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Topic: Ringing signal

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In the News (Wed 20 Feb 19)

  Ringing signal - Wikipedia, the free encyclopedia
Ringing is said to be "tripped" when the impedance of the line reduces to about 600 ohms when the telephone handset is lifted off the switch-hook.
Caller ID signals are sent during the silent interval between the first and second bursts of the ringing signals.
The interrupted ring signal was designed to attract attention and studies showed that an intermittent two tone ring was the easiest to hear.
en.wikipedia.org /wiki/Ringing_signal   (315 words)

 Dictating machine control unit - United States Patent 4,122,305
Signals to be recorded by the dictating machine 10 are furnished over the line 50 to the decoder control unit 46 and are in turn furnished to the function control unit 12 by a line 54.
The signal produced by the coil is amplified by an amplifier 378 and rectified by means of a diode rectifier 380 connected in circuit with a resistor 382 and a capacitor 384.
The signal supplied on the line 584 is referred to as a strobe pulse, and is furnished to ensure that false operation of the gates 580-583 does not occur in response to spurious signals which may be present on the transmission line.
xrint.com /patents/us/4122305   (13334 words)

 Programmable ring signal generator - Patent 4656659
Ringing current presence detector 60 detects ring current in the subscriber loop from the output of buffer 58 by feeding the output signal to a peak detector circuit; the output of which peak detector is compared to a reference signal which defines the threshold for a positive current present condition.
Ring presence and ring-trip signals are coupled to the processor via termination control interface circuit 66, which provides the communication interface between the processor and the ring circuit and which is a portion of the ring circuit control logic 68.
Ringing voltage and current voltage is sensed across resistor 50 and coupled to ring-trip detector 62 via buffer 58 and attenuator 92, low pass filtered by filters 94 and 96 and coupled to the inputs of comparator 98; the output of comparator 98 being a logical ring-trip signal.
www.freepatentsonline.com /4656659.html   (2857 words)

 Ringback signal - Wikipedia, the free encyclopedia
In telephony, a ringback signal, usually consisting of an audio tone interrupted at a slow rate, provided to a caller to indicate that the called-party instrument is receiving a ringing signal.
This signal may be generated by the called-party servicing switch or by the calling-party switch.
A ringing signal returned to a caller to indicate that one of the types of delayed automatic calling is now ringing the called party.
en.wikipedia.org /wiki/Ringback_signal   (104 words)

 Telephone ringing circuits
The electronic ringing circuits are not sensitive to the ringing voltage and they easily ring with ring signal frequencies between 16 Hz and 60 Hz.
Another apprach for ring detecting is to use a full wave rectifier circuit to convert the AC sign signal to the DC suitable for optoisolator and then put current limiting resistor and zener diode to the rectifier output.
Ring detector must not detect ring signal which is 44-58V DC summed with 20-3400 Hz AC ring signal which is less than 10 V. The feeding resistance for ring generator is 800-1710 Hz.
www.tkk.fi /Misc/Electronics/circuits/telephone_ringer.html   (3105 words)

 Ringing signal generator - Patent 4584576
A ringing signal generator as claimed in claim 3 wherein said third digital signals produced by the said digital signal generator are encoded in compressed PCM so as to obtain a high dynamic level of the output of the ringing signal generator.
The invention relates to a d.c.-fed ringing signal generator which is intended to produce the ringing signal for a group of subscriber lines, in a telephone exchange or in telephone subscriber sub-exchanges to feed the ringing signal to telephone lines, from a direct current source.
The ringing signal generator comprises a plurality of cascade-arranged elements and in the first place a digital signal generator 7 which is controlled by the control signal CA generated by the central unit 6, to supply at its output terminal 8 a digital signal corresponding either to the ringing signal or to a zero signal.
www.freepatentsonline.com /4584576.html   (2206 words)

 Encyclopedia: Ringing signal
The ohm is the SI derived unit of electrical resistance (derived from the ampere and the watt).
Caller ID (Caller Identity Display or CID) is a telephony network service that transmits the callers telephone number to the called partys telephone equipment during the ringing signal or when the call is being set up but before the call is answered.
Categories: Telephony A dial tone is a telephony signal used to indicate that the telephone exchange is working and ready to accept a call.
www.nationmaster.com /encyclopedia/Ringing-signal   (592 words)

 Telephone ringing generators - Patent 4015091
The signal can then be used at the remote terminal to both indicate the need for ringing and as a control signal to aid in the generation of the ringing signal.
Ringing signals are generated from this high DC voltage by interrupting the voltage at a 20 Hz rate and interrupting the 20 Hz signal during the silent intervals of the ringing cycle.
The signal applied to terminal 203 is a pulse stream having the waveform shown at 205, comprising a 2-second stream of pulses at a 20 Hz rate interrupted for a 4-second silent interval.
www.freepatentsonline.com /4015091.html   (6817 words)

