us
`
`DOCKET NUMBER
`121USO
`
`As a below named inventor, I hereby declare that:
`
`My residence, post office address and citizenship are as stated below next to my name.
`
`I believe I am the original, first and sole inventor (if only one name is listed below) or an original, first and joint inventor (if plural
`names are listed below) of the subject matter which is claimed for and which a patent is sought on the invention entitled:
`
`HIGH FREQUENCY CONTENT RECOVERING METHOD AND DEVICE FOR OVER-SAMPLED SYNTHESIZED WIDEBAND
`SIGNAL
`
`the specification of which (check only one item below):
`
`[ ]
`
`[]
`
`is attached hereto.
`
`was filed as United States application
`
`Serial N o . - - - -
`
`on ____ _ _
`
`and was amended
`
`on - - - - - - (if applicable).
`
`[X]
`
`was filed as PCT international application
`
`Number PCT/CA99/00990
`
`on 27 October 1999
`
`and was amended under PCT Article 19
`
`on - - - - - - (if applicable).
`
`I hereby state that I have reviewed and understand the contents of the above-identified specification, including the claims as amended by
`any amendment referred to above.
`
`I acknowledge the duty to disclose information which is material to the examination of this application in accordance with Title 37. Code
`of Federal Regulations, §1.56(a).
`
`I hereby claim foreign priority benefits under Title 35, United States Code, §119 of any foreign application(s) for patent or inventor's
`certificate or of any PCT international application(s) designating at least one country other than the United States of America listed below
`and have also identified below any foreign application(s) for patent or inventor's certificate or any PCT international application(s)
`designating at least one country other than the United States of America tiled by me on the same subject matter having a tiling date
`before that of the application(s) of which priority is claimed:
`
`PRIOR FOREIGNIPCT APPLICATION(S)
`
`UNDER 35 U.S.C. 119:
`
`Canada
`
`170
`
`27 October 1998
`
`[X] YES
`
`(] YES
`
`0 YES
`
`0 YES
`
`0 YES
`
`(]NO
`
`0 NO
`
`0 NO
`
`0 NO
`
`0 NO
`
`PTO 1391 IREV. 10/83)
`
`Page 1 of 2
`
`US DEPARTMENT OF COMMERCE Patent and Trademark Office
`
`(January 1991)
`
`ZTE EXHIBIT 1002
`
`Page 1 of 666
`
`

`
`il
`
`l
`
`us
`
`4
`
`for P'atent
`•• •·
`(Includes Reference to PCT International
`
`Power of Attorney (Continued)
`•
`
`A TTY'S DOCKET NUMBER
`3795/0J121USO
`
`,. ~ •
`
`"
`I hereby claim the benefit under Title 35, United States Ccxle, §120 of any United States application(s) or PCT international
`application(s) designating the United States of America that is/are listed below and, insofar as the subject matter of each of the
`claims of this application is not disclosed in that/those prior application(s) in the manner provided by the first paragraph of Title 35,
`United States Ccxle §112, I acknowledge the duty to disclose material information as defined in Title 37, Ccxle of Federal
`Regulations, § 1.56(a) which occurred between the filing date of the prior application(s) and the national or PCT international filing
`date of this application:
`
`PRIOR U.S. APPLICATIONS OR PCT INTERNATIONAL APPLICATIONS DESIGNATING THE U.S. FOR BENEFIT UNDER
`35 u.s.c. 120:
`U.S APPI
`U.S APPIII":ATIC11\1 NUMBER
`
`II~N~
`
`U.S. FILING DATE
`
`I" A
`
`STATUS (Check on• I
`PENDING
`
`PCT .II.PP
`PCT APPLICATION NO.
`
`I UN;:,
`PCT FILING DATE
`
`IN\.:1 THE u.s.
`ASSIGNED (;f anyl
`
`27 October 1 999
`
`POWER OF ATTORNEY: As a named inventor, I hereby appoint the following attorney(s) and/or agents to prosecute this application and
`transact all business in the Patent and Trademark Office connected therewith. Morris Relson #15,108, Gordon D. Coplein #19,165,
`William F. Dudine, Jr. #20,569, Michael J. Sweedler #19,937, S. Peter Ludwig #25,351, Paul Fields #20,298, Joseph B. Lerch
`#26,936, Melvin C. Garner #26,272, Ethan Horwitz #27,646, Beverly B. Goodwin #28.417, Adda C. Gogoris #29,714, Martin E.
`Goldstein #20,869, Bert J. Lew en 19,407, Henry Sternberg #22,408, Peter C. Schechter #31 ,662, Robert Schaffer #31, 194,Robert C.
`Sullivan, Jr. #30,499, and Joseph R. Robinson #33,448
`Send Correspondence to:
`
`Direct Telephone Calls to:
`(name and telephone number)
`
`2
`
`0
`
`1
`2
`
`0
`
`2
`2
`
`0
`
`3
`
`DARBY & DARBY P.C.
`805 Third Avenue
`New York, New York 10022-7513
`FAMILY NAME
`FIRST GIVEN NAME
`BESSETTE
`Bruno
`
`~~l~~~~T~R
`
`~~~~~~~~p&
`
`CITY
`Rock Forest
`
`POST OFFICE
`ADDRESS
`
`POST OFFICE ADDRESS
`1 546 Perodeau
`
`6~~~~::.~R
`
`FAMILY NAME
`SALAMI
`
`RESIDENCE &
`CITIZENSHIP
`
`:~~~:~ICE
`
`CITY
`Sherbrooke
`
`POST OFFICE ADDRESS
`963 Leo Laliberte
`
`6~~~~::.~R
`
`FAMILY NAME
`LEFEBVRE
`
`~~T~~~~~~p&
`
`CITY
`Canton de Magog
`
`STATE OR FOREIGN COUNTRY
`Canada
`
`CITY
`Rock Forest
`
`FIRST GIVEN NAME
`Red wan
`
`STATE OR FOREIGN COUNTRY
`
`CITY
`Sherbrooke
`
`FIRST GIVEN NAME
`Roch
`
`STATE OR FOREIGN COUNTRY
`Canada
`
`:~~~~~ICE
`
`POST OFFICE ADDRESS
`259, avenue de Ia Bourgade
`
`CITY
`Canton de Magog
`
`Canada
`J1 K 5R9
`I hereby declare that all statements made herein of my own knowledge are true and that all statements made on information and
`belief are believed to be true; and further that these statements were made with the knowledge that willful false statements and the
`like so made are punishable by fine or imprisonment, or both, under section 1001 of Title 18 of the United States Ccxle, and that
`su~h will fill false statements may
`~ vaJiclity ofth(! appiication or any patent issuing thereon.
`SIGNATURE
`
`(212) 527-7700
`Lisa J. Ulrich
`
`SECOND GIVEN NAME
`
`COUNTRY OF CITIZENSHIP
`Canada
`
`STATE & ZIP
`Quebec, Canada
`J1 N 1 L2
`SECOND GIVEN NAME
`
`COUNTRY OF CITIZENSHIP
`Canad;
`STATE & ZIP
`Quebec, Canada
`J1 J 4L3
`SECOND GIVEN NAME
`
`COUNTRY OF CITIZENSHIP
`Canada
`
`STATE
`
`DATE
`
`DATE
`
`DATE
`
`PTO 1391 (REV. 10/831
`
`Page 2 of 2
`
`US DEPARTMENT OF COMMERCE Patent and Trademark Office
`
`Page 2 of 666
`
`

