Exhibit 1

JOINT FILING AGREEMENT

The undersigned acknowledge and agree that the foregoing statement on Schedule 13D is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13D shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing statements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him, her or it contained herein, but shall not be responsible for the completeness and accuracy of the information concerning the other entities or persons, except to the extent that he, she or it knows or has reason to believe that such information is inaccurate.

Date: February 28, 2018.

DAGMAR DOLBY		MARITAL TRUST UNDER THE DOLBY FAMILY TRUST INSTRUMENT DATED MAY 7, 1999
By:	*	By:	*
	Dagmar Dolby		Name: Dagmar Dolby
			Title: Trustee
THOMAS E. DOLBY		DAGMAR DOLBY TRUST UNDER THE DOLBY FAMILY TRUST INSTRUMENT DATED MAY 7, 1999
By:	*	By:	*
	Thomas E. Dolby		Name: Dagmar Dolby
			Title: Trustee
DAVID E. DOLBY		RAY DOLBY 2002 TRUST A DATED APRIL 19, 2002
By:	*	By:	*
	David E. Dolby		Name: Dagmar Dolby
			Title: Trustee
DAGMAR DOLBY 2016 TRUST B DATED MARCH 23, 2016		RAY DOLBY 2002 TRUST B DATED APRIL 19, 2002
By:	*	By:	*
	Name: Dagmar Dolby		Name: Dagmar Dolby
	Title: Trustee		Title: Trustee
DAGMAR DOLBY 2016 TRUST BB DATED MARCH 23, 2016		DOLBY HOLDINGS II LLC
By:	*	By:	*
	Name: Dagmar Dolby		Name: Dagmar Dolby
	Title: Trustee		Title: Manager
DAGMAR DOLBY 2017 TRUST BB DATED MAY 25, 2017
By:	*
	Name: Dagmar Dolby
	Title: Trustee
		*By:	/s/ Patrick McCabe
			Patrick McCabe, on behalf of Shartsis Friese LLP,
			as Attorney-in-Fact