Newsgroup: it.arti.musica.strumenti.chitarra
Titolo: Chitarra classica - accordatura

Chiedo scusa, probabilmente e' una domanda vecchissima ... ma io non lo so
fare. Se qualcuno ha tempo mi puo' rispondere. Come si accorda la chitarra
con gli armonici?
Grazie
Umberto

Gli armonici identici, utili per l'accordatura, sono quelli
al tasto 5 di una corda e al tasto 7 della corda sottostante.
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- ---7--- --- --- mi (armonico)
|--- --- --- --- ---5--- --- --- --- --- mi (armonico)
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- ---7--- --- --- la (armonico)
|--- --- --- --- ---5--- --- --- --- --- la (armonico)
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- ---7--- --- --- re (armonico)
|--- --- --- --- ---5--- --- --- --- --- re (armonico)
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- ---7--- --- --- re (armonico)
|--- --- --- --- ---5--- --- --- --- --- re (armonico)
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- ---7--- --- --- si (armonico)
|--- --- --- --- ---5--- --- --- --- --- si (armonico)
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
Come vedi, manca il caso delle corde 3 2 (sol si).
Infatti in questo caso l'intervallo è di terza
anzichè di quarta (come in tutti gli altri casi)
e allora gli armonici 5 e 7 non corrispondono più.
Un armonico quasi corrispondente al 5 della terza corda
(ma leggermente calante) lo puoi trovare quasi a metà del
tasto 3 della corda 5:
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- ---5--- --- --- --- --- sol (armonico)
|--- --- --- --- --- --- --- --- --- ---
|--- --- --3 --- --- --- --- --- --- --- sol (armonico calante)
|--- --- --- --- --- --- --- --- --- ---
Oppure puoi usare il sol (normale, non armonico)
che si ha sul tasto 3 della corda 1:
|--- --- -3- --- --- --- --- --- --- --- sol (NOTA NORMALE)
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- ---5--- --- --- --- --- sol (armonico)
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
Naturalmente il procedimento, così come te l'ho descritto,
non è perfetto, perché il salto della corda 3 impedisce
l'accordatura della corda 2, che dunque non può essere
presa come punto di riferimento per arrivare all'accordatura
della corda 1.
Dunque, per riepilogare meglio, il procedimento è questo.
----------------------------------------------------------------------
Prendi il diapason e accordi (all'unisono) il 5 tasto della corda 1:
                 ( )  diapason
                  |
|--- --- --- --- -5- --- --- --- --- --- la (NOTA NORMALE)
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
Poi procedi dal basso verso l'alto, in questo modo:
|--- --- --- --- --- --- ---7--- --- --- si (armonico)
|--- --- --- --- ---5--- --- --- --- --- si (armonico)
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- -3- --- --- --- --- --- --- --- sol (NOTA NORMALE)
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- ---5--- --- --- --- --- sol (armonico)
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- ---7--- --- --- re (armonico)
|--- --- --- --- ---5--- --- --- --- --- re (armonico)
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- ---7--- --- --- la (armonico)
|--- --- --- --- ---5--- --- --- --- --- la (armonico)
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- --- --- --- ---
|--- --- --- --- --- --- ---7--- --- --- mi (armonico)
|--- --- --- --- ---5--- --- --- --- --- mi (armonico)
Angelo Dinelli

|--- --- --- --- --- --- --- --- --- ---
Secondo te, conviene usare solo gli armonici o si possono usare insieme con
altri sistemi di accordatura?
Grazie. Ciao.
Umberto

Umberto Bottarel ha scritto nel messaggio ...
|l'accordatura del si non mi funziona, non so se per colpa mia o
|della mia chitarra.
Forse anche un po' per colpa tua, o della chitarra,
però gli armonici vengono decisamente meglio sulle
corde grosse, e diventano più difficili sulle corde sottili.
In questi casi devi proprio stare attento, e rilasciare
il dito della sinistra un'attimo dopo aver suonato con la destra,
altrimenti il polpastrello della sinistra smorza subito le
vibrazioni armoniche.
|Secondo te, conviene usare solo gli armonici o si possono usare insieme con
|altri sistemi di accordatura?
Secondo me si possono usare entrambi, o separatamente,
e in ogni caso nessuno dei due (anche eseguito perfettamente)
dà un'accordatura "buona".
Cioè l'accordatura è perfetta MA NON FUNZIONA.
Infatti quando noi premiamo le corde (durante l'esecuzione
di accordi o note singole) deformiamo le corde, le tiriamo,
e quindi le "innalziamo leggermente" di suono. I punti in cui sono
poste le asticelle sono punti matematici derivati precisamente in
base alla formula del semitono (1,06 circa), e si riferiscono
ai punti in cui le corde vanno "spezzate" per ottenere suoni
sempre più acuti. Però la corda reale che noi buttiamo giù,
a contatto con l'asticella che la "spezzerà", non è un entità
puramente matematica, ma fisica.
LA CORDA CHE PREMIAMO (SU UN'ASTICELLA) NON E' PIU'
LA STESSA CORDA LIBERA (OVVERO CON LA STESSA ELASTICITA')
MA RISULTA UNA CORDA LEGGERMENTE PIU' TIRATA (E PIU' ACUTA).
Da qui risulta che una chitarra PERFETTAMENTE ACCORDATA
(con l'accordatore elettronico o con qualsiasi altro sistema)
risulta poi "leggermente scordata" durante l'esecuzione di
certi accordi, dove ad esempio ci sono corde libere e corde
premute.
Cio' significa, in conclusione, che dopo aver fatto
l'accordatura (con qualsiasi sistema) conviene fare una
serie di accordi diversi, e cercare un' ACCORDATURA GLOBALE
che possa rendere accordati tutti questi diversi accordi.
Ciao.
Angelo Dinelli
|Grazie. Ciao.
|Umberto
|
|

...


ANGELO SEI UN GENIO. MA QUANDO TE LE STUDI TUTTO QUELLE COSE: TRA PARENTESI
SONO PIù CHE PERFETTE.
HAI UN CONSIGLIO DA DARMI PER UNA CHITARRA DA CIRCA 800.000 £. [ELETTRICA,
POSSIBILMENTE CON ALMENO UN HUNDBUCKER]
                ANDREA

Andrea ha scritto nel messaggio ...
|ANGELO SEI UN GENIO. MA QUANDO TE LE STUDI TUTTO QUELLE COSE: TRA PARENTESI
|SONO PIù CHE PERFETTE.
Se sono io quell'Angelo (Dinelli) ti ringrazio per i complimenti
e ti dico che le cose le prendo principalmente dai libri, anche
se spesso sono gli scambi di informazioni sui newsgroup che
danno molte informazioni.
Le ultime due lezioni sull'accordatura con gli armonici ne sono
una dimostrazione: una semplice osservazione di Maurizio Codogno
ha dato origine a due nuove lezioni, con due accordature cui non
avevo mai pensato, e che non avevo letto sui libri.
|HAI UN CONSIGLIO DA DARMI PER UNA CHITARRA DA CIRCA 800.000 £. [ELETTRICA,
|POSSIBILMENTE CON ALMENO UN HUNDBUCKER]
Vedi, ecco, ci siamo... mi hai beccato.
Tu credevi sapessi tutto e invece no.
Non capisco un ca-volo di chitarre elettriche.
Non ne ho mai avuta una (!!!).
Pauroso, non trovi ?!?!?
Però qui troverai ottimi intenditori di chitarre elettriche
con "hamburger" ^___^ , e i consigli fioccheranno ... a fiocchi.
Stammi bene.
Angelo