S18: Audio Spectrum Analyzer with Graphics Display - Revision history

Proj user5 at 15:31, 27 May 2018

2018-05-27T15:31:05Z

Proj user5: /* Other Screen Displays */

2018-05-27T15:11:15Z

‎Other Screen Displays

Proj user5: /* Other Screen Displays */

2018-05-27T15:10:03Z

‎Other Screen Displays

Proj user5: /* Other Screen Displays */

2018-05-27T15:07:33Z

‎Other Screen Displays

Proj user5: /* RGB LED Matrix */

2018-05-27T15:06:51Z

‎RGB LED Matrix

Proj user5: /* MP3 Audio Decoder */

2018-05-27T14:51:02Z

‎MP3 Audio Decoder

Proj user5: /* Hardware Interface */

2018-05-27T14:50:46Z

‎Hardware Interface

Proj user5: /* MP3 Audio Decoder */

2018-05-27T14:29:48Z

‎MP3 Audio Decoder

Proj user5: /* MP3 Audio Decoder */

2018-05-27T14:27:51Z

‎MP3 Audio Decoder

Proj user5: /* MP3 Audio Decoder */

2018-05-27T14:25:57Z

‎MP3 Audio Decoder

@@ Line 4: / Line 4: @@
 == '''Abstract''' ==
-Music is an essential element of human life. When someone hears a certain piece of melody that represents their current mood, they will likely to have body responses and sentimental fulfillment to it. Nowadays, music are often recorded electronically. In such conditions, the music is represented by different frequency bands that operate together. While the sound travels through the air and goes into our ears, one may wonder why couldn't we also visualize the different frequency bands through our eyes, as this essentially provides a dynamic graphical layout of the melody as time goes on.Therefore, our team set foot on this project, which uses an RGB LED matrix to display graphics based on the dynamic MP3 audio frequencies. An MP3 audio decoder board will be used to connect to one of the SJOne board, which contains the MP3 files in its SD card, to decode MP3 files; and it then send the decoded data to the graphic equalizer. The user will be able to see graphics on the RGB LED matrix instantly while playing MP3 files. We also implemented some control buttons to modify the playing music. The functionalities include pause music, resume music, skip music, display playing modes, show the matrix's display and rotate the display with a different orientation.
+Music is an essential element of human life. When someone hears a certain piece of melody that represents their current mood, they will likely to have body responses and sentimental fulfillment to it. Nowadays, music is often recorded electronically. In such conditions, the music is represented by different frequency bands that operate together. While the sound travels through the air and goes into our ears, one may wonder why couldn't we also visualize the different frequency bands through our eyes, as this essentially provides a dynamic graphical layout of the melody as time goes on. Therefore, our team set foot on this project, which uses an RGB LED matrix to display graphics based on the dynamic MP3 audio frequencies. An MP3 audio decoder board will be used to connect to one of the SJOne board, which contains the MP3 files in its SD card, to decode MP3 files; and it then sends the decoded data to the graphic equalizer. The user will be able to see graphics on the RGB LED matrix instantly while playing MP3 files. We also implemented some control buttons to modify the playing music. The functionalities include pause music, resume music, skip music, display playing modes, show the matrix's display and rotate the display with a different orientation.
 == '''Objectives & Introduction''' ==
 === Introduction ===
-Our team split the project into four different parts: The audio decoder, the audio analyzer, the RGB LED Matrix, and the PCB design. Thus, two of our team members split the hardware and the software parts, some they worked together, some they worked individually. The other team member wanted to work on the PCB design. The audio decoder decodes the MP3 files and outputs an analog signal that represents the sound. The Graphic Equalizer part converts the analog audio input to an digital output that can be parsed by the RGB LED Matrix. In other words, it created a formatted data representation. The RGB LED Matrix part mainly focused on parsing the converted data and drive the RGB LED screen to display the dynamic frequencies of the signals.
+Our team split the project into four different parts: The audio decoder, the audio analyzer, the RGB LED Matrix, and the PCB design. Thus, two of our team members split the hardware and the software parts, some they worked together, some they worked individually. The other team member wanted to work on the PCB design. The audio decoder decodes the MP3 files and outputs an analog signal that represents the sound. The Graphic Equalizer part converts the analog audio input to a digital output that can be parsed by the RGB LED Matrix. In other words, it created a formatted data representation. The RGB LED Matrix part mainly focused on parsing the converted data and drive the RGB LED screen to display the dynamic frequencies of the signals.
 === Objectives ===
@@ Line 321: / Line 321: @@
 ==== Graphic Equalizer ====
-The diagram below shows how the MSGEQ7 chip outputting the analog signals. The software needs GPIO pins to generate the strobe signal and reset signal. The strobe signal needs to be precisely controlled in order to read the analog values properly, so we follow in this strobe timing diagram to read the analog values. At first, we initialize by setting and clear the reset pin, then read the first values 72us after set and clear the stobe pin, and repeat it to read all other bands.
+The diagram below shows how the MSGEQ7 chip outputting the analog signals. The software needs GPIO pins to generate the strobe signal and reset signal. The strobe signal needs to be precisely controlled in order to read the analog values properly, so we follow in this strobe timing diagram to read the analog values. At first, we initialize by setting and clear the reset pin, then read the first values 72us after setting and clearing the strobe pin and repeat to read all other bands.
 [[File:CmpE244 S18 FRITOS Strobe timing diagram.png|none|thumb|500px|Strobe Timing Diagram]]

