draft: true
Name: Talker
short-description: Proof of concept speech synthesizer, based on TalkiePCM, inspired by 1970s LPC speech synths.
Language: C++ (Pico SDK + ComputerCard)
Creator: Chris Johnson
Version: 0.1
Status: WIP
License: GPL-3.0
date-created: 2024-11-30
date-updated: 2025-02-04

tags:
  - speech
  - synth
  - lpc
  - audio-processing

summary: |
  Early proof-of-concept LPC speech card that babbles randomized words. Z switch sets continuous,
  off, or single-word behavior. Main + CVIn1 set pitch (with X as attenuverter), while Y + CVIn2
  set speaking speed. AudioOut1 is speech, AudioOut2 exposes the LPC exciter components.

panel:
  inputs:
    - id: AudioIn1
      name: Exciter Audio Replace
      type: audio
      description: When patched, replaces the pitched component of the LPC exciter path
    - id: CVIn1
      name: Pitch CV
      type: cv
      description: Adds pitch modulation, scaled by knob X attenuverter
    - id: CVIn2
      name: Speed CV
      type: cv
      description: Adds modulation to babble speed
  outputs:
    - id: AudioOut1
      name: Speech Output
      type: audio
      description: Main synthesized speech output
    - id: AudioOut2
      name: LPC Exciter Components
      type: audio
      description: Pitched and noise components of the LPC exciter
    - id: CVOut1
      name: Exciter Amplitude
      type: cv
      description: Exciter amplitude control signal output
    - id: CVOut2
      name: Exciter Pitch
      type: cv
      description: Exciter pitch control signal output

controls:
  knobs:
    - when: { z: up }
      main:
        name: Pitch
        description: Sets base speech pitch
      x:
        name: Pitch CV Attenuverter
        description: Attenuverts CVIn1 pitch modulation amount
      y:
        name: Babble Speed
        description: Sets speed of generated speech
    - when: { z: middle }
      main:
        name: Off
        description: Speech generation is muted
    - when: { z: down }
      main:
        name: Single Word Trigger
        description: Triggers a single spoken word