Detection system and method for mobile device application
A system and method for detecting a non-visual code using an application on a mobile device, where the application is capable of associating the non-visual code with at least one item contained in a transmitted presentation and connecting the mobile device to information about the item in a database associated with the transmitted presentation. The non-visual code may comprise a high frequency signal played alone or with another audio or video signal. A mobile device application executing on a processor of the mobile device performs signal processing on the audio signal of the presentation to extract the high frequency signal. Also contemplated is obtaining information about the visual content and presenting the information on the personal device.
1. A method for processing an audio signal to identify cues which define or relate to product information comprising:
receiving an audio signal using a microphone of a mobile device;
converting the audio signal to a digital format
buffering the audio signal after converting to create buffered data;
performing harmonic analysis on the buffered data to identify signal magnitudes at two or more predetermined frequencies;
performing synchronous symbol recovery on the signal magnitudes resulting from the harmonic analysis to establish characters
performing pattern de-bouncing on the characters based on comparison to one or more predetermined criteria to establish weighted character;
performing pattern parsing and final scoring on the weighted characters to create a data structure with scored cues.
2. The method of claim 1 wherein the predetermined frequencies comprise frequencies at which cues are known to be located in the audio signal.
3. The method of claim 1 wherein the harmonic analysis comprises one or more tuned variant of the Fourier transform.
4. The method of claim 1 wherein the predetermined criteria used during pattern de-bounding comprises one or more of the following factors: known characters (F/R), header/footer, payload integrity, and payload redundancy.
5. The method of claim 1 wherein synchronous symbol recovery further comprises assigning a confidence value to the characters.
6. The method of claim 1 wherein the audio signal comprises the audio signal from a television program.
7. The method of claim 1 , wherein the cue identifies a product or service.
8. The method of claim 1 , wherein the method utilizes a display configured to display product information received from the remote database.
9. The method of claim 1 , wherein the method utilizes memory storing non-transitory machine readable code configured to enable the person to purchase the product identified by the cue.
10. The method of claim 1 , wherein the cue is at a frequency above 15 kilohertz.