ARD9900ARD9900Fast Radio ModemFast Radio Modem

　　Digital Ready on Digital Ready on HF !HF !

　　11．．DigitalDigital　　VoiceVoice　　

2. Digital Picture 2. Digital Picture

3. Digital Data3. Digital DataAnalog Radio

ConventionalConventional

No Modification!No Modification!

ARD9900ARD9900　　Front ViewFront View

ARD9900ARD9900　　Rear ViewRear View

ARD9900ARD9900　　Video MemoryVideo Memory

OFDM ModemOFDM Modem

　　　　　　　　　　　　　　　　　　　　SpectrumSpectrum

OFDMOFDM WaveFormWaveForm

Digital VoiceDigital Voice

�� Totally Totally Encrypted (2Encrypted (2Encrypted (2Encrypted (2Encrypted (2Encrypted (2Encrypted (2Encrypted (271 71 71 71 71 71 71 71 code based keycode based keycode based keycode based keycode based keycode based keycode based keycode based key))))))))

�� Amazing Voice Quality (Amazing Voice Quality (AMBEAMBEAMBEAMBEAMBEAMBEAMBEAMBE2020)2020)

�� Easy interfaceEasy interface with TX/RX (MIC/SP)with TX/RX (MIC/SP)

�� Keep Keep High qualityHigh quality in Heavy Fading channelin Heavy Fading channel

�� Wide range Wide range AFCAFC for for SSBSSB OperationOperation

�� Easy Easy cross operationcross operation Analog Analog -- DigitalDigital

�� AutoAuto Detection of Digital VoiceDetection of Digital Voice

EncryptionEncryption

User Defined MasterKeyMasterKey 12digits

AlgorithmAlgorithmID 7bits

AirKeyAirKey 16bits

EncryptionEncryption

AlgorithmAlgorithm

ProcessorProcessor

Encryption Code

Tabble GEN.

Digital Code SquelchDigital Code Squelch

User IDUser ID 5digits

ID MaskID Mask 5digits

HierarchicalHierarchical

SquelchSquelch

ProcessorProcessor

Voice ProcessVoice Process

MIC

ADC Vocoder

AMBE

OFDM

ModulatorDAC

ADCOFDM

Demodulator

Vocoder

AMBEDAC

SP

( ( ( ( T X )T X )T X )T X )

( R X )

EncryptionEncryption

DeDe--

EncryptionEncryption

AMBE2020 AMBE2020 VocoderVocoder

8KHz Sampling Voice

　　　2400bps

+

1200bps FEC

Digital Digital

PicturePicture

�� Totally Totally EncryptedEncrypted

�� Video CaptureVideo Capture from the NTSC videofrom the NTSC video

�� NTSCNTSC video video OutputOutput for the Monitorfor the Monitor

�� Powerful Error control (Powerful Error control (FECFEC) )

(Convolution coding + Reed(Convolution coding + Reed--Solomon)Solomon)

�� Flexible Flexible PC interfacePC interface(Up/Down load etc)(Up/Down load etc)

�� 368x240368x240 pels pels Modified JPEG compressionModified JPEG compression

�� AutoAuto Detection of Digital PictureDetection of Digital Picture

Digital Video ProcessDigital Video Process

CameraNTSC

Decoder

Frame

Memory

Compre-

ssion

FEC

Coding

OFDM

Mod.

OFDM

Demod.

Error

Correction

Expan-

sion

Frame

Memory

NTSC

Encoder

Monitor

FEC:Convolution Coding +

Reed-solomon

( T X )

( R X )

Convolution CodingConvolution Coding

IN

I OUT

Q OUT

+

+

Decoding :ViterbiViterbi

ReedReed--Solomon CodingSolomon Coding

(44,36)(44,36)(44,36)(44,36)

G(x)=x8+α176x7+α240x6+α211x5+α253x4

+α220x3+α3x2+α203x+α36

Generator Poly

GF(28)

Digital DataDigital Data

�� Totally Totally EncryptedEncrypted

�� Transmission of Transmission of ASCII or BinaryASCII or Binary packet packet

�� 2Kbyte2Kbyte maximum maximum packetpacket sizesize

�� FECFEC::VitabiVitabi and and ReedReed--solomonsolomon

�� 1,472bps1,472bps throughthrough--put on HF channelput on HF channel

�� AutoAuto Detection Data modeDetection Data mode

Data ProcessData Process

PC

BufferFEC

Coding

OFDM

Mod.

OFDM

Demod.

Error

CorrectionBuffer

ASCII or Binary FEC:Convolution Coding +

Reed-Solomon

( T X )

( R X )PC

MODEM ParametersMODEM Parameters

�� 36 36 carriers DQPSK (Spacing 62.5Hz)carriers DQPSK (Spacing 62.5Hz)

�� 280Hz280Hz　　～　～　25302530HzHz

�� 50baud/3,600bps50baud/3,600bps

�� AFC AFC ±±125125HzHz

�� 1sec 3 tones Header , 20msec OFDM frame1sec 3 tones Header , 20msec OFDM frame

�� 4msec Guard Interval4msec Guard Interval