454 Karplus-Strong String Synthesis

454 : Karplus-Strong String Synthesis

  • Author: Chinmay Patil
  • Description: Plucked string sound synthesizer
  • GitHub repository
  • Clock: 256000 Hz

How it works

This is simplified implementation of Karplus-Strong (KS) string synthesis based on papers, Digital Synthesis of Plucked-String and Drum Timbres and Extensions of the Karplus-Strong Plucked-String Algorithm.

A register map controls and configures the KS synthesis module. This register map is accessed through a SPI interface. Synthesized sound samples can be accessed through the I2S transmitter interface.

SPI Frame

SPI Mode: CPOL = 0, CPHA = 1

The 16-bit SPI frame is defined as,

Read=1/Write=0 Address[6:0] Data[7:0]

Register Map

The Register Map has 16 Registers of 8-bits each.

Complete register map is described in the repository at https://github.com/pyamnihc/tt04-um-ks-pyamnihc.

I2S Transmitter

The 8-bit signed sound samples can be read out at f_sck = 256 kHz through this interface.

How to test

Connect a clock with frequency f_clk = 256 kHz and apply a reset cycle to initialize the design, this sets the audio sample rate at fs = 16 kHz. Use the spi register map or the ui_in to futher configure the design. The synthesized samples are sent continuously on the I2S transmitter interface.

IO

#InputOutputBidirectional
0~rst_n_prbs_15, ~rst_n_prbs_7segment asck_i
1load_prbs_15, load_prbs_7segment bsdi_i
2freeze_prbs_15segment csdo_o
3freeze_prbs_7segment dcs_ni
4i2s_noise_selsegment ei2s_sck_o
5~rst_n_ks_stringsegment fi2s_ws_o
6plucksegment gi2s_sd_o
7NOT CONNECTEDdotprbs_15

