The noise is higher. The noise is not only narrow band spectral density number, it is an integral over audio band.
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Gotcha 🙂 Will do next time.
('ve been playing with Audacity this morning to see how it handled displaying channel separation spectrum on a preamp at 1 and 10kHz. Found a new toy 😀)
('ve been playing with Audacity this morning to see how it handled displaying channel separation spectrum on a preamp at 1 and 10kHz. Found a new toy 😀)
Looked at the circuit and it doesn't seem to have one. Certainly no inductive filter elements anywhere on the output. Its 1978 vintage, very "old school" but sounds fantastic.
Sony ST-515 / Tuners & Tube Tuners - Sony / Vintage Audio
Absolutely. No foobars and do-dahs, just 2N3055's and plenty of bias 😀 I was trying to think what amplifier it was used with back then. Pretty sure it was a Practical Wireless "Europa" with bizarre LTP input, one side was a darlington (BC109C's ) and the speakers were a three way Peerless design 10" bass, ?? mid and Audax ? soft dome tweeter.
Harmonic distortion of single tone is limiting case of underlying intermodulation mechanism. All sum and difference components are harmonics, or DC.
Correct simulation of distortion to broadband stimulus is much tougher to do and verify against distortion behavior in real systems.
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Windows is very naughty; I do all work with XP SP2.
My favorite sound card is E-MU 0404 USB. It has very good performance. Used with ASIO drivers, and software with support, behavior is bit perfect.
My favorite SW for signal generation and analysis is Cool Edit Pro, predating ASIO and has no support.
I can set E-MU clock to 44.1kHz and do loop measurements with Cool Edit, and always get corrupt results.
Output is perfectly well behaved; I capture output with Fostex FR2, and look at results of sound card output using 44.1kHz. FR2 may be set to 44.1kHz, 48kHz, 88.2kHz, etc., and results from E-MU analog output look great when FR2 files are analyzed.
Windows is butchering input from soundcard when it is set to 44.1kHz, but not for other sample rates. What gives? I hate conspiracy, paranoid, and irrational thinking; but it seems to me that Windows went out of the way to hinder early efforts to corrupt analog rip of CD content. This problem existed in Windows 95/NT and persists long after SW for extracting WAV directly from CD became wide spread. My 2 cents.
Correct simulation of distortion to broadband stimulus is much tougher to do and verify against distortion behavior in real systems.
.............
Windows is very naughty; I do all work with XP SP2.
My favorite sound card is E-MU 0404 USB. It has very good performance. Used with ASIO drivers, and software with support, behavior is bit perfect.
My favorite SW for signal generation and analysis is Cool Edit Pro, predating ASIO and has no support.
I can set E-MU clock to 44.1kHz and do loop measurements with Cool Edit, and always get corrupt results.
Output is perfectly well behaved; I capture output with Fostex FR2, and look at results of sound card output using 44.1kHz. FR2 may be set to 44.1kHz, 48kHz, 88.2kHz, etc., and results from E-MU analog output look great when FR2 files are analyzed.
Windows is butchering input from soundcard when it is set to 44.1kHz, but not for other sample rates. What gives? I hate conspiracy, paranoid, and irrational thinking; but it seems to me that Windows went out of the way to hinder early efforts to corrupt analog rip of CD content. This problem existed in Windows 95/NT and persists long after SW for extracting WAV directly from CD became wide spread. My 2 cents.
Me too. The displayed result is an external card problem. It has a crystal oscillator only for 48kHz multiples. For 44.1, it uses simple on-board sample rate converter. So it is much better to feed the card with 48/24 or 96/24.
My family had very similar pair matching SONY tuner and tape deck - maybe even the same ones. Don't remember the digital display on the tuner though. The rest seems familiar. Tape deck controls very familiar. Tuner we had had integrated amplifier I think. Remember it sounding perfectly OK but also remember being completely blown away by a demo of quad electrostatic speakers at the same time so it must have been pretty bad by comparison.
ASIO is a must for serious work on Windows. You can't rely on the usual audio systems (MME and DirectSound) not to mangle your signals.
ASIO is very useful; but not a must. Work must include verification of system performance. In case of Windows for my setup, recording at 44.1kHz is only issue without ASIO.
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