Presentation 2 Technical Aspect of ISDB-T system and Hardware Feb. - - PowerPoint PPT Presentation

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Presentation 2

Technical Aspect of ISDB-T system and Hardware

• Feb. 12, 2003 TVRI seminar in Jakarta

Yasuo Takahashi Director of DiBEG Seminar working Group (Toshiba) Ｄ ｉ Ｂ Ｅ Ｇ

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Contents

• What’s ISDB-T?
• ISDB-T is , -Requirements/Solutions, -ISDB family, -Technical solutions,
• Parameters of ISDB-T system
• Why ISDB-T now?
• comparison of 3 DTTV systems, -Results of comparison test in Brazil, -

DTTV selection guide, -Conclusion

• How ISDB-T developed?
• Pilot test in Japan, -Development of mobile receiving technology, -Proto

type of Digital Audio/one segment receiver

• ISDB-T now in Japan (Commercial type receiver)

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What’s ISDB-T ?

• ISDB-T is
• Requirements/Solutions
• ISDB family
• Technical solutions
• Parameters of ISDB-T system

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ISDB-T is ・ ・ ・ ・

• ISDB-T system was developed by the Association
• f Radio Industries and Businesses (ARIB) in

Japan.

• ISDB (Integrated Digital Services Digital

Broadcasting) is a new type of broadcasting intended to provide audio, video, and multimedia

• services. T is Terrestrial.
• ISDB-T is one of ISDB family.
• ISDB-T uses a modulation method referred to as

Band Segmented Transmission (BST) OFDM

ISDB-T Demo

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Market Requirements for ISDB-T

• HDTV

and Multi SDTV

• Multimedia Service
• Mobility and Portability
• Flexible/Versatile
• Data Broadcasting
• Effective Spectrum Utilization
• Commonality of Receiver

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M u l t i m e d i a

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e r v i c e H i g h

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u a l i t y , M u l t i

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h a n n e l s F l e x i b l e / V e r s a t i l e M

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Transmission Layer Optimized for each transmission system ↓ Satellite/Terrestrial/Cable Application Layer

Commonality

Interoperability ↓ MPEG-2 Standard Data Audio Video Encode Encode Encode Multiplex FEC/Interleaving Modulation

MPEG-2 MPEG-2

Layered Structure for Digital Broadcasting

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ISDB Family

MPEG-2 TS Satellite(ISDB-S) Cable(ISDB-S) Terrestrial(ISDB-T) Package, communication and Other media (DVB and ATSC) Multiplexing Video Audio Data Coding Coding Coding MPEG-2 Error correction RS(204,188) Error correction RS(204,188) Error correction RS(204,188) + Conv. code Modulation TC-8PSK Modulation 64QM Modulation Segmented OFDM

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layer of DTTV -ISDB-T

• OFDM

– Robustness, SFN (Single Frequency Network)

• Segmented Structure

– Extensible, Partial Reception

• Time Interleaving

– Mobile Reception, Indoor Reception

• TMCC ( Transmission and Multiplexing Configuration

Control )

– Flexible, Versatile

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Transmission Scheme

• Band Segmented Transmission OFDM
• Bandwidth of an OFDM-Segment:
• 6/14MHz (428.6kHz) or 8/14MHz

(571.4kHz)

• Number of OFDM Segments: 13

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Partial Reception

6MHz or 8MHz

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Transmission Scheme

• Band Segmented Transmission OFDM
• Bandwidth of an OFDM-Segment:
• 6/14MHz (428.6kHz) or 8/14MHz

(571.4kHz)

• Number of OFDM Segments: 13
• Partial Reception

– One-segment ISDB-T receiver can receive a centered segment of ISDB-T signal.

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Partial Reception

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Transmission Scheme

• Band Segmented Transmission OFDM
• Bandwidth of an OFDM-Segment:
• 6/14MHz (428.6kHz) or 8/14MHz (571.4kHz)
• Number of OFDM Segments: 13
• Partial Reception

– One-segment ISDB-T receiver can receive a centered segment of ISDB-T signal.