`
`Q9/830332
`
`Dt1/Mf'l11niiNII of~
`P•tent ilntl rrlldtllnilrll omee
`lt!ttiWIMYI
`
`(
`
`04/30/2001 MHGUYEN 00000005 09830332
`01 FC:971
`430.00 OP
`02 FC:9&7
`360.00 OP
`03 FC:965
`160.00 OP
`
`Page 3 of 666
`
`

`
`·(§EsT AVAILABLE CO
`
`PATENT APPLICAT~ . FEE DETERMINATION RECORIJ
`Effective October 1, 2000
`
`Application or Docket Number
`
`1918303}2
`
`CLAIMS AS FILED - PART I
`
`TOTAL CLAIMS
`
`FOR
`
`TOTAL CHARGEABLE CLAIMS
`
`NUMBER FILED
`
`INDEPENDENT CLAIMS
`
`\ minus 3 =
`MULTIPLE DEPENDENT CLAIM PRESENT
`
`D
`• If the difference in column 1 is less than zero, enter "0" in column 2
`
`CLAIMS AS AMENDED - PART II
`
`PRESENT
`EXTRA
`
`=
`
`PRESENT
`EXTRA
`
`=
`
`SMALL ENTITY
`TYPE CJ2:1
`RATE
`FEE
`BASIC FEE 14~\)
`X$ 9=
`
`X40=
`
`+135=
`
`TOTAL
`
`OTHER THAN
`OR SMALL ENTITY
`
`OR X$18=
`XBO=
`
`OR
`
`OR +270=
`OR TOTAL
`
`OTHER THAN
`SMALL ENTITY OR SMALL ENTITY
`ADD I·
`ADD I-
`RATE TIONAL
`TIONAL
`FEE
`
`RATE
`
`X$9=
`
`X40=
`
`+135=
`TOTAL
`ADDIT. FEE
`
`OR X$18=
`OR X80=
`
`OR +270=
`
`OR AOOIT.
`
`ADD I-
`RATE TJONAL
`FEE
`
`RATE
`
`ADD I-
`TIONAL
`
`X$9=
`
`X40=
`
`+135=
`TOTAL
`ADDIT. FEE
`
`OR X$18=
`OR X80=
`
`OR +270=
`
`OR AOOIT.
`
`PRESENT
`EXTRA
`
`ADD I·
`RATE TIONAL
`FEE
`
`ADD I-
`RATE TIONAL
`
`X$9=
`
`X40=
`
`OR X$18=
`OR X80=
`
`• If the entry,ln column 1.1s less ihan the entry In column 2; write "0" In column 3.
`.. If the "Highest Numb&r P.revtousJy Paid For"· IN THI.S SPACE Is less than 20, enter "20:
`... ,, til$ "Highest Number.Prevfously·Pald for" IN 11-fiS SPACE Is less than 3, enter "3:
`· · The '1:ilghest Num~r Prevlously'P<ild For" (Total or lndepeoo,ent) .Is the highest number found In ~e appropriate box In column 1 .
`. ·' ..
`
`+135=
`TOTAL
`AOOIT. FEE
`
`OR +270=
`
`OR ADOIT. FEE ' - - - t
`
`(RGY.&'OO)
`
`Palenl and Trademark Office, U.S. DEPARTMENT OF COMMERCE
`
`Page 4 of 666
`
`

