IEEE Consumer Electronics Magazine - April 2017 - 116

Table 3. Sleep terminology categorization [5].
Terminology Category

Elemental Measure

Derived Measures

A

General terms describing the
temporal surround of a sleep
episode

*	 TATS
a) TATS start time
b) TATS end time
*	 TIB
a) TIB start time
b) TIB end time

*	 Total	TATS	duration
*	 Total	TIB	duration

B

General terms describing basic
features of wakefulness and sleep

*	
*	
*	
*	
*	

*	
*	
*	
*	
*	

Awake
Asleep
Awakening	from	sleep
Brief	awakening
Brief	moment	of	sleep	(dozing)

*	
*	
*	
*	
*	

TSPD
TST
Sleep	maintenance,	percent
Total	wakefulness	duration
Wakefulness	duration
after initial sleep onset
Number	of	awakenings
Number	of	brief	awakenings
Awakening	rate	per	hour
Sleep	fragmentation	rate
Number	of	dozing	episodes

C

Terms derived from basic features of
wakefulness, sleep as they relate to
the sleep episode and its surround

*	 Initial	sleep	onset	time
*	 Final	awakening	time

*	 Latency	to	sleep	onset
*	 Latency	to	arising
*	 Sleep	efficiency,	percent

D

Specific terms describing processes
occurring during sleep based on
polysomnography

*	
*	
*	
*	
*	

REM	sleep
N1
N2
N3
Central	nervous	system
(CNS) arousal

*	 Number	of	CNS	arousals
*	 CNS	arousal	rate	per	hour
*	 	Duration,	percentage	(of	TST),	
and latency from sleep onset for
each of the following:
*	 REM
*	 N1
*	 N2
*	 N3

E

Alternate terms for subdividing
sleep into different processes

*	
*	
*	
*	

Dream	sleep
Core	sleep
Sound	sleep
Restless	sleep

*	 D
	 uration	and	percentage	for	each	
of the following:
a) Dream sleep
b) Core sleep
c) Sound sleep
d) Restless sleep, percent of TST

F

Terms used to describe the sleep-
wake cycle over time periods
exceeding seven days

*	 Circadian	amplitude
*	 Circadian	period	length	(tau)
*	 Circadian	phase

*	 R
	 elative	duration	of	the	active	
period compared to the dormant
period

TATS: time when individual began attempting to sleep; TIB: time in bed; TSPD: total sleep period duration; TST: total sleep time; REM: random eye
movement; N1, N2, and N3 where N: non-REM sleep stage; CNS: central nervous system; d: day.

recording of walking, jogging, or running
based on the same device. Of significance is the checking between the video
record and the device measurement
count. The extent of uniform accuracy in
measurement is demonstrated by the
definition of a mean absolute percentage
error (MAPE) to measure how close an
estimate is to the true value:

estimate value (obtained from the step
count on the physical monitoring device
for each participant), and n is the number of estimate count of tests performed. A copy of CTA 2056 can be
obtained from the Consumer Technology Association (CTA) [6].

MAPE = (100/n) # / (Ti - E i) /Ti ,

The ATSC process for developing standards has three phases:
1) candidate standard
2) proposed standard
3) final ATSC standard.

where Ti is the true value (obtained
from the manual step count from the
video for each participant), E i is the
116 IEEE Consumer Electronics Magazine

^

APRIL 2017

ATSC 3.0 WIRELESS TV
EVERYWHERE

There is no single ATSC 3.0 standard. The 3.0 standard is actually a series
of standards with a single overview, or
parent, standard. The organization of all
the standards and their current status is
indicated in Figure 1.
The parts that are in the public domain can be accessed at www.atsc.org,
under the Standards tab. As of this writing, there is only one finalized 3.0 standard, A/321. If one looks under the
Standards/Candidate Standard tab, one
will find many so-called candidate
standards. All of the current candidate
standards under that tab are part of the
http://www.atsc.org
Table of Contents for the Digital Edition of IEEE Consumer Electronics Magazine - April 2017
