The 296e Spectral Processor performs vocoding by transferring the spectral envelope of one signal onto another across 16 bandpass filters

The 296e is a 16-band bandpass filter bank with per-channel VCAs and envelope followers. Its spectral transfer feature routes the envelope followers from one input (odd) to control the VCAs of another signal (even), performing vocoding internally. A SPEC-TRUM XFER switch accomplishes this with a single button rather than 16 patch cables. Two 296e modules in series provide more accurate vocoding (the second module analyzes and transfers via the internal bus). The module also supports morphing between two user-programmed spectral curves (A and B levels), comb filtering via odd/even split, and real-time spectral display.

Examples

Patch speech into the odd input and a sustained drone into the even input; select odd-to-even spectral transfer to impose the speech’s spectral contour onto the drone, producing a vocoded effect.

Assessment

Describe what odd-to-even spectral transfer does at the signal processing level. Explain why using two 296e modules produces more accurate vocoding than one, and what ext-to-all mode enables on the first unit.