Abstract:
A system and method of creating a digit string for use by a phone includes the steps of collecting speech data having numerical digits and/or alphabetical characters, parsing the speech data, converting each alphabetical character of the speech data into a numerical digit associated therewith, and assembling the speech data chronologically to form a digit string consisting of numerical digits and/or converted alphabetical characters. The converting step further includes comparing each alphabetical character of the speech data to a mapping table stored in memory and determining a numerical digit corresponding to each alphabetical character of the speech data from the mapping table.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates generally to the use of digit strings by a portable phone and, more particularly, to a system and method for creating a digit string for use by a portable phone from speech data including alphabetical characters. 
     2. Description of Related Art 
     It has become well known in the communications art to rely upon voice or speech signals to impart data and/or instructions to a terminal handset or portable phone. This is particularly useful in a vehicle or other similar environment when manual implementation of the communications device is limited or not practical. In such case, a person is able to merely speak the numerical digits desired and then verbally give a command (e.g., “dial”) as to how the digit string is to be utilized. Accordingly, the user of the phone need not direct his attention exclusively to the phone by looking at and pushing the desired keys. 
     While the aforementioned manner of voice dialing is helpful in most circumstances, it clearly is limited when alphabetical characters are involved. For example, many commercial entities attempt to procure a phone number which, when applied to the standard phone keypad, spell out the company name or provide some alphabetical or phonic association therewith. The dial string for placing a call may thus become better known by alphanumeric representation instead of the numerical digits alone. Moreover, advertising of the phone number in this manner (e.g., as with 800 numbers) further promotes memorization for future use. 
     Since current methods of voice dialing do not permit the input of alphabetical characters, it will be understood that no advantage is present over just looking at and pushing the keys of the phone for numbers consisting of alphanumeric characters. This can obviously be hazardous when a user is driving a vehicle and he desires to dial a number which includes alphabetical characters. Not only must he look at the keypad to manually enter the number, but each alphabetical character also requires mental decoding before doing so. 
     Accordingly, it is a primary object of the present invention to provide a system and method for creating a digit string for use by a phone from speech data including numerical digits and/or alphabetical characters. 
     It is another object of the present invention to provide a system and method for converting speech data including alphabetical characters into numerical digits for inclusion in a digit string. 
     It is still another object of the present invention to provide a telephone and method for safely dialing such telephone from speech data containing alphabetical characters while in a vehicle or other similar environment. 
     Yet another object of the present invention is to provide a system and method for storing speech data including numerical digits and/or alphabetical characters as a digit string in a speed dial location of a phone 
     These objects and other features of the present invention will become more readily apparent upon reference to the following description when taken in conjunction with the following drawings. 
     SUMMARY OF THE INVENTION 
     In accordance with a first aspect of the present invention, a method of creating a digit string for use by a phone is disclosed as including the steps of collecting speech data having numerical digits and/or alphabetical characters, parsing the speech data, converting each alphabetical character of the speech data into a numerical digit associated therewith, and assembling the speech data chronologically to form a digit string consisting of numerical digits and/or converted alphabetical characters. The converting step further includes comparing each alphabetical character of the speech data to a mapping table stored in memory and determining a numerical digit corresponding to each alphabetical character of the speech data from the mapping table. Additional steps of the method may include determining whether each numerical digit and alphabetical character of the speech data is recognized, storing each numerical digit and converted alphabetical character of the digit string in a temporary memory location, editing the digit string, and displaying each numerical digit and converted alphabetical character of the digit string. 
     In accordance with a second aspect of the present invention, a method of dialing a telephone via voice activation is disclosed as including the steps of enabling a mode of a processing circuit in the telephone for receiving a dial string, speaking a plurality of numerical digits and/or alphabetical characters into the telephone, converting each spoken alphabetical character into a numerical digit associated therewith, assembling each spoken numerical digit and each converted alphabetical character chronologically as the dial string, and initiating a call on the telephone utilizing the dial string. 
     In accordance with a third aspect of the present invention, a mobile telephone is disclosed as including circuitry for performing telephony operations, a microphone for receiving speech data, and a processing circuit for receiving the speech information and converting it into a corresponding digit string. Since the speech information includes numerical digits and/or alphabetical characters, a non-volatile memory is included for storing a look-up table containing a corresponding numerical digit for each alphabetical character. The mobile telephone may also include a volatile memory for temporarily storing the dial string to enable editing, as well as a display for depicting each numerical digit and each converted alphabetical character of the dial string. 
