Intellicall telephone amplifier

Effective date : Year of fee payment : 4. Year of fee payment : 8. Owner name : H.

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Intellicall telephone amplifier

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• Technical Details
• US5133005A - Line powered pay telephone with power management - Google Patents
• dr martens dolls kill 1b60 maxview geotagged photos on map
• Protel Intellicall Blue & Silver Elcotel Details about PAYPHONE Volume Control Button
• Robot or human?
• ⓘ Payphone
• Korecall 4 0 Voice Logger System
• Serene Innovations RF2001 Cell Phone Signaler

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Technical Details

Effective date : Year of fee payment : 4. Year of fee payment : 8. Year of fee payment : A line powered telephoe is disclosed in which the telephone is not powered from a separate external source. The improved pay telephone is powered solely by loop current available on the telephone line from the central office.

A rechargeable battery is provided to store excess loop current to enable operation of the pay telephone when not off-hook to the central office. Power consumption by components of the telephone is minimized by shutting down unnecessary functions on a selective basis to ensure that sufficient excess loop current is available to recharge the battery. In addition, an improved switched-capacitor circuit is disclosed to enable storage of electricity at a voltage potential higher than the off-hook line voltage to enable firing of standard high voltage relays for coin collection and coin return.

More specifically, this invention relates to a coin-operated customer owned telephone COCOT which, by its nature, does not rely upon signalling from the central office of the telephone company to provide call rating and coin collection information to the individual telephone instrument.

Pay telephones controlled by the central office of the telephone company are well-known in the art. Early pay telephones required operator intervention to give the caller information about the cost of a call and to determine whether the necessary money was inserted into the telephone. The operator could control the initiation and continuation of the call as well as send signals to the coin telephone to collect or refund the coins in the phone.

Subsequent advances in the field have involved automation of the call rating and collection by computers associated with the central office. More recently, it has become legal for individuals to own and operate pay telephones COCOTs not owned by the telephone companies. In order for these phones to operate, the intelligence necessary to rate calls and control the collection of coins and the actual connection of the calls has to be controlled by computer circuitry within the telephone, rather than signals from the central office.

Also, prior art pay telephones generally required an independent power source supplied at the site of the telephone. However, line-powered telephones have been designed which enable the pay telephone to obtain the necessary operating power from the telephone line itself. An example of a prior art line-powered telephone is that described in U. This patent describes a line-powered pay telephone which is connected to a coin trunk.

The device disclosed in U. Because of its limitation to line current in the on-hook condition, since such current is limited by law to five microamperes, minimal circuitry can be powered by the line. Furthermore, since this instrument is connected to a coin trunk, it generally relies upon the central telephone office to provide the current to the coin collect relay in the off-hook condition, with a battery powered option for the coin collect in those situations where the central office current is not available to operate the coin collect relay.

The battery described in the Mellon patent is not used in the on-hook condition and is only used to provide a high energy pulse to the escrow relay. It is desirable to provide a line-powered coin telephone which is capable of being used as a COCOT, and not on the coin trunk.

Such telephones are not able to use the telephone company's central office to provide escrow relay signals. Therefore, it is desirable for such a system to have the capability of internally generating coin escrow relay signals as needed. Batteries are not sufficiently reliable to ensure adequate current will be available each time a coin relay signal is required.

Furthermore, it is desirable to provide a line-powered COCOT which has the capability of being self-powered in the on-hook condition so that it has sufficient power necessary to maintain computer memory as well as to power-up the telephone to make calls during alarm conditions. The power provided by the line, alone, when the telephone is in the on-hook condition is not sufficient to provide these capabilities.

The present invention relates to a line-powered pay telephone in which the telephone is not powered from any separate external source. When the phone is in the on-hook idle condition, the memory, the real time clock RTC , and the wake-up circuitry are powered by a rechargeable battery. When the handset is on the hookswitch, the telephone's microprocessor and associated circuitry are powered down. In the powered down condition, the battery is able to maintain the essential circuitry for an extended period of time.

When the handset is lifted from the hookswitch, the wake-up circuitry causes the microprocessor to power-up. Once the microprocessor is powered-up, current flows from the telephone line causing an off-hook condition to appear to the Central Office CO.

The telephone can then be powered from the telephone line. During the off-hook condition to the CO generally while the telephone call is in progress the rechargeable battery is charged with the difference between the current from the telephone line and the current that the telephone is using. The telephone is provided with means for maintaining a battery in the charged condition, means for minimizing power usage by shutting down any unnecessary operation of functions, and means for storing a sufficient charge for use in firing the coin relay of the pay telephone.