 Circuit arrangement for the indication of loop closure during the ringing condition - Patent 4809258
This voltage signal is subjected to analog to digital conversion and filtering as for the speech signal at other times except that the high-pass filtering otherwise employed is avoided, and in that the resulting digital signal is further summed over at least one period of the ringing signal frequency.
For the indication of ringing, a proportional voltage has in the past been derived from the subscriber termination line current, from which the alternating component arising from the ringing signal was filtered out by a low-pass filter.
The signal resulting therefrom is evaluated and causes the disconnection of the ringing signal voltage in a manner not shown.
www.freepatentsonline.com /4809258.html   (1132 words)

 United States Patent: 6,552,564   (Site not responding. Last check: 2007-11-05)
Clock signal delay or skew, caused by the characteristics of the distribution line, is an important factor in the transmission of clock signals and for this reason many interconnection or distribution lines attempt to minimize resistivity.
A signal generated by signal source 5 is transmitted along the long interconnection line 6, from node N2 to node N3, and ultimately to a destination point D1.
In order to control the resistance R of the interconnection line 6 to insure a signal at the end of the interconnection line, node N3, with minimized ringing and reflections with minimal delay the geometry of the line must be altered based upon the line resistivity.
web.engr.oregonstate.edu /~flf/6552564.html   (2701 words)

 Mini Glossary for NII Users
audible ringing tone: In telephony, a signal, usually consisting of an audio tone interrupted at a slow repetition rate, provided to a caller to indicate that the called-party instrument is being sent a ringing signal.
When the phase of the chroma signal corresponds to the preprogrammed state or states associated with the background color, or range of colors, behind the principal subject, the signal from the alternate, i.e., false, background is inserted in the composite signal and presented at the output.
When the phase of the chroma signal deviates from that associated with the background color(s) behind the principal subject, video associated with the principal subject is presented at the output.
www.its.bldrdoc.gov /projects/nii/nii-glos.html   (7087 words)

 Ringing signal -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-11-05)
A ringing signal is a (Transmitting speech at a distance) telephony signal that tells the user that there is an incoming call.
However, party line ringing is making a comeback in some small office and home office situations allowing (Duplicator that transmits the copy by wire or radio) facsimile machines and telephones to share the same line but have different telephone numbers.
(A small display that will show you the telephone number of the party calling you) Caller ID signals are sent during the silent interval between the first and second bursts of the ringing signals.
www.absoluteastronomy.com /encyclopedia/r/ri/ringing_signal.htm   (198 words)

 Cell phones, Home Phones, Business Phones, Cordless Phones and MORE!   (Site not responding. Last check: 2007-11-05)
Note that ringing voltage can be hazardous; when you're working on a phone line, be sure at least one telephone on the line is off the hook (in use); if any are not, take high voltage precautions.
The telephone company may or may not remove the 48 VDC during ringing; as far as you're concerned, this is not important.
The most common ringing device is the gong ringer, a solenoid coil with a clapper that strikes either a single or double bell.
phonewarehouse.com /sub/factsringer.asp   (924 words)

 United States Patent: 5,850,436
The ring is detected, and to answer, the answering system seizes the line in response to which the phone company connects the caller to its destination.
When the signal RELAY.sub.-- DRIVE.sub.-- is driven low by the demodulator (indicating that the demodulator 206 has detected a CIU RF carrier on lines 200A and 200B from the line 130), the switch 216 is flipped to position 2 to isolate the telephone 104 from the telephone line 130 (mode 2).
The output signal from the CODEC 344 is also provided to the input of an amplifier 350, which generates a signal MODAUD provided to the carrier current modem 316 to frequency modulate the CIU RF carrier onto the telephone line 130.
www.glendash.com /5850436.html   (16294 words)

 telephone ringer facts and telephone descriptions
Note that ringing voltage can be hazardous; when you're working on a telephone line, be sure at least one telephone on the line is off the hook (in use); if any are not, take high voltage precautions.
In the United States the telephone cadence is normally 2 seconds of ringing to 4 seconds of pause.
The most common telephone ringing device is the gong ringer, a solenoid coil with a clapper that strikes either a single or double bell.
www.affordablephones.net /Theringer.htm   (991 words)

 STMicroelectronics | HIGHLY INTEGRATED SLIC KIT TARGETED TO PABX AND KEY SYSTEM APPLICATIONS - L3235N   (Site not responding. Last check: 2007-11-05)
The AC ringing signal amplitude is up to 60Vrms, and for that purpose a positive supply voltage of +100V shall be available on the subscriber card.
The ringing cycles are synchronised by the L3234 in such a way that the ringing starts and stops always when the analog input signal crosses zero.
Ring trip is detected by means of the same internal circuitry used for off-hook detection.
www.st.com /stonline/books/ascii/docs/8425.htm   (3167 words)

 Product Folder : UCC3751 - Single Line Ring Generator Controller
In addition to providing the sinusoidal ringing signal, the controller and the power stage are designed to provide the required DC voltage across the output when the phone goes off-hook.
The DC voltage is also added as the offset to the ringing signal.
For normal ring signal generation, the primary switching frequency and secondary sampling frequency are precisely offset from each other by the ringing frequency to produce a high voltage low frequency alias signal at the output.
focus.ti.com /docs/prod/folders/print/ucc3751.html   (570 words)

