Tag Archives: audio processor


Enhancing audio with echo effect

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Delay effects are commonly implemented in various audio systems including Karaoke player, guitar amplifier, advanced sound processing equipment, recording studios, television etc. It basically adds an echo to the original audio by repeating the audio after a specified amount of time. Rajkumar Sharma’s new project is about building an echo generator using Holtek’s HT8970 IC, which is an echo/surround effect processor with built-in pre-amplifier, VCO, 20Kb SRAM, A/D and D/A converters as well as delay time control logic. With all these functions built inside the chip, you can easily enhance your audio with an echo effect using a minimal number of external components.

Echo generator

Echo generator

 

Arduino gesture vocalizer

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People with impaired hearing and speech often find difficult to interact with other people, mostly because their sign language is not understood by all. This Arduino-based gesture vocalizer is designed to assist those people to communicate with normal people. The device is built as a wearable glove, which converts the hand gestures into human recognizable audio. Two flex sensors for detecting bending of fingers and one ADXL335 3-axis accelerometer for getting the orientation of hand are embedded on the glove for gesture recognition. For audio conversion, the APR33A3 audio processor chip is used to storing and playing audio messages. An LCD display is also included in the project for the visual display of the message.

Gesture vocalizer

Gesture vocalizer