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1 USOO A Ulllted States Patent [19] [11] Patent Number: 5,850,436 Rosen et al. [45] Date of Patent: Dec. 15, 1998 [54] COMMUNICATION BETWEEN A Primary Examiner Krista Zele TELEPHONE AND A COMPUTER SYSTEM [75] Inventors: P. Bradley Rosen, Weston, Mass.; Lee D. Weinstein, Somerville; Michael A. Bromberg, Mason, both of NH; Glen Assistant Examiner Jacques Saint-Surin Attorney, Agent, or Firm Paul N. KatZ [57] ABSTRACT A method and apparatus provide communication in a tele R- Dash> Concord> Mass- phone system connected to an external phone line, Wherein [73] the telephone system has a telephone line, a telephone, a Asslgnee: gompaq gomputer Corporatlom phone interface unit coupled to the telephone and the ouston, ex. telephone line, a computer system, and a computer interface unit coupled to the computer system and the telephone line. [21] Appl. No.: 702,151 Abias voltage on the telephone line is detected to determine _ if the tele hone is on-hook or off-hook, a rin in volta e on [22] Flled: Aug the telephicjme line is detected to determine ifin gxternagl call [51] Int. Cl?..... H04M 9/02 is incoming, and a?rst Carrier transmitted by the phone [52] US. Cl /377; 379/9301; 379/212; inferface unit is deteeted- A Carrier is transmitted 379/350; 379/399 using the computelrd interface flliltllt ILnder cpntrol of 'the _ com uter s stem. etection o t e 1as vo ta e, r1n in [58] Field of Search /377, 93.09, vohfge, and??rst Carrier is Communicated to thge compgutegr 379/67 93' system. An off-hook condition is indicated if the line bias ; 455/ voltage is less than an off-hook bias threshold voltage. An incoming ring is indicated if the ringing voltage has an [56] References Cited amplitude greater than a?rst voltage and a frequency in the US PATENT DOCUMENTS range of a ring frequency. The?rst carrier is indicated as being present if a signal is detected at a?rst carrier center /1986 Cohen /9305 frequency and having an amplitude greater than a?rst 4:686j699 8/1987 W?kie 379/9305 carrier threshold voltage. The second carrier is indicated as /1994 Sainton _ 379/9305 being present if a signal is detected at a second carrier center 5,369,687 11/1994 Farkas..... _ 379/9305 frequency and having an amplitude greater than a second /88 carrier threshold voltage. 5,392,334 5,471,522 11/1995 2/1995 O Mahony Sells et al. 379/9311 5,594,788 1/1997 Lin et al / Claims, 21 Drawing Sheets PHONE JACKS JB JC TIP 300 ( I 3%) I PROTECTION PARALLEL HOOK RING DETECT LOOP HOLD HYBRID DETECT P \330 RING ( H 328 RCVAUD XMITAUD MODAUD 346 CARRIER f CURRENT 4 O EDEMOD MODEM RINGDET SERIAL * PORT SEIZE > AUDIO1B V_Ai3 [ UART MUX 316 MONITOR 34s v Lg?gggkg I OFFHOOK : AUDIN XMITENB 0i CODEC cxo? [10 345A MUX1 : :] H T >\Z_E _ >MODAUD \ 4_ EL :F 1 [L]JB ELB ' 350 [3'

2 U.S. Patent Dec. 15,1998 Sheet ,850, I 7 00 MPU T ER \ I 106 l r102 CIU POINT OF PM El PM by RE PIgéNE DEMARCATION 124B 124A 126 ' l FJ~113G~116 G-122 J (TEL co_ HOUSE : c l J "IWIRE I WIRE I \ 10 FIG. 1 POINT OF fé'gl COMPUTER 110 L) ) 102 1% E15 P U 5231A \ C'U 131D DEMARCATION 124B 124A Ea] L TEL col HOUSE L )WIRE I WIRE I E U U G FIG. 2 I J

