Used for poster presentation in HCI International 2014

1. 107 - Music Synchronizer with Runner's Pace for Supporting Steady Pace Jogging
Tetsuro Kitahara, Shunsuke Hokari, and Tatsuya Nagayasu (Nihon University, Japan)
Contact: Tetsuro Kitahara <e-mail: kitahara@chs.nihon-u.ac.jp, Twitter: @tetsurokitahara>
http://www.kthrlab.jp/
Core Time: 10:00-11:00 & 15:30-16:30 on every day
You can try our system! Let's try it!!
Our Goal: To allow everyone enjoy jogging
● Issue in jogging: To keep a steady pace
(In particular, to avoid a pace decrease due to tiredness)
→ Automatically alert the pace decrease
● Our idea: Auditory feedback of the pace decrease based on
synchronization of music playback speed with the pace
● Why music synchronization?
- No interference with vision
- Many people jog while listening to music
● Related works:
- Rubisch et al.(2010)
- Sakata et al.(2006)
Only proposal and prototype implementation (no experiments)
System Overview
START
Load waveforms with different
playback speeds
Choose a musical piece
Start music playback
Measure user's standard pace
Measure jogging pace
Switch waveform
Pace changed?
for 10 secs
After 5 sec passes...
Yes
No
Music is repeatedly played back
● Run on an Android device
● User wears the device on
his/her hip using a belt
How to measure pace
● Using the acceleration
sensor built in the device
● Acceleration value:
α(t) = |ax
(t) – ax
(t-1)|
+ |ay
(t) – ay
(t-1)|
+ |az
(t) – az
(t-1)|
is calculated every 80ms
● When α(t) > θ (threshold),
the step is counted
● # of steps for last 4 secs
is regarded as the pace
Every sec...
Preparation of waveforms
● Waveforms with speeds of
0.5, 0.6, …, 2.0 need to be
prepared in advance on PC
Experiment
Condition
● Participants: 10 people (8 male / 2 female, age: 22—23)
● Participants E & H often exercise, the others usually do not
Procedure
Jog
2 min
Jog Jog30s
2 min
30s
2 min
Jog
2 min
Jog Jog30s
2 min
30s
2 min
Rest
enoughWith normal playback With our system
Jog
2 min
Jog Jog30s
2 min
30s
2 min
Jog
2 min
Jog Jog30s
2 min
30s
2 min
Rest
enoughWith our system With normal playback
Results
Partic
ipant
With normal
playback
With our system
1st 2nd 3rd 1st 2nd 3rd
A 29.5 22.5 15.5 28.0 21.0 21.0
B 10.4 20.9 24.2 21.5 23.8 22.4
C 26.4 23.2 23.3 27.5 30.0 29.6
D 26.2 26.3 25.7 27.5 30.0 29.6
E 27.2 26.1 27.4 30.2 27.7 28.8
F 10.8 12.5 12.7 11.1 12.0 11.2
G 19.3 19.4 18.6 27.0 22.8 19.4
H 8.2 21.8 24.6 24.7 29.5 30.1
Average pace in each trial
Pace
down
Participants I & J: data loss
Steady
pace
or
Standard deviation of temporal pace variation
Partic
ipant
With normal
playback
With our system
1st 2nd 3rd 1st 2nd 3rd
A 0.5 10.5 3.5 2.0 2.0 3.0
B 2.8 5.3 3.6 4.0 3.9 3.0
C 4.3 4.3 4.2 4.0 3.6 3.4
D 3.5 3.7 3.5 3.4 3.7 3.4
E 5.1 4.1 4.2 5.1 3.9 5.0
F 1.6 3.7 2.3 2.0 2.3 1.8
G 3.9 4.1 3.1 4.1 3.5 3.3
H 2.1 4.0 4.9 3.8 5.1 4.6
Fairly
low
Steady
pace
Example of temporal pace variation
With normal playback With our system
Pace decreased at turning back
Please write your comments here!