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Topic: In-band on-channel

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In-band on-channel - Wikipedia, the free encyclopedia In-band on-channel (IBOC) is a method of transmitting digital radio and analog radio broadcast signals simultaneously on the same frequency. In-band on-channel digital radios using iBiquity's standard are being marketed under the brand "HD Radio" to highlight the quality of reception. As of May 2005, a limited number of different receiver models have been made, and a few stations have received experimental authorization from the FCC to transmit in a multiplexed multichannel mode on FM. en.wikipedia.org /wiki/In-band_on-channel   (673 words)

In-band on-channel - Wikipedia, the free encyclopedia In-band on-channel ( IBOC) is a method of transmitting digital radio and analog radio broadcast signals simultaneously on the same frequency. As of May 2005, a limited number of different receiver models have been made, and a few stations have received experimental authorization from the FCC to transmit in a multiplexed multichannel mode on FM. It is also partly because of concern that stations' branding, using their current frequency, would be lost to new channel numbers, though virtual channels such as on digital television would eliminate this, and stations already swap frequencies sometimes. en.wikipedia.org /wiki/IBOC   (673 words)

BROADCASTPAPERS.COM For adjacent channels the distortion is especially severe, owing to the tight channel spacings and small guard bands. Within any given adjacent channel combiner module, if the channel entering the narrowband port is tuned to experience a 3 dB attenuation at the upper and lower frequency edges, this means that the wideband port attenuation (normally inverse) is also equal to 3 dB. The size of this guard band depends upon system types, but is typically of the order of a couple of hundred kHz; for example, between the PAL B stereo sound carrier and the upper adjacent channel lower extreme carrier in a Coded Orthogonal Frequency Division Multiplex (COFDM) system, the frequency separation is just 170 kHz.\ www.broadcastpapers.com /tvtran/RFSPracticalUHF03.htm   (1492 words)

Zenith: HDTV While calibrated band stop filters can be placed in line with the measurement test point to remove the in-band signal power when the extreme band edges of the adjacent channel splatter are being measured, this is not a most desirable situation. The in-band signal characteristics are examined in regard to departure from 100% data eye opening (error vector magnitude) of the data symbols as affected by: circuit or "white" noise, phase noise, intermodulation noise caused by non-linearity, and intersymbol interference caused by linear distortions (phase and magnitude). In-band signal characteristics define the quality of the DTV signal as generated at a television transmitter and fed to the transmission line and antenna for broadcast to the DTV receiver. www.zenith.com /sub_hdtv/hdtv_papers_transmission_param.html   (10409 words)

Channel In-band on-channel In-band on-channel is a method of transmitting bandwidth for analog stereo, decreasing the amount ava... In-band adjacent-channel Although rarely called by its name, IBAC is the method of placing digital TV stations on channe... Channel controller A channel controller is a simple CPU used to handle the task of moving data to and from the memory of... www.brainyencyclopedia.com /topics/channel.html   (1784 words)

Patent 5949796: In-band on-channel digital broadcasting method and system "In-band" refers to generation of the DAB signal in the conventional FM-band of frequencies, and "On-channel" refers the co-existence of the conventional analog FM-band signal and the DAB signal within the conventional FM-band FCC emission mask, and not necessarily the 200 kHz allocation increment. For example, the second-adjacent channel interference circumstance, discussed subsequently, limits the maximum frequency offset of the outer edges of the IBOC DAB signal in sidebands 11 and 13 relative to center frequency 1. A method and system are provided for the transmission and reception of an In-band On-channel (IBOC) FM-band digital audio broadcast (DAB) signal. www.freepatentsonline.com /5949796.html   (1784 words)

