Gedae Advanced Course End Of Segment Processing

1
Gedae Advanced CourseEnd Of Segment Processing

• Kerry Barnes
• [phone]
• gedae_at_gedae.com

2
EndOfSegment Method

• The segsum primitive
• Sums segment data
• Produces sum at EOS
• The segcnt primitive
• counts samples in segment
• produces count at EOS

• EndOfSegment method is called once at EOS
• Allows primitive to do special processing for EOS
• Primitive can produce data samples at EOS

3
The segsum Primitive

• Interpolate rate is 0 so no space is required on
  output queue during Apply
• Constant requirement is 1 so 1 token is reserved
  for EndOfSegment
• Apply method sums input but produces nothing
• EndOfSegment copies sum to output and produces 1
  token

• Name segsum
• Type static
• Input stream float in
• Local float sum
• Outputdynamic float out(0,1)
• Reset
• sum 0
• Apply
• int i
• for (i0 iltgranularity i)
• sum ini
• EndOfSegment
• out sum
• produce(out,1)

4
Summary Segment Results

• Scope3 displays
• Segment energy
• Segment length
• Average power per sample

5
Example 1 Trace Table

• EndOfSegment methods called at end of segment
  processing

• Reset methods called at beginning of segment
  processing

6
Example 1 Trace Table

• EndOfSegment methods called at end of segment
  processing
• Segment boundaries automatically added
• EOS occurs after all segment tokens produced by
  source are consumed

Data produced by EOS methods
7
Exercise 1
8
Exercise 2

• Replace circled boxes with a single box that
  calculates the average value of the segment

9
Exercise 1 Completed
Name subK Type static Input stream float
in nondet stream float K Output
stream float out Include include
lte_vsadd.hgt Apply amount(K,1) if
(queues_ready) e_vsadd(in,1,-K,out,1,gran
ularity)
10
Exercise 1 Trace Table

• Trace table with scope removed
• Schedule 2 does initial segment processing
• Schedule 4 calculates average dc value from
  end-of-segment result s of schedule2
• Schedule 3 waits for average dc value from
  Schedule 4 before it can do final segment
  processing

11
Exercise 2 CompletedInformational and Data Fields

• Name segave
• Type static
• Input
• stream float in
• Local
• float sum
• int cnt
• Output
• dynamic stream float out(0,1)

12
Exercise 2 CompletedMethods

• Reset
• sum 0
• cnt 0
• Apply
• int i
• for (i0 iltgranularity i)
• sumini
• cnt granularity
• EndOfSegment
• out sum/cnt
• produce(out,1)