USH1646H - Speech recognition adapter for telephone system - Google Patents

Speech recognition adapter for telephone system Download PDF

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Publication number
USH1646H
USH1646H US08/059,035 US5903593A USH1646H US H1646 H USH1646 H US H1646H US 5903593 A US5903593 A US 5903593A US H1646 H USH1646 H US H1646H
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United States
Prior art keywords
voice sound
telephone
speech recognition
telephone set
memory
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US08/059,035
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English (en)
Inventor
Yasuhiko Kato
Masao Watari
Miyuki Tanaka
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Sony Corp
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Individual
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Filing date
Publication date
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Assigned to SONY CORPORATION reassignment SONY CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KATO, YASUHIKO, TANAKA, MIYUKI, WATARI, MASAO
Application granted granted Critical
Publication of USH1646H publication Critical patent/USH1646H/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
    • H04M1/65—Recording arrangements for recording a message from the calling party
    • H04M1/652—Means for playing back the recorded messages by remote control over a telephone line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/27—Devices whereby a plurality of signals may be stored simultaneously
    • H04M1/271—Devices whereby a plurality of signals may be stored simultaneously controlled by voice recognition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/27—Devices whereby a plurality of signals may be stored simultaneously
    • H04M1/274—Devices whereby a plurality of signals may be stored simultaneously with provision for storing more than one subscriber number at a time, e.g. using toothed disc
    • H04M1/2745—Devices whereby a plurality of signals may be stored simultaneously with provision for storing more than one subscriber number at a time, e.g. using toothed disc using static electronic memories, e.g. chips
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2201/00—Electronic components, circuits, software, systems or apparatus used in telephone systems
    • H04M2201/40—Electronic components, circuits, software, systems or apparatus used in telephone systems using speech recognition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/74—Details of telephonic subscriber devices with voice recognition means

Definitions

  • the present invention relates to a speech recognition adapter for use with one such as a telephone set with a telephone answering function or capabilities.
  • Conventional telephone sets with a telephone answering function generally record messages from incoming calls that arrive while a called party is out or otherwise unavailable to answer the telephone, on magnetic tape or on some type of electronic memory device.
  • a called party can call his or her own telephone set from a remote telephone set, such as a telephone set outside his or her home, and press pushbuttons of the keypad of the remote telephone set to transmit a signal representing a pre-registered password as well as a predetermined signal to reproduce and listen to any recorded incoming call messages that may have been recorded on the tape or memory.
  • a telephone set having a telephone answering function can be remotely controlled via commands dialed or keyed in through a remote telephone keypad, or dial, to perform various functions, e.g., reproduce and erase recorded messages.
  • pushbuttons thereof are generally depressed to dial a desired telephone number of a person to whom the telephone call is to be made. Since different telephone numbers are used to call different persons, those different telephone numbers generally also have to be memorized by a user.
  • a voice activated telephone set having a memory, for example, which stores the names of persons and their telephone numbers.
  • the telephone set transmits a pulse or dial tone signal corresponding to the stored telephone number that is associated with the uttered name.
  • Wide spread use of this type of telephone set is currently impractical due to the relatively high cost.
  • a speech recognition adapter for use in a telephone system having a telephone set and an exchange office or central switching office, adapted to be connected between a modular jack coupled to the telephone set and a modular jack coupled to the exchange office, the speech recognition adapter incorporates a speech recognizing unit for recognizing a voice sound, or voice sound pattern, a storage control unit for storing a voice sound recognized by the speech recognizing unit in association with particular command information such as, for example, telephone numbers, names or telephone set operational functions and a transmitting unit for transmitting or dialing a telephone number or issuing a signal representing telephone set operational functions in response to a recognized voice sound pattern.
  • the speech recognizing unit recognizes or detects a voice sound representing the name of a person to be called via the telephone set. If the detected voice sound corresponds to a name stored in the storage control unit, the transmitting unit transmits or dials the telephone number associated with the name stored in memory to which the detected voice sound corresponds.
