Abstract:
An arrangement for allowing “hands-free” access to DTMF-controlled systems, such as one&#39;s voice mail messaging systems, utilizes a speech-to-DTMF tone application that monitors the communication between the user and the DTMF-controlled system. A speech recognition unit is utilized to retrieve certain voice commands (e.g., “next”, “skip”, “repeat”, “forward”, etc.) when uttered by the user. The application then translates the received commands into the proper DTMF tone sequence used by the DTMF-controlled system and transmits the DTMF tones to the system. The application is particularly useful in the cell phone environment and avoids the necessity of the user to constantly switch between using the keypad and listening to messages/commands from the system.

Description:
PRIORITY INFORMATION 
       [0001]    The present application is a continuation of U.S. patent application Ser. No. 14/021,452, filed Sep. 9, 2013, which is a continuation of U.S. patent application Ser. No. 11/051,523, filed Feb. 4, 2005, now U.S. Pat. No. 8,532,267, issued Sep. 10, 2013, which is a continuation of U.S. patent application Ser. No. 09/757,454, filed Jan. 10, 2001, now U.S. Pat. No. 6,868,142, issued Mar. 15, 2005, the contents of which are incorporated herein by reference in their entirety. 
     
    
     TECHNICAL FIELD 
       [0002]    The present invention relates to an arrangement for accessing dual-tone multifrequency (DTMF)-controlled systems such as voice messaging systems and, more particularly to a voice-operated (i.e., “hands-free”) arrangement for accessing such DTMF-controlled systems. 
       BACKGROUND OF THE INVENTION 
       [0003]    Most conventional voice mail systems utilize a DTMF-controlled telephony application to access the system and retrieve stored messages. In particular, a voice mail subscriber needs to enter his account number (and perhaps a password) to gain access to the system (where the subscriber&#39;s telephone number may be used as the account number). Various DTMF tones are then used to progress through the voice mail menu (e.g., using a “#” sign to retrieve new messages, a “1” to delete messages, a “2” to skip to the next message, etc.), where different systems may use different DTMF tones to control the message retrieval process. In general, there exist a variety of DTMF-controlled systems, such as interactive banking systems, hotel reservation systems, etc., where one maneuvers through different levels of menus by entering DTMF tones on a telephone keypad. 
         [0004]    Many individuals now use relatively small cell phones that include the DTMF keypad on the same structure as the transmitter (microphone) and receiver (speaker). When using such a cell phone to access a DTMF-controlled system, the phone must constantly be moved between an individual&#39;s line-of-sight (to enter the proper DTMF tones) and his ear (to listen to messages or commands from the voice mail system). In another common scenario, many individuals now retrieve voice mail messages while traveling in their cars. While many car phones today have a “hands-free” option for dialing outbound calls (see, for example, U.S. Pat. No. 5,805,672), once the call has been established, the person traveling in the car still needs to use the keypad on the car phone to further access different telecommunications-based services and systems. 
         [0005]    Thus, a need remains in the art for an arrangement capable of providing “hands-free” access to and progress through any DTMF-controlled telecommunications system, particularly when accessing such a system with a device such as a cell phone. 
       SUMMARY OF THE INVENTION 
       [0006]    The need remaining in the prior art is addressed by the present invention, which relates to an arrangement for accessing a DTMF-controlled system (such as, for example, a voice messaging system) and, more particularly to a voice-operated (i.e., “hands-free”) arrangement for accessing such a system. 
         [0007]    In accordance with the present invention, a speech-to-DTMF tone application is provided for and accessed by a user wishing to interact with a DTMF-controlled system in a “hands-free” manner. The speech-to-DTMF tone application is responsive to a user&#39;s initial voice prompt (via a speech recognition unit) to allow access to the application and locate the proper user&#39;s record in the application database. The speech-to-DTMF tone application looks up the user&#39;s access number, dials out to the associated system and then connects the user to the proper DTMF-controlled system. The application stays on the line and “listens” for predetermined voice commands from the user (i.e., “next”, “delete”, “repeat”, etc.). When such a voice command occurs, the application performs a translation from the command to the DTMF tones used by that system, and forwards the proper tones to the system. 