`
`MULTIPLE DEPENDENT CLAIM
`, ~~ C.ALCULATIO~ ~.
`f.!'v.n VSE WITH FORM~ .. ..,..._.,,
`.
`
`AS FILED
`
`AF'l ER
`
`AFri!R
`
`A
`
`IS
`
`IND..
`
`DEP.
`
`IND.
`
`DEP.
`
`IND,
`
`DEP.
`
`IND.
`
`DEP.
`
`IND.
`
`DEP.
`
`INC
`
`DEP,
`
`3
`
`'1_
`8
`9
`
`11
`
`16
`
`19
`20
`21
`_22
`
`' _24_
`25
`26
`_27_
`21
`
`-
`
`-
`
`0
`
`33
`
`-~
`- 39
`- 40
`-~
`- 42
`- 43
`
`4J
`
`f
`I
`\
`I
`\
`I
`\
`\ II
`\
`I
`I
`I
`I
`1-\
`\
`\
`
`\
`"'.
`'\
`
`I
`I
`I
`
`\ /
`
`I 1\
`I
`""
`I
`\
`I
`
`1\
`\
`\
`\
`
`I
`J
`J
`I
`IY
`\
`
`\
`
`\
`
`/
`I
`\
`\
`\
`\
`I
`I
`I
`I
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`J
`_/
`I
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`\ I
`
`\
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`
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`I
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`
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`\
`
`\
`
`II\
`I
`\
`I
`\
`I
`
`\
`
`61
`62
`1\S
`64
`66
`66
`67
`58
`69
`60
`61
`62
`63
`64
`65
`66
`67
`68
`69
`70
`71
`72
`78
`74
`76
`76
`77
`78
`79
`80
`81
`82
`83
`84
`85
`
`'.
`
`91
`92
`93
`94
`95
`
`Page 5 of 666
`
`

`
`This Page Is Inserted by IFW Operations
`and is not a part of the Official Record
`
`BEST AVAILABLE IMAGES
`
`Defective images within this document are accurate representations of the
`original documents submitted by the applicant.
`
`·Defects in the images may include (but are not limited to): .
`
`• BLACK BORDERS
`
`• TEXT CUT OFF AT TOP, BOTTOM OR SIDES
`
`• FADEDTEXT
`
`•
`
`ILLEGIBLE TEXT
`
`• SKEWED/SLANTED IMAGES
`
`• COLORED PHOTOS
`
`• BLACK OR VERY BLACK AND WHITE DARK PHOTOS
`
`• ORA Y SCALE DOCUMENTS
`
`IMAGES ARE BEST AVAILABLE COPY.
`
`As rescanning documents will not correct images,
`please do not report the images to the
`Image Problems Mailbox.
`
`Page 6 of 666
`
`

`
`.--
`
`'opy for the Elected Office (EO/US)
`
`PCT /CA99/00990
`
`P"
`
`""71\JT COOPERATION TREAT'
`
`PCT
`
`From the INTERNATIONAL BUREAU
`
`To:
`
`NOTIFICATION OF THE RECORDING
`OF A CHANGE
`
`(PCT Rule 92bis.1 and
`Administrative Instructions, Section 422)
`
`Date of mailing (d~y/month/year)
`13 June 2000 (13.06.00)
`
`Applicant's or agent's file reference
`GP/12916.12
`1 - - ·
`lntemationr.l application No.
`PCT /CA99/00990
`
`DUBUC, Jean, H.
`Goudreau Gage Dubuc
`The Stock Exchange Tower
`Suite 3400
`800 Place Victoria
`Montreal, Quebec H4Z 1 E9
`CANADA
`
`IMPORTANT NOTIFICATION
`
`International filing date (day/month/year)
`27 October 1999 (27 .1 0.99)
`
`1. The following indications appeared on record concerning:
`
`D the applicant
`
`0 the inventor
`
`0 the agent
`
`Name and Address
`DUBUC, Jean, H.
`Goudreau Gage Dubuc & Martineau
`Walker
`The Stock Exchange Tower
`Suite 3400
`800, Place Victoria
`Montreal, Quebec H4Z 1 E9
`Canada
`
`D the common representative
`I State of Residence
`
`State of Nationality
`
`Telephone No.
`514 397 7609
`Facsimile No.
`514 397 4382
`Teleprinter No.
`
`2. The International Bureau hereby notifies the applicant that the following change has been recorded concerning:
`
`D the person
`
`0 the name
`
`0 the address
`
`0 the nationality
`
`0 the residence
`I State of Residence
`
`Name and Address
`DUBUC, Jean, H.
`Goudreau Gage Dubuc
`The Stock Exchange Tower
`Suite 3400
`800 Place Victoria
`Montreal, Quebec H4Z 1 E9
`Canada
`
`State of Nationality
`
`Telephone No.
`514 397 7609
`Facsimile No.
`514 397 4382
`Teleprinter No.
`
`3. Further observations, if necessary:
`The new agent's address on the Demand has been considered as a change under Rule 92bis. In
`case of disagreement, the International Bureau should be notified immediately.
`-
`
`4. A copy of this notification has been sent to:
`
`0 the receiving Office
`D the International Searching Authority
`0 the International Preliminary Examining Authority
`
`D the designated Offices concerned
`0 the elected Offices concerned
`D other:
`
`The International Bureau of WIPO
`34, chemin des Colombettes
`1211 Geneva 20, Switzerland
`
`Facsimile No.: (41-22) 740.14.35
`
`Form PCT/IB/306 (March 1994)
`
`Authorized officer
`
`C.Cupello
`
`Telephone No.: (41-22) 338.83.38
`
`003344631
`
`Page 7 of 666
`
`