     In accordance with a fourth aspect of the present invention, a system for creating a digit string from speech data received by a telephone is disclosed, where the speech data includes numerical digits and/or alphabetical characters. The system includes a non-volatile memory for storing a look-up table of corresponding numerical digits for each alphabetical character and a processing circuit for receiving and converting the speech data to a digit string having a plurality of numerical digits in chronological order. The processing circuit converts each alphabetical character of the speech data into a numerical digit. Additionally, the system may include a volatile memory for temporarily storing the digit string and a display connected to the processing circuit for depicting each numerical digit and converted alphabetical character of the digit string. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     While the specification concludes with claims particularly pointing out and distinctly claiming the present invention, it is believed the same will be better understood from the following description taken in conjunction with the accompanying drawings in which: 
     FIG. 1 is a block diagram of a telephone including the system of the present invention; 
     FIG. 2 is a flow chart of the steps by which the method of the present invention is accomplished; and 
     FIG. 3 is an exemplary mapping table in which the alphabetical characters correspond to the numerical digits of a phone keypad. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring now to the drawings in detail, wherein identical numerals indicate the same elements throughout the figures, FIG. 1 depicts schematically a telephone  10  which preferably is portable or otherwise located in a mobile environment like a vehicle. It will be seen that telephone  10  includes a microphone  12 , a speaker  14 , a keypad  16 , a display  18 , an antenna  20 , and certain circuitry for performing telephony operations identified generally by the numeral  22 . Telephony circuitry  22  typically includes a transceiver which operates with antenna  20  to transmit and receive signals. 
     Telephone  10  further includes at least one processing circuit  24  which is connected to various components of telephone  10  and functions to operate it in accordance with certain software modules therein. In accordance with the present invention, where speech data may be entered into telephone  10  via microphone  12 , processing circuit  24  is able to receive such speech data and convert it into a corresponding digit string which can be utilized by telephone  10  in several ways. These include using the digit string to dial a third party number, entering the digit string in a speed dial location, and entering the digit string as a password for telephone  10 . 
     It will be appreciated that the present invention is primarily concerned with the case where the speech data includes numerical digits and/or alphabetical characters. This stems from the fact that while digit strings have been created and used by telephones from speech input containing numerical digits alone or by means of designated code words (e.g., for speed dial locations), none have as yet accounted for and permitted individual alphabetical characters to be entered as speech data. Accordingly, a user of telephone  10  need not perform the mental task of converting a phone number containing an alphabetical character to a numerical digit or the manual task of physical pushing the appropriate key. In this way, entry of an alphanumeric phone number becomes much safer in a vehicle or other similar environment since the user need not direct his attention away from driving to do so. 
     The speech data also preferably includes one of several commands (e.g., dial, store, edit, clear, pause, wait for key input, volume control, and display), which instructs processing circuit  24  how to utilize the digit string. Further, such command signals processing circuit  24  that the digit string is completed. 
     In order for processing circuit to recognize the speech data input by microphone  12 , telephone  10  preferably has a designated operating mode which must be enabled (such as by a certain key on keypad  16 ). An audio coder/decoder  26  is provided to convert the speech data from analog to digital (and likewise converts signals received by telephone  10  from digital to analog so they may be understood through speaker  14 ). Additionally, processing circuit  24  includes software which is able to parse the speech data, as well as recognize the speech data itself. Numerous patents have been obtained relating to speech recognition in a phone. Examples of such patents include U.S. Pat. No. 5,222,121 to Shimada, U.S. Pat. No. 4,644,107 to Clowes et al., and U.S. Pat. No. 5,165,095 to Borcherding. Thus, the present invention does not go toward the particular type or manner of speech recognition itself (e.g., speaker dependent or speaker independent), but rather to a particular application in which alphabetical characters in speech data are converted to a corresponding numerical digit and inserted into a digit string. It will be appreciated, however, that should processing circuit  24  not recognize any of the numerical digits, alphabetical characters, or commands of the speech data, processing circuit  24  causes an error to be reported. 
