Amplifier and amplifying method

{
  "publication_number": "US2013163789A1",
  "country": "US",
  "kind": "A1",
  "title": "Amplifier and amplifying method",
  "abstract": "An amplifier that modulates a carrier frequency according to a digital signal and amplifies the modulated signal includes a determining portion that determines at least one of a sound quality required for the digital signal, a sound source of the digital signal, and a type of sound of the digital signal, a carrier frequency setting portion that sets a carrier frequency according to a result of the determination, and a pulse-width modulating portion that pulse-width modulates the carrier frequency according to the digital signal.",
  "claims": [
    "1. An amplifier that modulates a carrier frequency according to a digital signal and amplifies the modulated signal, comprising: a determining portion that determines at least one of a sound quality required for the digital signal, a sound source of the digital signal, and a type of sound of the digital signal; a carrier frequency setting portion that sets a carrier frequency according to a result of the determination by the determining portion; a pulse-width modulating portion that pulse-width modulates the carrier frequency set by the carrier frequency setting portion, according to the digital signal; a switching power setting portion that sets a switching power to be used when amplifying the carrier frequency modulated by the pulse-width modulating portion, according to the result of the determination by the determining portion; and a switching portion that amplifies the carrier frequency modulated by the pulse-width modulating portion, according to the switching power set by the switching power setting portion. 2. The amplifier according to claim 1, further comprising: an input signal determining portion that determines whether the digital signal is being input, wherein the carrier frequency setting portion sets the carrier frequency to a low frequency or stops oscillation, when it is determined by the input signal determining portion that the digital signal is not being input. 3. (canceled) 4. An amplifier that modulates a carrier frequency according to a digital signal and amplifies the modulated signal, comprising: an input signal determining portion that determines whether the digital signal is being input; a determining portion that determines at least one of a sound quality required for the digital signal, a sound source of the digital signal, and a type of sound of the digital signal; a carrier frequency setting portion that sets a carrier frequency according to a result of the determination by the determining portion; and a plurality of pulse-width modulating portions that pulse-width modulate the carrier frequency set by the carrier frequency setting portion, according to the digital signal, wherein the carrier frequency setting portion sets a carrier frequency corresponding to each of the plurality of pulse-width modulating portions. 5. The amplifier according to claim 4, wherein the carrier frequency setting portion sets the carrier frequency corresponding to a pulse-width modulating portion that corresponds to the digital signal, from among the plurality of pulse-width modulating portions, to a low frequency or stops oscillation. 6. A method by which an amplifier modulates a carrier frequency according to a digital signal and amplifies the modulated signal, comprising: determining at least one of a sound quality required for the digital signal, a sound source of the digital signal, and a type of sound of the digital signal; setting a carrier frequency according to a result of the determination; pulse-width modulating the set carrier frequency according to the digital signal; setting a switching power to be used when amplifying the modulated carrier frequency, according to the result of the determination; and amplifying the modulated carrier frequency, according to the set switching power. 7. A method by which an amplifier modulates a carrier frequency according to a digital signal and amplifies the modulated signal, comprising: determining whether the digital signal is being input; determining at least one of a sound quality required for the digital signal, a sound source of the digital signal, and a type of sound of the digital signal; setting a carrier frequency according to a result of the determination; and pulse-width modulating the set carrier frequency according to the digital signal, by a corresponding pulse-width modulating portion, from among a plurality of pulse-width modulating portions that pulse-width modulate the carrier frequency according to the digital signal, wherein in setting the carrier frequency, a carrier frequency corresponding to each of the plurality of pulse-width modulating portions is set."
  ],
  "cpc": [
    "H03F 3/217",
    "H03F 3/68"
  ],
  "assignees": [
    "MAENO SEIGEN",
    "TOMONAGA HIROSHI"
  ],
  "filing_date": "2011-09-05",
  "publication_date": "2013-06-27",
  "priority_date": "2010-09-06",
  "application_number": "US-201113819810-A",
  "family_id": "44947129",
  "citations": [
    "US2002131611A1",
    "US2007242777A1"
  ]
}