`
`P1-
`
`-.\IT COOPERATION TREAT
`
`PCT
`
`To:
`
`From the INTERNATIONAL BUREAU
`
`PCT /CA99/00990
`
`NOTIFICATION OF ELECTION
`
`(PCT Rule 61.2)
`
`Date of mailing (day/month/year)
`13 June 2000 (13.06.00)
`
`International application No.
`PCT /CA99/00990
`
`International filing date (day/month/year)
`27 October 1999 (27 .1 0.99)
`
`Applicant
`
`BESSETTE, Bruno et al
`
`Assistant Commissioner for Patents
`United States Patent and Trademark
`Office
`Box PCT
`Washington, D.C.20231
`ETATS-UNIS D'AMERIOUE
`
`in its capacity as elected Office
`
`Applicant's or agent's file reference
`GP/12916.12
`
`Priority date (day/month/year)
`27 October 1998 (27, 1 0,98)
`
`1. The designated Office is hereby notified of its election made:
`
`[8] in the demand filed with the International Preliminary Examining Authority on:
`28 April 2000 (28.04.00)
`
`0 in a notice effecting later election filed with the International Bureau on:
`
`2. The election
`
`[8] was
`D was not
`
`made before the expiration of 19 months from the priority date or, where Rule 32 applies, within the time limit under
`Rule 32.2(b).
`
`The International Bureau ofWIPO
`34. chemin des Colombettes
`1211 Geneva 20, Switzerland
`
`Facsimile No.: (41·22) 740.14.35
`
`Form PCT/IB/331 (July 1992)
`
`Authorized officer
`
`C.Cupello
`
`Telephone No.: (41·22) 338.83.38
`
`CA9900990
`
`Page 8 of 666
`
`

`
`P .T COOPERATION TREATY
`PCT
`
`•
`
`INTERNATIONAL SEARCH REPORT
`
`(PCT Article 18 and Rules 43 and 44)
`FOR FURTHER see Notification of Transmittal of International Search Report
`(Form PCT/ISA/220) as well as, where applicable, item 5 below.
`ACTION
`International filing date {day/month/year)
`
`(Earliest) Priority Date (day/month/year)
`
`27/10/1999
`
`27110/1998
`
`Applicant's or agent's file reference
`GP/12916.12
`International application No.
`PCT I CA 99/ 00990
`Applicant
`
`VOICEAGE CORPORATION et al.
`
`This International Search Report has been prepared by this International Searching Authority and is transmitted to the applicant
`according to Article 18. A copy is being transmitted to the International Bureau.
`
`3
`sheets.
`This International Search Report consists of a total of
`[!]
`It is also accompanied by a copy of each prior art document cited in this report.
`
`1 . Basis of the report
`a. With regard to the language, the international search was carried out on the basis of the international application in the
`language in which it was filed, unless otherwise indicated under this item.
`0
`the international search was carried out on the basis of a translation of the international application furnished to this
`Authority (Rule 23.1 (b)).
`b. With regard to any nucleotide and/or amino acid sequence disclosed in the international application, the international search
`was carried out on the basis of the sequence listing :
`0
`contained in the international application in written form.
`0
`filed together with the international application in computer readable form.
`0
`0
`0
`0
`
`furnished subsequently to this Authority in written form.
`furnished subsequently to this Authority in computer readble form.
`the statement that the subsequently furnished written sequence listing does not go beyond the disclosure in the
`international application as filed has been furnished.
`the statement that the information recorded in computer readable form is identical to the written sequence listing has been
`furnished
`
`2.
`
`3.
`
`0
`0
`
`Certain claims were found unsearchable (See Box 1).
`
`Unity of invention Is lacking (see Box II).
`
`4. With regard to the title,
`~ the text is approved as submitted by the applicant.
`0
`the text has been established by this Authority to read as follows:
`
`5. With regard to the abstract,
`~ the text is approved as submitted by the applicant.
`0
`the text has been established, according to Rule 38.2(b), by this Authority as it appears in Box Ill. The applicant may,
`within one month from the date of mailing of this international search report, submit comments to this Authority.
`6. The figure of the drawings to be published with the abstract is Figure No.
`[!]
`0
`0
`
`?
`0
`
`None of the figures.
`
`as suggested by the applicant.
`
`because the applicant failed to suggest a figure.
`because this figure better characterizes the invention.
`
`Form PCT/ISA/210 (first sheet) (July 1998)
`
`Page 9 of 666
`
`