• Hierarchical Transmission

– Three layers – Modulation, Coding rates, Length of Time interleaving

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Segmented Structure and Partial Reception

Sound / Data HDTV

Layer A Layer B

An Example of Hierarchical Multiplexing

Parameter 64QAM 3/4 12 segments 16QAM 1/2 1 segment Bit rate 16.9 Mbps 630 kbps

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Three Mode of ISDB-T

64QAM 16QAM QPSK DQPSK

Mode3(8K) Mode2(4K) Mode1(2K) Mobile SDTV Fixed HDTV/SDTV Mobile & Fixed HDTV/SDTV

TMCC can change the mode any time to any combination.

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Parameters of ISDB-T

(6MHz Bandwidth)

up to Three Layers Hierarchical Transmission Convolutional Code (1/2, 2/3, 3/4, 5/6, 7/8) Inner Coding RS(204, 188) Outer Coding 5617 2809 1405 Total Carriers 0, 0.125, 0.25, 0.5sec Time Interleaving 1/4 , 1/8 , 1/16 , 1/32 of Active Symbol Duration Guard Interval Duration 204

• No. of Symbols per Frame

1,008μsec 504μsec 252μsec Active Symbol Duration DQPSK, QPSK, 16QAM, 64QAM Modulation 0.992kHz 1.984kHz 3.968kHz Carrier Spacing 3.65Mbps ～ 23.23Mbps Useful Bit Rate 5.572MHz 5.573MHz 5.575MHz Useful Bandwidth 13

• No. of OFDM Segment

Mode 3 Mode 2 Mode 1 ISDB-T Mode

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Parameters of ISDB-T

(8MHz Bandwidth)

up to Three Layers Hierarchical Transmission Convolutional Code (1/2, 2/3, 3/4, 5/6, 7/8) Inner Coding RS(204, 188) Outer Coding 5617 2809 1405 Total Carriers 0, 0.125, 0.25, 0.5sec Time Interleaving 1/4 , 1/8 , 1/16 , 1/32 of Active Symbol Duration Guard Interval Duration 204

• No. of Symbols per Frame

756μsec 378μsec 189μsec Active Symbol Duration DQPSK, QPSK, 16QAM, 64QAM Modulation 1.322kHz 2.645kHz 5.291kHz Carrier Spacing 4.87Mbps ～ 30.98Mbps Useful Bit Rate 7.430MHz 7.431MHz 7.434MHz Useful Bandwidth 13

• No. of OFDM Segment

Mode 3 Mode 2 Mode 1 ISDB-T Mode

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pDTTV System Selection Guideline

ISDB-T

Resistivity against impulse noise Mobility and Portability

ISDB-T >> DVB-T ISDB-T>> DVB-T

Hierarchical transmission (Multiple modulation systems simultaneously in the same channel is possible)

DVB-T, ISDB-T

Resistivity against multi-path distortion

DVB-T, ISDB-T

Wide area single frequency network (SFN)

• peration

ISDB-T

System commonality with digital terrestrial sound broadcasting (One segment receiver is available)

ATSC

Maximum bit rate under Gaussian noise environment System conform to requirements Requirements Any improvement of digital receiver was not considered to make the table below.

Brazilian Test Results

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• comparison of 3 DTTV systems
• Results of comparison test in Brazil
• DTTV selection guide
• Conclusion

Why ISDB-T now?

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Broadcasting Services

◎ ◎ × SFN ◎ △ × Internet access ◎ △ × Portable reception with cellular phone ◎ × (○ SDTV) × HDTV Mobile reception ◎ ◎ ◎ Data broadcasting ◎ ◎ ◎ HDTV/ SDTV Fixed reception ATSC ISDB-T DVB-T System Item

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ISDB-T TV SET

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Technical Detail of DTTV Systems - 1

Execution engine Presentation engine

ARIB B 23 DVB MHP ACAP 1/Dec/2003 Sep/1998 1/Nov/1998 Launch (204,188) Reed-Solomon code BML (XHTML), ECMAScript (DVB HTML) CSS / DVB CA Multi 2 / ARIB B 25 MPEG-2 AAC MPEG-2 BC Conv.code(1/2-7/8) 2/3Trellis Code Inner Outer (207,187) Reed-Solomon code Error correction DES / NRSS Conditional access MPEG-2 Systems (ISO/IEC 13818-1) Multiplex Dolby AC-3 Audio coding Dase-1 Data broadcasting MPEG-2 Video(ISO/IEC 13818-2) Video coding ISDB-T DVB-T ATSC System

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Technical Details of DTTV Systems - 2

3.65 -23.2 Mbps 3.69 -23.5Mbps 19.39 Mbps Information bit rate time Frequency Bit/Symbol Yes

