THIS NOTE AND THE SHARES  ISSUABLE  UPON  CONVERSION  OF THIS NOTE HAVE NOT BEEN
REGISTERED  UNDER THE  SECURITIES ACT OF 1933, AS AMENDED,  OR APPLICABLE  STATE
SECURITIES  LAWS. THIS NOTE AND THE SHARES ISSUABLE UPON CONVERSION OF THIS NOTE
HAVE  BEEN  ACQUIRED  FOR  INVESTMENT   PURPOSES  ONLY  AND  MAY  NOT  BE  SOLD,
TRANSFERRED,  ASSIGNED OR  OTHERWISE  DISPOSED OF IN THE ABSENCE OF AN EFFECTIVE
REGISTRATION  STATEMENT FOR THE SECURITIES  UNDER THE SECURITIES ACT OF 1933, AS
AMENDED,  AND  APPLICABLE  STATE  SECURITIES  LAWS,  OR AN  OPINION  OF  COUNSEL
REASONABLY  SATISFACTORY TO ARTERA GROUP, INC. THAT REGISTRATION IS NOT REQUIRED
UNDER SAID ACT OR APPLICABLE  STATE  SECURITIES  LAWS OR UNLESS SOLD PURSUANT TO
RULE 144 UNDER SAID ACT.

                                CONVERTIBLE NOTE

     FOR VALUE RECEIVED, ARTERA GROUP, INC., a Delaware corporation (hereinafter
called  "Borrower"),  hereby  promises  to  pay  to_____________________,   Fax:
____________  (the "Holder") or order,  without  demand,  the sum of ___________
($_________), with simple interest accruing at the annual rate of 6%, on May 25,
2002 (the "Maturity Date").

     The following terms shall apply to this Note:

                                    ARTICLE I

                               PAYMENT PROVISIONS

     1.1 Payment  Grace  Period.  The  Borrower  shall have a ten (10) day grace
period to pay any monetary amounts due under this Note, after which grace period
a  default  interest  rate of 18% per  annum  shall  apply to the  amounts  owed
hereunder.

     1.2 Conversion  Privileges.  The Conversion Privileges set forth in Article
II shall  remain in full force and effect  immediately  from the date hereof and
until the Note is paid in full.

     1.3  Interest  Rate.  Subject to the  Holder's  right to convert,  interest
payable on this Note shall  accrue at the annual rate of six percent (6%) and be
payable on the Maturity Date,  accelerated or otherwise,  when the principal and
remaining  accrued but unpaid  interest  shall be due and payable,  or sooner as
described below.

                                   ARTICLE II

                                CONVERSION RIGHTS

     The  Holder  shall  have the right to  convert  the  principal  amount  and
interest due under this Note into Shares of the  Borrower's  Common Stock as set
forth below.

     2.1. Conversion into the Borrower's Common Stock.

     (a) Right of Conversion. The Holder shall have the right from and after the
issuance  of this Note and then at any time  until this Note is fully  paid,  to
convert any outstanding and unpaid principal portion of this Note, and/or at the
Holder's election, the interest accrued on the Note, (the date of giving of such
notice  of  conversion   being  a   "Conversion   Date")  into  fully  paid  and
nonassessable  shares of common  stock of Borrower  as such stock  exists on the
date of issuance of this Note,  or any shares of capital  stock of Borrower into
which such stock shall hereafter be changed or reclassified (the "Common Stock")
at the  Conversion  Price (as defined in Section 2.1(b)  hereof),  determined as
provided herein.  Upon delivery or transmission by facsimile to the Company of a
copy of a fully  executed  notice of conversion  in the form attached  hereto as
Exhibit  "A"(a  "Notice of  Conversion")  (the date of receipt of such Notice of
Conversion  being a "Delivery  Date"),  Borrower  shall issue and deliver to the
Holder  within  five (5)  business  days from the  Delivery  Date that number of
shares of Common Stock for the portion of the Note converted in accordance  with
the foregoing.  At the election of the Holder,  the Company will deliver accrued
but unpaid  interest on the Note  through the  Conversion  Date  directly to the
Holder on or before the Delivery Date.

