JP3058684B2 - Cellular phone with standard phone set - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates generally to wireless telephones, and more particularly to a cellular telephone with a standard telephone set.

Today, cellular telephones operate with special purpose handsets coupled to cellular telephone transceivers via audio and data buses. To avoid the use of cellular radio channels during dialing and to minimize the cost of cellular telephone calls, a cellular telephone user dials a telephone number and then "sends" to make a cellular telephone call. (SEND) button (dial before calling). Pressing the "send" button causes the cellular telephone handset to generate a "send" signal and add it to the dialed digit sent to the cellular telephone transceiver.

Either a "send" button or circuit that simulates the "send" function if an equivalent machine, such as a traditional pulse or tone dial phone set or modem, is used in combination with a cellular phone There is a need for A "send" button can be added to a traditional telephone set by using the # or * buttons or a hookswitch flash, but both require additional circuitry and / or software on the interface device.

The "Send" button can also be simulated by detecting the end of a dial and generating a "Send" signal in a manner similar to that done automatically by cellular telephone handsets. Detecting dial end and automatically generating a "transmit" signal is disclosed in U.S. Pat. No. 4,658,096.
Nos. 4,737,975 and 4,775,997. According to these patents, an interface device detects the end of a dial and automatically adds a "transmit" signal to the dialed digit which is sent to a cellular telephone transceiver. However, to detect the end of a dial, such an interface device detects how many digits the dialed phone has and then actually receives the dialed number. Additional circuitry is required to count the number of digits. Thus, the addition of a "send" button or a circuit that simulates the "send" function as in the prior art described above requires additional circuitry and increases the cost and complexity of the cellular telephone. For these reasons, there is a need for a cellular telephone that does not require generation of a "transmit" signal.

OBJECTS OF THE INVENTION It is therefore an object of the present invention to provide a unique cellular telephone for use with a standard telephone set or equivalent to automatically generate and receive cellular telephone calls.

It is another object of the present invention to provide a unique cellular telephone that processes digits of telephone numbers dialed in any pattern in a standard telephone set or equivalent device.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a cellular telephone 100 embodying the present invention, to which standard telephone equipment 101 can be connected by a plug.

FIG. 2 is a flowchart illustrating the process used by microcomputer 108 in FIG. 1 to process dialed digits of a telephone number.

FIG. 3 is a flowchart of the process used by microcomputer 108 in FIG. 1 to handle an incoming telephone call.

FIG. 4 is a flowchart illustrating the process used by microcomputer 129 in cellular telephone transceiver 109 of FIG. 1 to receive dialed digits of a telephone number and place a telephone call to the dialed telephone number. It is.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a cellular telephone 10 embodying the present invention is disclosed.
A block diagram of 0 is shown, to which a standard telephone set 101 can be connected by plug. The cellular telephone 100 is advantageously used at a remote location to provide cellular telephone service to subscribers who cannot receive traditional landline telephone service. Telephone set 101 may be a traditional telephone facility or equivalent device with pulse or tone dialing. For example, telephone set 101 may be a desk set, a wall set, a modem, or a separate dial, ringer and handset of the type found in telephone booths. Telephone set 101 typically comprises a "tip ring wire (tip a
nd ring wirea) requires approximately 20 milliamps of operating current provided by the cellular telephone 100 via two wires 112. Telephone set 101 also typically includes a modular RJ11C-type plug 113 that mates with a corresponding modular RJ11C-type receptacle of cellular telephone 100.

Cellular telephone 100 includes a cellular telephone transceiver 109 having a wireless transceiver 119 and a microcomputer 119 having a memory therein for controlling its operation. The cellular telephone transceiver 109 may be any traditional cellular telephone transceiver having a wireless transmitter, a wireless receiver, and a logical unit, such as, for example, a DYNATAC cellular mobile 800MHZ transceiver. Motorola Instruction Manual No. 68
P81066E40, Illinois, United States 60196,
Schaumburg, East Angonquin Road 131
3, such as the transceiver shown and described in Motorola C & E Parts published and available.