`
`INTERNATIONAL SEARCH REPORT
`
`A. CLASSIFICATION OF ABJECT MATTER
`IPC 7 G10L21 02
`
`•
`
`Inter.! Application No
`PC
`99/00990
`
`I
`
`According to International Patent Classification (I PC) or to both national classification and IPC
`
`B. FIELDS SEARCHED
`Minimum documentation searched (classification system followed by classification symbols)
`IPC 7 G10L
`
`Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched
`
`Electronic data base consuHed during the international search (name of data base and, where practical, search terms used)
`
`C. DOCUMENTS CONSIDERED TO BE RELEVANT
`
`Category o Citation of document, with indication, where appropriate, of the relevant passages
`
`Relevant to claim No.
`
`A
`
`A
`
`"BANDWIDTH ENHANCEMENT OF
`CARL H ET AL:
`NARROW-BAND SPEECH SIGNALS"
`SIGNAL PROCESSING: THEORIES AND
`APPLICATIONS,XX,X~, page 1178-1181
`XP000783776
`abstract
`page 1180
`
`---
`"Statistical
`VAN MING CHENG ET AL:
`recovery of wideband speech from
`narrowband speech"
`IEEE TRANSACTIONS ON SPEECH AND AUDIO
`PROCESSING, OCT. 1994, USA,
`vol. 2, no. 4, pages 544-548, XP000874178
`ISSN: 1063-6676
`abstract
`paragraphs '0001!, '002A!, '002C!
`---
`-1--
`
`1,4
`
`1,4
`
`[]] Further documents are listed in the continuation of box C.
`
`[[] Patent family members are listed in annex.
`
`o Special categories of cited documents :
`
`"A" document defining the general state of the art which is not
`considered to be of particular relevance
`"E" ear1ier document but published on or after the international
`filing date
`"L" document which may throw doubts on priority claim(s) or
`which is cited to establish the publication date of another
`citation or other special reason (as specified)
`"0" document referring to an oral disclosure, use, exhibition or
`other means
`"P" document published prior to the intemational filing date but
`later than the pr1ority date claimed
`
`"T" later document published after the international filing date
`or priority date and not in conflict with the application but
`cited to understand the principle or theory under1ying the
`invention
`"X" document of particular relevance; the claimed invention
`cannot be considered novel or cannot be considered to
`involve an inventive step when the document is taken alone
`"Y" document of particular relevance; the claimed invention
`cannot be considered to involve an inventive step when the
`document is combined with one or more other such docu-
`ments. such combination being obvious to a person skilled
`in the art.
`"&" document member of the same patent family
`
`Date of the actual completion of the international search
`
`Date of mailing of the international search report
`
`31 January 2000
`
`Name and mailing address of the ISA
`European Patent Office, P.B. 5818 Patentlaan 2
`NL - 2280 HV Rijswijk
`Tel. (+31-70) 340-2040, Tx. 31 651 epo nl,
`Fax: (+31-70) 340-3016
`
`2
`
`Fonn PCT/ISA/21 0 (second sheet) (July 1992)
`
`08/02/2000
`
`Authorized officer
`
`Van Doremalen, J
`
`page 1 of 2
`
`Page 10 of 666
`
`

`
`INTERNATIONAL SEARCH REPORT
`
`A
`
`A
`
`US 5 455 888 A (IYENGAR VASU
`3 October 1995 (1995-10-03)
`abstract
`
`ET AL)
`
`EP 0 838 804 A (SONY CORP)
`29 April 1998 (1998-04-29)
`page 3, line 5- line 15
`
`Application No
`99/00990
`
`Relevant to claim No.
`
`1,4
`
`1,4
`
`2
`
`Form PCTIISA/21 0 (continuation of second sheet) (July 1992)
`
`page 2 of 2
`
`Page 11 of 666
`
`

`
`INTERNATIONAL SEARCH REPORT
`patent family members
`
`Application No
`
`Patent document
`cited in search report
`us 5455888
`
`EP 0838804
`
`A
`
`A
`
`Patent family
`member(s)
`
`Publication
`date
`
`03-10-1995
`
`NONE
`
`29-04-1998
`
`JP
`CN
`us
`
`10124088 A
`1185616 A
`5950153 A
`
`15-05-1998
`24-06-1998
`07-09-1999
`
`Form PCT/ISN21 0 (patem family annex) (July 1992)
`
`Page 12 of 666
`
`

