PATENT CLAIM ANALYSIS

Application Number: 16026116
Application Type: Utility
Filing Date: 2018-07
Publication Date: 2019-01
Patent Classification: ["330", "303000"]

Abstract:
A digital amplifier includes a digital PWM generator, a first amplifier circuit, a first low-pass filter, a second amplifier circuit, a second low-pass filter, an attenuator, an error extractor, an adder, and a voltage supply unit. The first amplifier circuit amplifies a digital PWM signal at a second voltage. The first low-pass filter extracts a low-frequency band voltage signal from the amplified digital PWM signal, and outputs the extracted voltage signal to a load. The second amplifier circuit amplifies the generated digital PWM signal at a third voltage. The error extractor extracts an error signal. The adder adds a digital error signal whose feedback gain is adjusted to a digital audio signal. The voltage supply unit generates the third voltage that has a voltage value of a predetermined ratio to a voltage value of the second voltage, and supplies the third voltage to the second amplifier circuit.

Claim (Index 1):
A digital amplifier comprising:\n a digital pulse width modulation (PWM) generator that generates a digital PWM signal corresponding to a digital audio signal by using a first voltage; a first amplifier circuit that amplifies the digital PWM signal at a second voltage whose absolute value is larger than an absolute value of the first voltage; a first low-pass filter that extracts low-frequency components, as a first analog voltage signal, from a first amplified digital PWM signal amplified by the first amplifier circuit, and outputs the low-frequency components to a load; a second amplifier circuit that amplifies the digital PWM signal at a third voltage whose absolute value is smaller than the absolute value of the second voltage; a second low-pass filter that extracts low-frequency components, as a second analog voltage signal, from a second amplified digital PWM signal amplified by the second amplifier circuit; a first attenuator that attenuates the first analog voltage signal extracted by the first low-pass filter to generate a first attenuated analog voltage signal; an error extractor that extracts an error signal based on the second analog voltage signal extracted by the second low-pass filter and the first attenuated analog voltage signal generated by the first attenuator; a digital error signal generator that generates, from the error signal, a digital error signal whose feedback gain is adjusted, the digital error signal being generated by digitizing the error signal; an adder that adds the digital error signal to the digital audio signal; and a voltage supply unit that generates the third voltage that has a voltage value of a predetermined ratio to a voltage value of the second voltage by using the second voltage, and supplies the third voltage to at least the second amplifier circuit.

Metadata:
- Claim Count in Document: 7.0
- Percentile: 95.0
- Lexical Diversity: 3.03704
- Patent Class: 330.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['13824458', '13169558', '11115696', '13634632', '14830183']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7554889574488217
- 35 USC 102 Novelty (BERT): 0.5070259267744578
- Combined Prediction Score: 0.7306426543813854
- Mean Citation Score: 237.470108
- Max Citation Score: 251.75491
- Similarity Product: 185.4300122628892

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test