Cellular telephone 100 also includes blocks 102-106 for interfacing cellular telephone transceiver 109 to telephone set 101.
including. Blocks 102-107 provide audio, voltage and dial signal interface circuitry for telephone set 101 and are of the type shown and described in Motorola's instruction manual number 68P81071E30 entitled "Cellular Connected Cellular Mobile Phone Intelligent RJ11C Interface". Motorola's instruction manual No. 68P810
71E30 is published and available from Motorola C & E Parts, 1313 East Algonquin Road, Schaumburg, 60196, Illinois, USA.

The voltage generator 107 generates a DC voltage of 48V, which is coupled to a wire 112 for supplying about 20 milliamps of current to operate the telephone set 101. Ring voltage generator 106 generates a ringing signal having a high voltage at a rate commonly used in telephone systems and is coupled to telephone set 101 via voltage generator 107. The rate of the ringing signal generated by ring voltage generator 106 is controlled by microcomputer 108 via control signal 116.

Audio circuit 102 is an electronic bridge circuit that converts the two-wire balanced audio from telephone set 101 to four-wire unbalanced audio, ie, the transmit and receive audio required in a dual telephone system. Convert. The 4-wire unbalanced audio from audio circuit 102 is coupled to a wireless receiver and wireless transmitter of wireless transceiver 119. The transmitted audio from audio circuit 102 is also coupled to DTMF detector 104.

Hookswitch detector 103 detects the transition of telephone set 101 from "on hook" to "off hook" or vice versa, and has a binary 0 state if telephone set 101 is on hook and telephone set 101 is off hook. In this case, a hook switch signal 117 having a binary 1 state is generated. During pulse dialing, the hook switch signal 117 from the detector 103 transitions from a binary 1 state to a binary 0 state for each dial pulse. The hook switch signal 117 from the detector 103 is coupled to the microcomputer 108 and the dial tone generator 105. The microcomputer 108 monitors the hook switch signal 117 from the detector 103 to determine when the telephone set 101 has gone off-hook or on-hook and to detect the digit of the dialed telephone number.

The dial tone generator 105 is a microcomputer 108
A dial tone is generated when the telephone set 101 goes off-hook in response to a control signal 115 from the telephone set and in response to a hook switch signal 117 from the detector 103. The dial tone is generated when the hook switch signal 117 from the detector 103 and the control signal 115 from the microcomputer 108 change to a binary 1 state. In response to the detection of dialing, the control signal 115 from the microcomputer 108 changes from the binary 1 state to the binary 0 state, and the dial tone generator 10
Shut off 5. In another embodiment, the dial tone is generated internally in the microcomputer 108 and is applied to the audio circuit 1 for application to the telephone set 101.
Combined with 02.

The DTMF detector 104 is coupled to the transmitted audio from the audio circuit 102 and detects the tone dialed digits of the dialed telephone number. Detector 104 may be a commercially available detector that converts dual tone multi-frequency (DTMF) tones into a 4-bit binary equivalent that is coupled to microcomputer 108 for processing. To make a selection between tone or pulse dial digits, the input signal to microcomputer 108 may be a binary 0 via a jumper wire or a user programmable switch depending on the type of telephone set 101 coupled to cellular telephone 100. Or they can be combined into a binary one.

A microcomputer 108 having a memory therein.
Controls blocks 105 and 106 and responds to and generates a cellular telephone call in response to hook switch signal 117 and dialed digits from telephone set 101. In response to receiving an incoming call, microcomputer 108 enables ring voltage generator 106 to ring telephone set 101. When a call is initiated by telephone set 101 going off-hook, microcomputer 108 decodes subsequent pulse or tone dial digits and, in accordance with the present invention, provides microcomputer 129 of cellular telephone transceiver 109 with a real-time base. Send each digit by Each dialed digit is stored by microcomputer 129. When the microcomputer 129 detects the absence of a dialed digit for a predetermined period of time, a cellular telephone call is automatically generated. Thus, by using the present invention, it is not necessary to detect a specific number of digits (eg, 7 digits for a local number and 10 digits for a long distance number) and generate a "transmit" signal as done in the prior art. No need to do. As a result, cellular telephone 100 can accept any dial pattern regardless of the number of digits in the telephone number.

