AU601322B1 - Direct telephone-number selecting system - Google Patents

Description

AUSTRALIA

PATENTS ACT 1952 1 s Form COMPLETE SPECIFICATION

(ORIGINAL)

FOR OFFICE USE Short Title: Int. Cl: Application Number: Lodged: 1

L

Complete Specification-Lodged: Accepted: Lapsed: Published: Priority: Related Art: ihis- document contains the :amendments made under S:ction 49 and is correct for printing.

TO BE COMPLETED BY APPLICANT Name of Applicant: Address of Applicant: SAMSUNG ELECTRONICS CO., LTD NO. 416 MAETAN-DONG

KWONSUN-GU

GUWON-CITY

KYOUNGGI-DO

REPUBLIC OF KOREA GRIFFITH HACK CO., 601 St. Kilda Road, Melbourne, Victoria 3004, Australia.

Actual Inventor: Address for Service: Complete Specification for the invention entitled: DIRECT TELEPHONE-NUMBER SELECTING SYSTEM The following statement is a full description of this invention including the best method of performing it known to me:-

L-

TITLE OF THE INVENTION DIRECT TELEPHONE-NUMBER SELECTING SYSTEM BACKGROUND OF THE INVENTION The present invention relates to a direct telephone-number selecting system for use in a mobile radio telephone set and its control method.

0o o Generally, to make an outgoing call in the mobile telephone set, a "SEND" oo o key must be depressed at last after a ten-digit telephone-number composed of a oo oO 0Oo three-digit area code and a seven-digit subscriber number has, in turn, been .0oooo depressed. However, since the operation of such a lot of keys makes its use o 0 0o°° inconvenient and unsafe during the movement of vehicle, a prior art to solve such a problem was to store frequently-used telephone numbers at a G4* predetermined memory in the telephone set in advance and to dial the stored number by using a "RECALL" key. Even if such a prior art is employed in the mobile telephone set, since at least three or four times of keys, for example, 8 including a "RECALL" key, one or two of the stored-address numeral keys and finally a "SEND" key, should be successively depressed and its users should S note or know in advance the stored-address keys, inconvanience still remains as before.

SUWMARY OF THE INVENTION bin S2 Accordingly, it is an object of the present invention to provide a direct telephone-number selecting system within a mobile radio telephone set capable of dialing a desired subscriber with the operation of only one or two keys.

It is another object of the present invention to provide a direct telephone-number selecting method in a mobile radio telephone set capable of dialing a desired subscriber with the operation of only one or two keys.

Therefore, according to one aspect of the invention, there is provided a direct telephone-number selecting system for use in a mobile radio telephone set, comprising: a control unit having a first key-processing section responsive to a keypad on which a telephone-number to be called can be inputted, a first micro-computer unit receiving first keyed information from the first key-processing section, and outputting codes each representing one digit of the telephone-number to be called, a display section connected to the first micro-computer unit for displaying, at least, the inputted telephone-number, and an audio section connected to the first micro -computer unit for providing aural information relating to T z Of L 3 the operation of the said system; a logic unit for controlling operation of the system and having an internal memory which receives the codes from the control unit, whereby the system is firstly operable to make a telephone call by inputting a telephone-number on the keypad to cause generation of the same telephone-number from the logic unit, the internal memory also having a portion containing complete telephone-numbers which can be outputted in response to a single code resulting from a direct telephone-number selecting operation; and a direct telephone-number selecting unit having r rr $4 t o £t *E 1t O a second key-processing section responsive to a 15 plurality of single keys each representing a complete

C

l C telephone-number, a second micro-computer unit receiving the second keyed information from the second key-processing

C

S r section, and outputting a code representing the second keyed information, and a buffer receiving the code from the second micro-computer unit and outputting the code to the logic unit, the buffer being in parallel connection with the output of the first micro-computer unit, whereby the system is secondly operable by said direct telephone-number selecting, wherein a single key l

I

4 provides a code to the internal memory of the logic unit, this code having correspondance in the portion of the internal memory containing the complete telephone-numbers, such that a telephone call can be made by pressing only a single key.

According to a further aspect of the invention, there is provided a method of controlling a direct So"g^^ telephone- number selecting system, the system comprising 0.0 9 a control unit and a direct telephone-number selecting u.

