Abstract:
A method and system for determining a language of a call handled by an automatic call distributor is disclosed. The method includes the steps of detecting the call, sampling an audio portion of the call, fitting a plurality of templates to the sampled portion of the call, and determining a language of the call based upon a best relative fit between one of the plurality of audio templates and the sampled portion of the call.

Description:
FIELD OF THE INVENTION 
     This invention relates generally to telephony, and more particularly, to automatic call distributors. 
     BACKGROUND OF THE INVENTION 
     An automatic call distributor (ACD) is a system that facilitates the management of incoming and outgoing calls at telephone call centers. Traditionally, an ACD consisted of a specialized telephone switch for routing customer calls to available agents. The method for routing such calls is typically based on obtaining an equitable distribution of calls for each agent. 
     Today, like all business entities, call centers are experiencing incredible growth due to an increasingly interconnected, global and digital world. Incident to the operation of call centers is the accumulation of vast quantities of valuable information. In response to the availability of such information, owners of these call centers are demanding ACD systems with more sophisticated information management and channeling capabilities. Thus, modern ACD systems commonly incorporate various management tools including automated call identification, automated agent selection, automated call distribution, automated voice response, data integration, voice messaging, automated outbound call management, and real time displays that forecast load and analyze historical data. 
     Furthermore, modern ACD systems typically use improved methods for routing calls other than the traditional method based on equitable distribution. One such method is skill based routing. Skill based routing is typically based on the identity of the caller or on the number called and enables a call center to route calls to the agent most qualified to handle the customer request. When coupled, for example, with additional services such as a Dialed Number Identification Service (DNIS) that identifies a particular service number called by a customer, skill based routing can greatly increase the productivity of a call center. 
     While skill based methods for routing calls are commonly found in modern ACD systems, there is no known analogous development of a language based method of routing calls. However, in an increasingly global business environment, the need to identify the native language of customers is obvious. For example, when a customer answers the phone during an outdialing campaign, she may not necessarily speak the same language as the agent handling the call. Thus, regardless of any advantages that skill based routing might provide, such language barriers lead to confusion between the agent and customer which ultimately decreases productivity for the call center. 
     In March 1997, the U.S. Census Bureau estimated that the foreign born population of the United States was 25.8 million. This represents the largest foreign born population in United States history and an increase of 30 percent over the 1990 statistics (see Schmidley, A. Dianne and Campbell Gibson, U.S. Census Bureau, Current Population Reports, Series P23-195, Profile of the Foreign Born Population in the United States: 1997, U.S. Government Printing Office, Washington, D.C. 1999). Furthermore, marketing studies and commentaries have suggested that people feel more comfortable conducting business in their native languages (see “Spanish Language Advertising Most Effective, Even For Bilingual”, Minority Markets Alert, Vol. 6, No. 12, Dec. 1, 1994; Hamlyn, Helen, “Speaking the language of your customer”, Telemarketing, Vol. 11, No. 12, Jun. 1, 1993). Therefore, with the significant increase of non-English speaking households in the United States, call centers must be able to identify and service customers in their native languages in order to conduct effective business. 
     SUMMARY OF THE INVENTION 
     Accordingly, the present invention provides a method and system for determining a language of a call handled by an automatic call distributor. The method includes the steps of detecting the call, sampling an audio portion of the call, fitting a plurality of templates to the sampled portion of the call, and determining a language of the call based upon a best relative fit between one of the plurality of audio templates and the sampled portion of the call. 
     Similarly, the automatic call distributor system, comprises, in part, capabilities for detecting a call. Once the call is detected, the system may sample an audio portion of the call and attempt to match the audio sample to one of a plurality of audio templates that has the best relative fit. By doing so, the automatic call distributor is able to determine the language of the call and can route the call to an appropriate response service. Such response services may include, but are not limited to, human agents, voice response units (VRU), or interactive voice response (IVR) applications. If, however, the system is unable to obtain a best relative fit, it may ultimately route the call to a default agent. 
     One of the primary objectives of the invention is to identify the language of a customer who answers the phone during an outdialing campaign. When a customer answers the phone, they typically speak a greeting in their native language. For example, a Spanish speaking person might answer the phone by saying “BUENO”. The automatic call distributor would analyze the voice pattern of this initial greeting and compare it against sample greeting patterns in different languages to determine the customer&#39;s language. 
     Another main objective of the invention is to route the call to a response service capable of servicing the language of the customer. Such a service might be a human agent who can speak the language or an automated voice response unit with messages recorded in the language of the customer. 
     The advantages of identifying and routing a call based on the language of the customer are increased efficiency and productivity at the call center and higher customer satisfaction with call center service. 
