Sound identification utilizing periodic indications

A non-transitory computer program product having instructions embodied therewith, the instructions executable by a speech recognition system that includes a processor or programmable circuitry to cause the processor or programmable circuitry to perform a method comprising:

• performing a speech recognition operation on the audio signal data to decode the audio signal data into a textual representation based on the estimated sound identification information from a neural network having periodic indications and components of a frequency spectrum of the audio signal data inputted thereto,
• wherein the neural network includes a plurality of fully-connected network layers having a first layer that includes a plurality of first nodes and a plurality of second nodes, and wherein the method further comprises training the neural network by initially isolating the periodic indications from the components of the frequency spectrum in the first layer by setting weights between the first nodes and a plurality of input nodes corresponding to the periodic indications to 0.