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AudioGuardian v1.0 (Beta)
Mobile Sound Notifier
Team Members
Eric Hertz
Brian Garfinkel
Jeff Wang
Torrey Umland
Yin Lok Ho
Mentor: Jeff Wilhelm
Description
AudioGuardian is a mobile Java application (J2ME) for use on Java-enabled mobile phones. The user's phone
records surrounding noise and triggers alerts when it identifies interesting noises such as car horns, fire
alarms, gunshots, and sirens. This application was created for people who are hearing impaired and might have
difficulty knowing when they are in a dangerous situation. The project records emergency signals that people
take for granted and makes them available to those who are hearing impaired. It was created as a part of
Project:Possibility and SS12:UCLA 2009.
Challenges
The application uses a discrete Fourier transform algorithm to convert a signal in the time domain into a
signal in the frequency domain. This distribution allows the application to identify specific sounds by
matching the measured frequency against a known sample frequency. The algorithm behind this was extremely
complicated to implement, because every microphone has a different DC offset. The application has a
calibration function that will allow the user to set the DC offset function for their specific microphone.
This alleviates any problems encountered by differences between hardware platforms. Porting Java to J2ME was
also difficult to implement. J2ME is not well documented on the Internet, so there was some difficulty in
learning how to program a mobile phone. There were some difficulties in processing the audio stream into a
byte array, since the application has to extract the sound data without having the file header in the stream
as well. The application has to remove the file header and then store the audio stream into a data structure,
otherwise the application will encounter some issues with displaying the graph of the Fourier transform. There
were also some challenges in using multithreading. The application runs in a loop that listens for commands.
However, the command thread cannot be interrupted to perform recording tasks. Thefore, the application has to
run any recording operations in a separate thread. There were some issues with integrating the separate
threads so that they worked in sync with one another.
Design
This application is implemented in J2ME, which is a subset of Java specifically designed for mobile phones.
AAnalyzer class
This class analyzes the amplitude of the sound file and returns the maximum amplitude at any point in the
sample file. It can also return the number of samples with levels above a given threshold value. It can get
the average amplitude of the entire sample.
AudioGuardian class
This class is the driver class for the entire application. It implements a CommandListener that runs continually in a thread and executes commands as the user inputs them. It also creates new threads as needed for recording operations. It generates the GUI for the entire application and runs through the menus.
CAboutScreen class
This class displays the credit screen using the Form super class.
Calibrator class
This class reads in an arbitrary amount of sound data and takes the average of the amplitudes. It then
computes the base offset for the microphone. This is useful for the application since there are many
differences between different microphones. Without this, the graph would have no way to normalize itself.
CCalibrationScreen class
This class displays the screen that the user sees while calibration is going on.
CMatchableSound class
This class holds the attributes of the sounds that the application is trying to match. It has a method that
will perform matching between a given sound file and a recorded stream.
COptionScreen class
This class displays the "Config" screen. It holds all the different settings that the user can select.
COptionDb class
This class encapsulates the RecordStore and provides a much nicer interface for working with RecordStores.
CStartupScreen class
This class displays the logo on start up.
DFT class
This class performs the discrete Fourier transform. It returns an array of DFT pairs. Each DFT pair contains a
frequency and its corresponding amplitude (also known as a DFTpair).
DFTpair class (extends Comparable)
This is the interface that defines what a DFT pair is.
Float11 class
This is a math class that provides functions not present in the standard J2ME API.
FloorLevel class
This class defines a Double object that is used to store the base microphone offset.
Graph class
This class displays the waveform of the sound signal. It also displays a bar graph of the discrete Fourier
transform. It also provides functions to allow the user to find the highest level frequency and an assorted
array of frequencies based on the sound input.
Monitor class
This class listens for sound input and stores that sound input into a DFT array. It sorts the sound file by
amplitude.
QuickSort class
This class defines a QuickSort algorithm for use by the Monitor class.
Schedule of Progress
Day One: Saturday, January 31, 2009
8:30 AM: Arrive at Boelter and prepare for the project
9:00 AM - 1 PM: Work on design and basic implementation
1 PM - 1:30 PM: Eat lunch
1:30 PM - 6 PM: Finish basic implementations and work on defining the discrete Fourier transform
6 PM - 6:30 PM: Eat dinner
6:30 PM - 11:59 PM: Work on advanced implementations and GUI
Day Two: Sunday, February 1, 2009
12:00 AM - 3:45 AM: Preliminary integration, work on GUI, extension of the project
3:45 AM: Walk back to dorms to sleep
9:00 AM: Arrive at Boelter to continue work
9:00 AM - 1 PM: Work on integration of the code, work on extending the scope of the project
1 PM - 1:30 PM: Eat lunch
1:30 PM - 6:00 PM: Finish integrating code, write documentation, prepare presentation and demo
6:00 PM - 6:30 PM: Eat dinner
6:30 PM - Close: Presentations and demonstrations

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Creative Commons Legal Code
BSD 3-Clause License
CC0 1.0 Universal
Copyright (c) 2018, Oscar Gomez
All rights reserved.
