Fundamental concepts and terminologies around the idea of TIME. I have already written a note on my social pages and on my Blog, on some concepts concerning time and the Synchronization of Signals. I add this article (©SynAudCon), originally produced by Dion Davis, on some concepts concerning the definitions of Time, Phase, Polarity, Group Delay, … Leggi tutto “Definition of Terms or What is Time?” by Don Davis
Riprendo questa nota che scrissi sulla mia pagina Facebook nell'Ottobre del 2015. La teoria vuole il subwoofer, ovvero il protagonista della nostra storia, una sorgente omnidirezionale. Il range operativo di un subwoofer generalmente varia dai 25 Hz ai 125 Hz (o giù di li). Parliamo di un range operativo di frequenze che abbraccia lunghezze d'onda … Leggi tutto Sull’utilità dell’appendimento dei subwoofers, della direttività in bassa frequenza e di Jovanotti…
Meyer Sound e le menti che in essa ed intorno ad essa lavorano, hanno fatto la storia delle moderne tecniche per il disegno e tuning dei sistemi di rinforzo sonoro. La continua lotta tra teoria, softwares e realtà, è il tema portante di questo blog come ho più volte precisato e Meyer Sound è, a … Leggi tutto Del MAPP XT tra Softwares e Realtà; dell’importanza dei “preliminari” (VERIFICA) e di alcune storie di MSL-4…
"Scendiamo dunque e confondiamo la loro lingua, perché non comprendano più l'uno la lingua dell'altro" (Gen. 11, 1-9) (Episodio della confusione delle lingue - Torre di Babele) In questi ultimi 15 anni si è assistito ad un vero e proprio exploit dell' interesse verso l’uso di configurazioni di subwoofers cosidette “cardiodi”. Non c’è un concerto, … Leggi tutto Per una corretta e condivisa nomenclatura degli arrays direttivi di subwoofers
Da alcuni anni sì è diffusa nel mondo degli utilizzatori di alcuni grandi marchi di audio professionale, uno strano fenomeno. E' facile rendersi conto che siamo di fronte ad un altro esempio di scollamento tra realtà e manuali. Sui manuali di questi marchi, a titolo meramente esemplificativo, sono illustrate delle configurazioni di subwoofers denominate genericamente … Leggi tutto Delle configurazioni “cardioidi” asimmetriche di subwoofers, dei manuali, dei sotwares e del senso critico
I highly recommend reading the previous articles in which I illustrated the Hopkins-Stryker formulas. Remembering this formula, to modify LD it is necessary to modify two fundamental variables: LW (sound power level) and Q (Directivity Factor). When to change one or the other? Let's start with the two extreme cases. If delta dB = 0 … Leggi tutto Will I change Q or Lw to control LD?
Acoustic measurements are but one way to evaluate the dissipation of energy in an enclosed space. An example from everyday life is in order. We shall consider something that everyone reading this will have in common, your body weight. How can you tell if it is increasing or decreasing? There are several possibilities, but the … Leggi tutto Can meters tell you what something sounds like?
Heyser, among other things, was the inventor of Time Delay Spectrometry. He was one of the most profitable and revolutionary scientists of the last century. Heyser has taught courses for SynAudCon, a world leader in professional audio engineering and acoustics training since the 1960s. The contents of the courses were of the highest level and … Leggi tutto What could you learn in a course with Richard Heyser in 1979?
Signal Synchronization Signal Synchronization is achieved when two identical sources covering the same frequency range and listening area add to measurable +6dB (in the case of correlate signals) Time Align“Time Align” is a trademark term owned by Ed Long and is applied to sytems where transducers covering different frequency ranges are to be brought into … Leggi tutto A bit of definitions
I present this article, which I personally liked a lot, by Pat Brown, president of SynAudCon. This is one of the most-often asked questions that we get at seminars. Since our answer is always the same, I thought that it might be useful to share it in print.The audio industry is fortunate to have a … Leggi tutto “Software SIZE-UP” by Pat Brown
FREE FIELD Uniform, free of boundaries, undisturbed by other sound sources. The effects of the boundaries are negligible over the region of interest.The fiow of sound energy is in one direction only. Anechoic chambers and well-above-the-ground outdoors are free-fields examples. DIFFUSE FIELDA diffuse or reverberant sound field is one in which the time average of … Leggi tutto Sound Fields
Quoting from AES Preprint # 962 (N-5) by Henning Moller, "Phase Response of Loudspeakers -- Measured with Phase Meter and Digital Delay Line"MINIMUM AND NON-MINIMUM PHASE - In electrical svstems, there will normally be a well defined relationship between the amplitude and phase reponses - so that if we know the amplitude reSDonse it is, … Leggi tutto Minimum or Non-Minimum this is the question
This is an old interesting article of SynAudCon from 1982). When we are asked about sound reinforcement of choirs, soloists and instrumental groups in church environments, we normally discourage such systems. We encourage choir "shells," proper structure geometry, voice projection training, etc., as more likely to result in long term musical satisfaction for the largest … Leggi tutto THE PROS AND CONS OF REINFORCING OF MUSICAL GROUPS IN CHURCH ENVIRONMENTS
