Speaker apparatus
AssigneeSony Corporation
InventorsJun Kishigami, Masao Fujihira, Takahiro Muraguchi
Life of this patent
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Abstract
A speaker apparatus which drives an electromagnetic-coupling-type speaker in accordance with a digital signal is provided with a speaker unit, and a plurality of amplifiers corresponding to the number of quantization bits of a digital audio signal. The output terminals of the amplifiers are connected to the respective primary coils, respectively, and the output impedances of the plurality of the amplifiers are made equal to those of the respective primary coils to which the amplifiers are connected. Each bit of each sample of the digital audio signal is amplified by the plurality of the amplifiers and supplied to the respective primary coils, respectively.
Claims2
A speaker apparatus, comprising:
- a speaker unit;
- and
- a plurality of n amplifiers, where n is a whole number corresponding to a number of quantization bits of a digital audio signal,
- wherein said speaker unit is formed into an electromagnetic-coupling-type speaker such that a gap is formed in a magnetic circuit, n primary coils are fixed to a portion of said speaker unit proximate to said gap, a secondary coil is disposed within said gap and fixed to a cone, an electric current is induced in said secondary coil by an electric current which flows through said n primary coils, causing said cone to vibrate,
- a plurality of output terminals of said n amplifiers are connected to said n primary coils, respectively,
- output impedances of said n amplifiers are equal to impedances of said primary coils to which the amplifiers are connected, and
- each bit of each sample of said digital audio signal is amplified by said amplifiers and supplied to said primary coils, respectively.
Dependencies are inferred from the claim text.