`
`PCT
`INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PC1)
`WO 00/25305
`
`w.
`
`j INTELLECTUAL PROPERTY ORGANIZATION
`International Bureau
`
`(51) International Patent Classification 7 :
`GlOL 21/02
`
`(11) InternationaiPublication Number:
`
`At
`
`(43) International Publication Date:
`
`4 May 2000 (04.05.00)
`
`(21) International Application Number:
`
`PCf/CA99/00990
`
`(22) International Filing Date:
`
`27 October 1999 (27.10.99)
`
`(30) Priority Data:
`2,252,170
`
`27 October 1998 (27.10.98)
`
`CA
`
`(71) Applicant (for all designated States except US): VOICEAGE
`CORPORATION
`(CNCA); Suite 200, 750, Chemin
`Lucerne, Ville Mont-Royal, Quebec H3R 2H6 (CA).
`
`(72) Inventors; and
`(75) Inventors/Applicants (for US only): BESSETTE, Bruno
`(CA/CA); 1546 P6rodeau, Rock Forest, Quebec JIN IL2
`(CA). SALAMI, Redwan [CNCAJ; 963, Uo Laliberte,
`Sherbrooke, Quebec JIJ 4L3 (CA). LEFEBVRE, Roch
`(CNCA); 259, avenue de Ia Bourgade, Canton de Magog,
`Quebec JIK 5R9 (CA).
`
`(74) Agents: DUBUC, Jean, H. et al.; Goudreau Gage Dubuc &
`Martineau Walker, The Stock Exchange Tower, Suite 3400,
`800, Place Victoria, Montreal, Quebec H4Z IE9 (CA}.
`
`(81) Designated States: AE, AL, AM, AT, AU, AZ, BA, BB, BG,
`BR, BY, CA, CH, CN, CR, CU, CZ, DE, DK, DM, EE,
`ES, Fl, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP,
`KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA,
`MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT,-RO, RU,
`SD, SE, SG, Sl, SK, SL, TJ,TM, TR, TT, TZ, UA, UG,
`US, UZ, VN, YU, ZA, ZW, ARIPO patent (GH, GM, KE,
`LS, MW, SD, SL, SZ, TZ, UO, ZW), Eurasian patent (AM,
`AZ, BY, KG, KZ, MD, RU, TJ, TM), European patent (AT,
`BE, CH, CY, DE, DK, ES, Fl, FR, GB, GR, IE, IT, LU,
`MC, NL, PT, SE), OAPI patent (BF, BJ, CF, CG, CI, CM,
`GA, GN, GW, ML, MR, NE, SN, TD, TG).
`
`Published
`With international search report.
`
`(54) Title: HIGH FREQUENCY CONTENT RECOVERING. METHOD AND DEVICE FOR OVER-SAMPLED SYNTHESIZED
`WIDEBAND SIGNAL
`
`.200
`
`/
`
`i
`I
`
`I
`I·
`
`I
`
`(57) Abstract
`
`In a method and device for recovering the high frequency content of a wideband signal previously down-sampled during enccxling,
`and for injecting, during deccxling, this high frequency content in an over-sampled synthesized version of the wideband signal to produce a
`full-spectrum synthesized wideband signal, a white noise generator produces a white noise sequence. Serially interconnected gain adjustment
`unit, spectral shaper and band-,pass filter spectrally shapes the white noise sequence in relation to a s~t of shaping parameters representative
`of the down-sampled wideband signal such as a voicing factor, an energy scaling factor, a tilt scifiing factor, and linear prediction.filrer
`coefficients. A signal injection circuit finally injects the spectrally-..shaped white noise sequence in the over-sampled synthesized-signal
`version. to thereby prcxluce the full-spectrum synthesized wideband signal.
`
`OUTPUT
`SPE"ECH
`
`Page 13 of 666
`
`