0 e 10 unit both connected to a logic unit, the logic unit being 0 00ooo operable to output a telephone-number to be called in S° response to a nuimber of codes received from the control.unit or in response to a single code received from the direct telephone-number selecting unit, the method or 15 comprising the steps of: 0oo 0 00 in the control unit, 0 inputting first keyed information to a first micro-computer unit, the first keyed information corresponding to key strokes on a keypad in a first key-processing section, the keypad having numerical keys ti and instruction keys including a STORE key, and j. outputting a plurality of codes from the first micro-computer unit to the logic unit, each code representing one key on the keypad; in the direct telephone-number selecting unit, of\ -rrrci--- ~I inputting second keyed information to a second micro-computer unit, the second keyed information corresponding to a single key stroke on a keypad in a second key processing section, the single key representing a telephone number to be called, and outputting a single code from the second micro-computer unit via a buffer to the logic unit; in the logic unit, ooe¢ Q* receiving into an internal memory either a 10 plurality of codes from the control unit or a code from t the direct telephone-number selecting unit, if the reception is from the control unit determining if the codes contain a STORE instruction, and if so, writing the codes representing 15 numerical keys of the keypad into a fixed portion of the S memory, otherwise causing generation of the telephone number to be called in response to the codes representing numerical keys, or (ii) if the reception is from the direct telephone-number selecting unit accessing the fixed portion of the memory to cause generation of the telephone number to be called in response to that one code.

BRIEF DESCRIPTION OF THE DRAWINGS In order that the invention can be more clearly 3 R 4.o Z 0t-o~ understood, a preferred embodiment will now be described with reference to the accompanying drawings, in which: FIG. 1 is a schematic diagram showing configuration of the mobile radio telephone set in accordance with an embodiment of the present invention: FIG. 2 is a schematic block diagram of a direct telephone-number selecting system for use in the mobile o"so radio telephone set; and o° FIG. 3 is a detailed electrical circuit diagram 00e o "c 10 of a control unit and a direct telephone-number selecting unit according to FIG. 2.

0O D'0 0 0 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 illustrates a schematic hardware 44 t arrangement of the mobile radio telephone set according to the present embodiment. A transceiver unit 11 being 0 equipped in a trunk of vehicle, is coupled to an antenna 12 for transmitting and receiving a voice signal and various control signals to and from a cell site. A sub-set unit 13, comprising a cradle 15 and a hand-set 14 i coupled to each other with a curl cord 16 adjacent to a driver's seat, is coupled to the transceiver 11 by a connection cable as shown by the drawings. A direct telephone-number selecting (hereinafter referred to as "DTS") unit 17 preferably set near the driver's seat, is coupled to a transmitting terminal of the sub-set unit 13.

St 44.*

':J

5B The ROM 202 inlcudes therein a control program and data according to the present embodiment, while the RAM 203 stores therein provisional data produced from execution of -ne control program and has a memory area of a plurality of telephone numbers.

Referring to FIG. 2, there is illustrated a schematic block diagram of direct telephone-number selecting system that may advantageously be utilized in 00 0 o the mobile radio telephone set according to the present Soo 10 embodiment. A logic unit 200, which conveniently 0 constitutes a part of the transceiver unit 11 of the 09 40 0 mobile radio telepohone set, comprises a central processing unit (hereinafter referred to as "CPU") 201, a serial input-output unit (SIO) 205, a read-only-memory 0 i 15 (ROM) 202, a random-access-memory (RAM) 203 and a battery back-up circuit 204. Such a configuration is well known in the art. The logic unit controls general operations of all units of the mobile telephone system to a make a desired phone-call.

It is also well known in the art that the conventional mobile radio telephone set has a control unit 100 within the control unit 13. The control unit 100 includes a first key processing section 101 for performing' the operation of various keys and outputting a key data signal of each depressed key, a display section 103 for displaying various informations, and audio section 105 for K 0 ~bF 1. 5C voice communication with a called party, and a first micro-computer (hereinafter will be referred to as "MICOM") 102 for outputting to the logic unit 200 a first key information according to analysis of the key data signal received from the first key processing section 101 and for controlling operation of the control unit in response to the data received from the logic unit 200.