• TMCC

6/7/8 MHz 6/7/8 MHz 6/7/8 MHz Channel bandwidth 1/2, 1/4, 1/8,1/16,1/32 1/4,1/8,1/16,1/32 11.5% Excess Bandwidth/ Guard Interval 0.1s,0.2s,0.4s,0.8s

• Yes

Yes Yes Inter- leaving Yes Yes

• Segmented COFDM

(DQPSK,QPSK, 16QAM,64QAM) COFDM (QPSK, 16QAM,64QAM) 8VSB Modulation ISDB-T DVB-T ATSC System

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• As the experimental result, time interleaving improve required

CN ratio about 7 dB in mobile environment on 16QAM.

• Diversity system improve about 7dB on 16QAM.
• Time interleaving (time diversity) work independently from

space diversity.

• That is the reason for advantage of ISDB-T in mobile

environment.

• Time interleaving improve robustness against impulse noise

interference that come from power line and motor cycle engine.

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DTV Trials in the World

• Singapore, mda

– 1999

– The Panel concluded that the DVB and ISDB-T systems will work for this application.(5. Mobile TV, p.4) – ISDB commercial applications is not available... (in 1999)

• Hong Kong, OFTA,ATV,TVB

– 1999

– Mobile reception of ISDB-T and DVB-T was good in open areas.(5. Support of Mobile reception, p.4) – Report on the technical trial of digital terrestrial television(DTT) Digital Terrestrial Television Steering Committee (executive summary)

• Brazil, ABERT/SET, ANATEL

– 1999/2000

– If you look into our test report, the best performance, by far, is the ISDB- T COFDM proposal. The biggest problem is the fact that Japan is schedule to start the terrestrial transmission only in 2003. – Why we are choosing COFDM for Brasil, HDTV news Sunday April 9 2000(Fernando Bittencourt :Chairman ABERT/SET group)

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Result of comparison test conduced by ABERT/SET of Brazil

Original published by ABERT/SET in Portuguese. Translated and revised by NHK

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Laboratory Tests Basic Configurations

ATSC DVB-2K* DVB-8K**ISDB-4K*** PAYLOAD (Mbps) 19.39 19.75 18.09 19.33 Configurations 1 Lots Many * 2K, FEC ¾, GI 1/16 (18,67us) ** 8K, FEC 2/3, GI 1/32 (37,33us) *** 4K, FEC ¾, GI 1/16 (31,5us), 0,1s Time Interleaving

Original published by ABERT/SET in Portuguese. Translated and revised by NHK

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Laboratory Tests - Results

Multi-path

DVB 8K Best Result OFDM results are function of FEC and Receiver

implementation

Carrier to noise ratio as a function of the carrier to echo ratio

Com parison for post-echo = 8us

14 17 20 23 26 29 32 35 1 2 3 4 5 6 7 8 9 10 11 12

C/E (dB) C/N (dB)

ATSC DVB - 3/4 1/16 2K DVB - 2/3 1/32 8K ISDB - 3/4 1/16 4k 0,1s

Original published by ABERT/SET in Portuguese. Translated and revised by NHK

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Laboratory Tests - Results

Impulse Noise

ISDB – Best Results (Time Interleaving) DVB 8K Better than DVB 2K (5dB)

Interference to carrier ratio as a function of the noise pulse width

• 10

10 20 30 100 200 300 400

Pulse width (us) "I"/C (dB)

ATSC DVB - 3/4 1/16 2K DVB - 2/3 1/32 8K ISDB - 3/4 1/16 4K 0,1s Original published by ABERT/SET in Portuguese. Translated and revised by NHK

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Laboratory Tests - Results

Mobile Reception Simulation ATSC did not work at 1.8 Km/h Number of carriers is a key factor ISDB 4K has similar performance to the DVB 2K DVB 8K only portable Rx.