In the preferred embodiment, the microcomputer 10
8 is coupled by a three-wire data bus 111 to a microcomputer 129 of the cellular telephone transceiver 109, the connection of which is illustrated and described in US Pat. No. 4,369,516. Microcomputer 108 essentially sees the dialed digits and sends each digit to microcomputer 129 on a real-time basis. Each digit detected by microcomputer 108 is encoded into a message and transmitted via bus 111 to microcomputer 129.
Microcomputer 129 receives each dialed digit from bus 111 and stores the received digit in a preselected location in its memory. If no other digit is received within a predetermined time (within 5 seconds in the preferred embodiment), the microcomputer
The digits stored in the pre-selected memory locations of 129 are transmitted over a radio transceiver 11 over a cellular radio channel.
Sent by nine wireless transmitters to initiate a cellular telephone call.

Referring now to FIG. 2, there is shown a flow chart for the process used by microcomputer 108 of FIG. 1 to process dialed digits of a telephone number. When you enter start block 202,
Processing proceeds to decision block 204 where a check is made of the hook switch signal 117 to determine if the telephone set 101 is off-hook. If not off-hook, a NO branch is taken and waits. If the telephone set 101 is off-hook, the YES branch is taken from decision block 204 to block 206 where the microcomputer 108
Generates a binary 1 state of control signal 115 to generate a dial tone. Block 206 is also reached via branch A when an invalid telephone number is dialed, as described below with respect to FIG. Next, block 208
A check is made to determine if the digit has been dialed. If not, a NO branch is taken and the call waits. If a digit has been dialed, the YES branch is taken from decision block 208 to block 210, where the binary 0 state of control signal 115 is generated and the dialed digit is encoded into a message and transmitted to the bus. It is sent to the microcomputer 129 via 111. Next, at decision block 212, the hook switch signal 117 is checked and the telephone set 1
It is determined whether 01 is still off-hook. If so, the YES branch is taken to decision block 208 and the previous process is repeated. If the telephone set 101 is not off-hook, a NO branch is taken from decision block 212 to block 214 to return to another task.

Referring now to FIG. 3, a flowchart is shown for the process used by the microcomputer 108 of FIG. 1 to handle an incoming telephone call. Upon entering start block 302, processing proceeds to decision block 304 where a check is made to determine if an incoming call has been received. If not, a NO branch is taken and waits. If an incoming call has been received, the YES branch is taken from decision block 304 to block 306, where microcomputer 108 generates a binary 1 state of control signal 116 to generate a ringing signal. Next, at decision block 308, telephone set 1
The hook switch signal 117 is checked to determine whether 01 is off-hook. If not off-hook, a NO branch is taken and waits. If phone set 10
If 1 is off-hook, the YES branch is taken from decision block 308 to block 310 to generate the binary 0 state of control signal 116, connect the call and then return to the other task at block 312.