°o4S Preferably, the control unit 100 further comprises a b 00

OM

0 0 0 9 a a ae 0 co 9 O 0 O e oa7: o to 6 buffer coupled between the SIO 205 of the logic unit nd the first MICOM 182 so that it may protect interference of key data therebetween. Therefore, the control unit 180 performs a serial communication with the logic unit 208 to which data according to recognizing user's selection of various numeral keys, function keys and other buttons are transmitted. By processing the data received from the logic unit 280, the control unit controls various operations of the display section 183 and the audio section 185 to carry out a dsired phone-call according to the inveninR: emnbchdrent 0 009 °o oo A DTS unit 388, comprising a buffer 383, a second MICOM 382 and a second o o o oo0 key-processing section coupled in series, is connected to a transmitting 0 O° terminal (Tx) of the control unit 188 and generates key data to be used in a C O 9 0 U direct selecting operation of a desired subscriber's number in accordance with merbaz; menb the DTS system of the ee tn. The second key-processing section 381 generates a key-data signal used in dialing a desired subscriber's o a telephone-number by one stroke of key selection. The second MICOM 382, o coupled to the second key-processing section, outputs a second key information responsive to the key-data signal received, said second key information being used to provide the desired full phone-number according to the one stroke of key selection. The second buffer 383, coupled to the transmitting terminal Tx of the control unit 188 and the second MICOM 382, prevents the key data from interference and delivers the output of the second MICOM to the logic unit 288.

$1 A v' *i A- 2 f M A, FIG.3 shows a detailed circuit diagram of a preferred embodiment of the control unit 100 and the DTS unit 388 of FIG.2. The control unit 188 comprises the first key-processing section 181 including a decoder 111, a key matrix 112 and a plurality of inverters 113-115. Said first key-processing section decodes a key strobe signal so as to select sequentially rows of the key matrix 112 having a matrix arrangement of N-row by M-column (N x and upon depressing a key coupled to a corresponding row, generates a depressed key signal through the inverters 113-115 to input ports P28-P22 the first MICOM 182. Said first MICOM outputs the strobe signal to the first oo 0 0 0 0 o o key-processing section 101 as well as outputs to the logic unit 288 a first 00 0 00 So key information made in response to the depressed key signal received thereto, 0o 0O o 00 and in accordance with data provided from the logic unit, controls operations 0 0 of the audio section 185 and the display section 183. The first buffer 184, being coupled between the logic unit 280 and the first MICOM, comprises a o0 plurality of inverters 116, 117, a transistor 118 and a resistor 119. The inverter 116, coupled between the logic unit 288 and an input port P26 of the first MICOM, buffers the output data of the logic unit, while the inverter 117 and transistor 118 coupled in series between a transmitting and Tx and an K° output port P13 of the first MICOM, buffers the output data of the first M ICOM, thereby preventing the interference f key data transmitted to each other.

The DTS unit 388 comprises the second key-processing section 381 including a decoder 311, a key matrix 312, and a plurality of inverters 313-315, wherein the second key-processing section decodes a key strobe signal -8so as to select sequentially rows of the key matrix 312 having a matrix arrangement of Y-row by Z-column (Y x Z) and upon depresseing of a key coupled to a corresponding row, generates a depressed key signal through the inverters 313-315 to input ports P23-P25 of the second MICOM 302. Said second MICOM outputs the key strobe signal to the second key-processing section 301 as well as S' outputs to the logic unit 200 a second key information S' made in response to the depressed key signal received 10 thereto. The second buffer 303, coupled between the transmitting end Tx of said first buffer and an output port P13 of the second MICOM 302, comprises an inverter 316 and a transistor 317 in series, for preventing a reverse flow of output data of the second MICOM. Both 15 collectors of said transistors 118 and 317, that is, the Stransmitting end Tx, are in common coupled to a resistor S' 119 coupled to a source supply voltage Vcc.

Hereinafter, the operation of the DTS system according to the embodiment will now be further explained.

The mobile radio telephone set comprises the transceiver unit 11, the control unit 13, the DTS unit 17 and the antenna 12 as shown in FIG. 1. Said transceiver unit, prefereably disposed within a trunk of the vehicle, comprises a receiver for receiving a radio signal from a cell site, a transmitter for transmitting an outgoing radio signal to the cell site, a frequency synthesizer for making a frequency coversion, a power supply for providing Sa source supply voltage for every section of the telephone st Nn S-9a controller for controlling all the electrical operation in the transceiver unit. The control unit 13, preferably disposed just near the driver's seat, is connected to the transceiver unit 11 through a connection cable and is comprised of the handset 14 and the cradle 15. Preferably, in the handset is disposed each component shown in the control unit 188 of FIC.2, and in the cradle may be disposed a conventional speaker phone well known in the art.

