Cypress CY62167EV18 Manual do Utilizador descarregar pdf (Página 17)

US

2012/0147184

A1

standards.

The

chipset

transceiver

activities

can

be

power

cycled

based

on

methods

Which

Will

be

discussed

in

further

detail

below.

[0088]

Implementations

of

the

techniques

described

here

can

be

used

to

achieve

ef?cient

use

of

the

high-bandWidth

radio

104

in

terms

of

energy

per

bit

per

unit

of

range

(distance

betWeen

transmitter

and

receiver)

transferred.

When

active

the radio

can

draW

or

dissipate

relatively

large

amounts

of

poWer,

hoWever,

due

to

the

poWer

cycling

techniques,

the

poWer

consumption

of

the

Wireless

camera

100

can

still

be

substantially

loW.

In

particular,

modulation

techniques

that

use

broad

frequency

channels

in

the

order

of

5

MHZ

can

be

used.

This

is

because

these

techniques

exhibit

loW

energy

per

bit

(of

data)

per

distance

of

transmission.

In

one

implemen

tation,

a

multi-carrier

modulation

technique

such

as

orthogo

nal

frequency

division

modulation

(OFDM)

can

be

used.

In

another

implementation,

a

spread

spectrum

modulation

scheme

such

as

code

division,

multiple access

(CDMA)

can

be

used.

[0089]

The

loW-bandWidth

radio

106

can

be,

e.g.,

a

loW

overhead,

long-range

radio

transceiver.

The

loW-bandWidth

radio

106

can

be

a radio

frequency

and

baseband

chipset

that

implements

any

loW

poWer,

loW-bandWidth

technique

that

Will

likely

have

longer

reach

and

higher

reliability

than

the

bulk

high-bandWidth

radio

104.

One

purpose

of

the

loW

bandWidth

radio

106

is

to

transfer

status,

control

and

alarm

information

to

and from

the

base

station

160.

In receive

mode,

the

poWer

consumption

can

be

extremely

loW

in

comparison

to

the

bulk

radio

104 and

can

be

loW

enough

to

alloW

the

loW-bandWidth

radio

106

to

operate

continuously.

For

example,

the

poWer

consumption

can

be

in

of

the

order

of

tens

of micro

Watts.

[0090]

Using

this

approach,

the

loW-bandWidth

radio

106

has

a

loW

poWer

mode

Where

the

radio

106 can

be

activated

to

respond

to

a

short

duration,

beacon

transmission

that

origi

nates

from

the

base

station

160.

The

bit

stream

information

contained

in

the

beacon

transmission

can

identify

the

correct

camera

and

can

also

have

other

command/

status

information.

In

another

implementation,

the

loW-bandWidth

radio

106

can

be

used

as

a

backup

When

the

bulk

radio

104

fails

oris

disable,

e.g.,

due

to

jamming

signals.

In

this

manner,

reliability

of

the

Wireless

camera

100 can

be

increased

because

there

are

a

primary

high-bandWidth

radio

104

and

secondary

loW-band

Width

radio

106

for

redundancy.

In

certain

implementations,

the

high-bandWidth

radio

104

and

the

loW-bandWidth

radio

106

can

be

in

the

same

transceiver

block.

[0091]

Additionally,

errors

in

the

bit

stream

of

the

beacon

during

transmission

can

be

corrected

by

using

forWard

error

correction

(FEC)

techniques,

such

as

hamming

codes.

Details

of

the

forWard

error

correction

and

its

associated

timing

and

phasing

techniques

Will

be

described

beloW.

The

bit

stream

can

serve

as

a

“Wake-up”

function,

alloWing

the

base

station

160

to

activate

the

correct

Wireless

camera

to

Wake-up

and

perform

certain

tasks

during times

When many

components

of

the

Wireless

camera

may

be

in

the

shut

doWn

mode.

In

one

implementation,

this

loW-bandWidth

radio

106 can

be

achieved

using

“multi-standard”

radio

design,

Which

may

share

portions

or

components

used

in

the

bulk

radio

104.

The

sharing

of

“multi-standar

”

components

can

lead

to

loWer

cost

or

poWer

from

an

overall

system

perspective.

[0092]

As

noted

above,

the

Wireless

camera

100

includes

an

internal

battery

102,

Which

can

be

a

standard

non-recharge

able

battery

or

a

battery

pack.

In

one

implementation,

a

com

bination

of

rechargeable

and

non-rechargeable

batteries

can

Jun.

14,

2012

be

used.