Mobile Reception

100 200 300 400 500 600 700 800 4 6 8 10 12 14 16 18 20 22 24 Bit rate (Mbps) Speed (Km/h) DVB 2K DVB 8K ISDB 2K ISDB 4K ISDB 8K

Mobile Reception

100 200 300 400 500 600 700 800 4 6 8 10 12 14 16 18 20 22 24 Bit rate (Mbps) Speed (Km/h) DVB 2K DVB 8K ISDB 2K ISDB 4K ISDB 8K

Original published by ABERT/SET in Portuguese. Translated and revised by NHK

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Field Test – Results Coverage

DVB 8k similar to ISDB 4k ATSC similar to DVB 2k (inadequate) ISDB 4k Higher Payload (+1.2 Mbps) Successful Reception Percentage -

Cumulative function - Criteria: Margin - F(50,90) >0 and Errors< 5

60% 70% 80% 90% 100% 10 20 30 40

Distance (km) Sites Percentage

ATSC DVB - 2k DVB - 8k ISDB - 4k

Original published by ABERT/SET in Portuguese. Translated and revised by NHK

UK used DVB-2K at first (Added by NHK)

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DTTV System Selection Guideline - 1

ISDB-T Robustness against impulse noise DVB-T, ISDB-T Robustness against multi-path distortion DVB-T, ISDB-T Wide area single frequency network (SFN) operation ATSC Maximum bit rate under Gaussian noise environment System conform to requirements Requirements

Any improvement of digital receiver was not considered to make the table below.

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DTTV System Selection Guideline - 2

Mobility and Portability ISDB-T >> DVB-T ISDB-T>> DVB-T Hierarchical transmission (Multiple modulation systems simultaneously in the same channel is possible) ISDB-T System commonality with digital terrestrial sound broadcasting (One segment receiver is available) System conform to requirements Requirements

Any improvement of digital receiver was not considered to make the table below.

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ISDB-T has launched in Tokyo, Osaka and Nagoya

areas. And ISDB-Tsb has already launched.

ISDB-T can receive in Mobile/Portable environment. ISDB-T brings robustness to multi-path interference

in fixed reception.

ISDB-T provides effective utilization of Frequency

with SFN.

ISDB-T is the most flexible system among the DTTV

standards.

Conclusions

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What’s merit of ISDB-T for DTTV system ?

• Service flexibility and Inter-operability
• Merit of transmission characteristics

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HDTV Stationary reception

Diagram of Requirements

Bit rate Low Strong Weak

Mobile reception 6MHz bandwidth

Wide Narrow High B a n d w i d t h Error protection

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ISDB-T Mobile Reception

and Flexibility of services

N

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e ; I n c a s e

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m

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i l e r e c e p t i

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, s e r v i c e a r e a i s r e d u c e d .

64QAM

Mobile (Data,Music,et c....)

Ｈ

DTV TV Program 3 (SDTV) TV Program 2 (SDTV) TV Program 1 (SDTV) Mobile(Data,Music,e tc....) Mobile (Data,Music,et c...) 64QAM 64QAM 16QAM

＜Pocket-size small receiver＞

DQPSK DQPSK DQPSK

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How ISDB-T developed?

• Pilot test in Japan
• Development of mobile receiving

technology

• Proto type of Digital Audio/one

segment receiver

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Experiment Broadcast test in Japan

Experiment Broadcast test has been held in 11 area, The purposes of this test are (1)transmission characteristics investigation, (2)Mobile & portable reception capability, (3)Evaluation of digital system, (3)Investigation for digital broadcast new service,etc I will introduce the several examples of pilot test image in this seminar.

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Experimental Broadcasting in Japan

for new business promoting Hokkaido

Tohoku-District

Shinetu Hokuriku Tokai

Kinki-District Chugoku-District Kyushu-District

Okinawa

Shikoku-District

Other 10 Area started April ‘99 Other 10 Area started April ‘99

• Open to public for business

developing and research

Tokyo area started Oct. ‘98 Tokyo area started Oct. ‘98

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Experimental Broadcasting in Japan

for System finalization of ISDB-T

Kanto Area Kanto Area Tokyo

Tokyo Tower Height 210m CH UHF-15 Power 500W Sawara Stn.

SFN

Existing Analog TV Ch-14 50kW Ch-16 10kW

Transmitting started since Oct.’98

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LIN CORR UP -CON

RF AMP

OPF

DUMMY

• COAX. SW

DIST

DELAY OPT TX OPT RX OPT TX OPT RX

TV TX

• COAX. EQUIP

F E C ENC OFDM MOD TMCC V

SDTV 480i ENC SDTV 480i ENC SDTV480p ENC SDTV480i ENC Audio ENC SDTV480p ENC HDTV1080i ENC

A V A A A V V V A A

M U X

MPEG -2 ENC

TRANSMISSON EQUIP RELAY TRANSMISSON EQUIP

DOWN CON OFDM DEMO FEC DEC TS DIST SDTV DEC HDTV DEC HDTV MON V A V A BPF

RECEIVER

500W UHF 15CH IF

Block Diagram of Tokyo Pilot Project

TMCC:Transmission and Multiplexing Configuration Control Caption

Sending Equip. EPG&Data Sending Equip.

