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Digital amplifier features built-in audio DSP

Posted: 04 Dec 2008     Print Version  Bookmark and Share

Keywords:digital amplifier  audio DSP  digital input 


Renesas Technology Corp. has introduced a compact, high-performance digital amplifier supporting IIS digital audio signal input with a built-in 24-bit audio DSP. The R2J15116FP is intended for use in thin flat-screen TVs employing LCD or plasma display panels.

The R2J15116FP accepts IIS digital audio signal input, performs signal processing using a built-in audio DSP, and amplifies the result with a digital amplifier to deliver stereo output to two speakers at up to 15 watts per channel. Its main features are as follows.

(1) Integrated audio DSP for reduction of mounting area by approximately half

The design emphasis for thin flat-screen TVs becomes slim, resulting in demand for an audio processing system implemented on highly integrated ICs for compactness. The R2J15116FP integrates a digital amplifier and a 24-bit audio DSP in a single compact package measuring only 7 mm × 7 mm. This reduces the mounting area by about half, compared with the two-package products, and helps reduce the size and cost of the system overall.

(2) Integrated audio DSP allowing detailed tuning of audio characteristics

Thin flat-screen TVs require detailed tuning of their audio systems for different markets and screen sizes. This processing is usually performed in the preceding stage of this digital amplifier by the main DSP, which mainly handles tasks such as surround processing and decoding. This imposes a significant processing load. In the R2J15116FP, in contrast, processing for the volume control and the parametric equaliser for optimising the speaker characteristics is done by the built-in audio DSP. This reduces the load on the main DSP and makes it possible to generate a more varied and higher quality sound environment for video applications.

(3) Achieves superior sound quality

The R2J15116FP achieves better audio signal performance and quality than conventional digital volume control implemented using a DSP, through the use of Renesas Technology's exclusive intelligent volume function, which offers higher resolution when switching the volume level for smoother volume level transitions. The R2J15116FP also uses a feedback circuit to stabilise the output level when the power supply voltage fluctuates, an approach with a proven track record in products employing analogue input.

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