Referring now to FIG. 4, the cellular telephone transceiver of FIG. 1 for receiving dialed digits of a telephone number and generating a cellular telephone call to the dialed telephone number.
A flowchart for the process used by microcomputer 129 at 109 is shown. Upon entering start block 402, processing proceeds to decision block 404, where a check is made to determine if a dialed digit has been received from microcomputer 108 in a message over bus 111.
If not, a NO branch is taken to wait. If a dialed digit has been received, a YES branch is taken from decision block 404 to block 406, where the 5 second timer is reset and started. In the preferred embodiment, a five second timer implemented by interrupt-based software is used to time the elapsed time since the last dialed digit was received. In other embodiments, such a timer may be implemented by a separate timing circuit and have a value that depends on the operating characteristics of telephone set 101. Next, at block 408, the received digit is stored at a preselected location in the memory of microcomputer 129. Next, at decision block 410, a check is made to determine if another dialed digit has been received. If so, the YES branch is taken from decision block 410 to block 406 to repeat the previous process. If no other dialed digits have been received, a NO branch is taken from decision block 410 to decision block 412, where a check is made to determine if the 5 second timer has timed out. If not, the NO branch is taken to decision block 410 to check if the next dialed digit, if any, has been received. If the five second timer times out, a YES branch is taken from decision block 412 to decision block 418 where the dialed digit is checked to determine if a valid telephone number has been dialed. For example, a dialed digit may have 7 digits for local numbers, 10 digits preceded by 1 or 0 for long distance numbers,
411 info, 611 about phone repair and emergency 911
Is checked to determine if there are three digits and if there are other digit sequences depending on the country in which the cellular telephone is being used and the telephone system. If the dialed digit is not valid, a NO branch is taken from decision block 418 to branch A, returning to the flow chart of FIG. 2 and generating a dial tone again. Thus, in accordance with a feature of the present invention, a dial tone is returned to the cellular telephone user if an invalid telephone number is dialed. If the dialed digit is valid, the YES branch is taken from decision block 418 to block 414, where the cellular telephone call is made to the microcomputer.
Generated for a number consisting of digits stored in 129 preselected memory locations, and then returns to the other task at block 416.

In summary, unique cellular telephones automatically generate and receive cellular telephone calls dialed in any pattern on a standard pulse or tone dial telephone set or equivalent device. The dialed digits of the telephone number are processed on a real-time basis by the proprietary cellular telephone of the present invention, so that the cellular telephone can be used without the use of circuitry to simulate a "send" button or "send" function as in the prior art. Make a telephone call automatically.

Continuation of the front page (56) References JP-A-63-78643 (JP, A) JP-A-63-39243 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04M 1 / 725 H04M 1/27 H04Q 7/38

Claims (5)

(57) [Claims] 1. A first plug means having dial means for dialing a digit of a telephone number, generating a hook switch signal indicative of an off-hook state and a dialed digit, and coupled to the hook switch signal. And a second telephone for coupling to a first plug means of the telephone device.
A cellular transceiver means for communicating a cellular telephone call and comprising a second microcomputer means and a memory means and operable by a cellular radio channel, and a data bus means having first and second ports. Wherein the first port is coupled to the cellular transceiver means, coupled to the second plug means for detecting an off-hook condition of the hook switch signal, and thereafter transmitting each dialed digit. First microcomputer means for receiving, said first microcomputer means being coupled to said first port of said data bus means and automatically receiving each received digit immediately after receiving said data bus means. The second microcomputer means transmits the data to the data processing apparatus. The transmitted digit is stored in the memory means coupled to the second port of the tabus means and the stored digit is stored when a time elapsed since receipt of the last stored digit exceeds a predetermined time interval. By automatically enabling all of the digits and automatically transmitting all of the stored digits over one of the cellular radio channels when the stored digit is enabled, the dialing is at least predetermined. A cellular telephone device in which all dialed digits of each telephone number are automatically enabled and transmitted when interrupted during a time interval of. 2. The cellular telephone further includes means coupled to said second plug means and said first microcomputer means for generating a ringing signal for ringing to said telephone device. 2. The cellular telephone device according to claim 1, wherein: 3. The cellular telephone device according to claim 1, wherein said cellular telephone further comprises means for generating a dial tone signal coupled to said second plug means and said first microcomputer means. . 4. The cellular telephone of claim 1 wherein said cellular telephone further includes means coupled to said second plug means for generating a DF voltage for powering said telephone device. apparatus. 5. The cellular telephone of claim 1, wherein said cellular telephone further includes means coupled to said second plug means and said cellular transceiver means for coupling an audio signal therebetween. apparatus.