         [0008]    While “listening” for one of the predetermined voice commands, the speech-to-DTMF application allows all of the audio signals to also pass through from the user to the DTMF-controlled system. The passage of the audio signals allows the user to speak to the system (such as when recording a message), as well as to directly use the system with the DTMF commands. Thus, the user may mix voice commands and DTMF commands without constraint. 
         [0009]    In a preferred embodiment of the present invention when a user has more than one DTMF-controlled system (such as in the case of multiple voice message accounts), the speech-to-DTMF tone application is capable of processing through each system and transmitting the individual tones recognized by each system. 
         [0010]    The speech-to-DTMF tone application of the present invention may be formed as either a network-based application or, alternatively, may be embedded within an individual&#39;s cell phone. 
         [0011]    Other and further aspects of the present invention will become apparent during the course of the following discussion and by reference to the accompanying drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]    Referring now to the drawings, 
           [0013]      FIG. 1  illustrates an exemplary network arrangement for deploying the voice-activated DTMF-controlled system of the present invention; 
           [0014]      FIG. 2  is a simplified diagram illustrating portions of the speech-to-DTMF tone application of the present invention; and 
           [0015]      FIG. 3  contains a flowchart of an exemplary process for a user to interact with one or more voice mail accounts through the speech-to-DTMF tone application of the present invention. 
       
    
    
     DETAILED DESCRIPTION 
       [0016]    A simplified network architecture  10  capable of supporting the voice-operated interface of the present invention is illustrated in  FIG. 1 . For the sake of simplicity, a single user  12  is shown, although any communication is known to support thousands of such users. In accordance with the present invention, user  12  may be defined as an individual utilizing a cell phone, a car phone, or any other communication device that may include the keypad on the same unit as the transmitter (microphone) and receiver. However, the speech-to-DTMF tone application may also be used with any type of telephone device and, as such, may be useful to those with limited abilities to use a keypad for a variety of reasons (eyesight problems, hand control problems, etc.). It is to be understood that as an alternative to the network-based arrangement of  FIG. 1 , the speech-to-DTMF tone application of the present invention may be implemented as a stand-alone application within the user&#39;s telecommunication device (e.g., cell phone). 
         [0017]    Referring back to  FIG. 1 , user  12  employs the speech-to-DTMF tone application of the present invention by first dialing a predefined telephone number to access a speech server  14  supporting a speech-to-DTMF tone application  16 . This communication is generally established, in the architecture as shown in  FIG. 1 , through a set of communication switches  18  forming a communication network  20  (in one example, network  20  may comprise the public switched telephone network, commonly referred to as the PSTN). Once communication is established with speech server  14 , user  12  will be prompted to enter voice commands to identify himself (and, perhaps, further password information) and allow speech-to-DTMF tone application  16  to locate the proper user record  22 , where an exemplary user record  22  will be described in detail below in association with the discussion of  FIG. 2 . Upon locating the proper user record  22 , application  16  will launch a telephone call to the associated DTMF-controlled system  24 , then bridge together the incoming call from user  12  with this call to DTMF-controlled system  24 . One example of such a DTMF-controlled system is a voice messaging system (which uses various DTMF tones—or combination of tones—to control message playback and responses, such as “forward”, “next”, “skip”, etc.). Various other DTMF-control led systems include bank access systems, reservation systems, etc. In general, the speech-to-DTMF application of the present invention is equally applicable to all such systems. Throughout this discussion, the operation of the present invention will often be discussed in terms of a “voice mail messaging system”. It is to be presumed, however, that the inventive technique is equally applicable to all such systems. 