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Mobile Reception

Ｄ ｉ ｇ ｉ ｔ ａ ｌ Ａ ｎ ａ ｌ ｏ ｇ

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The fluctuation situation on electric field strength by mobile reception The fluctuation situation on electric field strength by mobile reception

Example of fluctuation （bandwidth:6MHz） Example of fluctuation（bandwidth:1.5MHz）

Example of fluctuation（bandwidth:300kHz）

Example of fluctuation (NTSC Audio carrier)

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720P Transmission Experiment Situation of Demonstration

４ ８ ０ ｐand ７ ２ ０ ｐDEC ７ ２ ０ P and ４ ８ ０ P simultaneous broadcasting

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SDTV ３ channels transmission

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The drama which a story can choose by liking The drama which a story can choose by liking

HD channel

(common story)

a man meets three ladies. SD:A ch. Kyoko’s story SD:B ch. Yuka’s story SD:C ch. Emi’s story HD channel

(common story)

A hero worries about marriage partner selection SD:A ch. married life with Kyoko SD:B ch. married life with Yuka SD:C ch. married life with Emi Selection point 1 A partner is chosen Selection point 2 A marriage partner is chosen

The outline of story deployment of a drama Outline

• A channel is controlled by VC (visual code) inserted into the program.
• VC of zapping prohibition is inserted in SD channel so that it cannot move

to other channels.

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Th The receiving sc e receiving screen o reen of hir hirerarchial transmis rarchial transmission sion

M i d d l e c l a s s r e c e i v i n g

U p p e r c l a s s r e c e i v i n g L

• w

e r c l a s s r e c e i v i n g

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S c h e m a t i c B a c k c h a n n e l R e c e i v e ( V i e w e r )

R e c e i v i n g e q u i p m e n t

D

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a M

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u l e T V

S e r v e r

I n t e r n e t

i M

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e

C

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p

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双方向データ

B r

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d c a s t

Program On AIR F

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T e r m i n a l D a t a s e r v e r

D

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a

C

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t e n t s I n t e r a c t i v e d a t a

T e r m i n a l

Schematic of interactive service for mobile reception Schematic of interactive service for mobile reception

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Mobile Reception of ISDB-T

• n train
• Indoor test result
• Mode3,QPSK,FEC=1/2,GI=1/4
• Max Speed=494km/h
• Field test result
• Tohoku Shin kansen bullet train

– (Miyagi prefecture Sendai city)

• Constant speed

275km/h

• Mode2,

FEC=1/2,GI=1/4,T.I=0.43ms,SFN

• Percentage of success on receiving

(without tunnel area)

• QSPK 90.3 %
• 16QAM

74.5 %

NHK

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Mobile Reception of HDTV

– DVD Video

NHK

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Result of Indoor Test on ISDB-T Diversity Reception System

• 86 dBm
• 84 dBm
• 81 dBm
• 66 dBm

Desired input level (@ fdmax =20Hz)

63 km/h 95 km/h 45Hz 3 49 km/h 74 km/h 35Hz 2 63 km/h 95 km/h 45Hz 4 28 km/h 42 km/h 20Hz 1

Velocity@62ch ( v = fdmax × l ) Velocity@19ch ( v = fdmax × l )

fdmax

Number of Branch Desired input level[dBm] Maximum Doppler Frequency fdmax[Hz] 10 20 30 40 50 60

• 100
• 90
• 80
• 70
• 60
• 50

1 2 3 4 Number of used branches Mode3 GI=1/8 64QAM 3/4 I=2 18.255 Mbps GSM Typical urban area model

20dB improved 35km/h improved

NHK

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40 45 50 55 60 65 70 75 80 20 40 60 80 100

Mode3 GI=1/8 64QAM 3/4 I=2 Number of used branches 1 2 3 4

Electric field strength[dBuV/m]

Percentage of success

• n receiving[%]

Result of Field Experiment

UHF 19 ch

NHK

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Effect of Time Interleaving

• As the experimental result, time interleaving improve required

CN ratio about 7 dB in mobile environment on 16QAM.