`
`I
`·)
`I
`
`i
`i
`I
`i
`I
`
`I
`
`I
`I
`I
`I
`!
`·I
`
`·:I
`,I
`
`'I
`i
`!
`
`:j
`
`Codes used to identify States party to the Per on the front pages of pamphlets publishing international applications under the PCf.
`
`FOR THE PURPOSES OF INFORMATION ONLY
`
`AL
`AM
`AT
`AU.
`AZ
`BA
`BB
`BE
`BF
`BG
`BJ
`BR
`BY
`CA
`CF
`CG
`CH
`Cl
`CM
`CN
`cu
`cz
`DE
`OK
`E£
`
`Albania
`Annenia
`Austria
`Australia
`Azerbaijan
`Bosnia and Herzegovina
`Barbados
`Belgium
`Burkina Faso
`Bulgaria
`Benin
`Brazil
`Belarus
`Canada
`Central African Republic
`Congo
`Switzerland
`COte d"lvoire
`Cameroon
`China
`Cuba
`Czech Republic
`Germany
`Den marie
`Estonia
`
`ES
`Fl
`FR
`GA
`GB
`GE
`GH
`GN
`GR
`HU
`IE
`IL
`IS
`IT
`JP
`KE
`KG
`KP
`
`KR
`KZ
`LC
`u
`LK
`LR
`
`Spain
`Finland
`France
`Gabon
`United Kingdom
`Georgia
`Ghana
`Guinea
`Greece
`Hungary
`Ireland
`Israel
`Iceland
`Italy
`Japan
`Kenya
`Kyrgyzstan
`Democratic People"s
`Republic; of Korea
`Republic of Korea
`Kaz.akstan
`Saint Lucia
`Liechtenstein
`S..i Lanlca
`Liberia
`
`LS
`LT
`LU
`LV
`MC
`MD
`MG
`MK
`
`ML
`MN
`MR
`MW
`MX
`NE
`NL
`NO
`NZ
`PL
`PT
`RO
`RU
`SD
`SE
`SG
`
`Lesod10
`Lithuania
`Luxembourg
`l..alvia
`Monaro
`Republic of Moldova
`Madagascar
`The former Yugoslav
`Republic or Macedonia
`Mali
`Mongolia
`Mauritania
`Malawi
`Mexico
`Niger
`Netherlands
`Norway
`New Zealand
`Poland
`Ponugal
`Romania
`Russian Federal ion
`Sudan
`Sweden
`Singapore
`
`.;!,.
`")'
`
`Sl
`SK
`SN
`sz
`TD
`TG
`TJ
`TM
`TR
`TT
`UA
`UG
`us
`uz
`VN
`YU
`zw
`
`Slovenia
`Slovakia
`Senegal
`Swaziland
`Chad
`Togo
`Tajikistan
`Turl::menistan
`Turl::ey
`Trinidad and Tobago
`Ukraine
`Uganda
`United States or America
`Uzbekistan
`VietNam
`Yugoslavia
`Zimbabwe
`
`Page 14 of 666
`
`

`
`W000/25305
`
`PCT /CA 99/00990
`
`1
`
`HIGH FREQUENCY CONTENT RECOVERING METHOD AND
`
`DEVICE FOR OVER-SAMPLED SYNTHESIZED WIDEBAND SIGNAL
`
`5
`
`10
`
`BACKGROUND OF THE INVENTION
`
`1. Field of the invention:
`
`The present invention relates to a method and device for
`
`recovering a high frequency content of a wideband signal previously
`
`down-sampled, and for injecting this high fJ:equency content in an over(cid:173)
`
`sampled synthesized version of the down-sampled wideband signal to
`
`15
`
`produce a full-spectrum synthesized wideband signal.
`
`2. Brief description of the prior art:
`
`20
`
`The demand for efficient digital wideband speech/audio
`
`encoding techniques with a good subjective quality/bit rate trade-off is
`
`increasing
`
`for numerous applications
`
`such as audio/video ·
`
`teleconferencing, multimedia, and wireless applications, as well as
`
`Internet and packet network applications. Until recently, telephone
`
`25
`
`bandwidths filtered in the range 200-3400 Hz were mainly used in speech
`
`coding applications. However, there is an increasing demand for
`
`wideband speech applications in order to increase the intelligibility and
`
`Page 15 of 666
`
`

`
`W000/25305
`
`PCf/CA99/00990
`
`2
`
`naturalness of the speech signals. A bandwidth in the range 50-7000 Hz
`
`was found sufficient for delivering a face-to-face speech quality~ For
`
`audio signals, this range gives an acceptable audio quality, but still lower
`
`than the CD quality which operates on the range 20-20000 Hz·.
`
`5
`
`A speech encoder converts a speech signal into a digital
`
`bitstream which is transmitted over a communication channel (or stored
`
`in a storage medium). The speech signal is digitized (sampled and
`
`quantized with usually 16-bits per sample) and the speech encoder has
`
`the role of representing these digital samples with a smaller number of
`
`10
`
`bits while maintaining a good subjective speech quality. The speech
`
`decoder or synthesizer operates on the transmitted or stored bit stream
`
`and conv~rts it back to a sound signal.
`
`One of the best prior art techniques capable of achieving a
`
`15
`
`good quality/bit rate trade-off is the so-called Code Excited linear
`
`Prediction (CELP) technique. According to this technique, the sampled
`
`speech signal is processed in successive blocks of L samples usually
`
`called frames where L is some predetermined number (corresponding to
`
`10-30 ms of speech). In CELP, a linear prediction (LP) synthesis filter is
`
`20
`
`computed and transmitted every frame. The L-sample frame is then
`
`divided into smaller blocks called subframes of size of N samples, where
`
`L=kN and k is the number of subframes in a frame (N usually corresponds
`
`to 4-10 ms of speech). An excitation signal is determined in each
`
`subframe, which usually consists of two components: one from the past
`
`25
`
`excitation (also called pitch contribution or adaptive codebook) and the
`
`other from an innovative codebook (also called fixed codebook). This
`
`Page 16 of 666
`
`