         [0018]    Application  16  will stay on the call, listening for predetermined voice prompts from user  12  as the call progresses through the DTMF-controlled system, such as a message retrieval process. For example, the voice prompts may include commands such as “next”, “skip”, “back”, “first”, “delete”, etc. Indeed, virtually each command used by a DTMF-controlled system may be implemented as a voice prompt from user  12 . Application  16  is then used to translate the recognized prompts into the proper DTMF tone (or tones) utilized by the system  24  currently being accessed. These tones are then played out to the voice messaging system by the speech server&#39;s player  27 . Speech player  27  may also play verification prompts back to user  12 . For example, when application  16  determines that the user spoke the word “delete”, application  16  can direct player  27  to prompt user  12  back with a confirmation response of “deleted”. 
         [0019]    User  12  may interact directly with the DTMF-controlled system at any time during the interaction through speech-to-DTMF tone application  16 . Referring to  FIG. 1 , if user  12  presses a key on his/her phone to send a DTMF tone (or tones) to the system, that tone(s) will be carrier through the network to speech server  14 , then carried through the call bridge in server  14  back to the network, and finally to DTMF-controlled system  24 . In this way, the user can move arbitrarily back and forth between the DTMF tone controls that he/she normally uses and the voice commands that application  16  makes available. Similarly, user  12  is not prevented from speaking to the DTMF-controlled system. For example, if the user needs to record a message, or place a call using a “return call” option on an exemplary DTMF-controlled messaging system, he can speak and his voice will be carried through the bridge on server  14  to the DTMF-controlled messaging system. 
         [0020]    As will be discussed in detail below, an aspect of the present invention in the capability of application  16  to access more than one DTMF-controlled system associated with a single user  12 . For example, a second messaging system  28  is illustrated in  FIG. 1  and may be accessed by spoken command, e.g., “get my messages from work”, where it is to be noted that user  12  has previously designated a particular mailbox as “work”, such as system  28 . 
         [0021]      FIG. 2  illustrates in more detail some of the components utilized within speech server  16  to provide the speech-to-DTMF tone application  16  of the present invention. In this case, a single user record  22  is illustrated, as is its interconnection to speech recognition unit  26 . As mentioned above, all incoming voice signals from user  12  pass through speech recognition unit  26 , which uses well-known techniques to translate the received voice signals into digital signal messages that are then used by the rest of the application to perform the desired functions. In this case, user  12  first provides an “identification” message prompt which passes through recognition unit  26  and is used to locate the proper user record  22  in application  16 . Additional password information may be required, for security reasons, but is not necessary to implement the system of the present invention. A “user ID” field  30  and password field  32  are both shown in the exemplary record  22  of  FIG. 2 . Record  22  includes, for each DTMF-controlled system associated with user  12 , various fields of information required to access the particular system and provide the desired DTMF tones. An exploded view of one such set of fields is illustrated in  FIG. 2 , in this case associated with voice messaging system “A” of user  12  (which may be, for example, message system  24  as shown in  FIG. 1 ). 
         [0022]    In accordance with the present invention, application  16  retrieves the dial-out telephone number associated with messaging system “A”, as stored in field  36  of record  22 , and initiates a telephone call to that messaging system. If further tones are required to access user  12 &#39;s account in system “A”, those tones may be stored in field  38  of record  22  and used by application  16  to access the proper voice mail account of user  12 . Once a call to messaging system “A” has been established, application  16  will bridge the incoming call from user  12  with this call so that user  12  can begin to retrieve the stored messages. Application  16 , in accordance with the present invention, will “stay on the line” during the message retrieval process, “listening” for predetermined voice prompts from user  12  and then translating these commands into DTMF tones that are then sent to the messaging system to control certain actions within the system. In particular, speech recognition unit  26  is configured to recognize those commands that are listed for the specific DTMF-controlled system that is being called, in the record of the current user. In  FIG. 2 , field  40  is an example of such a command in the list. Field  40  might contain the word “delete”, the next field might have “play”, the next “reply”, etc. These words would form the “vocabulary” of the speech recognition unit for the duration of the call from the specific user to the specific DTMF-controlled system. If the user selected a different system, or if a new user calls in, then the vocabulary for the speech recognition would be re-loaded, based on the command list contained in the record. 