Therefore, it is an object of the present invention to provide a pay telephone which relies for operation solely on the power which may be legally utilized from the telephone lines when the phone is in the off-hook condition by minimizing the power usage when the telephone is on the on-hook condition and by storing excess available power during the off-hook condition in a rechargeable battery.

It is another object of the present invention to provide a pay telephone which charges a battery in the off-hook condition, for providing power in the on-hook condition, by charging the battery with the excess permissible current while selectively causing the average current used by the telephone during the off-hook condition to be sufficiently below the permissible current such that the battery may be maintained in a charged condition.

It is yet another object of the present invention to provide a pay telephone whereby electronic circuits are collectively powered down by the microprocessor during the off-hook condition such that sufficient excess average current is available for charging a battery in the phone. The preferred embodiment is now described with reference to the drawings. The present invention, as shown in FIGS.

The telephone of the present invention requires no connection to an external power source. All power for the telephone is derived from loop current flowing through the tip and ring conductors from the CO and through the telephone. In the off-hook condition, the telephone is powered directly from the telephone line. Power usage is minimized in the off-hook condition by shutting down all non-essential circuitry when not being utilized.

A rechargeable battery B1 is charged with the difference between the current from the telephone line and the current that the telephone is using. In the on-hook condition, the battery B1 provides the current necessary for operating the telephone.

The particular features of the circuitry of the present invention are now described with reference to the various operational conditions of the telephone. In the on-hook condition, i. Since these devices are all CMOS, only a very low current, approximately 40 microamperes, is necessary to maintain the telephone during the on-hook condition. The Real Time Clock U7 functions at all times.

Once an hour a wake-up signal from the Real Time Clock U7 causes microprocessor U1 to be powered-up for approximately 1 millisecond to check all alarms. If all of the alarms are off, the microprocessor U1 powers down to resume its off-standby state. If any of the alarms are on, the microprocessor U1 is programmed to cause the telephone to "call home" to report the problem. When a wake-up signal RTCTICK is received while the microprocessor U1 is in the off-standby state, the microprocessor U1 will power-up fully and proceed according to its program.

The microprocessor U1 will also wake up if any of the following events occur: a closed condition is detected from the hookswitch S10, an incoming ring signal RI is received, or if the cash box is removed. For example, if the wake-up signal is the signal OFFHOOK caused by lifting the handset off of the hookswitch, the telephone will assume the off-hook condition as described later.

The current drawn from the battery B1 to keep the essential memory and clock functions is typically about microamperes. Power consumption increases on wake-up, when the microprocessor U1 powers-up for approximately 1 millisecond. For example, during the hourly wake-up by the Real Time Clock U7, power consumption increases to approximately 30 milliamperes.

Preferably the battery B1 is a lead acid battery having low current loss. As a result, the battery B1 will only discharge after a long period of non-use. In any given hour period, the average current supplied by the battery B1 to operate the telephone is about 20 microamperes.

The telephone goes into a powered-up condition internally before possibly going off-hook to the Central Office CO. An internal powered-up condition is generated in one of four ways:. This condition occurs every hour, as described with reference to the on-hook powered-down condition above;.

In any of these cases the power-up circuitry U60 is enabled. The power-up clear signal PUC is normally low and will go high when at least 4. Preferably, the signal PUC is provided with positive feedback to prevent oscillations. When reset signal RST goes high and the microprocessor U1 starts operating, the microprocessor U1 will check to see what caused the wake-up. The keypad constant current source I kp , which supplies approximately 15 milliamperes of current, is turned on.

Analog switch U12A between the keypad K1 and the earpiece M2 is enabled so that the user can hear his own digits being dialed. Then line mute analog switch U12B is enabled so that the user will be able to hear the dial tone through the earpiece. Off-hook relays K1 meaning the switch between contacts 7 and 8 of relay K1 and K2 are closed to cause the telephone to go off-hook to the CO.

The CO will detect the off-hook current and will send a dial tone to the telephone. At this point, the user can dial digits and hear the digits that he dials.

The microprocessor U1 will detect the digits and store them for processing. The user can also deposit coins in the coin box of the telephone, wherein the microprocessor U1 will detect the coins deposited and process that information. The rechargeable battery B1, which provides power to the telephone in the on-hook condition, is charged sufficiently by the excess current available during the off-hook condition. The electronic inductor U51 allows DC current to pass, while presenting a high impedance to AC signals.

