It also pretty much excludes it sounding like a piano. Pianos, being large, are a bit like directional radio antennas: the full effect cannot be appreciated at too close a range.jan.didden said:
Exactly. And the stereo speakers in your room are not going to re-create that soundfield exactly. However, with a fully 'complementary' recording/synthesis and playback setup, I'm pretty sure that the illusion of a piano playing in your living room can be achieved. A piano playing in another specific room or hall, maybe not.
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At my 44's, I still can hear the horizontal in old TV sets, not the 15625Hz directly, but the random noise generated while not on sync.
Most TV sets when running out of sync drop the line frequency dramatically, like to 12kHz. That drop is often enough to make it (much) better audible.
jan
In the USA, the free running frequency is supposed to be 15,750Hz which is close enough to 15625 to insure rapid lock when sync is detected. (See RC30 Section 29-27). The local oscillator was typically a simple cross coupled multivibrator (two triodes).
No so simple. The synchroguide circuit was very complex for that era, although a simple 6SN7 did the job, the circuit was very complex. A word for the older ones in which the oscillator and discharge was separate stages. I could see a 6V6 as horizontal oscillator (Not directly I saw, but in 50's manuals).
Inspired in those circuits, I did a strange design which is actually under development, but is working pretty fine.
Inspired in those circuits, I did a strange design which is actually under development, but is working pretty fine.
Doesn't flywheel sync in modern (i.e. post 1960-ish) sets require the unlocked frequency to be about the same as the locked frequency? It is essentially a crude PLL. Surely direct injection locking of a multivibrator hasn't been used for decades, at least for line sync?
Synch pulses must be of higher frequency than the stand alone (natural) frequency of the oscillator to be synch'ed. If not, the oscillator will be synch'ed at a 1/2 the frequency, as pulses appears between two oscillator cycles.
The multivibrator oscillator and the sychroguide has a resonant tank in them to help improve stability.
I believe that actual PLL's are a evolution from those DC "tuned" square wave oscillators. I used this idea in my design.
The multivibrator oscillator and the sychroguide has a resonant tank in them to help improve stability.
I believe that actual PLL's are a evolution from those DC "tuned" square wave oscillators. I used this idea in my design.
Flywheel sync does not work like that. The oscillator (VCO) just sees a control voltage coming from a phase detector.
Horizontal sync is via a VCO, vertical uses direct sync as the integrates clears high frequency pulses; although I believe Philips has made a model (in the tube era) with VCO at the vertical sync, if I remember well.
Golden Ears - both a blessing and a curse
Golden Ears - both a blessing and a curse:
A blessing because it is easy to listen to differences and to setup and tweak a audio setup to perfection, and specially when all other noises than the the intended audio have been eliminated.
A curse because sound emitting from SSD drives, RAM modules, transformers, power supplies light bulbes etc., are disturbing, even the pickup needle when playing LPs are emitting sound that are easily heard even playing at 100dB SPL peaks.
Golden Ears - both a blessing and a curse:
A blessing because it is easy to listen to differences and to setup and tweak a audio setup to perfection, and specially when all other noises than the the intended audio have been eliminated.
A curse because sound emitting from SSD drives, RAM modules, transformers, power supplies light bulbes etc., are disturbing, even the pickup needle when playing LPs are emitting sound that are easily heard even playing at 100dB SPL peaks.
Dangerous thing to do, Ray, reviving this thread ... 😉
I believe just about everyone has Golden Ears, it's really about the type of focus being used at the time of "trying to hear something ..." - it's the listening when not 'listening' that counts ...
I believe just about everyone has Golden Ears, it's really about the type of focus being used at the time of "trying to hear something ..." - it's the listening when not 'listening' that counts ...
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My Dad was tone deaf - I couldn't convince him that my stereo was better than his £50 cheapie.
I think if you've got golden ears then enjoy your music, if not then still enjoy your music.
I think if you've got golden ears then enjoy your music, if not then still enjoy your music.
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