Exhibit 31



CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

PURSUANT TO

RULES 13a-14, 13a-15, 15d-14 and 15d-15,

AS ADOPTED PURSUANT TO



SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002



I, Kirk B. Davis, certify that:



|1. |  | I have reviewed this quarterly report on Form 10-Q of Symphonix Devices, Inc.;
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|2. |  | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the
circumstances under which such statements were made, not misleading with respect to the period covered by this report;
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|3. |  | Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of
operations and cash flows of the registrant as of, and for, the periods presented in this report;
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|4. |  | The registrants other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15e
and 15d-15e) for the registrant and have:
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| | (a) |  | Designed such disclosure controls and procedures, or caused such disclosure and procedures to be designed under our supervision, to ensure that material information relating to the
registrant, including its consolidated subsidiaries, is made known to us by others within these entities, particularly during the period in which this report is being prepared;
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| | (b) |  | Evaluated the effectiveness of the registrants disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure
controls and procedures, as of the end of the period covered by this report based on such evaluation; and
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| | (c) |  | Disclosed in this report any change in the registrants internal control over financial reporting that occurred during the registrants most recent fiscal quarter that has
materially affected, or is reasonably likely to materially affect, the registrants internal control over financial reporting; and
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|5. |  | The registrants other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrants
auditors:
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| | (a) |  | All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonable likely to adversely affect the
registrants ability to record, process, summarize and report financial information; and
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| | (b) |  | Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant s internal control over financial reporting; and
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|6. |  | The registrants other certifying officers and I have indicated in this quarterly report whether or not there were significant changes in internal controls or in other factors
that could significantly affect internal controls subsequent to the date of our most recent evaluation, including any corrective actions with regard to significant deficiencies and material weaknesses.
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Date: August 14, 2003



By:

/s/ Kirk B. DavisName: Kirk B. Davis  Title: President and Chief Executive Officer




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I, Terence J. Griffin, certify that:



|1. |  | I have reviewed this quarterly report on Form 10-Q of Symphonix Devices, Inc.;
|-- |  | ------------------------------------------------------------------------------



|2. |  | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the
circumstances under which such statements were made, not misleading with respect to the period covered by this report;
|-- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|3. |  | Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of
operations and cash flows of the registrant as of, and for, the periods presented in this report;
|-- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|4. |  | The registrants other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15e
and 15d-15e) for the registrant and have:
|-- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (a) |  | Designed such disclosure controls and procedures, or caused such disclosure and procedures to be designed under our supervision, to ensure that material information relating to the
registrant, including its consolidated subsidiaries, is made known to us by others within these entities, particularly during the period in which this report is being prepared;
| | --- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (b) |  | Evaluated the effectiveness of the registrants disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure
controls and procedures, as of the end of the period covered by this report based on such evaluation; and
| | --- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (c) |  | Disclosed in this report any change in the registrants internal control over financial reporting that occurred during the registrants most recent fiscal quarter that has
materially affected, or is reasonably likely to materially affect, the registrants internal control over financial reporting; and
| | --- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|5. |  | The registrants other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrants
auditors:
|-- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (a) |  | All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonable likely to adversely affect the
registrants ability to record, process, summarize and report financial information; and
| | --- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (b) |  | Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant s internal control over financial reporting; and
| | --- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|6. |  | The registrants other certifying officers and I have indicated in this quarterly report whether or not there were significant changes in internal controls or in other factors
that could significantly affect internal controls subsequent to the date of our most recent evaluation, including any corrective actions with regard to significant deficiencies and material weaknesses.
|-- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



Date: August 14, 2003



By:

/s/ Terence J. GriffinName: Terence J. Griffin  Title: V.P.ofFinanceandChiefFinancialOfficer