@@ Line 370: / Line 370: @@
 * if(row==1 && col==8+spin && col <24)            set_color_top;
 * else if(col==23 && spin > 15 && spin-row==15)   set_color_top;
 <pre>

@@ Line 365: / Line 365: @@
 ======Other Screen Displays======
-For other screen display like splash, pause, and skip screens, we use a two-dimensional array, and create the screen by setting each LED's color in the array one by one. In the skip screen, we use a simple algorithm to implement the spinning dot around the screen.
+For other screen display like splash, pause, and skip screens, we use a two-dimensional array, and create the screen by setting each LED's color in the array one by one. In the skip screen, we use a simple algorithm to implement the spinning dot around the screen. The RGB LED matrix is driven the same way as in previous '''Hardware Interface''' section.
 A snippet algorithm looks like this:

@@ Line 367: / Line 367: @@
 For other screen display like splash, pause, and skip screens, we use a two-dimensional array, and create the screen by setting each LED's color in the array one by one. In the skip screen, we use a simple algorithm to implement the spinning dot around the screen.
-A sinnept algorithm looks like this:
+A snippet algorithm looks like this:
 * if(row==1 && col==8+spin && col <24)            set_color_top;
 * else if(col==23 && spin > 15 && spin-row==15)   set_color_top;

@@ Line 362: / Line 362: @@
 ======Dropping Entertainment Algorithm======
-It uses the intensity of light from light show algorithm. In mode one, it will create a dropping bar that will be pushing up to the row of the recent highest values, and drop a little as time pass, and will be push up anain when the current row is lower than the recent highest values.  In mode two, it will drag the existing lights row up to the recent highest values and drop a little as time pass. The difference between mode one and two is that every column has its own counter, so the dropping speed can be varied for each column, which makes them look like 32 different signal bands.
+It uses the intensity of light from light show algorithm. In mode one, it will create a dropping bar that will be pushing up to the row of the recent highest values, and drop a little as time pass, and will be push up again when the current row is lower than the recent highest values.  In mode two, it will drag the existing lights row up to the recent highest values and drop a little as time pass. The difference between mode one and two is that every column has its own counter, so the dropping speed can be varied for each column, which makes them look like 32 different signal bands.
 <pre>

