US 12,445,094 B2
Amplifier connected with a plurality of speakers
Toshiyuki Ochi, Shizuoka (JP); and Mitsuo Shida, Shizuoka (JP)
Assigned to Roland Corporation, Shizuoka (JP)
Filed by Roland Corporation, Shizuoka (JP)
Filed on Apr. 27, 2023, as Appl. No. 18/307,800.
Claims priority of application No. 2022-187235 (JP), filed on Nov. 24, 2022.
Prior Publication US 2024/0178799 A1, May 30, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H03F 3/183 (2006.01); H03F 1/32 (2006.01); H03F 3/181 (2006.01); H04R 3/00 (2006.01); H04R 29/00 (2006.01)
CPC H03F 3/183 (2013.01) [H03F 1/327 (2013.01); H03F 3/181 (2013.01); H04R 3/002 (2013.01); H04R 29/001 (2013.01); H03F 2200/03 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An amplifier, comprising an amplification section comprising an operation amplifier amplifying a musical tone signal input from an electric musical instrument, the amplifier being connected with a plurality of speakers, the amplifier comprising:
a selection section comprising an output destination switch selecting a speaker for outputting the musical tone signal amplified by the amplification section, among the plurality of speakers;
a storage section comprising a memory storing a characteristic adjustment value which is a value for adjusting an output impedance characteristic or an input impedance characteristic of the amplifier according to a characteristic of the speaker for each of the plurality of speakers;
an acquisition section comprising a processor acquiring the characteristic adjustment value corresponding to the speaker selected by the selection section from the characteristic adjustment values stored in the storage section; and
a characteristic adjustment section comprising a damping factor adjusting the output impedance characteristic or the input impedance characteristic based on the characteristic adjustment value acquired by the acquisition section.