INTRODUCTION
The S5A1903X01 implements the voice intelligibility processor (VIP). The VIP is a signal processing algorithm designed to increase the intelligibility of human speech in a high ambient noise environment. Unlike noise cancellation or adaptive speech filtering systems, VIP operates on the speech signal only and is totally independent of the noise. This approach makes speech clearer and easier to understand regardless of the characteristics of the noise source, and eliminates the need for processing of the noise signal.
In addition to VIP, the S5A1903X01 includes voice equalizer. The equalizer is composed of four different frequency bands, and each band is controlled between +12dB and -12dB. Thus, it can be used to compensate of speaker characteristics.
The Figure 1 shows how the S5A1903X01 interfaces to Vocoder and Codec in cellular phone.

MAIN FEATURES
• IP Mode
• Equalizer Mode
• 16-bit Fixed Point DSP Core
• Two Internal 256-word Data RAM
• 2K-word Internal Program ROM
• Wide Range of System Clock
   : 8 - 40 MHz
   — PCM Input/ Output Interface
   — I2C Host Interface
   — Low Power Consumption
      less than 4mA in working mode
      10uA in sleep mode
   — Packages: 32-LQFP/ 32-BCC
   — 3V Single Power Supply

APPLICATIONS
• Cellular Phone
• Wireless and Traditional Telephone