 Learn more about Telephone in the online encyclopedia.   (Site not responding. Last check: 2007-11-05)
The telephone or phone is a telecommunications device designed to transmit speech by means of electric signals.
The very early constructions of the telephone was based on sound transportation through air rather than generated electric signals from speech.
The analog speech signals are carried over the digital backbone network as a stream of digitally encoded samples at a sample rate of 8 kHz.
www.onlineencyclopedia.org /t/te/telephone.html   (1035 words)

The SLI provides dial-tone, and converts voice and dialed numbers to digital signals, which are sent on a few wires to the exchange.
The analog speech signals are carried over the digital backbone network as a stream of digitally encoded samples at a sample rate of 8 kHz (8,000 numeric samples representing sound-pressure per second).
Due to crowding on the 2.4 GHz band, several "channels" are utilized in an attempt to guard against degradation in the quality of the voice signal.
www.brainyencyclopedia.com /encyclopedia/t/te/telephone.html   (4248 words)

 [Mgcp] Ring tone info   (Site not responding. Last check: 2007-11-05)
The next version of the basic packages draft, will allow the ringing tone in the line package to be parameterized with the number of ring cycles: Ringing (rg): See GR-506-CORE [5], Section 14.
The ringing signal may be parameterized with the signal parameter "rep" which specifies the maximum number of ringing cycles (repetitions) to apply.
The following will apply the ringing signal for up to 6 ringing cycles: S: l/rg(rep=6) If the "rep" parameter is specified, the signal times-out when the number of repetitions are completed (i.e.
www.vovida.org /pipermail/mgcp/2001-June/000656.html   (431 words)

 Definition: ringing signal   (Site not responding. Last check: 2007-11-05)
The alternating current (ac) component of the alerting signal.
An ac signal applied across the network interface (NI) of such magnitude, frequency, and duration to cause an electromechanical ringer to ring.
Used to alert the customer installation (CI) of an incoming call.
www.atis.org /tg2k/_ringing_signal.html   (59 words)

 LineTronic, PhoneRelay   (Site not responding. Last check: 2007-11-05)
When the phone rings the relay is activated with the same frequency as the telephones "ring" signal.
AutoMutic can be used to provide a digital signal to your own electronics, computer, etc. to signal telephone line condition.
Some newer telephones with memory etc. (typically using a power adaptor as power supply) only listen to the ringing signal and do not draw the normal 10-20 mA from the phone line when the phone is ringing.
www.lintronic.dk /AutoMutic.htm   (242 words)

When conditions for zero echo path are detected, the present embodiment bypasses echo cancellation by replacing the output signal with the input to the echo canceller.
In addition, the present embodiment also provides ringing and off-hook detections which additionally evaluate when the output should be replaced by the input to the echo canceller.
The system and method provides additional detection and control benefits to echo canceller (60) and can be implemented in echo cancellation systems without substantial change to the existing echo canceller.
wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=01/54382.010726&...   (236 words)

 Church bell ringing to signal start of parade | mountvernonnews.com
Church bell ringing to signal start of parade
Published: Friday, July 15, 2005 09:10 AM — Downtown Mount Vernon area churches and WNZR 90.9 FM, a broadcast ministry of Mount Vernon Nazarene University, are teaming up Saturday with an official bell ringing to signal the start of Mount Vernon’s Bicentennial Parade.
The bell ringing will begin at 9:55 a.m.
www.mountvernonnews.com /local/071505/bells.html   (147 words)

 155 Ringing Signal
The 155 Ringing Signal was a brand new accessory for Lionel in 1955.
It is based upon the popular 154 Highway Signal -- but with the addition of a ringing bell in in the based.
The 155 Ringing Signal has the following standard features: white or cream colored base (which houses the ringing bell) and fl strips, fl plastic post, fl crossbuck with white lettering and two flashing red signal lights.
www.postwarlionel.com /cgi-bin/postwar?ITEM=155   (297 words)

 [No title]   (Site not responding. Last check: 2007-11-05)
Redundant operation of ring voltage generators utilizing voltage bus segmentation for fault isolation
An apparatus for controllably supplying ringing signals to a plurality of telecommunication circuits comprising:
a plurality of electrically isolated ringing signal bus segments through which ringing signals applied thereto are delivered to one or more of said plurality of telecommunication circuits; and
www.uspto.gov /web/patents/patog/week44/OG/html/1288-1/US06813353-20041102.html   (69 words)

 Ringing - Oxford University Press: Ringing Endorsements
Tinnitus - Ringing in the Ears - Causes Symptoms and Treatments
Treatment suggestions for Tinnitus, that annoying ringing inside your ear disturbing your hearing.
Advance praise for the Jewish Study Bible from Oxford.
webinfosites.com /q/ringing.htm   (167 words)

 eBay - ringing crossing ..., Model RR, Trains, Toys Hobbies items on eBay.com   (Site not responding. Last check: 2007-11-05)
MINT Marx 418 Bell Ringing Crossing Signal OB 
MINT Marx 417 Bell Ringing Crossing Signal OB 
Use of this Web site constitutes acceptance of the eBay User Agreement and Privacy Policy.
search-desc.ebay.com /search/search.dll?query=ringing+crossing+...   (183 words)

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