     (b) Conversion Rate. The number of shares of Common Stock to be issued upon
each conversion of this Note shall be determined by dividing that portion of the
principal  (and  interest,  at the  election  of the  Holder)  of the Note to be
converted, by the Conversion Price (as defined herein). Subject to adjustment as
provided  in  Section  2.1(c)  hereof,  the  conversion  price  per  share  (the
"Conversion  Price") shall be one hundred  percent  (100%) of the average of the
three  lowest  closing bid prices for the Common  Stock on the OTC Pink  Sheets,
NASD OTC Bulletin Board, NASDAQ SmallCap Market,  NASDAQ National Market System,
American Stock Exchange,  New York Stock Exchange or the Alternative  Investment
Market of the London  Stock  Exchange  ("AIM"),  as  applicable,  or if not then
trading on any of the foregoing,  such other principal  market or exchange where
the Common Stock is listed or traded  (whichever of the foregoing is at the time
the principal  trading  exchange or market for the Common Stock,  the "Principal
Market") for the ten (10) trading days prior to but not including the Conversion
Date.  For  purposes of the AIM,  closing bid price shall mean the last  trading
price on the London  Stock  Exchange's  SEATS PLUS system (the "SEATS  PLUS") as
reported by Bloomberg  Financial.  For purposes of the NASD OTC Bulletin  Board,
closing bid price shall mean the last  closing bid price on the NASDAQ  National
Market System as reported by Bloomberg Financial.

     (c) Adjustments of Conversion  Price. The Conversion Price shall be subject
to adjustment  from time to time upon the happening of certain events while this
conversion right remains outstanding, as follows:



     A.  Merger,  Sale  of  Assets,  etc.  If the  Borrower  at any  time  shall
consolidate  with or merge into or sell or convey all or  substantially  all its
assets to any other  corporation,  this Note, as to the unpaid principal portion
thereof and accrued interest thereon, shall thereafter be deemed to evidence the
right to  purchase  such  number  and kind of  shares  or other  securities  and
property  as would  have been  issuable  or  distributable  on  account  of such
consolidation,  merger,  sale  or  conveyance,  upon  or  with  respect  to  the
securities subject to the conversion or purchase right immediately prior to such
consolidation,  merger,  sale  or  conveyance.  The  foregoing  provision  shall
similarly  apply to  successive  transactions  of a  similar  nature by any such
successor or purchaser.  Without  limiting the generality of the foregoing,  the
anti-dilution  provisions of this Section shall apply to such securities of such
successor or purchaser after any such consolidation, merger, sale or conveyance.

     B.   Reclassification,   etc.  If  the  Borrower  at  any  time  shall,  by
reclassification  or  otherwise,  change  the  Common  Stock  into the same or a
different  number of  securities  of any class or classes,  this Note, as to the
unpaid principal portion thereof and accrued interest thereon,  shall thereafter
be deemed to evidence the right to purchase  such number and kind of  securities
as would have been  issuable as the result of such  change  with  respect to the
Common Stock immediately prior to such reclassification or other change.

     C. Stock Splits,  Combinations and Dividends. If the shares of Common Stock
are  subdivided or combined into a greater or smaller number of shares of Common
Stock,  or if a dividend is paid on the Common Stock in shares of Common  Stock,
the Conversion Price shall be proportionately  reduced in case of subdivision of
shares or stock dividend or proportionately increased in the case of combination
of shares,  in each such case by the ratio  which the total  number of shares of
Common Stock outstanding  immediately after such event bears to the total number
of shares of Common Stock outstanding immediately prior to such event.

     D.  Share  Issuance.  Subject to the  provisions  of this  Section,  if the
Borrower  at any time  shall  issue  any  shares of  Common  Stock  prior to the
conversion of the entire  principal  amount of the Note  (otherwise than as: (i)
provided in Sections 2.1(c)A, 2.1(c)B or 2.1(c)C or this subparagraph D; or (ii)
pursuant to options, warrants, or other obligations to issue shares, outstanding
on the date hereof as  described in the Written  Information,  as such terms are
defined in the Subscription  Agreement between the Company and the Holder, dated
at or about  April 5, 2001 (the  "Subscription  Agreement",  which  Subscription
Agreement is incorporated  herein by this  reference)  ((i) and (ii) above,  are
hereinafter   referred  to  as  the  "Existing   Option   Obligations")   for  a
consideration less than the Conversion Price that would be in effect at the time
of such issue,  then,  and  thereafter  successively  upon each such issue,  the
Conversion Price shall be reduced as follows: (i) the number of shares of Common
Stock  outstanding  immediately  prior to such issue shall be  multiplied by the
Conversion  Price in effect at the time of such issue and the  product  shall be
added to the aggregate consideration, if any, received by the Borrower upon such
issue of additional  shares of Common Stock;  and (ii) the sum so obtained shall
be divided by the number of shares of Common Stock outstanding immediately after
such issue.  The  resulting  quotient  shall be the adjusted  Conversion  Price.
Except for the Existing Option Obligations, for purposes of this adjustment, the
issuance of any  security of the  Borrower  carrying  the right to convert  such
security  into  shares of  Common  Stock or of any  warrant,  right or option to
purchase Common Stock shall result in an adjustment to the Conversion Price upon
the  issuance  of shares of Common  Stock upon  exercise of such  conversion  or
purchase rights.