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#!/usr/bin/env/python3
# encoding: utf-8
'''
ripr -- shortdesc
ripr is a small app to record shoutcast or mp3 streams from the internet
It defines classes_and_methods
@author: Adam Garcia
@copyright: 2013 All rights reserved.
@license: MIT
'''
import sys
import os
import logging
from urllib.request import urlretrieve
from argparse import ArgumentParser
from argparse import RawDescriptionHelpFormatter
from datetime import date
import time
import signal
import datetime
import multiprocessing
__all__ = []
__version__ = 0.1
__date__ = '2013-12-23'
__updated__ = '2013-12-23'
now = time.time()
DEBUG = 0
TESTRUN = 0
PROFILE = 0
current_year = date.today().strftime("%Y")
def signal_handler(signal, frame):
print('You pressed Ctrl+C, quitting!')
quit(0)
signal.signal(signal.SIGINT, signal_handler)
def get_seconds(s):
l = s.split(':')
return int(l[0]) * 3600 + int(l[1]) * 60 + int(l[2])
def main(argv=None): # IGNORE:C0111
'''Command line options.'''
if argv is None:
argv = sys.argv
else:
sys.argv.extend(argv)
program_name = os.path.basename(sys.argv[0])
program_version = "v%s" % __version__
program_build_date = str(__updated__)
program_version_message = '%%(prog)s %s (%s)' % (program_version,
program_build_date)
program_shortdesc = __import__('__main__').__doc__.split("\n")[1]
program_license = '''%s
Created by ${user_name} on %s.
Copyright ${year} ${organization_name}. All rights reserved.
The MIT License (MIT)
Copyright (c) <current_year> Adam Garcia
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
USAGE
''' % (program_shortdesc, str(__date__))
# Setup argument parser
parser = ArgumentParser(description=program_license,
formatter_class=RawDescriptionHelpFormatter)
parser.add_argument("-v", "--verbose",
action="store_true",
help="Turns on verbose logging")
parser.add_argument(dest="url",
help="""URL to record""", metavar="URL")
parser.add_argument(dest="rec_time",
help="""Duration to record in HH:MM:SS format""",
metavar="HH:MM:SS")
parser.add_argument("--path", "-p", dest='paths',
help="""paths to folder(s) to record
[default: %(default)s]""", metavar="PATH",
nargs='?', default="output.mp3", const="blabla")
args = parser.parse_args()
paths = args.paths
verbose = args.verbose
rec_time = args.rec_time
url = args.url
time_limit = get_seconds(rec_time)
def callback(count, blocksize, filesize):
elapsed = time.time() - now
if elapsed > time_limit:
raise ValueError("The recording has elapsed past the set time")
try:
urlretrieve(url, paths, callback)
except ValueError as ve:
print("Times up!")
