/s (including other overheads). It is possible to interleave two Reed-Solomon codewords and obtain one logical codeword of 510 bytes. If this is done, then the maximum theoretical download speed goes back up to around 15 Mbit/s.In the upstream direction, a maximum of 30 sub-carriers can be used, again each frame modulated with up to 15 bits. Taken with the frame rate of 4,000 per second, the maximum throughput is a just over 1.5 Mbit/s.In order to combine the PSTN service with download and upload ADSL signals the bandwidth is split into discrete parts using frequency-division multiplexing (FDM). In this case: 0-4 kHz is POTS, 26-138 kHz is the upload band and 138-1100 kHz is the download band.
What is an asymetric digital subscriber line?
Short for asymmetricdigitalsubscriberline, ADSL is a type ofDSL broadband communications technology used for connecting to the Internet. ADSL allows more data to be sent over existing copper telephone lines (POTS), when compared to traditional modem lines. A special filter, called a micro filter, is installed on a subscriber's telephone line to allow both ADSL and regular voice (telephone) services to be used at the same time. ADSL requires a special ADSL modem and subscribers must be in close geographical locations to the provider's central office to receive ADSL service. Typically this distance is within a radius of 2 to 2.5 miles. ADSL supports data rates of from 1.5 to 9 Mbps when receiving data (known as the downstream rate) and from 16 to 640 Kbps when sending data (known as the upstream rate).Asymmetric digital subscriber line (ADSL) is a type of digital subscriber line technology, a data communications technology that enables faster data transmission over copper telephone lines than a conventional voiceband modem can provide. It does this by utilizing frequencies that are not used by a voice telephone call.· A splitter, or DSL filter, allows a single telephone connection to be used for both ADSL service and voice calls at the same time.· ADSL can generally only be distributed over short distances from the telephone exchange, typically less than 4 kilometres (2 mi), but has been known to exceed 8 kilometres (5 mi) if the originally laid wire gauge allows for further distribution.At the telephone exchange the line generally terminates at a digital subscriber line access multiplexer(DSLAM) where another frequency splitter separates the voice band signal for the conventional phone network. Data carried by the ADSL are typically routed over the telephone company's data network and eventually reach a conventional Internet Protocol network.ADSL standardsVersionStandard nameCommon nameDownstream rateUpstream rateApproved inADSLANSI T1.413-1998 Issue 2ADSL8.0 Mbit/s1.0 Mbit/s1998ADSLITU G.992.1ADSL (G.DMT)12.0 Mbit/s1.3 Mbit/s1999-07ADSLITU G.992.1 Annex AADSL over POTS12.0 Mbit/s1.3 Mbit/s2001ADSLITU G.992.1 Annex BADSL over ISDN12.0 Mbit/s1.8 Mbit/s2005ADSLITU G.992.2ADSL Lite (G.Lite)1.5 Mbit/s0.5 Mbit/s1999-07ADSL2ITU G.992.3ADSL212.0 Mbit/s1.3 Mbit/s2002-07ADSL2ITU G.992.3 Annex JADSL212.0 Mbit/s3.5 Mbit/sADSL2ITU G.992.3 Annex LRE-ADSL25.0 Mbit/s0.8 Mbit/sADSL2ITU G.992.4splitterless ADSL21.5 Mbit/s0.5 Mbit/s2002-07ADSL2+ITU G.992.5ADSL2+24.0 Mbit/s1.3 Mbit/s2003-05ADSL2+ITU G.992.5 Annex MADSL2+M24.0 Mbit/s3.3 Mbit/s2008ADSL uses standard telephone lines to transmit upstream and downstream data on a digital frequency, which sets these datastreams apart from the analog signals telephones and fax machines use. Because the ADSL signal is operating on a different frequency, the telephone can be used normally, even when surfing the Web with ADSL service. The only requirement will probably be inexpensive DSL filters on each phone or fax line, to remove any "white noise" on the line that might be generated from ADSL service.