         [0023]    The DTMF tones to be transmitted with each command are also listed for each DTMF-controlled system in each user&#39;s record. For example, if speech recognition unit  26  receives the prompt “delete” from user  12 , unit  26  will recognize the spoken word “delete” and forward it to application  16 . Application  16  will perform a look-up in record  22 , locating “deleted” in field  40  (in this particular example) and retrieve the DTMF tones from field  42  (e.g., “*1”) that are associated with deleting a message. In accordance with the present invention, application  16  will then transmit these tones to messaging system “A”, and the identified message will be deleted. Various other prompts (i.e., “skip”, “next”, “first”, “end”, etc.) may all be stored as separate fields in record  22  and will be translated in a similar fashion as discussed above. As will be discussed below, user  12  can at any time decide to retrieve messages from other messaging systems (such as messaging system “B” identified in  FIG. 2 ). 
         [0024]      FIG. 3  contains a flowchart illustrating an exemplary process that may be employed in implementing the speech-to-DTMF tones application of the present invention in the voice messaging environment. As shown, the process begins (block  50 ) with a user dialing into the speech-to-DTMF tone application, where the dial-in number may be provided to a user who has subscribed to such “special services” in association with his telecommunication services. Once the application has been accessed, it will send back a prompt to the user (block  52 ) requesting identification information, such as in the form of a “user ID” and password. The response information from the user is then checked to determine if the individual is indeed an “authorized” user who has subscribed to this particular service (block  54 ). If no such user is found, the program will exit (block  56 ). Otherwise, the application will use the user-supplied information to retrieve the proper user record from the database (block  58 ), where as discussed above, the user record contains all of the information required for the speech-to-DTMF tone application to interact with the user&#39;s voice messaging systems, including a designation of a “default” messaging system to retrieve messages from if a particular messaging system is not designated. 
         [0025]    As shown in  FIG. 3 , the application will dial out to the user&#39;s selected voice messaging system (block  60 ), using the dial-out number stored in the user&#39;s record and will bridge together the incoming call from the user with that call. Instead of hanging up, however, the application will “listen” to the user&#39;s speech commands (differentiating the user&#39;s speech from the voices played back in the received messages) (block  64 ). If the command is to navigate within the messaging system (i.e., “next”, “delete”, “previous”, etc.), the speech recognition unit in the application will then translate the received command into associated DTMF tones (block  66 ) and the application will forward these tones to the messaging system. As discussed above, the various voice prompts that the application is listening for include all of the conventional commands associated with a voice mail system (such as, “next”, “delete”, “skip”, etc.), as the user desires to connect to another messaging system or hang up. If the user&#39;s command is to connect to another DTMF-controlled system (block  70 ), then the connection to the current system is broken and a call to the new DTMF-controlled system is made and bridged with the user&#39;s incoming call (blocks  62 ,  60 ). If the command is to exit from the system (block  72 ), the calls are simply hung up (block  56 ). If the command is not understood by the system, the application will return an error message to the user (block  74 ). 
         [0026]    Alternatively, the application may be configured to “ignore” any input that is not understood. This allows the user to speak to the messaging system without interference from the application. For example, the user may want to forward a message with a comment. The DTMF-controlled messaging system would then need to record the message from the user. The user could leave a message, and as long as the message did not include an isolated utterance of a command that the application is listening for at that time, it would not interfere with the message recording. 
         [0027]    In an alternative embodiment of the present invention, a “local” speech-to-DTMF tone application may be included in the user&#39;s cell phone, instead of utilizing the network-based arrangement shown in  FIG. 1 . In such a case, the user ID and password information would not be necessary. However, such an embodiment would entail the inclusion of a speech recognition unit and memory unit storing the various information described above. In either case, the system is capable of providing “hands-free” access to DTMF-controlled systems and, in general, the subject matter of the present invention is intended to be limited in spirit only by the scope of the claims appended hereto.