     Further objectives, advantages and features of the invention will become apparent from the following detailed description of preferred embodiments of the present invention when taken in conjunction with the accompanying drawings in which like reference numerals designate like elements throughout the different views. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a functional block diagram of the preferred embodiment of the automatic call distributor system of the present invention coupled to an external public switching telephone network (PSTN). 
         FIG. 2  is a functional block diagram of the preferred embodiment of the interactive voice response (IVR) unit within the automatic call distributor of  FIG. 1 . 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring the drawings,  FIG. 1 . illustrates one preferred embodiment of an automatic call distributor (ACD)  100  with language recognition means. The ACD  100  receives inbound calls from and places outbound calls to customers  102  through an external public switching telephone network  104 . The ACD  100  is controlled by a central processing unit (CPU)  106  coupled to a memory unit  108  which contains, in part, software that guides the switch  110  and contains the profile information describing, in part, the language capabilities of the human agents  112  and the voice response units (VRU)  114  that are coupled to the switch  110 . The switch  110  has several ports for connection to human agents  112 , VRUs  114 , and to supervisory and other units (not shown). Each human agent  112  is qualified to handle customer calls in at least one particular language. The agents  112  may each have a control console (not shown) with a keyboard and video display for inputting and retrieving data in response to various types of calls. Similarly, each VRU  114  includes at least one prompting script recorded in at least one particular language to obtain information from customers who speak that language. In one preferred embodiment of the invention, each VRU  114  includes several prompting scripts recorded in several different languages so that the VRU  114  can simultaneously handle several different customer calls in several different languages. Furthermore, the ACD  100  includes an interactive voice response (IVR) unit  116  that embodies the language recognition means. Upon determining the language of a call, this IVR  116  communicates this information to the CPU  106  which then properly routes a customer call to an appropriate agent  112  or VRU  114 . 
     With reference to  FIG. 2 , the IVR  116  of the ACD  100  in  FIG. 1  is also controlled by a CPU  200  coupled to a memory unit  202  which contains in part, language recognition software  206  and a plurality of audio language templates  204 . When the ACD  100  in  FIG. 1  detects the completion of an outbound call, the IVR  116  immediately engages its voice sampling unit  208  which samples the greeting answer of the customer, storing it in the memory unit  202 . The CPU  200  analyzes and processes the sampled greeting of the customer by comparing it against the plurality of audio language templates  204  to find a best relative fit. Once the CPU  200  identifies the language of the sampled greeting of the customer, it conveys this information to the CPU  106  of the ACD  100  in  FIG. 1 . Upon reception of such information, the ACD  100  in  FIG. 1  switches the customer call to an agent  112  or VRU  114  to service the call in the proper language. 
     In an alternative embodiment of  FIG. 1 , the ACD  100  also extracts additional information from the external PSTN  104  when dealing with incoming customer calls. In one embodiment of the invention, such additional information might include a Dialed Number Identification Service (DNIS) to identify which of a plurality of service numbers a customer actually called, or an Automatic Number Identification (ANI) service to identify the number of the calling customer. Such additional information would be used in conjunction with certain databases in order to make an initial determination of the language of the calling customer. 
     For example, in one embodiment, the external PSTN provides the surname of the calling customer to the ACD. The ACD then uses a best guess method to determine the language of the caller corresponding to the surname and switches the call to an appropriate agent or VRU. In an alternative embodiment, the ACD uses the ANI number to identify a geographic location of the calling customer to determine whether there is a specific language associated with that location. For instance, in either of these embodiments, one could envision an IVR in the ACD greeting the calling customer with a salutation in the “best guessed” determined language. The ACD would then analyze the response of the calling customer to confirm that the best guessed language was indeed the proper language to use. If the CPU  200  should determine that the initial language was incorrect, the CPU  200  reconnects the call to the appropriate response service. 
     In another embodiment, the ACD is coupled to an internal database that stores the language used by a repeat customer. Upon obtaining the ANI number of a calling repeat customer, the ACD determines the language of the customer by accessing the database through the ANI number. In yet another embodiment of the invention, the ACD is coupled to a database, internal or external, that provides marketing information associated with the ANI number, including the language of the customer. 
     While a detailed description of the preferred embodiment of the invention has been given, it should be understood that implementation of other variations and modifications of the invention and its various aspects will be apparent to one skilled in the art, and that the invention is not limited by the specific embodiments described. Therefore, it is contemplated to cover the present invention, any and all modifications, variations, or equivalents that fall within the true spirit and scope of the basic underlying principles disclosed and claimed herein.