Audio signals generated from the handset are delivered to the tinsceiver unit through an audio processing circuit (not shown) in the cradle. The control S unit transmits to the transceiver u'iit key data in response to the user's key selection, and then controls ti.e audio section 185 and the display section of the handset in accordance with data provided from the transceiver unit in response to the key data.

The DTS unit according to the present (r~Ig s, ispreferably disposed adjacent to the driver's seat,andis co'pled to the transitting end of the control unit through a 4-pin modular jack, wherein there are generated key data for carrying out a direct telephone-number selection for a telephone-number stored in advance by the user.

o When signals according to various functions and dialing of the mobile o C S- telephone system are to be generated in the first key-processing section 18' a key information representing a key depressed or selected is Llivered from the first key-processing section to the first MICOM 182 in which the key information is converted to a predetermined code according to a key table stored in advance, said code being supplied to the CPU 281 through the first 4.I 18 buffer 184 and the SIO 285. The first MICOM 182 is comprrised of an internal control program and a data memory, and performs serial comminiation with the CPU 281. Therefore, the CPU 281 inputs and outputs data through the SIO 285 through which data received from the first MICOM 285 are stored into the RAM 283 after a processing of the CPU, and data generated according to the processing are again delivered to the first MICOM 285. The first MICOM analyzes these data to control the display section 183 and the audio section.

Soo Operation according to a key selection by the second key processing o0o section of the DTS unit is almost same to that in the control unit 188 g explained above. After key information generated in the second key processing on section is converted into a prescribed code according to a key table stored in the second MICOM having an identical sequence with that of the first MICOM, it is then outputed through the second buffer 383. To make the CPU correctly o identify each corresponding key function selected, a key table (hereinafter c" referred to as "second key table") defining a set of key informations to be 4o*, generated by the second key-processing section 301 should have code values

OQ

different from those of a key table (hereinafter referred to as "second key table") defining a set of key informations to be generated by the first o key-processing section 181. Since the second buffer 383 is coupled to the a A 4 transmitting end of said control unit, in parallel connection, it does not receive any data but supply the key information to the SIO. Hence, when an user is to make a direct telephone-number selection for a desired subscriber, fcv-rhe hu tinanw^V s he has to put the corresponding telephone-number into the RAM 282 through the first key-processing section 181 i 11 of the control unit 188 and then generate the key information corresponding to said telephone-number by use of the second key-processing section 381 of the DTS unit 300.

Referring to the aforesaid description, the first and secnd MICOM 182, 382 are respectively comprised of internal masking ROM, data bus and input/output port, said masking ROMs each including therein a same control program. The control program comprises a first key-strobe program, a first o o00 key-processing program and a second key-processing program to execute the DTS 00 0 oo °o function, respectively. Accordingly, since the program areas used in the 00 0 0 0 MICOMs are identical to each other, each key-processing routine of both the o00000 0 control unit 100 and the DTS unit 388 is made with a same sequence, and oo a 0 0 a 0 9 thereby an independent key-processing of each key information can be taken by o making a distinction upon input port of each key information generated. The 0 a C 0 preferred embodiment is preferably constituted in such a manner that the 0 o 0 control unit and the DTS unit can execute each other function, independently, 00 0 0 and the logic unit can give a priority to a key firstly inputted thereto, in its processing sequence.

0 0 00 0 0 00 o Now, there will be further described a direct dialing sequence of a desired phone-number by using a single key selection. asso hd 4A ir"-nmi-i The RAM 203, which is preferably a non-volatile RfM, comprises a telephone-number memory map, for example, as shown in a following table (TABLE NO. 1).

