Daniel, I guess Eudora's HTML email messed up my message. Actually I was responding to Robert's question - saying that using alternate settings is a more efficient way of supporting multiple frequencies because it allows for better "conservation" of isoch. bandwidth! Thanks. Devendra. At 06:43 AM 5/20/2003, Dr Stefan Frank wrote: Hi Devendra, Your device has to support the "feature" change sampling frequency. So the class-specific isochronous audio data EP DSCR should have the bit.0 set in the bmAttirbutes. The systems sends a SET_FREQUENCY (there is also a GET_FREQUENCY, but I think it is not used att all). This command is a USB Audio Class requests. I hope this is what you search for. -daniel >-----Urspr=FCngliche Nachricht----- >Von: wdmaudiodev-bounce@xxxxxxxxxxxxx=20 >[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx[1]] Im Auftrag von=20 >BlazeAudio Developer >Gesendet: Montag, 19. Mai 2003 20:16 >An: wdmaudiodev@xxxxxxxxxxxxx >Betreff: [wdmaudiodev] Re: USBAudio sampling rate selection >=20 >=20 > At 05:13 AM 5/19/2003, Robert Gruner wrote: >=20 >But my Question is: How is the device told which sample rate=20 >to use? I have to know,=20 >because I need my ADCs to work with different master clock at=20 >different sampling rates.=20 >I think that's usually done by providing multiple alternate=20 >states on the interface for different sampling rates. And so,=20 >you get the rate "implicitly" by the alternate state that the=20 >host puts your interface in. Anf in the process the driver=20 >does not over-allocate the bandwidth. >=20 >Thanks. >Devendra.=20 >****************** >=20 >WDMAUDIODEV addresses: >Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx[2] >Subscribe: =20 >mailto:wdmaudiodev-request@xxxxxxxxxxxxx[3]?> subject=3Dsubscribe >=20 >Unsubscribe: =20 >mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=3Dunsubscribe[4] >Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx[5] >=20 >URL to WDMAUDIODEV page: >http://www.wdmaudiodev.de/[6] >=20 ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx[7] Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe[8] Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe[9] Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx[10] URL to WDMAUDIODEV page: http://www.wdmaudiodev.de/[11] --- Links --- 1 mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx 2 mailto:wdmaudiodev@xxxxxxxxxxxxx 3 mailto:wdmaudiodev-request@xxxxxxxxxxxxx 4 mailto:wdmaudiodev-request@xxxxxxxxxxxxx%3Fsubject=3Dunsubscribe 5 mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx 6 http://www.wdmaudiodev.de/ 7 mailto:wdmaudiodev@xxxxxxxxxxxxx 8 mailto:wdmaudiodev-request@xxxxxxxxxxxxx%3Fsubject=subscribe 9 mailto:wdmaudiodev-request@xxxxxxxxxxxxx%3Fsubject=unsubscribe 10 mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx 11 http://www.wdmaudiodev.de/ ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.de/
