Contract

EXHIBIT 10.21

G. (Gord) Xxxxxx

Senior Account Manager

Knowledge Based Industries

Tel; (000) 000-0000

Fax: (000) 000-0000

Email: xxxx.xxxxxx@xxx.xxx

June 20, 2003

Private and Confidential

Spectrum Signal Processing Inc.
#200 - 0000 Xxxxxxxxxx Xxx

Burnaby, B.C.

V5A 4X1

Attention: Xx. Xxxxx Xxxxxxx

Dear Sirs:

Re:  Spectrum Signal Processing Inc. (the "Borrower") Credit Facilities with Royal Bank of Canada (the "Bank")

Further to our recent discussions on the subject, we are pleased to confirm the following amendments to your Credit Facility outlined in our letter to you of April 24, 2003.

CREDIT FACILITIES

Xxxxxxx as follows;

Letters of Credit and Letters of Guarantee to be available in US currency.

Note:

LCs & LGs combined maximum limit has been temporarily increased from $500,000 to $1,000,000, expiring October 30, 2003.

Except as specifically amended above, all terms and conditions outlined in the Credit Agreement dated April 28, 2003, continue to apply, unamended.

Please provide your acceptance of this Amending Letter by signing and returning the attached copy to the Bank by July 18, 2003 after which date the within offer is null and void, unless extended in writing by the Bank.

Yours truly,

/S/ X.X. Xxxxxx

Senior Account Manager

We acknowledge and accept the foregoing terms and conditions of this Amending Letter June 30 , 2003.

SPECTRUM SIGNAL PROCESSING INC.

By: /S/ XXXXX XXXXXXX

Name: Xxxxx Xxxxxxx
Title: Vice President of Finance and Chief Financial Officer

By: /S/ XXXXXX XXXXXXXXXX

Name: Xxxxxx Xxxxxxxxxx
Title: President and Chief Executive Officer

I/We have authority to bind the corporation.

We acknowledge and confirm our agreement with the foregoing terms and conditions, as Guarantor, as of June 30, 2003.

SPECTRUM SIGNAL PROCESSING (USA) INC.

By:

     /S/ XXXXX XXXXXX

Name: Xxxxx Xxxxxx

Title: Vice President and General Manager

I/We have authority to bind the corporation.

We acknowledge and confirm our agreement with the foregoing terms and conditions, as Guarantor, as of June 30, 2003.

SPECTRUM SIGNAL PROCESSING (UK) LIMITED

By: /S/ XXXXX XXXXXXX

Name: Xxxxx Xxxxxxx

Title: Director

By: /S/ XXXXXX XXXXXXXXXX

Name: Xxxxxx Xxxxxxxxxx

Title: Director

I/We have authority to bind the corporation.