Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of our report dated December 3, 2004 relating to the financial statements and financial statement schedule of OYO Geospace Corporation, which appears in OYO Geospace Corporation’s Annual Report on Form 10-K for the year ended September 30, 2004.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

Houston, Texas

February 11, 2005