     (d) During the period the  conversion  right exists,  Borrower will reserve
from its  authorized  and  unissued  Common Stock the number of shares of Common
Stock described in Section 7(f) of the Subscription Agreement to provide for the
issuance of Common Stock upon conversion of this Note.  Borrower represents that
upon  issuance,  such  shares will be duly and  validly  issued,  fully paid and
non-assessable.  Borrower agrees that its issuance of this Note shall constitute
full authority to its officers, agents, and transfer agents who are charged with
the duty of executing  and issuing stock  certificates  to execute and issue the
necessary  certificates  for shares of Common Stock upon the  conversion of this
Note.

     2.2 Method of Conversion. This Note may be converted by the Holder in whole
or in part as described in Section 2.1(a) hereof and the Subscription Agreement.
Upon partial  conversion of this Note, a new Note  containing  the same date and
provisions  of this Note shall be issued by the  Borrower  to the Holder for the
principal  balance of this Note and interest which shall not have been converted
or paid.

                                   ARTICLE III

                                EVENT OF DEFAULT

     The  occurrence  of any of the  following  events  of  default  ("Event  of
Default") shall, at the option of the Holder hereof,  make all sums of principal
and  interest  then  remaining  unpaid  hereon  and all  other  amounts  payable
hereunder  immediately  due and  payable,  all without  demand,  presentment  or
notice, or grace period, all of which hereby are expressly waived, except as set
forth below:

     3.1 Failure to Pay  Principal  or Interest.  The Borrower  fails to pay any
installment of principal or interest hereon when due and such failure  continues
for a period  of ten (10)  days  after  the due  date.  The ten (10) day  period
described  in this  Section  3.1 is the same ten (10) day  period  described  in
Section 1.1 of this Note.

     3.2 Breach of  Covenant.  The Borrower  breaches  any material  covenant or
other term or condition of this Note in any material respect and such breach, if
subject to cure,  continues for a period of seven (7) days after written  notice
to the Borrower from the Holder.

     3.3 Breach of Representations and Warranties.  Any material  representation
or warranty of the Borrower made herein,  in the Subscription  Agreement entered
into by the  Holder  and  Borrower  in  connection  with  this  Note,  or in any
agreement,  statement  or  certificate  given in writing  pursuant  hereto or in
connection therewith shall be false or misleading in any material respect.

     3.4 Receiver or Trustee.  The  Borrower  shall make an  assignment  for the
benefit of creditors,  or apply for or consent to the  appointment of a receiver
or trustee for it or for a substantial part of its property or business; or such
a receiver or trustee shall otherwise be appointed.

     3.5 Judgments.  Any money judgment,  writ or similar final process shall be
entered or filed  against  Borrower or any of its  property or other  assets for
more than $50,000, and shall remain unvacated, unbonded or unstayed for a period
of forty-five (45) days.

     3.6  Bankruptcy.  Bankruptcy,  insolvency,  reorganization  or  liquidation
proceedings  or other  proceedings or relief under any bankruptcy law or any law
for the relief of debtors  shall be instituted by or against the Borrower and if
instituted against Borrower are not dismissed within 45 days of initiation.

     3.7  Delisting.  After  becoming  included  for listing or  quotation  on a
Principal Market: (i) delisting of the Common Stock from the Principal Market or
such other  principal  exchange on which the Common Stock is listed for trading;
(ii)  Borrower's  failure to comply with the  conditions  for listing;  or (iii)
notification that the Borrower is not in compliance with the conditions for such
continued listing.

     3.8 Concession.  A concession by the Borrower,  after applicable notice and
cure periods,  under any one or more obligations in an aggregate monetary amount
in excess of $50,000.

     3.9 Stop  Trade.  An SEC stop  trade  order or  trading  suspension  on any
Principal Market.

     3.10  Failure to  Deliver  Common  Stock or  Replacement  Note.  Borrower's
failure to timely deliver Common Stock to the Holder pursuant to and in the form
required  by this  Note  and  Section  9 of the  Subscription  Agreement,  or if
required a replacement Note.

     3.11  Listing  Default.  Failure of the  Borrower to obtain  trading of the
Common Stock issuable upon  conversion of the Note on the AIM prior to September
15, 2001.

