LM4560

LM4560 Advanced PCI Audio Accelerator December 1998 LM4560 Advanced PCI Audio Accelerator General Description LM4560 is an advanced PCI audio accelerator providing full legacy compatibility, wavetable synthesis, DirectMusic, DirectSound, and DirectSound3D on a single chip for the highperformance, cost-sensitive consumer market. It supports Sound Blaster functionality and is fully PC98 compliant. The LM4560 integrates a 64-voice wave table engine with per voice effect processing capability. It supports the upcoming Microsoft™ DirectMusic API and is fully compatible with DLS Level 1 (downloadable samples) specification. The LM4560 is optimized for Microsoft Windows™ 98 and Windows NT5.0 WDM streaming architecture with re-routable end-point support. The LM4560 includes DirectSound3D acceleration hardware for ITD (Interaural Time Difference), IID (Interaural Intensity Difference), Pan, Delay, and Doppler hardware. The LM4560 supports Sound Blaster Pro/16 DOS games while improving gaming audio quality. The LM4560 supports both the legacy analog gameport and a Digital Enhanced Game Port. When coupled with DirectInput™ driver, the Digital Enhanced Game Port can save up to 12% of the CPU overhead nominally required by a conventional analog game port. The LM4560 employs a high precision 26-bit digital mixer, providing an accurate 20-bit output and higher than 90 dB signal-to-noise ratio when used with high quality AC97 Rev 1.03 and Rev 2.0 codecs. The LM4560 is designed with aggress...