STR<J s\ i f r) F 12 TABLE NO. 1 CLASS Address No. Function of Telephone-numbers A 80 For Hot-line Use B 81-89 For Sub-Hot-line Use C 10-50 For Ceneral Memory Dialing D 51-70 For DTS Use only E 71-80 For Receiving Messages I oo°o Referreing to the TABLE No.1, the telephone-numbers shown in the class A are to use in frequently-used or urgently-used subscriber numbers, which are S°o. read out by a "HOT" key in the first key matrix 182. In a similar manner, the Sr telephone-numbers shown in the class B are read out by a combination of 00 0t o "NUMERIC" keys and a "SEND" key and, those shown in the class C are read out by a combination of a "RECALL" key, "NUMERIC" key and a "SEND" key in 44 sequence, while those shown in the class D are read out by a single selection of the corresponding "HOT" keys (HOTI through HOT20) in the second key matrix o G 382 as shown in FIG.3. In addition, the class E is used to store any telephone-number called into the system, in sequence. Therefore, it will be °o understood that the telephone numbers in the class D are to be used in 0 60 extended urgent-lines. In the preferred embodiment, the various telephone-numbers to execute the function shown in each class of the above table should be stored into their corresponding memory area prior to its use. i Accordingly, the user should make a generation of a plurality of telephone-numbers to be stored and address information according thereto by 13 13 use of the first key matrix 112. The first MICOM 102 delivers sequential strobe signals from the output ports P14 to P16 and the decoder 111 decodes the strobe signals to thereby generate a row select signal to the first key matrix 112. By this, the first MICOM 102 checks each column state of the matrix 112 through the input ports P28 to P22 so that, upon generation of a key depressed signal, it acknowledges depression of the corresponding key from analyzing the states of the key strobe signals at that moment.

o o0 0000 00 0 S" Thereafter, the first MICOM 182 makes edited data 3dapted to a o o 0 0 S transmission form of data from the corresponding key value received, with 0o reference to a first key table stored in advance, of which one example is 0 5 shown in a below Table No.2.

oa o o Table No.2 a 0 0 0 0 03 o S0 0 aO o 0 G* Key Table Remarks Binary code Hexadecimal code 1 8000 0001 81H 2 0000 0818 82H 3 0008 8811 83H 4 0088 8188 84H 0000 0181 05H Numeric Keys 6 00888 8118 811 7 08808 111 07H 8 888 1808 8811 I 14 9 0888 1881 89H 8 8888 1818 8AH 0088 1811 OBH Special Keys 088 1188 8CH RCL 8111 1111 7FH RECALL key HOT 8111 1118 7EH HOT LINE key CLR 8188 0811 43H CLEAR key STO 8188 8081 41H STORE key ALP 8188 8818 42H ALPHABET key FUN 0111 1181 7DH FUNCTION key SND 8188 8188 44H SEND key MSG 8188 8181 45H MESSAGE key END 8188 8118 46H END key 00 0 o o o o 00o 0 0 0 000 0 1 a oat 0o o0 o 0 o a o o 0 0 i As mentioned above, the first key information generated from the first key matrix 112 is applied to the CPU 281 through the SIO 285, and then the CPU reads a program in the ROM 202 to process the input key data received thereto.

When the input key value amounts to that of a numeric key, it is checked whether the "STORE" key is depressed, wherein when there is no STORE key input, its corresponding numeric key data are stored into a memory area of key value in the RAM. However, when there is a STORE key input, there is set a flag of STORE key input in the RAM 283 and then theie is generated a tone corresponding to the STORE key. Such a tone signal is converted to serial data through the SIO, and thereafter is applied to the first MICOM 182 through the inverter 11G, thereby making the first MICOM 182 control the audio section 105 to generate an audio tone signal.

Ait this time of operating sequence, when there is inputed a numeric key in addition to the set state of the flag of STORE key inputting, the CPU regards the currently-inputted numeric key value as an address for a telephone-number storing area of the RAMl as shown in the Table No. 1.

Consequently, the CPU resets the flag of the STORE key inputting, stores for a talephone number a numeric key value inputted prior to inputting the 4 telephone-number storing area of the. RAMl corresponding to the 44 0 currently-inputted numeric key value, and then generates data for representing 0o these key values. After said data are converted to serial data by the SIO 285, they are also applied to the first MICOM through the inverter 116, thereby making the first MICOM control the display section 103 to display 4thereon the stored data. Such data displayed on the display section, are telephone-numbers according to the key input and an address of the telephone-number storing area of the RAM,'1 When the address stored amounts to othe class 1D (address No. 51-70) in the table No. 1. a direct telephone-number selecting operation by using a single key H 400444 i can be obtained. Therefore, the keying sequence for storing a telephone-number in the aforesaid description is as follows: a telephone-number comprised of a plurality of numeric digits; ii) a "STORE" key; and iii) an addres of two digits.