  • the speech recognizing unit may alternatively recognize a voice sound transmitted from the exchange office representing or corresponding to a function of the auxiliary answer machine of the telephone set.
  • the speech recognizing adapter may be responsive to the voice sound transmitted from the exchange office and recognized by the speech recognizing unit for transmitting a message or performing an operation associated with a command stored in the storage control means which corresponds to a detected voice sound.
  • the speech recognition adapter is connected between the modular jack coupled to the telephone set and the modular jack coupled to the exchange office.
  • the speech recognition adapter recognizes a voice sound corresponding to or the name of a person to be called or a function of the telephone set.
  • the voice sound is stored in memory in association with a telephone number transmitted from the telephone set.
  • the speech recognition adapter transmits or dials a telephone number.
  • the speech recognition adapter can dial a telephone number or operate the telephone set under the control of a voice sound. The speech recognition adapter can thus operate the telephone set with ease at low cost.
  • the speech recognizing unit recognizes a voice sound transmitted from the telephone set, which represents the name of a person to be called, and the transmitting unit transmits or dials a telephone number representing the name of a person to be called which is stored in the storage control means to the exchange office in response to the voice sound from the telephone set and recognized by the speech recognizing unit.
  • the telephone set can be operated with ease because the user can make a telephone call simply by pronouncing or uttering the name of the person to be called.
  • the speech recognizing unit recognizes a voice sound from the exchange office, which represents a function of the telephone set.
  • the transmitting means transmits a telephone number stored in the storage control unit to the telephone set in response to the voice sound representing the function of the telephone set from the exchange office and recognized by the speech recognizing means.
  • the user is not required to memorize how to operate the telephone set, and the telephone set can be operated with ease because the user can control the telephone set simply by pronouncing or uttering the desired function of the telephone set.
  • FIG. 1 is a block diagram of a speech recognition adapter according to the present invention which is directly connected to modular jacks on telephone set and exchange office sides;
  • FIG. 2 is a flowchart of an operation sequence of the speech recognition adapter shown in FIG. 1 when it operates in a name registration mode;
  • FIG. 3 is a flowchart of an operation sequence of the speech recognition adapter shown in FIG. 1 when it operates in a command registration mode;
  • FIG. 4 is an illustration showing the relation of FIG. 4A and 4B to each other;
  • FIG. 4A and FIG. 4B are a flowchart of an operation sequence of the speech recognition adapter shown in FIG. 1 when it operates in a speech registration mode;
  • FIG. 5 is a block diagram of the speech recognition adapter that is connected to modular jacks on telephone set and exchange office sides through a three-way modular jack.
  • a speech recognition adapter As shown in FIG. 1, a speech recognition adapter, generally designated by the reference numeral 1, according to the present invention is connected between a telephone set 10 and an exchange office.
  • the telephone set 10 has a telephone answering function, and is of a known nature capable of performing various functions, e.g., reproducing and erasing messages that have been recorded on a built-in tape or electronic memory device (not shown) while the user is away, under the control of dial numbers transmitted from a remote telephone set (not shown).
  • the speech recognition adapter 1 incorporates a tone signal generator 2, a noise filter 3, a speech recognition unit 4, a line sensor 5, a controller 6, a registration switch 7, and a name/command selector switch 8.
  • the speech recognition adapter 1 is connected to a modular jack 11 which is coupled to the telephone set 10 and a modular jack 12 which is coupled to the exchange office.
  • the tone signal generator 2 is controlled by the controller 6 to transmit a pushbutton or touchtone signal or a dial pulse signal corresponding to a dialed number to the telephone set 10 or the exchange office.
  • the noise filter 3 serves to remove noise that may be present on the telephone transmission line and also a dial tone transmitted from the exchange office (switchboard, not shown) when the handset (not shown) of the telephone set 10 is off-hook.
  • the speech recognition unit 4 recognizes or detects, through the noise filter 3, a speech or voice signal transmitted from the telephone set 10 or the exchange office, and supplies a recognized result output signal to the controller 6.