if __name__ == "__main__":
if DEBUG:
sys.argv.append("-h")
sys.argv.append("-v")
sys.argv.append("-r")
if TESTRUN:
import doctest
doctest.testmod()
if PROFILE:
import cProfile
import pstats
profile_filename = 'streamer.ripr_profile.txt'
cProfile.run('main()', profile_filename)
statsfile = open("profile_stats.txt", "wb")
p = pstats.Stats(profile_filename, stream=statsfile)
stats = p.strip_dirs().sort_stats('cumulative')
stats.print_stats()
statsfile.close()
sys.exit(0)
sys.exit(main())

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#!/usr/bin/env bash
function output_entry() {
echo "$1=$2"
}
function parse_array() {
local current_path="${1:+$1.}$2"
local current_scope="root"
local current_index=0
while [ "$chars_read" -lt "$INPUT_LENGTH" ]; do
[ "$preserve_current_char" == "0" ] && chars_read=$((chars_read+1)) && read -r -s -n 1 c
preserve_current_char=0
c=${c:-' '}
case "$current_scope" in
"root") # Waiting for new object or value
case "$c" in
'{')
parse_object "$current_path" "$current_index"
current_scope="entry_separator"
;;
']')
return
;;
[\"tfTF\-0-9])
preserve_current_char=1 # Let the parse value function decide what kind of value this is
parse_value "$current_path" "$current_index"
preserve_current_char=1 # Parse value has terminated with a separator or an array end, but we can handle this only in the next while iteration
current_scope="entry_separator"
;;
esac
;;
"entry_separator")
[ "$c" == "," ] && current_index=$((current_index+1)) && current_scope="root"
[ "$c" == "]" ] && return
;;
esac
done
}
function parse_value() {
local current_path="${1:+$1.}$2"
local current_scope="root"
while [ "$chars_read" -lt "$INPUT_LENGTH" ]; do
[ "$preserve_current_char" == "0" ] && chars_read=$((chars_read+1)) && read -r -s -n 1 c
preserve_current_char=0
c=${c:-' '}
case "$current_scope" in
"root") # Waiting for new string, number or boolean
case "$c" in
'"') # String begin
current_scope="string"
current_varvalue=""
;;
[\-0-9]) # Number begin
current_scope="number"
current_varvalue="$c"
;;
[tfTF]) # True or false begin
current_scope="boolean"
current_varvalue="$c"
;;
"[") # Array begin
parse_array "" "$current_path"
return
;;
"{") # Object begin
parse_object "" "$current_path"
return
esac
;;
"string") # Waiting for string end
case "$c" in
'"') # String end if not in escape mode, normal character otherwise
[ "$current_escaping" == "0" ] && output_entry "$current_path" "$current_varvalue" && return
[ "$current_escaping" == "1" ] && current_varvalue="$current_varvalue$c" && current_escaping=0
;;
'\') # Escape character, entering or leaving escape mode
current_escaping=$((1-current_escaping))
current_varvalue="$current_varvalue$c"
;;
*) # Any other string character
current_escaping=0
current_varvalue="$current_varvalue$c"
;;
esac
;;
"number") # Waiting for number end
case "$c" in
[,\]}]) # Separator or array end or object end
output_entry "$current_path" "$current_varvalue"
preserve_current_char=1 # The caller needs to handle this char
return
;;
[\-0-9.]) # Number can only contain digits, dots and a sign
current_varvalue="$current_varvalue$c"
;;
# Ignore everything else
esac
;;
"boolean") # Waiting for boolean to end
case "$c" in
[,\]}]) # Separator or array end or object end
output_entry "$current_path" "$current_varvalue"
preserve_current_char=1 # The caller needs to handle this char
return
;;
[a-zA-Z]) # No need to do some strict checking, we do not want to validate the incoming json data
current_varvalue="$current_varvalue$c"
;;
# Ignore everything else
esac
;;
esac
done
}
function parse_object() {
local current_path="${1:+$1.}$2"
local current_scope="root"
while [ "$chars_read" -lt "$INPUT_LENGTH" ]; do
[ "$preserve_current_char" == "0" ] && chars_read=$((chars_read+1)) && read -r -s -n 1 c
preserve_current_char=0
c=${c:-' '}
case "$current_scope" in
"root") # Waiting for new field or object end
[ "$c" == "}" ] && return
[ "$c" == "\"" ] && current_scope="varname" && current_varname="" && current_escaping=0
;;
"varname") # Reading the field name
case "$c" in
'"') # String end if not in escape mode, normal character otherwise
[ "$current_escaping" == "0" ] && current_scope="key_value_separator"
[ "$current_escaping" == "1" ] && current_varname="$current_varname$c"
;;
'\') # Escape character, entering or leaving escape mode
current_escaping=$((1-current_escaping))
current_varname="$current_varname$c"
;;
*) # Any other string character
current_escaping=0
current_varname="$current_varname$c"
;;
esac
;;
"key_value_separator") # Waiting for the key value separator (:)
[ "$c" == ":" ] && parse_value "$current_path" "$current_varname" && current_scope="field_separator"
;;
"field_separator") # Waiting for the field separator (,)
[ "$c" == ',' ] && current_scope="root"
[ "$c" == '}' ] && return
;;
esac
done
}
function parse() {
chars_read=0
preserve_current_char=0
while [ "$chars_read" -lt "$INPUT_LENGTH" ]; do
read -r -s -n 1 c
c=${c:-' '}
chars_read=$((chars_read+1))
# A valid JSON string consists of exactly one object
[ "$c" == "{" ] && parse_object "" "" && return
# ... or one array
[ "$c" == "[" ] && parse_array "" "" && return
done
}
if [ -z "$@" ]; then
INPUT=$(cat -)
else
INPUT=$(echo "$@")
fi
INPUT_LENGTH="${#INPUT}"
parse "" "" <<< "${INPUT}"

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