A sound recognition apparatus (100) comprises a microphone (110) for capturing a posterior sound signal; and a processing circuit comprising a processor (180). The processing circuit is configured to process the posterior sound signal to derive posterior data, generate, using the processor (180), amalgamated data from the posterior data and anterior data derived from a previously captured anterior signal, determine, by the processor (180), whether there are correlations between the amalgamated data, the posterior data, and the anterior data that indicate that the posterior data matches the anterior data by comparing the posterior data and the amalgamated data, and the anterior data and the amalgamated data, and upon the posterior data matching the anterior data, output, by the processor (180), an indication that the posterior data matches the anterior data.