  • the line sensor 5 monitors the condition of the telephone transmission line for a change in the line voltage, for example, it detects whether the handset of the telephone set 10 is off-hook to make a telephone call from the telephone set 10 or to answer a telephone call from the exchange office, and outputs a recognized result output signal to the controller 6.
  • the line sensor 5 also detects which keys have been activated or dialed from the telephone set 10 or the exchange office, to the telephone transmission line. The information or commands represented by the activated keys is output from line sensor 5 to controller 6.
  • the controller 6 When registration switch 7 is turned on, i.e., when the speech recognition adapter 1 is in a registration mode, the controller 6 associates an uttered voice sound, which has been outputted from the telephone set 10 and recognized by the speech recognition unit 4, indicative of the name of a person to be called or desired function of the telephone set 10, with a dial number entered into memory by keys of actuating the keypad or dial (not shown) of telephone set 10.
  • the dialed number or command is stored in memory in association with the appropriate voice or verbal sound pattern information (not shown).
  • the controller 6 When the registration switch 7 is turned off, i.e., when the speech recognition adapter 1 is in a speech recognition mode, the controller 6 reads, from the built-in memory, a dial number associated with a pronounced uttered voice sound indicative of the name of a person to be called or a function of the telephone set 10. A voice sound is outputted from the telephone set 10 or the exchange office and recognized or detected by the speech recognition unit 4. A control signal is sent to tone signal generator 2 to transmit the dial number to the telephone set 10 or the exchange office.
  • the registration switch 7 serves to switch the operation mode of the speech recognition adapter 1 between a registration mode and a speech recognition mode.
  • the name/command selector switch 8 is effective or active when the registration switch 7 is turned on.
  • the name/command selector switch 8 is shifted to select a name mode when a dial number to be stored in the built-in memory of the controller 6 is a telephone number associated with the name of a person to be called.
  • the name/command selector switch 8 is shifted to select a command mode when a dial number to be stored in the built-in memory of the controller 6 is a command associated with a function of the telephone set 10.
  • the registration switch 7 is turned on and the name/command selector switch 8 is shifted to select the name mode, i.e., the speech recognition adapter 1 is in a name registration mode.
  • the line sensor 5 detects the off-hook of the handset, and indicates the off-hook condition to the controller 6.
  • the controller 6 then applies a control signal to the speech recognition unit 4 to register the voice sound (indicating the name of the person) that is supplied from the telephone set 10 (handset of the telephone set 10) through the modular jack 11 and the noise filter 3.
  • the speech recognition unit 4 Upon detection of the control signal from the controller 6, the speech recognition unit 4 registers the voice sound (indicating the name of the person) that is supplied from the telephone set 10 (handset of the telephone set 10) through the modular jack 11 and the noise filter 3, as a standard pattern in a built-in standard pattern memory.
  • the speech recognition unit 4 uses one of the two uttered names of a person, which has been uttered twice while the handset of the telephone unit 10 is lifted off-hook, for registration, and the other utterance for confirmation. Specifically, only when the voice sound patterns of the two utterances of the name agree with each other, will the speech recognition unit 4 store either one of the utterances of the name in the built-in standard pattern memory.
  • the telephone number entered is supplied through the line sensor 5 to the controller 6.
  • the telephone number is associated with the registered name stored in the built-in standard pattern memory of the speech recognition unit 4, and stored in the built-in memory of the controller 6.
  • the registration switch 7 is turned on and the name/command selector switch 8 is shifted to select the command mode, i.e., the speech recognition adapter 1 is in a command (function of the telephone set 10) registration mode.
  • a password number is first registered. Specifically, the handset of the telephone set 10 is lifted off-hook and a multi-digit dial number, for example, a four-digit dial number, is input as a password number via pushbuttons of the keypad of the telephone set 10, and then the handset of the telephone set 10 is placed on-hook.
  • the password number is supplied through the line sensor 5 to the controller 6, and stored in the built-in memory of the controller 6.
  • a voice sound representing a command for executing a function of the telephone set 10 for example, a voice sound of "PLAYBACK" representing a command to play back messages that have been recorded on the tape, is uttered twice by a party.
