Audible announcement in an electronic cash register
BACKGROUND AND SUMMARY OF THE INVENTION 
     The present invention relates to an electronic cash register and, more particularly, to an electronic cash register which provides an audible announcement on the transaction data. 
     The conventional electronic cash register comprises an electronic digital display for displaying the transaction data, and a printer system for printing out the transaction data. There is a possibility that the displayed transaction data is erroneously read. The reliability of the electronic cash register will be greatly enhanced if the transaction data is also announced through a speaker system. 
     Accordingly, an object of the present invention is to provide an electronic cash register which provides an audible announcement of the transaction information. 
     Another object of the present invention is to provide a control system for providing a synthetic speech announcement in accordance with the transaction data stored in an electronic cash register. 
     Other objects and further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. It should be understood, however, that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description. 
     To achieve the above object, pursuant to an embodiment of the present invention, a synthetic speech sound generation system is provided in an electronic cash register for providing an audible announcement of the total amount of the transaction when a print completion indication signal is developed from a printer system. 
     In a preferred form, the electronic cash register also provides an audible announcement of the total money received from the customer, and the change which should be handed to the customer. Moreover, the electronic cash register develops the synthetic speech of a particular message, for example, &#34;Thank you for your patronage.&#34; when the transaction is completed. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The present invention will be better understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention and wherein: 
     FIG. 1 is a perspective view of an embodiment of an electronic cash register of the present invention; and 
     FIG. 2 is a block diagram of a control circuit included in the electronic cash register of FIG. 1. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIG. 1 shows an electronic cash register of the present invention. 
     An electronic cash register 1 mainly comprises a keyboard unit 2 for introducing various transaction information, a digital display unit 3 for displaying the introduced transaction information and a calculation result performed by the electronic cash register 1, and a printer system 4 for printing out a desired data on a journal paper or a receipt slip. The electronic cash register 1 further comprises a drawer 5 for containing the money, and a speaker system 6 for audible announcement purposes. 
     FIG. 2 shows a control circuit of the electronic cash register of FIG. 1. 
     The keyboard unit 2 comprises numeral keys 7 and function keys 10. The transaction amount information is introduced from the numeral keys 7 into a central processor unit 9 through a key encoder 8. Then, the function keys 10 are actuated to introduce the information related to the kind of transaction into a key determination circuit 11. In response to actuation of any one of the function keys 10, the amount information temporarily stored in the central processor unit 9 is introduced into and memorized in a predetermined memory section in a storage circuit 13 through an input/output control circuit 14. The memory section is determined in accordance with the actuated function key, and the memory section is selected through an address counter 12. 
     The thus introduced transaction amount information is applied to a digital display unit 17 through an OR gate 15 for display purposes, and to a printer system 18 through an OR gate 16 for printing out the transaction data on a journal paper or a receipt slip. 
     When one set of transaction data entry related to one specific customer is completed, a transaction completion instruction key 19, for example, a total key, included in the function keys 10 is actuated. In response to the actuation of the transaction completion instruction key 19, the key determination circuit 11 develops a control signal for effecting the total summing operation within the central processor unit 9, and the total sum is applied to the digital display unit 17 through the OR gate 15 and to the printer system 18 through the OR gate 16. Moreover, the transaction amount information stored in the respective memory sections of the storage circuit 13 is transferred to the corresponding accumulating sections in the storage circuit 13 for accumulating the transaction data by each kind of the transaction. 
     The electronic cash register of the present invention further comprises a speech data storage unit 21 for storing various kinds of synthetic speech data P 0  through P n , and a selection circuit 22 for selecting a desired synthetic speech data stored in the speech data storage unit 21. 
     When the transaction completion instruction key 19 is actuated, an AND gate 20 is made conductive, whereby a key code signal derived from the key determination circuit 11 is introduced into the selection circuit 22. The selection circuit 22 develops a selection signal for selecting a specific synthetic speech data P 0  stored in the speech data storage unit 21. The synthetic speech data P 0  is for announcing the total amount of the transaction assigned to a specific customer and, more particularly, is for announcing, for example, &#34;The total amount is . . . &#34;. The thus selected synthetic speech data P 0  for anouncing &#34;The total amount is . . . &#34; is transferred to a synthesis circuit 23. 
     On the other hand, the total sum calculated by the central processor unit 9 is applied to a synthetic speech converter 25 through a signal line 24. A synthetic speech data related to the total sum is developed from the synthetic speech converter 25 and applied to the synthesis circuit 23. Accordingly, an output signal of the synthesis circuit 23 is a synthetic speech data for announcing, for example, &#34;The total amount is  5,500.&#34;. That is, the synthetic speech converter 25 stores various synthetic speech data for announcing &#34;zero&#34;, &#34;one&#34;, . . . , &#34;nine&#34;. The synthetic speech data stored in the synthetic speech converter 25 is selected in accordance with the numeral data derived from the central processor unit 9. 