3 U.S. Patent Dec. 15,1998 Sheet 2 0f 21 5,850,436 12(58 AC UTILITY WIRING I COMPUTER POINTOF P'U J J DEMARCATION 110i l G 118 U IIS GAIZZ TEL co_ HOUSE I I I IWIRE I WIREI FIG. 3 PIU CIU POINTOF DEMARCATION 100 I COMPUTER I I 102 C'U 112 ~ 110 ~ I 136 EI U TELCO NIU HOUSE 1 l I WIRE) I WIRE I INTERCOMMUNICATION I 138 FIG. 4

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6 U.S. Patent Dec. 15,1998 Sheet 5 0f 21 5,850, ( ( CPU MEM CPU-PCI 732 BRIDGE 736 PCIBUS ( PCl-ISA BRIDGE s ISA BUS ( SA SLOT l 754 FLASH ROM l/o CHIP UART w756 K 748 PARALLEL MOUSE SERIAL H758 ( L FIG. 7

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8 U.S. Patent Dec. 15,1998 Sheet 7 0f 21 5,850,436 POWER-U P PC_ N TC U OR PC_STARTC U INACTIVE ( 4, IDLE STATE PC_GO_ NACT VE STATE OFF-HOOK ON-HOOK CXD_ END OF CALL PC_SEIZE_L NE v POTS CALL ACTIVE STATE PC_SE ZE_LINE (PCA) FLASH-HOOK HW TO POTS HW PC_UNSEIZE_L NE CALL EVENT VOICE MODEM PC $E ZE _ NE HW CALL ACTIVE STATE T " ACTIVE STATE (VMA) FIG. 9A

9 U.S. Patent Dec. 15,1998 Sheet 8 0f 21 5,850,436 TO IDLE STATE ON-HOOK!CXD_ POTS CALL ACTIVE (PCA) FLASH_QUALlTY FLASH-HOOK To HW_CA OFF TO IDLE STATE HOOK ON-HOOK PC_SEIZE_LINE POTS ACTIVE HW_TO_POTS_CALL_EVENT FROM HW_CA To VMA PC_UNSEIZE_LINE FIG. 98 FROM PCA FLASH-HOOK HW CALL ACTIVE TIMEOUT FLASH-HOOK : RING-COUNT-ROLLOVER HW RE EsT > QU I PC_GO_POTS f OFF-HOOK I ON-HOOK / ' % W To [DLE STATE v PC_HW_CALL_ACK >-TO PCA ON-HOOK \ OFF-HOOK + HW ACTIVE \ FLASH-HOOK RING-COUNT-ROLLOVER PC_GO_POTS ' TO VMA PC_SE ZE_L NE FIG. 9C

10 U.S. Patent Dec. 15,1998 Sheet 9 0f 21 5,850,436 SPEECH COMMAND 408 RECOGNIZER MANAGEMENT 410 % APPLICATIONS % A420 SPEECH 3N5 DATA FLOW MANAGER J 4_05 423A MMSYTEMDLL TAPLDLL E~ 430 f 4} [ WAVE J [ TAPI DRIVER SERVICE PROVIDER O3 426 DRIVERS 424 [ ASYNC VxD l 592 DRIvER SUBSYSTEM 428 L /\ IL lr xv/ VCOMM, A YNC PORT DRIvER, AND H "-éf---<'t " LI V ( CIU FIRMWARE ) % CIU FIG. 10

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12 U.S. Patent Dec. 15,1998 Sheet 11 0f 21 5,850,436 ENDLISTEN ENDLISTEN ENDLISTEN HANGUPPOTS HANGUPHOMEWIRE ANSWERHOMEWIRE ANSWERPOTS OURPOTSCALL OURHOMEWIRECALL FIG. 12