@@ Line 228: / Line 228: @@
 ===== MP3 Audio Decoder =====
-[[File:File:CmpE244 S18 FRITOS Audio Decoder Block Diagram.png|right|thumb|230px|Audio Decoder Block Diagram]]
+[[File:CmpE244 S18 FRITOS Audio Decoder Block Diagram.png|right|thumb|230px|Audio Decoder Block Diagram]]
 The audio decoder was driven by the several pins mentioned in Figure 1 from the '''Hardware Design''' section. Its main interface is SPI, which is great for transferring large amounts of bytes within a short amount of time. This is especially useful for live audio streaming, otherwise, there would be many glitches or a slow down of audio playback.

← Older revision		Revision as of 14:50, 27 May 2018
Line 228:		Line 228:

	===== MP3 Audio Decoder =====		===== MP3 Audio Decoder =====
		+	[[File:File:CmpE244 S18 FRITOS Audio Decoder Block Diagram.png\|right\|thumb\|230px\|Audio Decoder Block Diagram]]
	The audio decoder was driven by the several pins mentioned in Figure 1 from the '''Hardware Design''' section. Its main interface is SPI, which is great for transferring large amounts of bytes within a short amount of time. This is especially useful for live audio streaming, otherwise, there would be many glitches or a slow down of audio playback.		The audio decoder was driven by the several pins mentioned in Figure 1 from the '''Hardware Design''' section. Its main interface is SPI, which is great for transferring large amounts of bytes within a short amount of time. This is especially useful for live audio streaming, otherwise, there would be many glitches or a slow down of audio playback.

@@ Line 237: / Line 237: @@
 * Step 1:  Disable the data pin and chip select pin, for modifying settings over SCI.
 * Step 2:  Set volume rate, and increase the clock frequency of the audio decoder.
-* Step 3:  Open MP3 file to start playing from SJOne and load the first 32 bytes into buffer.
+* Step 3:  Open MP3 file to start playing from SJOne.
 * Step 4:  Enable the chip select pin, and enter while loop.
-* Step 5:  Load next 32 bytes, take semaphore, enable data pin, send first 32 bytes, disable data pin, give semaphore, and wait for status signal from audio decoder.
+* Step 5:  Load next 32 bytes, take semaphore, enable data pin, send 32 bytes, disable data pin, give semaphore, and wait for status signal from audio decoder.
 * Step 6:  Repeat step 5 until there are no more bytes from the loaded MP3 file.
 * Step 7:  Disable chip select pin, close MP3 file.

← Older revision		Revision as of 14:25, 27 May 2018
Line 231:		Line 231:

	The SJOne's audio decoder driver included opening & reading the .mp3 files that were loaded onto the microSD card, which was inserted into the microSD card slot on the SJOne board, not the audio decoder board.		The SJOne's audio decoder driver included opening & reading the .mp3 files that were loaded onto the microSD card, which was inserted into the microSD card slot on the SJOne board, not the audio decoder board.
		+
		+	In order to drive the MP3 audio decoder, there are a few steps need to do:
		+
		+	* Step 0: Initialization. Set 5 pins as GPIO Output, while the other 3 are SPI format (MOSI, MISO, SCLK).
		+	* Step 1: Disable the data pin and chip select pin, for modifying settings over SCI.
		+	* Step 2: Set volume rate, and increase the clock frequency of the audio decoder.
		+	* Step 3: Open MP3 file to start playing from SJOne and load the first 32 bytes into buffer.
		+	* Step 4: Enable the chip select pin, and enter while loop.
		+	* Step 5: Take semaphore, enable data pin, send first 32 bytes, disable data pin, give semaphore, and wait for status signal from audio decoder.
		+	* Step 6: Repeat step 5 until there are no more bytes from the loaded MP3 file.
		+	* Step 7: Disable chip select pin, close MP3 file.
		+	* Step 8: Start at step 3 if there are more MP3 files to be played.

	===== Graphic Equalizer =====		===== Graphic Equalizer =====