The circuit outputs a delayed version of an input audio signal. Depending on the amount of memory implemented and the sampling rate selected, it can store from 3 seconds to 8 seconds of audio. The audio input will be delayed by an amount selectable by the user.
This device can be used to produce a delay for many purposes. Some possible applications are:
- Sound effects , such as echo, can be produced by adding a delay to an input signal.
- This device can produce an effect which is sometimes referred to as “Delayed Auditory Feedback”. This effect has been used to help aid those who stutter.
- Another application of such a device would be in a “Speech Jammer”. Such a device records a person speaking and then plays the audio back at a delay, which causes most people to get confused and thereby disrupts their speaking. Using the device for this purpose would require a directional microphone and directional speaker.
- The device can also be used to delay the audio from a television broadcast. In my research, I found that some people prefer to use a separate, radio broadcast for the play by play or commentary for sporting events, and as such they wanted to be able to introduce a delay to synchronize a separate audio source to the television broadcast.
- The circuit can be used sort of like a TiVo, but for audio only. By changing the delay setting, you can go back as far back as the buffer size permints (only 8 seconds max in this design) to catch something you missed.
At any rate, the device described here can be a lot of fun to play and experiment with. The input range is controllable from 0 seconds to the maximum delay by means of an analog input. This analog input can simply be driven by a potentiometer, or from an external signal. Modulating the delay input with different waveforms can produce interesting sound effects.