     Processing circuit  24  interfaces with a non-volatile memory  28  in order to convert each alphabetical character of the speech data to a corresponding numerical digit. This is accomplished via a look-up table stored in non-volatile memory  28 , which preferably corresponds to a mapping table of keypad  16  for telephone  10  (see FIG.  3 ). It will be understood, however, that the look-up table could be configured in any number of ways to provide a numerical digit equivalent for each alphabetical character. A volatile memory  30  is also preferably provided and connected to processing circuit  24  to temporarily store each numerical digit and converted alphabetical character from the speech data in the digit string in the order presented by the speech data. When combined with depicting each numerical digit of the digit string on display  18 , this permits the digit string to be edited before proceeding with the intended telephony operation. An alternative way of verifying the accuracy of the digit string is for processing circuit  24  to convert the digit string back to its original speech data and audibly repeat each numerical digit and alphabetical character through speaker  14 . In this way, editing can occur without requiring a user to look at display  18 . 
     The functional steps accomplished by processing circuit  24  and telephone  10  will be better understood by means of the flow chart in FIG.  2 . As seen therein, telephone  10  must be initiated or otherwise be enabled so as to allow reception of the speech data through microphone  12  for purposes of creating a dial string (see box  50 ). Thereafter, telephone  10  actually collects the speech data which includes numerical digits and/or alphabetical characters (box  52 ) through microphone  12  and audio coder/decoder  26  and parses it (box  54 ) by means of processing circuit  24  so that it is in a form that can be used by the speech recognition module thereof. 
     As seen in decision box  56 , processing circuit first determines whether the speech data received is a recognized numerical digit. If the answer is positive, the numerical digit is entered into the dial string within volatile memory  30  (box  58 ). Should the answer be negative, processing circuit  24  then determines whether the speech data is a recognized alphabetical character (decision box  60 ). Provided an affirmative result is obtained, processing circuit  24  then converts the alphabetical character to its corresponding numerical digit according to the look-up table in non-volatile memory  28  (box  62 ). Thereafter, the converted alphabetical character is inserted into the dial string stored in volatile memory  30  (box  58 ). It will be appreciated that each numerical digit and converted alphabetical character is inserted into the digit string in the order provided by the parsed speech data. In order to permit verification of the digit string&#39;s accuracy, it is preferred that the numerical digits and converted alphabetical characters thereof be depicted on display  18  (box  64 ). Should the speech data not be a recognized alphabetical character (i.e., a negative result from decision box  60 ), then processing circuit  24  causes an error to be reported such as through display  18  (box  66 ). 
     Of course, this process continues for each item (numerical digit or alphabetical character) of the speech data until the digit string is completed, as evidenced by feedback loop  68 . Once the digit string is created within volatile memory  28 , it then can be utilized by telephone  10  to initiate dialing a third party, stored in a speed dial location, entered as a password, or used for any other function of telephone  10  requiring a digit string. Accordingly, it will be seen in FIG. 2 that a preferred option in the logic of processing circuit  24  includes determining whether the speech data is a recognized command (see decision box  70 ) should the answer to decision box  60  be negative. The presence of such a command has the function of indicating the end of the digit string, as well as instructing telephone  10  how to use the digit string. Provided the speech data is a recognized command, processing circuit  24  determines whether the command is to commence dialing telephone  10  (decision box  72 ). If this is the case, processing circuit  24  sends a signal to telephony circuitry  22  to cause a call to originate according to the digit string of box  58  and the applicable air interface standard (box  74 ). Otherwise, processing circuit  24  sends a signal to cause any other command to proceed (box  76 ) using the digit string in box  58  (e.g., store, edit, etc.). Of course, it will be appreciated that should the determination by decision box  70  be negative, processing circuit  24  will cause an error to be reported (box  66 ). 
     Once the appropriate command is processed by processing circuit  24 , telephone  10  will preferably then return to a previous or standard mode of operation where it is not enabled to receive speech data inputs (box  78 ). 
     Having shown and described the preferred embodiment of the present invention, further adaptations of the system and method for creating a digit string for use by a phone from speech data including at least alphabetical character can be accomplished by appropriate modifications by one of ordinary skill in the art without departing from the scope of the invention.