  • the line sensor 5 detects the on-hook of the handset, and indicates the on-hook condition to the controller 6.
  • the controller 6 then applies a control signal to the speech recognition unit 4 to register the voice sound (indicating the command "PLAYBACK") that is supplied from the telephone set 10 (handset of the telephone set 10) through the modular jack 11 and the noise filter 3.
  • the speech recognition unit 4 Upon detection of the control signal from the controller 6, the speech recognition unit 4 registers the voice sound (indicating the command "PLAYBACK") that is supplied from the telephone set 10 (handset of the telephone set 10) through the modular jack 11 and the noise filter 3, as a standard pattern in a built-in standard pattern memory.
  • the speech recognition unit 4 uses one of the two utterances of the name of the person, which has been uttered while the handset of the telephone unit 10 is lifted off-hook, for registration, and the other utterance is used for confirmation.
  • dial number for performing the function of the telephone set 10 which corresponds to the previously uttered command "PLAYBACK", i.e., a dial number (e.g., "#1") for playing back messages that have been recorded on the tape, and the handset of the telephone set 10 is placed on-hook
  • the dial number is supplied through the line sensor 5 to the controller 6.
  • the dial number is associated with the registered voice sound (command "PLAYBACK") stored in the standard pattern memory of the speech recognition unit 4, and stored in the built-in memory of the controller 6.
  • the registration switch 7 is turned off, i.e., the speech recognition adapter 1 is in a speech recognition mode.
  • the line sensor 5 detects the off-hook of the handset of the telephone set 10, and indicates the off-hook condition to the controller 6.
  • the controller 6 applies a control signal to the speech recognition unit 4 to recognize a voice sound (representing the name of a person to be called) output or transmitted from the telephone set 10.
  • the speech recognition unit 4 starts sampling or recognizing the voice sound which represents the name of a person to be called.
  • the line sensor 5 detects the dial numbers forwards information represented by the detected dial numbers to the controller 6.
  • the controller 6 outputs a control signal to the speech recognition unit 4 to cause the speech recognition unit 4 to stop the speech recognition process.
  • the speech recognition adapter 1 establishes a through connection allowing a signal from the modular jack 11 to be outputted to the modular jack 12 and also allowing a signal from the modular jack 12 to be outputted to the modular jack 11.
  • the uttered voice sound (representing the name of the person) is supplied from the telephone set 10 through the modular jack 11 and the noise filter 3 to the speech recognition unit 4.
  • the speech recognition unit 4 refers to the standard patterns stored in the built-in standard pattern memory. If the uttered voice sound corresponds to a voice sound pattern stored in the standard pattern memory, a signal is sent to the controller 6. The controller 6 then reads dial numbers (representing the telephone number) which are associated with the name of the person from the speech recognition unit 4 from the built-in memory, and supplies the dial numbers to the tone signal generator 2.
  • the tone signal generator 2 supplies a touch-tone or dial pulse signal corresponding to the dial numbers (representing the telephone number) supplied from the controller 6, through the modular jack 12 to the exchange office to dial the telephone number associated with the name of the person whose name was pronounced or uttered.
  • the user can make a telephone call to a person simply by uttering the name of the person.
  • a message of the telephone answering mode for example, "I AM OUT NOW. PLEASE LEAVE A MESSAGE.”, is transmitted from the telephone set 10. If any dial numbers indicating a password number are not immediately thereafter transmitted from the calling party's telephone set, the speech recognition adapter 1 sets up a through connection, and the telephone set 10 operates in the telephone answering mode.
  • the line sensor 5 detects the password number and supplies it to the controller 6.
  • the controller 6 determines whether or not the password number from the line sensor 5 agrees or is identical to a password number that has been registered in a memory. If the password number detected by the line sensor 5 agrees with a password number that has been registered in memory, then the controller 6 outputs a control signal to the speech recognition unit 4 to recognize a voice sound (representing a command) transmitted from a calling party's telephone set. Upon detection of the control signal from the controller 6, the speech recognition unit 4 is activated to receive the voice sound representing the command.