I- 16 Now, the operation of selecting a desired telephone-number by using a b e single key I nei -b r t .e iTm i.fn is explained. Said second key matrix 312 is comprised of twenty direct-dialing keys HOT1-HOT28, each of which corresponds, one by one, to each memory address (51-70) shown by the class D of the table No. 1 in the telephone-number memory area of the RAM 283. Said second MICOM 382 has a same key-processing program as that of the first MICOM 182, in which, when the sequential strobe signals come out from the ports P14-P16, the decoder 311 decodes the strobe signals to select a corresponding row in the second key matrix 312. Then, as a key depressed signal generates S".i from the second key matrix 312, the second MICOM 382 acknowledges the key depressed signal by the input port P23-P25 so as to identify a position of the S corresponding key.

o 4 Thereafter, said second MICOM 382 provides a coded output of the corresponding input key through the output port P13, by applying a second key table (Table No. 3) as follows.

o 0 3 0 0 Table No. 3 ::t o 00 0 0 4 0 00 00. *-Ja Key Table (binary) Hex code HOT 1 0181 8088 58H HOT 2 0181 8001 51H HOT 3 8181 8818 52H HOT 4 4 801 8011 53H HOT 5 8181 0188 54H HOT 6 8181 8181 ii; -U~ 17 HOT 7 HOT 8 HOT 9 HOT18

HOTII

HOT12 HOT13 HOT14 HOT15 HOT16 HOT17 HOT18 HOT19 HOT2

END

0181 8101 8101 0181 0110 8118 8118 8118 0118 8118 0118 8118 0118 8101 8188 8118 8111 1888 1001 1881 000 0881 8010 8811 0188 0181 8118 8111 1000 1881 8118 0 00 00 0 00 0 0 00 0 00 0 O0 00 0 0 0O 0 0 00 o oo ,L 0o o 0 00 00 00 00 0 0 0* 0 0 0 00 00 0 0 00 0 00 0U 0 0, 0 0 0 00, r Consequently, said second key information is buffered (or amplified) i.

the inverter 316 and the transistor 317 to be then applied to the SIO 285.

This is to eliminate the interferencing action between the first key information of the control unit 188 and the second key information of the DTS unit so that the malfunction of either one of the control unit and DTS unit does not affect the operation of other side. Since the CPU 281, receiving said second ke2 information through the SIO 285, has independent key values, it evaluates an inherent address according to the corresponding DTS key input.

Then, the CPU makes an access to a telephone-number of the address in the 1-18 telephone-number memory area of the RAM 203 to make display data. These display data for DTS unit are converted into serial data by the SIO to be applied to the first MICOM through the inverter 116, and the first MICOM controls the display section 103 to display as follows.

DXX XXX XX i telephone number SAddress number DTS function display o 00 o .0 In addition, the CPU 281 reads out the access data, that is, a telephone-number for DTS function to convert into a radio-frequency (RF)-transmitting data format, which are stored into a RF-transmitting data S area of the RAM. These RF-transmitting data is delivered to the transceiver unit 11 for transmission. The transceiver unit modulates the data for transmitting into a cell site by using the antenna 12. Therefore, it will be S understood that an outgoing call to the corresponding telephone number, stored in a predetermined address of the RAM according to a single key selection in the second key matrix, can be achieved conveniently.

In the interim of using the second key matrix for making a call, it will be possible to cancel the call, if needed, by applying a "CLEAR" key in the first key matrix. For a end of the call, there is used an "END" key, which is respectively disposed at both the first and second key matrices, each key value of said END keys having a same coded value as shown in the tables No.2 _I 1_ S-19 and No. 3. Therefore, in use of a hand-free function, it will be possible to end the call only by using the keys with the DTS unit without the handset.

When the user desires to change the content of telephone-number memory for DTS operation, he will be able to input a new telephone-number and its corresponding address number in the memory by applying again the "STORE" key in the first key matrix.

oo As apparent from the aforementioned description, °e o 10 since a user of the systemm stores into a memory a 0 'plurality of telephone numbers of subscribers used 0o frequently and thereby makes a desired call from the °0 direct teleophone-number selecting by applying a single key depression upon the desired subscriber, a driver may be able to achieve more safety and convenience upon I r "driving and calling. Furthermore, much convenience on its 0oo use will be obtained, because the END key is disposed on both the DTS unit and the control unit, which makes it possible to make an end of call through the DTS unit without using the handset during the use of hand-free operation.

