Togliere anti bump su Sonic Impact

Ciao a tutti, sto cercando il tweaking per togliere l'anti bump dal Sonic Impact. Ho provato a cercare su questa parte del forum ma non ho trovato questo argomento, magari ho cercato male...

Grazie a tutti per l'aiuto

Ziocalepino

http://www.datasheetcatalog.org/datasheet/Tripath/mXyzxwwt.pdf

Se non erro, è una funzione embedded nel chip: nei pin dell'integrato non ne "leggo" alcuno ricollegabile ad essa. per cui non penso che ci si possa fare nulla .

Se ho sbagliato, correggetemi pure .



P.s.: ma perché lo vuoi togliere ? I vantaggi sono evidenti ... quali problemi ti porta ?

ziocalepino ha scritto:Ciao a tutti, sto cercando il tweaking per togliere l'anti bump dal Sonic Impact. Ho provato a cercare su questa parte del forum ma non ho trovato questo argomento, magari ho cercato male...

Grazie a tutti per l'aiuto

Ziocalepino

Riporto pari-pari dal datasheet del TA2024. Spero ti sia utile



Turn-on and Turn-off Noise

The TA20204C has improved mute-off and mute-on click performance as compared to previous
Tripath devices including TA2024 and TA2024B. The main improvement was related to keeping
the input stage biased up during mute, but other specific circuit details, beyond the scope of the
data sheet, were also improved.

But as with the previous devices, many complaints about turn on and off clicks were not actually
caused by the TA2024C. As noted above, a typical cause of turn off pop is related to the audio
processor that provides the audio input to the TA2024C amplifier. The audio processor used for
most LCD TV’s produces a pop when its power supply collapses. Thus, it is recommended that
the TA2024C mute pin is pulled high before the power supply is removed.

The time that it takes to activate mute has been reduced in the TA2024C as opposed to TA2024
and TA2024B. This allows for the mute to be activated before the audio processor power supply
can collapse. Thus, any possibility of a pop being amplified by the TA2024C can be adverted.

The remaining source of click is the residual output offset. This pop would normally be masked if
the TA2024C is playing music but in some cases, may be undesirable due to application
requirements. The level of the pop is proportional to the offset, which has a specified maximum
of 150mV as stated in the Electrical Characteristics Section.

In most cases, the pop caused by the output offset is not objectionable. But in those cases that
there is concern about the residual pop, the offset can be nulled. There are several ways to trim
the offset. These include using a trim pot, with current limiting resistor, using an active DC servo
comprised of op-amps, resistors and switches, and finally, a look-up table of resistor values
attached to the input. The last scheme is implemented on the EB-TA2024C. Please refer to the
EB-TA2024C document at www.tripath.com for additional information on this circuit.

Please note that while a DC servo is automatic, and thus, does not require manual adjustment, it
is not the best solution. This is because the DC servo has to be slow enough so as not to react to
low frequency audio signals. Thus, it is not possible for such a circuit to eliminate a mute off pop
caused by DC offset. The servo is effective for eliminating mute on pops, since the DC offset
would be nulled to zero by the time the TA2024C is muted. A DC servo, in conjunction, with a
relay is an effective method for completely eliminating mute off and mute on pops, but due to the
small residual pop caused by the TA2024C offset, it is unlikely that such a sophisticated scheme
would be implemented for high-volume production designs.

Un mio amico anni fa l' ha fatto sul suo ma non si ricorda come, per cui persumo che non sia una funzione nativa nel chip... intanto grazie leggerò con calma quanto inviato!

Preciso che si tratta del t-amp originale, quello di plastica arrotondato da pochi euro.