  • dial numbers indicative of a command are detected by the line sensor 5, which outputs a signal indicating the reception of a command from a calling party's telephone set, to the controller 6.
  • the controller 6 outputs a control signal to the speech recognition unit 4 to cause the speech recognition unit 4 to stop the speech recognition process.
  • the speech recognition adapter 1 establishes a through connection between telephone set 10 and the telephone exchange (i.e. calling party).
  • the voice sound indicating the command "PLAYBACK” is supplied from the calling party's telephone set through the modular jack 12 and the noise filter 3 to the speech recognition unit 4.
  • the speech recognition unit 4 scans the standard patterns stored in the standard pattern memory. If the voice sound command corresponds to a standard pattern stored in memory, the command associated with the standard pattern is output by speech recognition unit 4 to controller 6 (i.e. "PLAYBACK").
  • the controller 6 then reads a dial number, for example, "#1", which is associated with the command "PLAYBACK” from memory, and supplies the dial number to tone signal generator 2.
  • Tone signal generator 2 supplies a touchtone or a dial pulse signal corresponding to the dial number "#1" through the modular jack 11 to the telephone set 10.
  • the telephone set 10 now performs the function corresponding to or associated with the dial number "#1", for example, playback of messages that have been recorded on the tape or electronic or optical memory.
  • a user can control functions of the telephone set 10 (i.e., operate the telephone set 10) simply by uttering or verbally pronouncing a command from a remote telephone set.
  • the registration switch 7 is turned on in step S1, the name/command selector switch 8 is shifted to select name in step S2.
  • the speech recognition adapter 1 enters the name registration mode (for registering the name of a person to be called) in the steps S1, S2.
  • step S3 the handset of the telephone set 10 is lifted off-hook, and the name of a person to be called is uttered or verbally pronounced twice by the user.
  • Voice pattern information representing the verbalized name is stored in the standard pattern memory of the speech recognition unit 4.
  • step S4 the telephone number of the person whose name has been uttered or verbally pronounced in step S3 is input, associated with the name of the person, and stored in the memory of the controller 6. The name registration mode is now completed.
  • step S3 If there is a plurality of persons whose names have to be registered, the above steps S3 and S4 are repeated. With each name registration, one of the two utterances of the name of the person which has been uttered twice in step S3, is used for registration while the other utterance is used for confirmation.
  • the registration switch 7 is turned on in step S11, then a password number is input in step S12, and the name/command selector switch 8 is shifted to select command in step S13.
  • the speech recognition adapter 1 enters the command registration mode (for registering a function of the telephone set 10) in the steps S11,S12, S13.
  • step S14 the handset of the telephone set 10 is lifted off-hook, and a verbal command is uttered twice by a user and stored in standard pattern memory of the speech recognition unit 4.
  • step S15 a dial number corresponding to the command which has been uttered in step S14 is input, associated with the command, and stored in memory of the controller 6. The command registration mode is now complete.
  • step S3 If there is a plurality of persons whose names have to be registered, the above steps S3 and S4 are repeated. With each name registration, one of the two utterances of the name of the person which has been uttered twice in step S3, is used for registration, and the other utterance is used for confirmation.
  • FIG. 4A and FIG. 4B show the speech recognition mode of the speech recognition adapter 1.
  • step S21 determines whether the handset of the telephone set 10 is lifted off-hook or not. If the handset of the telephone set 10 is lifted off-hook, then the process proceeds to step S22 to start a speech recognition process for recognizing the name of a person to be called.
  • step S23 determines whether pushbuttons of the keypad of telephone set 10 are pressed or activated to input dial numbers (representing a telephone number). If dial numbers (representing a telephone number) are input, the speech recognition process is brought to an end because a signal is transmitted using the pushbuttons of the telephone set 10.
  • step S23 determines whether a recognized voice signal is input or received. If no recognized voice signal is received during the speech recognition process started in the step S22, then control goes back to step S23. The steps S23, S24 are repeated until a recognized voice signal is produced or received during the speech recognition process started in the step S22.
