VP-1608F

The VP-1608F is a CMOS voice processor chip based on the CVSD (Continuously Variable Slope Delta) modulation technique. The VP-1608F is exactly the same as the (now obsolete) VP-1608 except that it is packaged in 64-pin QFP nstead of 68-pin PLCC.

Note that although the dual channel output of VP-1608F provided by the VP-1608F can be used as a stereo output, it will be hard to do so since the VP-880 Voice Development System does not allow voice digitization in stereo mode.

Therefore the dual channel output of VP-1608F is usually used in applications where sound synchronization is not critical. For example, in a game equipment, channel A can be playing a continuous background sound while channel B plays short sound effects based on the player's action.

The dual channel output is available on two separate output pins. VP-1608F can be used independently, or mixed together externally. Each channel may control up to 64 sound segments stored in 4 different EPROM banks, with up to 16 segments in each bank.

Each segment stored in the EPROM is represented by a unique binary code: 2 bits for the bank code and 4 bits for the segment code. A valid code plus a strobe signal are all it takes to activate a certain segment.The VP-1608F can operate in a wide range of sampling rates (from 16 to 128 Kbps). A higher sampling rate usually produces better sound quality at the expense of higher memory cost. As a rule of thumb, start with 32 Kbps. A 1M EPROM can store 32 seconds of sound at this rate.

Thanks to the chip's high internal integration, very little external components are required to build a VP-1608F based design. The VP-880 Voice Development System is available for quick and easy in-house voice development.