Massive Audio D2500.1 block series User Manual download pdf (Page 7)

Figure 2: Block Diagram

Our keystone correction system can be divided into roughly four functional

components:

1. Accelerometer interface

2. Perspective transformation

3. I/O (Input/Output) interface

4. Audio system

Each functional component handles a speciﬁc collection of tasks, and is fur-

ther broken down into a set of one or more modules.

3.1 Accelerometer interface

The accelerometer presents a SPI interface for data transfer. The par to ser

module converts a multi-bit value to a serial stream of bits for transfer to the

accelerometer. The ser to par module converts a serial stream of bits read

from the accelerometer to a multi-bit value of desired width. The moving avg

module computes the average of 32 accelerometer readings. This is done to

counteract some of the noise in the accelerometer readings. The acc module

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Massive Audio D2500.1 block series User Manual Page 7