Hearing Science: Digital Signal Processing Questions & Answers

Hearing Science: Digital Signal Processing Questions & Answers After digital signal processing, what converts the digital signal back into an analog signal before transmitting it to the ear via the receiver? - CORRECT ANSWER - The transmitter converts the electrical signal back into acoustic energy. Explain the conversion of an acoustic signal - CORRECT ANSWER - The acoustic signal is the analog signal. It is picked up by the microphone, which immediately converts it into a digital signal. When it is ready to be transmitted back into the environment, the speaker converts the digital signal back into the acoustic/analog signal. How can digital codes be used? - CORRECT ANSWER - That signal can be used to store, process, and reproduce a signal. How do the number of snapshots taken influence the representation of the original wave? - CORRECT ANSWER - The more snapshots, the more natural or continuous that signal looks. The fewer snapshots, the less representative of that original signal, also the more distorted that sound. How do you get the Nyquist frequency from the sampling rate? - CORRECT ANSWER - Example: 64,000Hz (Sampling Rate) = 32,000Hz (Nyquist Frequency). (Division to find Nyquist Frequency from sampling rate. How do you get the sampling rate from the Nyquist frequency? - CORRECT ANSWER - Example: Signal Frequency = 16,000Hz (Nyquist Frequency) = Sampling Rate = 32,000 Hz. (Multiplication to find sampling rate). In a hearing aid, digital signal processing takes place. What filters are used and why? - CORRECT ANSWER - When we look at hearing aids, we use low pass filters in the area between 4,000-6,000Hz. When using low pass filters, we set the low pass filters in the high frequency range. Everything lower than that set rate will pass through and everything higher will not pass through. Hearing aids can have feedback, like squealing, so low pass filters are better and can cut out the feedback of hearing aids. In what types of modern technology do we find DSP? - CORRECT ANSWER - They are used for electrical components like streaming devices, Bluetooth, hearing aids, and wireless cell phones.