`
`W000/25305
`
`PCT/CA99/00990
`
`3
`
`excitation signal is transmitted and used at the decoder as the input of the
`
`LP synthesis filter in order to obtain the synthesized speech.
`
`An innovative codebook in the CELP context, is an indexed set
`
`of N-sample-long sequences which will be referred to as N-dimensional
`
`5
`
`codevectors. Each codebook sequence is indexed by an integer k ·
`
`ranging from 1 to M where M represents the size of the codebook often
`
`expressed as a number of bits b, where M=2b.
`
`To synthesize speech according to the CELP technique, each
`
`1 0
`
`block of N samples is synthesized by filtering an appropriate codevector from
`
`a codebook through time varying filters modeling the spectral characteristics
`
`of the speech signal. At the encoder end, the synthesis output is computed
`
`for all, or a subset, of the codevectors from the codebook (codebook search).
`
`The retained codeveetor is the one producing the synthesis output closest
`
`15
`
`to the original speech signal according to a perceptually weighted distortion
`
`measure. This perceptual weighting is performed using a so-called
`
`perceptual weighting filter, which is usually derived from the LP synthesis
`
`filter.
`
`20
`
`The CELP model has been very successful in encoding
`
`telephone band sound signals, and several CELP-based standards exist in
`
`a wide range of applications, especially in digital cellular applications. In the
`
`telephone band, the sound signal is band-limited to 200-3400 Hz and
`
`sampled at 8000 samples/sec. In wideband speech/audio applications, the
`
`25
`
`sound signal is band-limited to 50-7000 Hz and sampled at 16000
`
`samples/sec.
`
`Page 17 of 666
`
`

`
`W000/25305
`
`PCT /CA 99/00990
`
`.,
`
`!
`
`4
`
`Some difficulties arise when applying the telephone-band
`
`optimized CELP model to wideband signals, and additional features need to
`
`be added to the model in order to obtain high quality wideband signals.
`
`Wideband signals exhibit a much wider dynamic range compared to
`
`telephone-band signals, which results in precision problems when a fixed-
`
`5
`
`point implementation of the algorithm is required (which is essential in
`
`wireless applications). Further, the CELP model will often spend most of its
`
`encoding bits on the low-frequency region, which usually has higher energy
`
`contents, resuHing in a low-pass output signal. To overcome this problem,
`
`the perceptual weighting filter has to be modified in order to suit wideband
`
`10
`
`signals, and pre-emphasis techniques which boost the high frequency
`
`regions beeome important to reduce the dynamic range, yielding a simpler
`
`fixed-point implementation, and to ensure a better encoding of the higher
`
`frequency contents of the signal. Further, the pitCh contents in the spectrum
`
`of voiced segments in wideband signals do not extend over the whole
`
`15
`
`spectrum range, and the amount of voicing shows more variation compared
`
`to narrow-band signals. Thus, it is important to improve the closed-loop pitch
`
`analysis to better accommodate the variations in the voicing level.
`
`Some difficulties arise when applying the telephone-band
`
`20
`
`optimized CELP model to wideband signals, and additional features need to
`
`be added to the model in order to obtain high quality wideband signals.
`
`As an example, in order to improve the coding efficiency and
`
`reduce the algorithmic complexity of the wideband encoding algorithm, the
`
`25
`
`input wideband signal is down-sampled from 16kHz to around 12.8 kHz.
`
`This reduces the number of samples in a frame, the processing time and the
`
`signal bandwidth below 7000 Hz to thereby enable reductign in bit rate down
`"Y
`
`I
`!
`
`Page 18 of 666
`
`

`
`W000/25305
`
`PCT/CA99/00990
`
`5
`
`to 12 kbitfs· while keeping very high quality decoded sound signal. The
`
`complexity is also reduced due to the lower number of samples per speech
`
`frame. At the decoder, the high frequency contents of the signal needs to
`
`be reintroduced to remove the low pass filtering effect from the decoded
`
`synthesized signal and retrieve the natural sounding quality of wideband
`
`5
`
`signals. For that purpose, an efficient technique for recovering the high
`
`frequency content of the wideband signal is needed to thereby produce a
`
`full-spectrum wideband synthesized signal, while maintaining a quality close
`
`to the original signal.
`
`10
`
`OBJECT OF THE INVENTION
`
`An object of the present invention is therefore to provide such an
`
`15
`
`efficient high frequency content ~ecovery technique.
`
`SUMMARY OF THE INVENTION
`
`20
`
`More specifically, in accordance with the present invention, there
`
`is provided a method for recovering a high frequency content of a wideband
`
`signal previously down-sampled and for injecting the high frequency content
`
`in an over-sampled synthesized version of the wide band signal to produce
`
`25
`
`a full-spectrum synthesized wideband signal. This high-frequency content
`
`recovering meth()d comprises: generating a noise sequence; spectrally(cid:173)
`
`shaping the noise sequence in relation to shaping parameterS representative
`,if.,
`"l'J
`
`Page 19 of 666
`
`

`
`wo 00125305
`
`I
`
`~
`
`PCT/CA99/00990
`
`6
`
`of the down-sampled wideband signal; and injecting the spectrally-shaped
`
`noise sequence in the over-sampled synthesized signal version to thereby
`
`produce the full-spectrum synthesized wideband signal.
`
`The present invention further relates to a device for recovering a
`
`5
`
`high frequency content of a wideband signal previously down-sampled and
`
`for injecting this high frequency content in an over-sampled synthesized
`
`version of the wideband signal to produce a full-spe