In

another

implementation,

the

rechargeable

battery

can be

replaced

or

augmented

by

so

called

super

capacitors.

Such

capacitors

are

readily

available,

e.g.,

from

companies

like

MaxWell

Technologies

Inc.

The

sources

for

the

recharg

ing

energy

can

include,

e.g.,

solar

cells,

fuel

cells,

galvanic

cells,

?oW

cells,

kinetic

poWer

generators,

and

environmental

energy

sources.

These

energy

sources

Will

be

describe

in

more

detail

beloW.

[0093]

The

Wireless

camera

100

can

make

use

of

extensive

active,

high

ef?ciency,

poWer

regulation

and

boaster

circuitry

to

optimiZe

the

use

of

the

energy

available

from

various

sources.

Some

or

all

of

electronic

processing

and

memory

elements

can

be

integrated

into

a

single

ASIC

to

reduce

cost

and

poWer,

creating

a

single

chip

Wireless

camera.

In

addition

to

the

components

shoWn

in

FIG.

1,

a

Pan,

Tilt

and

Zoom

mechanism

and

control

can

also

be

included

for

user

control

of

the

Wireless

camera

100.

[0094]

FIG.

2

shoWs

a

battery

poWered

Wireless

netWork

camera

system

200

for

video

surveillance

applications.

In

this

example,

the

Wireless

netWork

camera

system

200

includes

a

Wireless

camera

210,

a

base

station

220,

a

Wireless

link

240

connecting

the

Wireless

camera 210 and

the

base

station

220,

and

a

remote

client

250.

The

system

200

can

further

include

a

netWork

260

connecting

the

base

station

220

and

the

remote

client

250.

The

netWork

260

can

be

a

LAN

or

Wide

area

netWork

(WAN),

a

Wireless

netWork

(e.g.,

WiFi,

WiMax,

or

cellular

netWorks),

or

poWer

over

ethemet

netWork

(e. g.,

based

on

the

IEEE

802.a3f

standard).

In

other

implementa

tions,

this

netWork

connection

can

be

replaced

by

a universal

serial

bus

(U

SB)

interconnect

directly

connected

to

a

com

puting

device.

From

the

client

250

or

netWork

260

perspec

tive,

the

Wireless

netWork

camera

system

200

can

support

extensive

ethemet

protocols

including

IP,

HTTP,

HTTPS,

802.1x,

TCP,

ICMP,

UDP,

SMTP,

FTP,

DHCP,

UPnPTM,

Bon

jour,

ARP,

DNS,

DynDNS,

and

NTP.

In

particular,

the

base

station

code

can

comply

With

Well

established

IP

camera

API’s

from

companies

such

as

Axis

communication’s

“VAPIX”

API

or

similar

API’s.

[0095]

A

suitable

Wireless

camera

in

FIG.

2

can

be

imple

mented

in

various

con?gurations,

including

the

Wireless

cam

era

100

described

in

FIG.

1.

The

base

station

220

can

receive

information

(e.g.,

video

and

audio

information)

from

the

Wireless

camera

210

through

the

Wireless

link

240

and

pro

cess the

received

information.

The

base

station

220

can

also

be

one

or

more

computers

performing

similar

functions

as

a

Wireless

base

station

220

and

running

a

surveillance

applica

tion.

Hence,

the

computers

can

function

as

the

base

station

220

and

the

client

250.

For

example, FIG.

3

shoWs

another

battery

poWered

Wireless

netWork

camera

system

300

for

remote

surveillance

applications,

Where

the

surveillance

cli

ent

runs

on

the

same

system

as

the

base

station

220,

and

the

virtual

Web

server

in

the

base

station

220

can

be

eliminated.

[0096]

Referring

back

to

FIG.

2,

the

base

station

220

includes

a

virtual

Web

server

222

for

relaying

or

transmitting

processed

information

to

a

remote

client.

The

Web

server

222

can

act

as

a virtual/proxy

Web

camera

server.

Further,

the

Web

server

222

can

shield

the

remote

client

250

(running

a

sur

veillance

application)

from

the

burst

transmission

mecha

nism

(Which

Will

be

discussed

in

further

detail

beloW) of

the

Wireless

camera

210.

In

addition,

the

Web

server

222

can

act

as

a

virtual

Web

server

or

relay

server

for

a

number

of

Wireless

cameras,

aggregating

the

video

streams

but

appearing

to

the

surveillance

remote

client

250

as

multiple

separate

virtual

IP

cameras.

The

Web

server

222

can

therefore

transmit

the

cam

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