[time-nuts] TV frequency control

2007-10-08 Thread Murray Greenman
Hi, Jose's correct. Co-channel TV stations are accurately offset by a fraction of the line frequency. Interestingly enough (and for this reason) independent TV stations often have very accurate transmitter frequencies, while potentially having quite poor (1e-6 or so) control of the picture

[time-nuts] Re TV sync

2007-10-08 Thread Paul Galpin
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Ah-ha! Satellite broadcasters have poor stability - not necessarily so. Many years ago (about 1978, actually) we were sending a signal from Johannesburg to UK by satellite. In our control room, we could see both the signal

Re: [time-nuts] from Sputnik to CD

2007-10-08 Thread David McGaw
As one who has worked in the pro digital audio field for years, I can tell you that sub-100 ps jitter very definitely can be heard, depending on its spectrum. Modern sigma-delta ADCs and DACs use oversampling clocks of 12 to 50 MHz for sample rates of 44.1 kHz to 192 kHz at 24-bit resolution

Re: [time-nuts] from Sputnik to CD

2007-10-08 Thread Henk ten Pierick
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY On Oct 8, 2007, at 20:04, David McGaw wrote: ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY As one who has worked in the pro digital audio field for years, I can tell you that sub-100 ps jitter

Re: [time-nuts] from Sputnik to CD

2007-10-08 Thread Tom Van Baak
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY As one who has worked in the pro digital audio field for years, I can tell you that sub-100 ps jitter very definitely can be heard, depending on its spectrum. Modern sigma-delta ADCs and DACs use oversampling clocks of

Re: [time-nuts] from Sputnik to CD

2007-10-08 Thread Poul-Henning Kamp
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY In message [EMAIL PROTECTED], Tom Van Baak writes: It's also interesting when two list members disagree by so many tens of dB, so I'm hoping David and PHK can settle this for us. I doubt it, at the end of the day, much of

Re: [time-nuts] from Sputnik to CD

2007-10-08 Thread Bruce Griffiths
Tom Van Baak wrote: As one who has worked in the pro digital audio field for years, I can tell you that sub-100 ps jitter very definitely can be heard, depending on its spectrum. Modern sigma-delta ADCs and DACs use oversampling clocks of 12 to 50 MHz for sample rates of 44.1 kHz to 192

Re: [time-nuts] from Sputnik to CD

2007-10-08 Thread Magnus Danielson
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY From: Poul-Henning Kamp [EMAIL PROTECTED] Subject: Re: [time-nuts] from Sputnik to CD Date: Mon, 08 Oct 2007 21:02:24 + Message-ID: [EMAIL PROTECTED] ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY

Re: [time-nuts] from Sputnik to CD

2007-10-08 Thread Bill Hawkins
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Bruce, You have been more precise than this in other posts. Can you put some numbers behind the sigma delta DAC's sensitivity to jitter? Twenty years ago, the process control community got all jittery about the jitter in the

[time-nuts] TV Frequency control - slightly O/T.

2007-10-08 Thread Kit Scally
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Just noting a few points made recently on this topic. Do not confuse the Studio colour subcarrier frequency (4.43 or 3.58 MHz) accuracy - or the digital equivalent clock frequency - with the TV transmitters carrier frequency

Re: [time-nuts] from Sputnik to CD

2007-10-08 Thread Bruce Griffiths
Bill Hawkins wrote: Bruce, You have been more precise than this in other posts. Can you put some numbers behind the sigma delta DAC's sensitivity to jitter? Twenty years ago, the process control community got all jittery about the jitter in the execution period of function blocks. The

Re: [time-nuts] TV Frequency control - slightly O/T.

2007-10-08 Thread Magnus Danielson
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY From: Kit Scally [EMAIL PROTECTED] Subject: [time-nuts] TV Frequency control - slightly O/T. Date: Tue, 9 Oct 2007 09:28:55 +1000 Message-ID: [EMAIL PROTECTED] ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED]