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Audio power amplifier ic and audio system equipped therewith

An audio power and amplifier technology, applied in audio amplifiers, low frequency amplifiers, amplifiers, etc., can solve problems such as drop

Inactive Publication Date: 2007-08-22
ROHM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in an audio power amplifier IC having a digital power amplifier circuit, power supply noise and radiation noise of higher harmonics are generated due to switching based on pulse output synchronized with a reference clock
[0011] The inventors of the present application focused on the following fact in an audio system using a plurality of audio power amplifier ICs as described above. Therefore, the frequency difference between the power supply noise and the radiation noise generated from each audio power amplifier IC produces the sound in the audible frequency band, that is, the beat sound, and the sound quality in the audio system will deteriorate. Happening

Method used

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  • Audio power amplifier ic and audio system equipped therewith
  • Audio power amplifier ic and audio system equipped therewith

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Embodiment Construction

[0021] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0022] FIG. 1 is a block diagram showing a plurality of audio power amplifier ICs and the configuration of an audio system including these audio power amplifier ICs according to an embodiment of the present invention. First, the audio power amplifier IC1 will be explained, and then the structure of the audio system will be explained.

[0023] The audio power amplifier IC1 includes: an audio signal input terminal (first audio signal input terminal) IN1, an audio signal input terminal (second audio signal input terminal) IN2, a pulse output terminal (first pulse output terminal) OUT1, and a pulse output terminal ( Second pulse output terminal) OUT2, clock terminal CLK, control terminal CNT, digital power amplifier circuit (first digital power amplifier circuit) 51 and 52 (second digital power amplifier circuit), clock generation circuit 10, clock selection circuit 11, An...

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Abstract

An audio power amplifier IC, which can suppress audio quality deterioration due to reference clock frequency, and an audio system provided with the audio power amplifier IC. The audio power amplifier IC is provided with a clock generating circuit (10) for generating an internal clock; a clock terminal (CLK) for performing internal clock output or external clock input; a clock selecting circuit (11) which selects either the internal clock or the external clock as the reference clock (BCLK); a first audio signal input terminal (IN1) to which a first audio signal (Lin) is inputted; and a first digital power amplifier circuit (51) which outputs a pulse synchronized with the reference clock (BCLK) by performing pulse modulation to the first audio signal (Lin) based on the reference clock (BCLK).

Description

technical field [0001] The present invention relates to an audio power amplifier IC (Integrated Circuit) of a digital power amplifier circuit that performs pulse modulation (PWM (PulseWidth Modulation)) and pulse density modulation (PDM (Pulse Duration Modulation)) on an input audio signal and outputs it And an audio system equipped with this audio power amplifier IC. Background technique [0002] In recent years, in order to increase the sound effect, such as two-way stereo system (way stereo system) and home theater system, in addition to two speakers (hereinafter, also referred to as left and right speakers) that respectively output left and right stereo sound, additional speakers are added. An audio system such as a speaker that outputs a sound that emphasizes only the bass. In order to output audio (sound) signals to a plurality of speakers in such an audio system, a plurality of power amplifier circuits corresponding to the respective speakers are required. As such a...

Claims

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Application Information

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IPC IPC(8): H03F3/217H03F3/68H03F3/183
CPCH03F2200/345H03F3/187H03F3/217H03F2200/249H03F3/68H03F2200/351H03F2200/03
Inventor 小滨重二大石智之相马正继
Owner ROHM CO LTD
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