Chip location

Controller Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux tt_um_chip_rom (Chip ROM) tt_um_factory_test (TinyTapeout 05 Factory Test) tt_um_loopback (TinyTapeout 05 Loopback Test Module) tt_um_Leaky_Integrate_Fire_nfjesifb (Leaky Integrate and Fire Neuron Model) tt_um_topModuleKA (Time Multiplexed Neuron Ckt) tt_um_sap_1 (SAP-1 Computer) tt_um_lif (Leaky Integrate-and-Fire Neuron (Verilog Demo)) tt_um_jleugeri_ticktocktokens (TickTockTokens) tt_um_LSNN (Spiking LSTM Network) tt_um_if (Integrate-and-Fire Neuron. (Verilog Demo)) tt_um_mihailocode_neural_network (Neural network on chip) tt_um_hls_lfi (Simple Leaky Integrate and Fire (LIF) Neuron) tt_um_diadatp_spigot_e (e Spigot) tt_um_kskyou (Continued Fraction Calculator) tt_um_wokwi_380005495431181313 (Water Pump Controller) tt_um_EventFilter (Event Denoising Circuit) tt_um_wokwi_380416099936681985 (7 segment seconds (Verilog Demo)) tt_um_freq_hcohensa (Frequency Encoder/Decoder) tt_um_wokwi_380410498092232705 (UART Greeter with RNN Module) tt_um_wokwi_380120751165092865 (WS2812B LED strip driver) tt_um_wokwi_380408486941145089 (Tiny Tapeout 5 Workshop) tt_um_wokwi_380409169798008833 (Tiny Tapeout 1) tt_um_wokwi_380409488188706817 (Supercon Workshop) tt_um_matrix_multiplier (Matrix Multiplier) tt_um_wokwi_380408594272345089 (Clock Divider) tt_um_wokwi_380408784463076353 (Binary Counter) tt_um_wokwi_380408396356749313 (ring osc test) tt_um_7segx4_clock_abhishek_top (7 segment clock with 4 digits) tt_um_wokwi_380409481852161025 (test001) tt_um_hodgkin_huxley (Hodgkin-Huxley Chip Design) tt_um_wokwi_380408823952452609 (Character Selector) tt_um_wokwi_380409904919056385 (Intructouction to PRBS) tt_um_wokwi_380409081067502593 (tto5 Supercon Project) tt_um_jmadden173_delta_modulation (Delta Modulation Spike Encoding) tt_um_wokwi_380409086743445505 (GameOfLife) tt_um_reflex_game (Reflex Game) tt_um_wokwi_380409019830656001 (Logic Gates Tapeout) tt_um_Fiona_CMU (Stream Cipher w/ LSR) tt_um_wokwi_380409532780455937 (tt5modifyd) tt_um_alu_chip (ALU Chip) tt_um_wokwi_380408936929183745 (Tapeout Test) tt_um_rjmorgan11_calculator_chip (Calculator chip) tt_um_wokwi_380409369220404225 (Shifty Snakey) tt_um_synth_GyanepsaaS (Synth) tt_um_wokwi_380408774591779841 (Sawtooth Generator) tt_um_wokwi_380197591775930369 (Blinking A) tt_um_wokwi_380409393770716161 (Supercon 2023) tt_um_mvm (Sparsity Aware Matrix Vector Multiplication) tt_um_wokwi_380408455148316673 (Ring Oscillator and Clock Source Switch) tt_um_mv_mult_alrdelcr (Matrix Vector Multiplication (Verilog Demo)) tt_um_wokwi_380416361853146113 (IDK WHAT TO DO) tt_um_wokwi_379319062779062273 (7-segment display logic system ) tt_um_wokwi_380409568391147521 (Hardware Trojan Example) tt_um_wokwi_379824923824476161 (Analog Clock) tt_um_wokwi_380145600224164865 (7 segment display) tt_um_wokwi_379889284755158017 (W_Li_10/28) tt_um_wokwi_380408409844584449 (Supecon Gate Play) tt_um_manjushettar (ECE 183 - Integrate and Fire Network Chip Design) tt_um_wokwi_380409236812508161 (tto5) tt_um_rebel2_balanced_ternary_ALU (REBEL-2 Balanced Ternary ALU) tt_um_wokwi_380229599886002177 (Stochastic Multiplier) tt_um_jeffdi_seven_segment_seconds (7 segment seconds - count down) tt_um_wokwi_380416616536542209 (TT05 Submission) tt_um_lif_n (Leaky Integrate-and-Fire Neuron) tt_um_wokwi_379764885531576321 (Count via LFSR) tt_um_dlmiles_tt05_i2c_bert (I2C BERT) tt_um_loopback_ericsmi (tt05-loopback tile with input skew measurement) tt_um_flappy_vga_cutout1 (Flappy VGA) tt_um_async_proc_paulschulz (Asynchronous Parallel Processor Demonstrator) tt_um_wokwi_380055891603379201 (Hex Countdown) tt_um_nickjhay_processor (Matrix multiply coprocessor (8x8 1bit)) tt_um_htfab_cell_tester (Standard cell generator and tester) tt_um_wta (Winner-Take-All Network (Verilog Demo)) tt_um_muncherkin_lioncage (Lion cage) tt_um_seven_segment_seconds_ksandov4 (Brain Inspired Random Dropout Circuit) tt_um_seanvenadas (Event-Based Denoising Circuit) tt_um_wokwi_378231665807713281 (RAM cell test) tt_um_rejunity_ay8913 (Classic 8-bit era Programmable Sound Generator AY-3-8913) tt_um_rnn (RNN (Demo)) tt_um_gharenthi_top (STDP Neuron) tt_um_SNN (Basic Spiking Neural Network) tt_um_btflv_8bit_fp_adder (8 bit floating point adder) tt_um_perceptron (Perceptron Hardcoded) tt_um_jkprz (Cheap and quick STDP) tt_um_topLevel_derekabarca (Brain-Inspired Oscillatory Network) tt_um_uwuifier (UART uwuifier) tt_um_perceptron_connorguzi (Perceptron and basic binary neural network) tt_um_hadirkhan10_lif_neuron (Leaky Integrate-and-Fire Neuron) tt_um_wokwi_380119282165535745 (7 segment seconds) tt_um_uabc_electronica_2023 (UABC-ELECTRONICA) tt_um_proppy_bytebeat (bytebeat) tt_um_meriac_play_tune (Super Mario Tune on A Piezo Speaker) tt_um_wrapper_inputblackboxoutput (Byte Computer) tt_um_vhdl_seven_segment_seconds (7 segment seconds (VHDL Demo)) tt_um_cejmu (4-Bit ALU) tt_um_rejunity_sn76489 (Classic 8-bit era Programmable Sound Generator SN76489) tt_um_minipit_stevej (Miniature Programmable Interrupt Timer) tt_um_gchenfc_seven_segment_gerry (7-segment Name Display) tt_um_supertails_tetris (Tetris) tt_um_mabhari_seven_segment_seconds (Simple_Timer-MBA) tt_um_njzhu_uart (UART Receiver) tt_um_wokwi_376553022662786049 (AGL CorticoNeuro-1) tt_um_adaptive_lif (Leaky-Integrated Fire Neuron) tt_um_myuart (MyUART) tt_um_wokwi_380438365946734593 (UART test) tt_um_tkmheart (Heart Rhythm Analyzer) tt_um_stdp (Spike-timing dependent plasticity (Verilog Demo)) tt_um_wokwi_380465686251921409 (Tiny Tapeout 5 TM project1) tt_um_thermocouple (Thermocouple-to-temperature converter (digital backend)) tt_um_wokwi_380412382001715201 (Naive 8-bit Binary Counter) tt_um_asinghani_tinyscanchain_tt05 (tinyscanchain Test Design) tt_um_carlosgs99_cro_udg (6 digit chronometer.) tt_um_suhrojo (Convolutional Network Circuit Chip Design) tt_um_mvm_ (Matrix Vector Multiplication Accelerator) tt_um_perceptron_neuromeme (Perceptron (Neuromeme)) tt_um_czlucius_alu (4 Bit ALU) tt_um_BNNNeuron (Binary Neural Network (Verilog Demo)) tt_um_urish_skullfet (SkullFET) tt_um_ja1tye_sound_generator (Wavetable Sound Generator) tt_um_jaylennee_wta_pwm (PWM signal generation with Winner-Take-All selection) tt_um_joerdsonsilva_top (Multimode Modem) tt_um_toivoh_synth (Analog emulation monosynth) tt_um_tiny_game_of_life (Tiny Game of Life) tt_um_mingkaic1_stack_machine (Stack Machine) tt_um_morningjava_top (ChipTune) tt_um_urish_silife (Game of Life 8x8 (siLife)) tt_um_tt05_analog_test (TT05 Analog Testmacro (Ringo, DAC)) tt_um_wokwi_380409528895479809 (RBUART) tt_um_mattngaw_fp8 (8-bit Floating-Point Adder) tt_um_chip_inventor_music__6_bit_count (6 bit Counter and Piano Music created by Chip Inventor) tt_um_4_bit_pipeline_multiplier (4 Bit Pipelined Multiplier) tt_um_wokwi_380477805171811329 (2-Bit ALU + Dice) tt_um_wokwi_380490286828784641 (TT02 Wokwi 7seg remake) tt_um_wokwi_380361576213660673 (ping pong asic) tt_um_prg (A Boolean function based pseudo random number generator (PRNG)) tt_um_digital_clock_sellicott (Digital Desk Clock) tt_um_haozhezhu_top (4-bit FIFO/LIFO) tt_um_top_mole99 (One Sprite Pony) tt_um_GrayCounter_ariz207 (4 bit Sync Gray Code Counter) tt_um_clkdiv (Clock and Random Number Gen) tt_um_matt_divider_test (TT05 Analog Test) tt_um_tomkeddie_a (VGA Experiments) tt_um_rejunity_rule110 (Rule110 cell automata) tt_um_no_time_for_squares_tommythorn (No Time for Squares) tt_um_urish_silife_max (Game of Life 8x32 (siLife)) tt_um_gfg_development_tros (TROS) tt_um_chatgpt_snn_mtomlin5 (ChatGPT designed Spiking Neural Network) tt_um_ks_pyamnihc (Karplus-Strong String Synthesis) tt_um_dinogame (VGA Dino Game) tt_um_himanshu5_prog_chipTop (Dual Compute Unit) tt_um_rtfb_collatz (Collatz conjecture brute-forcer) tt_um_retospect_neurochip (Field Programmable Neural Array) tt_um_urish_dffram (DFFRAM Example (128 bytes)) tt_um_rejunity_snn (Chonky SNN) tt_um_hh (Hodgkin-Huxley Neuron) tt_um_wokwi_377426511818305537 (PRBS Generator) tt_um_devinatkin_stopwatch (Stop Watch) tt_um_algofoogle_vga_spi_rom (vga_spi_rom) tt_um_blink (RO and counter) tt_um_ttl74hc595_v2 (8-Bit Shift Register with Output Latches 74HC595) tt_um_psychogenic_neptuneproportional (Neptune guitar tuner (proportional window, version b, debug output on bidir pins, larger set of frequencies)) tt_um_urish_simon (Simon Says game) tt_um_kianV_rv32ima_uLinux_SoC (KianV uLinux SoC) tt_um_urish_ringosc_cnt (Ring oscillator with counter) tt_um_sunaofurukawa_cpu_8bit (cpu_8bit) tt_um_vga_clock (VGA clock) tt_um_seven_segment_seconds (7 segment seconds (Verilog Demo)) tt_um_frequency_counter (Frequency counter) tt_um_rgb_mixer (RGB Mixer) tt_um_MichaelBell_spi_peri (SPI Peripheral) tt_um_multiplexed_clock (Multiplexed clock) tt_um_psychogenic_shaman (Shaman: SHA-256 hasher) tt_um_yubex_metastability_experiment (metastability experiment) Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available