13 U.S. Patent Dec. 15,1998 Sheet 12 0f 21 5,850,436 MAIN LOOP FOR HW_DEVICE HIDDEN WINDOW 550 WINDOWS MESSAGE RECEIVED WM_ALERT MESSAGE? DOALERT WM_TSPEVENT 558 I TS P_CALLBACK II ( RETURN TO WINDOWS)= EXECUTE DEFAULT WINDOWS PROCEDURE A560 FIG. 13

14 U.S. Patent Dec. 15, 1998 Sheet 13 0f 21 5,850,436 READ STATUS REGISTER 562 l POTSRINGCHECK 564 l HWRINGCHECK " 566 l OFFHOOKCHECK ' 568 l ISSUE COMMAND A570 FIG. 14

15 U.S. Patent Dec. 15,1998 Sheet 14 0f 21 5,850,436 IRINGING lrlnging & (RING COUNT DOWN = O) FALSE FILTER POTS RINGING RING COUNT DOWN = 0 FIG. 15

16 U.S. Patent Dec. 15,1998 Sheet 15 0f 21 5,850,436 HWRING IDLE HWRINGING!HWR NG NG FALSE RING HWRINGING & IOURHOMEWIRECALL HWFALSE FILTER HWRINGING & (RING COUNT DOWN = 0) HWRINGING & OURHOMEWIRECALL HWRlNGlNG WAIT FOR HANG UP FIG. 16!HWRING NG & (PERIODCOUNTDOWN = 0)

17 U.S. Patent Dec. 15,1998 Sheet 16 0f 21 5,850,436 6 z>>oahzzoozwilv.m xoozkg " XOOIHEO IO xooi

18 U.S. Patent Dec. 15,1998 Sheet 17 0f 21 5,850,436 TIME-OUT SOFTWARE TERMINATED SNV TERMINATION CI U U NAVAL PC INITCIU OR PC_STARTCIU ACKNOWLEDGED RETRIES EXPIRED CIU ALERT POSTED HW_DEVICE COMMAND ALERT TO HW_DEVICE VALID CIU CIU COMMAND FIG. 18A

19 U.S. Patent Dec. 15,1998 Sheet 18 0f 21 5,850,436 HW_DEVICE METHOD CIU CONTROL COMMANDS EXPECTED ACKNOWLEDGE MESSAGE ANSWERPOTS PC_SEIZEL NE CIU_STATUS HANGUPPOTS PC_UNSEIZELINE CIU_STATUS ANSERHOMEWIRE PC_HWCALLACK CIU_STATUS HANGUPHOMEWIRE PC_DROPCIUCARRIER' CIU STATUS LISTEN PC_SETMONITORMODE CILLSTATUS (ON) ENDLISTEN PC SETMON'TORMODE CIU_STATUS (OFF) CIU_R NG_ROLLOVER_ READRINGCOUNT PC_GETRINGROLLOVER CURRENT SETRINGCOUNT PC_SETRINGROLLOVER C U_STATUS M FIG. 18B

20 U.S. Patent Dec. 15,1998 Sheet 19 0f 21 5,850,436 ALERT/STATUS REPORTED BY CIU C U_STATUS (PIU_CARRIER_DETECTED) ClU-STATUS (NOT PIU_CARRIER_DETECTED) C U_STATUS (OFF_HOOK DETECTED) CIU_STATUS (NOT PARALLEL OFF-HOOK DETECT) HW NDoEclFégAgggcFTRggnTsp HWR'NG HWCALLMISSED I HWRE'ILIEEEHDSEQESFCT ' POTSOFFHOOKDETECT POTSONHOOKDETECT & HWREMOTEDISCONNECT CIU_ALERT_ NFO POTSRING (ALSO ISSUE (RING AVAILABLE) PC_CLEAR_RING_TRIGGER) OIu_ALERT_INFO (STATUS CHANGED) NONE QE$UESPEC $ TTUSTATUS INFORMATION CIU_STATUS) I I FIG. 18C

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