• Diversity system improve about 7dB on 16QAM.
• Time interleaving (time diversity) work independently from

space diversity.

• That is the reason for advantage of ISDB-T in mobile

environment.

• Time interleaving improve robustness against impulse noise

interference that come from power line and motor cycle engine.

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Toyota Central Lab demonstrated HDTV Mobile Reception using Adaptive Array Antenna

UHF 15ch (whole segment reception) Mode 3, 64QAM, 3/4 Guard interval: 1/8(128μs)

Pole type antenna Adaptive Array Antenna (conventional) attached on wind shield

Reception rate

Pole type antenna Adaptive Array Antenna

Adaptive Array Antenna

Jan 29,2003

Reference: http://ne.nikkeibp.co.jp/DTV/2003/01/1000016922.html

Threshold C/ N= 20.1dB

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Prototype digital radio receiver (ISDB-Tsb)

Presented by DRP

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ISDB-T one segment Front-end module and Antenna

• Panasonic announced ISDB-

T one-segment front-end module for cellular phone and PDA.

• RF tuner circuit and OFDM

demodulator are installed in this module.

• Specifications;

– Size; 20mm×28mm×2mm – VHF 7ch, UHF13～53ch – Length of the antenna; 50mm – Power Consumption; 200mW – Modulation; DQPSK and QPSK and 16QAM

Antenna Element Antenna Control Module ISDB-T One segment Front End Module

July 17 2003

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One Segment Service of ISBD-T for Cellular Phone

Sanyo NEC KDDI & NHK

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ISDB-T now in Japan (Commercial type receiver)

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Block Diagram of ISDB Block Diagram of ISDB-

• S and ISDB

S and ISDB-

• T

T

B S A n t e n n a Ｎ Ｔ Ｓ Ｃ V i d e

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u t p u t C A S c a r d I / f T S A n a l

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A u d i

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u t p u t Ｙ P

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P

Ｒ

V i d e

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u t p u t S y s t e m L S I Ｉ Ｅ Ｅ Ｅ 1 3 9 4 I / f V i d e

• /

A u d i

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e c

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e Ｌ Ｓ Ｉ Ｂ Ｓ T u n e r F

• n

t R O M R A M F l a s h M e m

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y O p t i c a l D i g i t a l A u d i

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u t p u t T e l c

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C h a n n e l D e c

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e Ｌ Ｓ Ｉ ( ８ Ｐ Ｓ Ｋ ) . Y a g i

• A

n t e n n a ( C h a n n e l D e c

• d

e Ｌ Ｓ Ｉ O F D M ) Ｕ Ｈ Ｆ T u n e r Ｎ Ｔ Ｓ Ｃ V i d e

• O

u t p u t C A S c a r d I / f A n a l

• g

A u d i

• O

u t p u t Ｙ P

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P

Ｒ

V i d e

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u t p u t S y s t e m L S I Ｉ Ｅ Ｅ Ｅ 1 3 9 4 I / f V i d e

• /

A u d i

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e c

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e Ｌ Ｓ Ｉ F

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t R O M R A M F l a s h M e m

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y O p t i c a l D i g i t a l A u d i

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u t p u t T e l c

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ISDB - Satellite ISDB - Terrestrial

T S

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Video Dec. 2D-Graphic Format Conv. Transport Dec. LSI TS IEEE1394 I/F Front-end LSI Digital Tuner RDRAM SDRAM

Core Software PiE- OS Operating System for DTV

MN88415(June’9 9) MN2WS0002B H (June’00) MN6775 4 (June’00 ) MN864602(Jun’01) News Release (April’00) News Release (May’00) BS-Tuner QF20(July’00)

Key Technology for DTV Systems Key Technology for DTV Systems

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• ISDB-T tuner are

installed in 37”, 42”, 50”PDP TV and 32”, 26”, 22” LCD TV.

Panasonic Announced the Sale of New PDP and LCD TV Sets

Aug 21

PDP TV 37 42 50 LCD TV

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• New models

– PDP 61”, 50”, 42” 9models – LCD 42”, 37”, 32” 3models – CRT 28”, 32”, 28” 3models

Sony Announced the Sale of New Digital TV Sets

Aug 28

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Thank you for your attention !

END