9. A method for the operation of an apparatus for the processing of sales of articles of a product assortment to a customer, in particular store scales, comprising: listening to a conversation between a customer and a salesperson and converting connected spoken words of the conversation into an electrical speech signal; generating a speech recognition result representing the words from the electrical speech signal; comparing the speech recognition result with stored keywords to recognize keywords in the speech recognition result, with at least some of the stored keywords being product names which define a group of keywords; and on the detection, within a preset time window, of a keyword belonging to the group and/or of a permitted combination of keywords, which includes a keyword belonging to the group, outputting a piece of information associated with the detected keyword or with the detected permitted combination or an offer to output the information, wherein the preset time window is activated on the recognition of a keyword belonging to a corresponding group of keywords or on the recognition of a permitted combination belonging to a corresponding group of permitted combinations of keywords.
9. A method for the operation of an apparatus for the processing of sales of articles of a product assortment to a customer, in particular store scales, comprising: listening to a conversation between a customer and a salesperson and converting connected spoken words of the conversation into an electrical speech signal; generating a speech recognition result representing the words from the electrical speech signal; comparing the speech recognition result with stored keywords to recognize keywords in the speech recognition result, with at least some of the stored keywords being product names which define a group of keywords; and on the detection, within a preset time window, of a keyword belonging to the group and/or of a permitted combination of keywords, which includes a keyword belonging to the group, outputting a piece of information associated with the detected keyword or with the detected permitted combination or an offer to output the information, wherein the preset time window is activated on the recognition of a keyword belonging to a corresponding group of keywords or on the recognition of a permitted combination belonging to a corresponding group of permitted combinations of keywords. 11. A method in accordance with claim 9 , wherein a distinction is made between statements of the customer and statements of the salesperson by means of the speech recognition.