     The thus obtained synthetic speech data derived from the synthesis circuit 23 is applied to a digital-to-analog converter 28 via an OR gate 26 and an AND gate 27. An output signal developed from the digital-to-analog converter 28 is applied to a speaker 31 through a low-pass filter 29 and a speaker driver circuit 30 for providing an audible announcement, that is, &#34;The total amount is  5,500.&#34;. 
     In addition to the above-mentioned operation, when the transaction completion instruction key 19 is actuated, a holding circuit 32 is activated to make conductive an AND gate 33. On the other hand, when the printer system 18 completes the printing out operation of the total sum of the transaction assigned to the specific customer, a detection circuit 34 develops a print completion detection output toward the AND gate 33. An output signal of the AND gate 33 is applied to the selection circuit 22 for selecting a synthetic speech data P 3  stored in the speech data storage unit 21. The synthetic speech data P 3  is for announcing &#34;Thank you for your patronage.&#34;. The thus selected synthetic speech data P 3  is applied to the digital-to-analog converter 28 through the OR gate 26 and the AND gate 27. In this way, the speaker 31 develops the synthetic speech announcement of &#34;Thank you for your patronage.&#34;. The holding circuit 32 continuously develops an enabling signal until the synthetic speech data P 3  is selected. 
     Now assume that the transaction total sum is  5,500, and the customer hands a ten-thousand yen bill to the clerk. The clerk introduces the numeral information &#34;10,000&#34; through the numeral keys 7. The thus introduced numeral information is applied to the central processor unit 9 through the key encoder 8, and displayed on the digital display unit 17 and, moreover, printed out onto a receipt slip by the printer system 18. 
     In response to the actuation of the numeral keys 7, a control signal is applied to the selection circuit 22 through an AND gate 35 for selecting a synthetic speech data P 1  stored in the speech data storage unit 21. The synthetic speech data P 1  is for announcing &#34;The handed money is . . . &#34;. The thus selected synthetic speech data P 1  is applied to a synthesis circuit 36 through an OR gate 38. The numeral information &#34;10,000&#34; temporarily stored in the central processor unit 9 is applied to a synthetic speech converter 37 which develops a synthetic speech data for announcing &#34; 10,000&#34; toward the synthesis circuit 36, whereby the synthesis circuit 36 develops a synthetic speech data for announcing &#34;The handed money is  10,000&#34;. 
     The thus obtained synthetic speech data is applied to the digital-to-analog converter 28 through the OR gate 26 and the AND gate 27. In this way, the speaker 31 develops a synthetic speech announcement of &#34;The handed money is  10,000.&#34;. 
     One input terminal of the AND gate 35 is connected to receive an output signal derived from a holding circuit 40. The holding circuit 40 is activated by actuation of the transaction completion instruction key 19, and the activated condition is maintained until the announcement related to the handed money is completed. 
     Thereafter, the clerk actuates a handed money instruction key 39 included in the function keys 10 for indicating that the now introduced numeral information relates to the handed money. The key determination circuit 11 develops a control signal for calculating the change. The central processor unit 9 develops the numeral information related to the change, namely, &#34;4,500&#34; toward the digital display unit 17 and the printer system 18. 
     In response to actuation of the handed money instruction key 39, an AND gate 41 is made conductive to introduce the key code signal into the selection circuit 22. The selection circuit 22 selects a synthetic speech data P 2  stored in the speech data storage unit 21. The synthetic speech data P 2  is for announcing the information &#34;The change is . . . &#34;. The thus selected synthetic speech data P 2  is applied to the synthesis circuit 36 through the OR gate 38. Moreover, the numeral information &#34;4,500&#34; calculated by the central processor unit 9 is introduced into the synthetic speech converter 37. The synthetic speech converter 37 develops a synthetic speech data for announcing &#34; 4,500&#34; toward the synthetic circuit 36. Accordingly, the speaker 31 develops a synthetic speech announcement of &#34;The change is  4,500.&#34;. 
     While the above-mentioned synthetic speech operation is performed, a holding circuit 43 is activated through an OR gate 42. Accordingly, the AND gate 27 is made conductive until the respective audible announcement is completed. An operation flow of the electronic cash register is programmed in a P-ROM 44 for controlling the operation of the central processor unit 9. 
     The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications are intended to be included within the scope of the following claims.