Cc L I

Claims (5)

1. A direct telephone-number selecting system for use in a mobile radio telephone set, comprising: a control unit having a first key-processing section responsive to a keypad on which a telephone-number to be called can be inputted, a first micro-computer unit receiving first S0°o keyed information from the first key-processing section, 00 o °oo and outputting codes each representing one digit of the 0 0 telephone-number to be called, a display section connected to the first micro-computer unit for displaying, at least, the inputted telephone-number, and an audio section connected to the first micro -computer unit for providing aural information relating to O the operation of the said system; a logic unit for controlling operation of 0o the system and having an internal memory which receives a 00 the codes from the control unit, whereby the system is firstly operable to make a telephone call by inputting a telephone-number on the keypad to cause generation of the same telephone-number from the logic unit, the internal memory also having a portion containing complete telephone-numbers which can be outputted in response to a single code resulting from a O zL 21 direct telephone-number selecting operation; and a direct telephone-number selecting unit having a second key-processing section responsive to a plurality of single keys each representing a complete telephone-number, a second micro-computer unit receiving the second keyed information from the second key-processing section, and outputting a code representing the second keyed information, and S' a buffer receiving the code from the second micro-computer unit and outputting the code to the logic unit, the buffer being in parallel connection with the output of the first micro-computer ?unit, 00,. i whereby the system is secondly operable by said direct telephone-number selecting, wherein a single key provides a code to the internal memory of the logic unit, this code having correspondance in the portion of the internal memory containing the complete telephone-numbers, such that a telephone call can be made by pressing only a single key.

2. A direct telephone-number selecting system as claimed in claim 1, wherein the co:ntrol unit also comprises a buffer which receives the codes from the first micro-computer unit, then outputs the codes in parallel with any code from the buffer of the direct telephone- L' 22 number selecting unit to the logic unit.

3. A direct telephone-number selecting system as claimed in either one of claims 1 or 2, wherein a buffer comprises a logic invertor coupled to the base terminal of a transistor whose collector provides the output to the logic unit.

4. A method of controlling a direct telephone- o*number selecting system, the system comprising a control 0oo 0: unit and a direct telephone-number selecting unit both Oe 0 a o0 °B connected to a logic unit, the logic unit being operable So 0 to output a telephone-number to be called in response to a 04 00 S0 number of codes received from the control.unit or in response to a single code received from the direct telephone-number selecting unit, the method comprising the 0,00 steps of: 0 a00 04 in the control unit, 00 inputting first keyed information to a first micro-computer unit, the first keyed information o° corresponding to key strokes on a keypad in a first 0 «0 key-processing section, the keypad having numerical keys and instruction keys including a STORE key, and outputting a plurality of codes from the first micro-computer unit to the logic unit, each code representing one key on the keypad; in the direct telephone-number selecting unit, +Y 23 inputting second keyed information to a second micro-computer unit, the second keyed information corresponding to a single key stroke on a keypad in a second key processing section, the single key representing a telephone number to be called, and outputting a single code from the second micro-computer unit via a buffer to the logic unit; in. the logic unit, °a receiving into an internal memory either a 0a Soct plurality of codes from the control unit or a code from 0004 o a I the direct telephone-number selecting unit, o o 4 0 6 0 if the reception is from the control unit determining if the codes contain a STORE Instruction, and if so, writing the codes representing o0t numerical keys of the keypad into a fixed portion of the 0 4 I memory, otherwise causing generation of the telephone o number to be called in response to the codes representing numerical keys, or (ii) if the reception is from the direct telephone-number selecting unit accessing the fixed portion of the memory to I cause generation of the telephone number to be called in response to that one code, A system as claimed in any one of clais; 1-3, and substantially as herein described with reference to any one of the examples shown in the accompanying 24 drawings.

6. A method as claimed in claim 4, and substantially as herein described with reference to any one of the examples shown in the accompanying drawings. DATED THIS 2nd DAY OF July, 1990 SAMSUNG ELECTRONICS CO., LTD By Its Patent Attorneys GRIFFITH HACK CO. Fellows Institute of Patent Attorneys of Australia II C O I l