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HD RA

TECHNOL

ASJAD

NI

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INTRODUCTION

It is a multicasting program channels and operating modes.

HD Radio is the technology used by AM and FM rad

stations to transmit audio and data by using a digital sig

embedded on-frequency immediately above and belowstation's standard analog signal, providing the means to list

to the same program in either HD (digital radio with le

noise) or as a standard broadcast (analog radio with standa

sound quality)

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The HD format also provides the means for a single radstation to simultaneously broadcast one or more differe

programs in addition to the program being transmitted

the radio station's analog channel.

It was selected by the United States Fede

Communications Commission (FCC) in 2002 as a digital aud

broadcasting method for the United States, and is the on

digital system approved by the FCC for digital AM/F

broadcasts in the United States.

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HOW DOES IT WORK?

Broadcaster analog a

digital audio as well

digital data information.

Audio and data informati

is sent from the studio

the transmitter site.

Digital and analog sign

are transmitt

simultaneously.

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Signal travel throughout the broadcast area.

Digitally compressed for, multicasting and enhance

services.

Same as regular radio, except a bundled signal (digital ananalog).

HD radio equipped receivers now experience free, cryst

clear digital audio and additional FM content.

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THE HD RADIO SYSTEM

Once Main Program Service(MPS) was established, broadcasters becamintrigued with HD Radio's ability to deliver multiple, independent, prog

streams, over the same digital signal as Supplemental Program Service

which is now commonly referred to as multicast.

Its transmitters signal using these functions

Importer

Exgine

Exporter

Synchronizer

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IMPORTER

The importer contains the hardware and software necessa

to deliver Advanced Application Services (AAS).

The importer establishes session connections betwe

multiple service providers. Once a session is establisheservice providers can pass service data over the importer-t

exporter link (I2E),we will be broadcast over the air to

Radio digital receivers.

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EXGINE

The exgine subsystem accepts the exporter-to-exgine l

(E2X) data from the exciter's host processor and performs t

Orthogonal Frequency Division Multiplexing (OFD

modulation for the digital portion of the HD Radio waveform

The HD Radio data stream is fed to the exgine over a simp

UDP Ethernet connection.

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EXPORTER

The Exporter accepting the MPS AES audio, PSD, multiplexSPS audio, and advanced application service data from t

importer.

An exporter is essentially a Gen II exciter without the RFU a

DUC sub-assemblies.

The exporter accepts digital MPS audio over its aud

interface, bit reduces (i.e. compresses) the audio and outp

the bit-reduced audio to the exgine over the simplex E2X.

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SYNCHRONIZER

The synchronizer accepts MPS audio and rate converts it

system clock.

The synchronizer provides the master system clock used by t

This master clock is also synchronized to the exciter's clock

GPS unit. The synchronizer derives the master clock from an

unit's 10MHz output signal.

The synchronizer is also used to bypass (or redirect) the ana

from being passed through the exporter in the event th

removed for maintenance.

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SIGNAL TRANSMITTING AND

RECEIVING

Digital information

is transmitted using

COFDM with an

audio compression

algorithm called

PAC (Perceptualaudio coder).

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AM

SIGNALS

AM HD Station locking

AM channel sending d

approximately 20k

through two 33Kbit/s ana

telephone lines.

The HD Radio AM hyb

mode offers two optio

which can ca

approximately 40 or

Kbit/s of data, but most A

digital stations default to t

more-robust 40 Kbit/s mo

which features redunda

(same signal broadc

twice).

http://en.wikipedia.org/wiki/File:KNX_HDlock.jpg

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The pure digital mode transmissions will stay within the AM station

channel instead of spilling into the channels next to the stati

transmitting "HD radio" as the hybrid digital stations do.

AM radio stations are spaced at 9 kHz (Europe) or 10 kHz (America

intervals, much of the digital information overlaps adjacent channe

when in hybrid mode.

The digital radio signal received on a conventional AM receiver tun

to an adjacent channel sounds like a large waterfall or similar wh

noise-like hiss, as can be heard in the audio sound clip referenced

the previous sentence.

AM is used DRM system, Digital Radio Mondiale (DRM) is a syste

designed primarily for world band radio and AM Radio. DRM is ve

similar to AM HD Radio in that each station is broadcast via a chann

20 kilohertz wide (+/-10 kHz).

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FM

SIGNALS

Spectrum of FM broadcast stationwithout HD Radio

FM provides a "fallba

condition where it reverts t

more-robust 25 Kbit/s signal.

FM stations have the option

subdivide their Data Stream i

sub-channels (e.g., 88.1 H

HD2, and HD3) of varying au

quality.

Stations may eventually go

digital, thus allowing as many

three full-power channels

four low-power channels (se

totals).

http://en.wikipedia.org/wiki/File:FM_spectrum_IBOC.png

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Stations can transmit HD Radio through their existing antennas usin

diplexer as on AM, or are permitted by the FCC to use a separ

antenna at the same location, or at a site licensed as an ana

auxiliary, provided it is within a certain distance and height referencto the analog main signal.

FM is use DBA system, That station is then subdivided into multi

digital streams of between 9 and 12 programs. In contrast FM HD Ra

is assigned to the traditional 200 kilohertz-wide channels, w

capability of 300 Kbit/s in pure digital mode.

FM HD Radio uses a codec based upon the MPEG-4HE-AAC standa

Several psychoacoustic studies/tests have shown HE-AAC code

achieve the same perceived quality as MP2.

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FEATURES

Real time updates.

Artists information. HD radio Review.

Store and replay.

Multimedia support.

On Demand Audio Services.

Worldwide FM band support.

Worldwide AM (MW) band support. Digital audio output.

FM multi-path channel equalizer.

Dynamic AM and FM channel bandwidth control.

Configurable AM and FM noise blanking.

Configurable FM stereo-mono blend.

Multi-path detection and mitigation.

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BROADCAST STATUS OF HD RADIO IN U

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BROADCAST STATUS OF HD RADIO OVE

THE WORLD

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APPLICATION

S

OEM car radio systems.

OEM automotive infotainment systems.

Aftermarket car radio systems.

OEM car PND docking system.

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THANKS

TO

GIVE YOUR

ATTENTION