Patent 5850415: In-band on-channel digital broadcasting An important consideration in the development of an in-band, on-channel FM digital audio broadcasting (FM-DAB) system is the requirement that the digital signals not interfere with the analog FM signals occupying the same frequency allocation. While frequency separation may not seem feasible for in-band, on-channel systems, it may be accomplished in systems which employ frequency sliding of the digital signal. In-band on-channel FM DAB requires demodulation of a low power digital signaling waveform in the presence of a high power FM signaling waveform. www.freepatentsonline.com /5850415.html   (1784 words)

CCIE, CCNA, CCNP, CCVP Cisco Training Resources An example might be two different organizations using the same channels where one is on floor 1 and the other on floor 2 or in an adjacent office on the same floor. To prevent this do not use channels that overlap, move the access points far enough apart that the cells do not overlap, turn the power down to achieve the same effect, or change the orientation of the antennas, with one horizontal and the other vertical. About the only solution to all band interference other than getting rid of the source is to change bands, such as from 802.11b to 802.11a. www.certificationzone.com /cisco/newsletter/SL/nla_03-09-04_1.html   (1702 words)

Satellite Communications Glossary Disruptions in a signal channel caused by power leaking from an adjacent channel, typically resulting from insufficient filtering, tuning, or frequency control in the reference or interfering channel (or both). The range of frequencies occupied by a signal; the information-carrying capacity of a communications channel. The smooth Gaussian pulses require less bandwidth to transmit and are less susceptible to adjacent channel interference. www.aero.org /publications/crosslink/winter2002/backpage.html   (1224 words)

ES Info Page 2000 Checking the band again at 1045 gives very strong TV signals with Germany on channels E2 and E4, Switzerland on channel E3, Czech Rep on channel R1 and Austria on channel E2A, also a few German speaking stations fading on FM after 1050. Mostly Russia on TV channels R1 and R2 trough out the evening, also around 1925 Belarus noted on channel R1 and Ukraine on same R1 channel at 1930. Strong TV signals at 0935 with Ukraine on channels R1 and R2 and Yugoslavia on channel E3. www.fmdx.com /main00.htm   (1224 words)

iBiquity : Press Release The company's In-Band On-Channel (IBOC) Digital Audio Broadcasting technology is designed to permit stations to use their current radio spectrum to transmit existing AM and FM analog simultaneously with new high-quality digital signals which eliminate multipath, noise, and reduce interference. USA Digital Radio was established in 1991 as a partnership among CBS Corporation, Westinghouse Electric Corporation, and Gannett Co., Inc. to develop In-Band On-Channel Digital Audio Broadcasting for the radio broadcast industry. USA Digital Radio is committed to the establishment of a universal In-Band On-Channel Digital Audio Broadcasting implementation. www.ibiquity.com /press/na/010799.htm   (1224 words)

Method and apparatus for transmission and reception of FM in-band on-channel digital audio broadcasting - US Patent 6549544 Lower sideband main channel 46 contains the sub-carriers at locations -356 through -507 and is used to transmit the same program material as is transmitted in the upper sideband main channel, but using punctured convolutional coding that is complementary to that used in the upper FDAB sideband. The main channel sub-carriers are used to transmit the program material to be broadcast in the form of data bits of the coding algorithm at a rate of at least 96 thousand bits per second (kbps). The extended band starts to positively contribute to the coding gain when the spectral density of the interferer is about the same level as the extended band signal. www.patentstorm.us /patents/6549544.html   (1224 words)

USADR Alliance In-Band On-Channel Digital Audio Broadcasting (IBOC DAB) is a broadcasting technology that uses the current radio spectrum to transmit existing AM and FM analog simultaneously with new high-quality digital signals, which eliminate multipath and noise, and reduce interference. QEI and USA Digital Radio will work together to develop, test, and promote the necessary In-Band On-Channel (IBOC) Digital Audio Broadcast (DAB) transmission equipment required for the radio broadcast industry. USA Digital Radio is developing and marketing In-Band On-Channel Digital Audio Broadcasting (IBOC DAB) technology for AM and FM radio. www.qei-broadcast.com /usadr.htm   (1224 words)