     3.12 Cross Default. A default by the Borrower of a material term, covenant,
warranty or undertaking of any other  agreement to which the Borrower and Holder
are parties,  or the  occurrence  of a material  event of default under any such
other agreement.

     3.13 NCT Group,  Inc.  Default.  A default by NCT Group,  Inc.  (a Delaware
corporation)  of a  material  term,  covenant,  warranty  or  undertaking  of an
Exchange Rights  Agreement and  Registration  Rights  Agreement both dated at or
about May 25,  2001 to which NCT Group,  Inc.  and Holder  are  parties,  or the
occurrence of a material event of default under such other agreements.

                                   ARTICLE IV

                                  MISCELLANEOUS

     4.1 Failure or  Indulgence  Not Waiver.  No failure or delay on the part of
Holder hereof in the exercise of any power,  right or privilege  hereunder shall
operate as a waiver  thereof,  nor shall any single or partial  exercise  of any
such power,  right or privilege preclude other or further exercise thereof or of
any other right, power or privilege.  All rights and remedies existing hereunder
are  cumulative  to, and not  exclusive  of, any  rights or  remedies  otherwise
available.

     4.2 Notices.  Any notice herein  required or permitted to be given shall be
in writing and may be personally  served or sent by fax transmission  (with copy
sent by regular,  certified or registered mail or by overnight courier). For the
purposes hereof, the address and fax number of the Holder is as set forth on the
first page hereof.  The address and fax number of the  Borrower  shall be Artera
Group, Inc., 20 Ketchum Street,  Westport,  CT 06880,  telecopier number:  (203)
226-4338.  Both  Holder and  Borrower  may change the address and fax number for
service  by  service  of  notice  to the  other as  herein  provided.  Notice of
Conversion  shall be deemed  given  when  made to the  Company  pursuant  to the
Subscription Agreement.

     4.3 Amendment Provision. The term "Note" and all reference thereto, as used
throughout this instrument,  shall mean this instrument as originally  executed,
or if later amended or supplemented, then as so amended or supplemented.

     4.4  Assignability.  This Note shall be binding  upon the  Borrower and its
successors  and  assigns,  and shall  inure to the benefit of the Holder and its
successors and assigns, and may be assigned by the Holder.

     4.5 Cost of  Collection.  If default  is made in the  payment of this Note,
Borrower shall pay the Holder hereof  reasonable costs of collection,  including
reasonable attorneys' fees.

     4.6  Governing  Law.  This  Note  shall be  governed  by and  construed  in
accordance  with the laws of the State of New York. Any action brought by either
party  against  the  other  concerning  the  transactions  contemplated  by this
Agreement  shall  be  brought  only in the  state  courts  of New York or in the
federal courts located in the state of New York. Both parties and the individual
signing  this  Agreement  on  behalf  of the  Borrower  agree to  submit  to the
jurisdiction of such courts.  The prevailing  party shall be entitled to recover
from the other party its reasonable attorney's fees and costs.

     4.7 Maximum Payments. Nothing contained herein shall be deemed to establish
or require the  payment of a rate of interest or other  charges in excess of the
maximum  permitted  by  applicable  law.  In the event that the rate of interest
required to be paid or other charges  hereunder exceed the maximum  permitted by
such law,  any  payments in excess of such  maximum  shall be  credited  against
amounts owed by the Borrower to the Holder and thus refunded to the Borrower.

     4.8 Prepayment/Redemption.  This Note may not be paid prior to the Maturity
Date or redeemed without the consent of the Holder.

                       [THIS SPACE INTENTIONALLY LEFT BLANK]





     IN WITNESS WHEREOF,  Borrower has caused this Note to be signed in its name
by its Treasurer on this 25th day of May, 2001.

                                    ARTERA GROUP, INC.


                                    By:________________________________


WITNESS:



- -------------------------------







                                    EXHIBIT A

                          FORM OF NOTICE OF CONVERSION

(To be executed by the Registered Holder in order to convert the Note)


     The  undersigned  hereby elects to convert  $_________ of the principal and
$_________ of the interest due on the Note issued by ARTERA  GROUP,  INC. on May
25, 2001 into  Shares of Common  Stock of ARTERA  GROUP,  INC.  (the  "Company")
according  to the  conditions  set forth in such  Note,  as of the date  written
below.



Date of Conversion:_____________________________________________________________

Conversion Price:_______________________________________________________________


Shares To Be Delivered:_________________________________________________________


Signature:______________________________________________________________________


Print
Name:__________________________________________________________________________


Address:________________________________________________________________________


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