  • step S22 If a recognized voice signal is produced or received during the speech recognition process started in the step S22, i.e., if a recognized name of a person to be called is uttered in step S24 after the handset is lifted off-hook in step S21, control goes to step S25 in which dial numbers (representing telephone number) associated with the recognized name of step S24 are transmitted from the telephone set 10. Thereafter, the speech recognition process is complete.
  • step S21 determines whether a telephone call from another telephone set is received by the telephone set 10. If not, then control returns to step S21. Steps S21, S26 are repeated until a telephone call from a remote telephone set is received by telephone set 10.
  • step S26 If a telephone call from a remote telephone set is received by the telephone set 10 in the step S26, control proceeds to step S27 which starts the telephone answering mode of telephone set 10.
  • step S28 it is determined whether the telephone call received from a remote telephone, or calling party, is cut off or not. If cut off, the speech recognition mode comes to an end. If not, control goes to step S29 .which determines whether a password number is transmitted, or dialed, from the remote telephone set. If a password number is not transmitted or dialed, in step S29, control returns to step S28. Steps S28, S29 are repeated until a password number is transmitted or dialed, from the other telephone set.
  • step S30 If a password number is transmitted from the other telephone set in step S29, then control proceeds to step S30 which starts a speech recognition process for recognizing a command. Then, control goes to step S31 to determine whether pushbuttons of the remote telephone set from which the telephone call has been initiated, are pressed or actuated to transmit or dial a dial number. If a dial number is transmitted from the remote telephone set in step S31, the speech recognition mode is ended since a command has been transmitted via the pushbuttons of the keypad of the remote telephone set.
  • step S31 determines whether the telephone call from the remote telephone set is cut off or not. If cut off, the speech recognition mode comes to an end. If not cut off, control goes to step S33 which determines whether a recognized voice signal is received in step S30. If no recognized voice signal is received during the speech recognition process started in step S30, control goes back to step S31. Steps S31, S32, S33 are repeated until a recognized voice signal is received during the speech recognition process started in step S30.
  • step S30 If a recognized voice signal is received during the speech recognition process started in step S30, control goes to step S34 in which a dial number, associated with the command whose voice sound or signal has been received in step S33, is transmitted to telephone set 10. Thereafter, the speech recognition process is complete.
  • step S21 After the speech recognition process is complete, it is started again from step S21 by a timer-initiated interrupt signal.
  • the telephone set 10 can be controlled (operated) by voice sounds or signals, simply by connecting the speech recognition adapter 1 between the modular jack 11 coupled to the telephone set 10 and the modular jack 12 coupled to the exchange office.
  • the telephone set 10 can be operated with ease and at low cost.
  • the speech recognition adapter 1 is connected in series between the modular jack 11 coupled to the telephone set 10 and the modular jack 12 coupled to the exchange office.
  • the modular jack 11 coupled to the telephone set 10, the modular jack 12 coupled to the exchange office, and the speech recognition adapter 1 may be connected by a three-way modular jack 21.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • Telephone Function (AREA)
US08/059,035 1992-05-08 1993-05-07 Speech recognition adapter for telephone system Abandoned USH1646H (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP14342992A JP3144595B2 (ja) 1992-05-08 1992-05-08 音声アダプタ
JP4-143429 1992-05-08

Publications (1)

Publication Number Publication Date
USH1646H true USH1646H (en) 1997-05-06

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US08/059,035 Abandoned USH1646H (en) 1992-05-08 1993-05-07 Speech recognition adapter for telephone system

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Country Link
US (1) USH1646H (ja)
EP (1) EP0568979A1 (ja)
JP (1) JP3144595B2 (ja)
KR (1) KR930024375A (ja)

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CN102917143B (zh) * 2012-10-09 2016-01-27 广东欧珀移动通信有限公司 一种特殊号码的通话方法及装置
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JPH05316189A (ja) 1993-11-26
EP0568979A1 (en) 1993-11-10
KR930024375A (ko) 1993-12-22

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