Digital Audio Radio Broadcast Systems Laboratory Testing Nearly Complete Tests also were conducted to assess the compatibility of the analog and digital ancillary service channels with the in-band on-channel and in-band adjacent channel signals. The basic goals of the laboratory tests were to determine the digital audio quality produced by each system, the reception reliability, the ability to coexist with other receivers and broadcast stations (including, in the case of in-band on-channel, the host analog station), and the repeatability of all tests. The in-band tests (conducted on specific systems) included tests to measure possible interference to the existing analog transmission caused by the introduction of in-band digital audio radio. www.lerc.nasa.gov /WWW/RT1995/5000/5610h.htm   (1224 words)

NTIA TR-97-343, Appendix C The test set which was used as the desired signal transmitter was also tuned to channel 67 and was modulated by an internal 1 kHz tone adjusted in amplitude for a 3 kHz signal deviation. Two pairs of frequencies were chosen so that both frequencies of each pair were either in the marine band (156-174 MHz) or both out of the marine band. The power of the desired signal, S, from the RF output of the test set was adjusted and its value recorded in dBm when the SINAD of the radio receiver under test was 15 dB. www.ntia.doc.gov /osmhome/reports/tr97343/tr97343c.html   (1224 words)

in-band signaling - Glossary - CNET.com In some locations, this third wire isn't available, and bandwidth must be "borrowed" from the other two data-carrying B channels. For Basic Rate Interface (BRI) service, this means that each B channels is limited to 56 kbps throughput (instead of 64 kbps with out-of-band signaling). ISDN normally uses a separate wire called the D channel to set up calls and handle their signals. www.cnet.com /Resources/Info/Glossary/Terms/inbandsignaling.html   (1224 words)

Return Data Band I. Tube TH 371 and notch output filter excluded. Band IV/V. Tube RS 1034 L and notch output filter excluded. Band IV/V. Tube TH 347 and notch output filter excluded. www.itelcast.com /itelcast/tvlistino.html   (1224 words)

AMERICANS FOR RADIO DIVERSITY: FCC AND DIGITAL RADIO part 2 Still, the notice stressed that "the catalyst for this action is the progress of in-band, on-channel DAB technology. In a 28-page notice on digital audio broadcasting (DAB) issued Monday Nov. 1, the FCC stopped short of endorsing in-band, on-channel (IBOC) systems designed to allow the simultaneous broadcast of analog and digital signals without disrupting existing services. Among IBOC design issues [are] DAB systems that operate within existing AM/FM "emission masks," or limits, on signal power. www.radiodiversity.com /archives/000985.shtml   (1224 words)

Glossary A to F Adjacent channel interference  -  When the station you want is not receivable because of a much more powerful station in the next channel above or below, you have adjacent channel interference. FM receiving antennas  -  The FM radio band is 88-108 MHz, a 20 MHz band adjacent to channel 6. Before 1998, the FCC would never allow stations in the same city to occupy adjacent channels. www.hdtvprimer.com /ANTENNAS/glossaryA.html   (4749 words)

Digital Audio Radio Broadcast Systems Laboratory Testing Nearly Complete The basic goals of the laboratory tests were to determine the digital audio quality produced by each system, the reception reliability, the ability to coexist with other receivers and broadcast stations (including, in the case of in-band on-channel, the host analog station), and the repeatability of all tests. Tests also were conducted to assess the compatibility of the analog and digital ancillary service channels with the in-band on-channel and in-band adjacent channel signals. The in-band tests (conducted on specific systems) included tests to measure possible interference to the existing analog transmission caused by the introduction of in-band digital audio radio. www.grc.nasa.gov /WWW/RT1995/5000/5610h.htm   (776 words)

In-band adjacent-channel - Wikipedia, the free encyclopedia Although rarely called by its name, IBAC is the method of placing digital TV stations on channels in the existing analog TV bands. While this can also be applied to all radio bands, no country has yet done so except for TV. This page was last modified 19:05, 16 May 2005. en.wikipedia.org /wiki/In-band_adjacent-channel   (68 words)