The DC current passes to the battery voltage charge circuit U52, which consists of a shunt regulator D6 and two resistors R89 and R The shunt regulator D6 functions to regulate the voltage at its cathode by shunting current when the voltage at its gate reaches approximately 2. The two resistors R89 and R90 are chosen so that the regulated voltage at the cathode is approximately 6.

Loop current will flow through relay K1 and into battery B1 if its voltage is less than approximately 6. Capacitor C30 is preferably a 0. Diode D7 prevents current from flowing back into the battery voltage charge circuit when the telephone is on-hook. In the off-hook condition, current flows through diode D7 if the voltage on the battery B1 is less than the voltage across the battery voltage charge circuit.

While the telephone is in the off-hook condition, the battery B1 is charged with the difference between the line current from the Central Office telephone line and the current that the phone is using. If the battery B1 is fully charged to 6. Battery B1 will then be utilized when the phone is in the on-hook condition. As described above, the power-up circuitry U60 initiates a power-up of the microprocessor U1 when the telephone goes off-hook.

The first gate array provides decoded memory addresses for program, voice, rates and system RAM memories. The first gate array also provides a watchdog function and latches.

The watchdog function is used to reset the microprocessor U1 should the microprocessor U1 not address the watchdog within a period of 8 seconds. If the microprocessor U1 is not addressed, the watchdog will bring the reset line to the microprocessor U1 low for 8 seconds and then high.

The gate array includes input buffers for alarms, wink and reverse battery detection, coin-in detection, DTMF strobe, and coin voltage detection.

US5133005A - Line powered pay telephone with power management - Google Patents

Because we are a major distributor for some products, we price very aggressively by sacrificing profit margin whenever we sell in bulk. The philosophy to offer quality products with little mark up has created unmatched customer loyalty for some successful membership based stores. Unlike those wholesale to public membership clubs, we do not charge any membership fee. Some merchants offer FREE shipping, but when you buy quantity 10, you pay 10 times total. Essentially, you are paying 10 times on shipping. We don't think that is fair to you.

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A payphone is typically a coin-operated public telephone, often located in a telephone booth or in high-traffic outdoor areas, with pre-payment by inserting money or by billing a credit or debit card, or a telephone card. Prepaid calling cards also facilitate establishing a call by first calling the provided toll-free telephone number, entering the card account number and PIN, then the desired telephone number. By agreement with the landlord, either the phone company pays rent for the location and keeps the revenue, or the landlord pays rent for the phone and shares the revenue. Payphones are often found in public places to contribute to the notion of universal access to basic communication services. One thesis, written as early as , recognised this as a digital divide problem. In the 20th century, payphones in some countries, such as Spain, used token coins, available for sale at a local retailer, to activate pay phones, instead of legal tender coins. In some cases, these were upgraded to use magnetic cards or credit card readers over the years. In the past, payphones were ubiquitous worldwide, but their prevalence has decreased significantly over the years due to the increasing availability of mobile phones, even though cell phone service is not always available in emergencies. The payphone model 23, introduced at Deutsche Bundespost Telekom in , is an electronic software-controlled payphone for analog connections. It is equipped with coin, German: Munzspeicherwagen, and integrated test program setting.

Protel Intellicall Blue & Silver Elcotel Details about PAYPHONE Volume Control Button

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For people with low vision and mild to moderate hearing loss Amplifies incoming sound up to. Show more. See Also : Telephone amplifiers for the hard of hearing Show details. Preview 4 hours ago Cellphone, Corded and Cordless landline phone amplifiers. Shop Now.

ⓘ Payphone

This project probably started due to my odd obsession with quarters and coin operated devices. I guess that the legends of the golden days of hacking and phreaking helped too. Added to the fact that my cordless phones were never to be found when needed. So the decision was made I needed a corded phone. After running a across a few look a like phones, I thought they looked cheap.

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November 12, , pm. Home Help Search Login Register. Send this topic Print. Author Topic: payphone for gameroom

Your question might be answered by sellers, manufacturers, or customers who bought this product. Please make sure that you are posting in the form of a question. Please enter a question. Now the hard of hearing or any telephone user can enjoy louder, clearer calls and more comfortable phone conversations. In addition to the volume boost, the amplifier has several features that improve and enhance your listening experience.

The Ameriphone Portable Telephone Handset Amplifier, model HA40, is a handset amplifier designed for use by individuals who are hard of hearing. This unit increases incoming sounds up to 40 decibels dB. The hearing-aid compatible device is compatible with most home and office phones and connects between the handset and the phone base.