What is digital radio? In-Band Reserve Channel (IBRC), which is based on using "spare" spectrum not able to be used for other services, is also a possibility. The two main in-band systems under development in the USA are In-Band On Channel (IBOC) and In-Band Adjacent Channel (IBAC). While the spectrum band known as the L band is reserved internationally, the existing television spectrum, VHF band III, is used extensively in Europe. happy.emu.id.au /lab/info/digradio/drbguide.htm   (1280 words)

RFID was RE: M&S trial throwaway RFID tags Because of the limitations of the SAW filter often used for channel filtering it is not uncommon for a system to be limited by the ultimate rejection of this filter in the IF of the receiver (after the downconversion mixer). Just recognising which sort of interference you have (blocking, adjacent channel,intermodulation) is difficult without the right test equipment and a knowledgeable engineer (hint: advertisement pending!). It is a commonplace to detect at > least six of these channels as simultaneously active within a few > rooms of each other in a multi-occupancy block. www.chiark.greenend.org.uk /pipermail/ukcrypto/2003-October/068286.html   (551 words)

Choosing the Right RF Measurements and Instruments for Your Application Needs - Tutorial - Products and Services - National Instruments For example, many commercial applications require channel power measurements for standards compliance and modulation measurements to analyze the quality of the data you are transmitting. Then, it returns the power in each band and compares the power in the adjacent channels to that in the main channel. Channel power defines a main channel and several adjacent channels. zone.ni.com /devzone/conceptd.nsf/webmain/18A32E5F9E8CCF6186256CF7007B19DF?opendocument&node=12586_US   (1111 words)

47 CFR PART 27 Base, fixed, control, and mobile transmitters in the 698–764 MHz and 776–794 MHz frequency bands must be operated only in accordance with the rules in this section to reduce the potential for interference to public reception of the signals of existing TV and DTV broadcast stations transmitting on TV Channels 51 through 68. When there is a dispute between a Guard Band Manager, or its spectrum user, and a non-contracting party, and the Guard Band Manager is unable or unwilling to resolve such dispute in a timely fashion, the non-contracting party may file a complaint with the Commission pursuant to §1.41 of this chapter. However, in the 100 kilohertz bands immediately outside and adjacent to a licensee's frequency block, a resolution bandwidth of at least 30 kHz may be employed. www.washingtonwatchdog.org /documents/cfr/title47/part27.html   (14049 words)

NCPA Band Plan On this band, adjacent channel interference is harder to overcome for repeaters. A LAN frequency is the forwarding channel within the LAN and to the backbone. Some digital is coordinated on auxiliary channels by NARCC. www.n0ary.org /ncpa/ncpabandplan.html   (730 words)

TechOnLine - A Novel Extra Low IF Receiver for the GSM Band With the in-band interference, we consider the useful signal to be at the power level of -82 dBm and the various adjacent channels located from ±200 up to ±600 kHz. The adjacent channel rejection is a measure of the capability of the receiver to receive a wanted modulated signal without exceeding a given degradation due to the existence of neighboring unwanted modulated signals. Then, a low-noise amplifier amplifies the signal, and the spectrum is down-converted to a lower frequency using a Hartley image-rejection mixer. www.techonline.com /community/tech_group/comm/14598   (1349 words)

iBiquity Digital - Technology FAC automatically differentiates between the digital sideband transmission and other analog signals that might be closely adjacent to the channel in order to suppress the interfering station. iBiquity Digital's HD Radio technology utilizes an In-Band On-Channel (IBOC) Digital Audio Broadcasting systems approach to deliver new digital services simultaneously with the existing analog broadcast. With more than half of stations currently facing interference from adjacent stations, this approach delivers redundant information on both sides of the current channel location in order to ensure optimal performance in all listening environments. www.ibiquity.com /technology/iboc.htm   (380 words)

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