From d77102426a8148575eb134f443d506032fceda85 Mon Sep 17 00:00:00 2001 From: Brumi-2021 Date: Tue, 2 May 2023 21:29:35 +0200 Subject: [PATCH] Finally Noise Signal with best option 16 bit LFSR --- firmware/application/apps/ui_siggen.hpp | 12 +++------- firmware/baseband/proc_siggen.cpp | 32 +++++++++++++------------ firmware/baseband/proc_siggen.hpp | 12 +++++----- 3 files changed, 26 insertions(+), 30 deletions(-) diff --git a/firmware/application/apps/ui_siggen.hpp b/firmware/application/apps/ui_siggen.hpp index a4922d861..319543758 100644 --- a/firmware/application/apps/ui_siggen.hpp +++ b/firmware/application/apps/ui_siggen.hpp @@ -48,17 +48,14 @@ private: void update_tone(); void on_tx_progress(const uint32_t progress, const bool done); - const std::string shape_strings[10] = { + const std::string shape_strings[7] = { "CW-just carrier", "Sine signal ", "Triangle signal", "Saw up signal ", "Saw down signal", "Square signal ", - "Noise 8-nx20Khz", // using 8 bits LFSR register, 6 order polynomial feedback. - "Noise 8-nx10khz", // using 8 bits LFSR register, 7 order polynomial feedback. - "Noise 8 -nx5khz ", // using 8 bits LFSR register, 8 order polynomial feedback. - "Noise 16-nx1khz" // using 16 bits LFSR register, 16 order polynomial feedback. + "White Noise " // using 16 bits LFSR register, 16 order polynomial feedback. }; bool auto_update { false }; @@ -81,10 +78,7 @@ private: { &bitmap_sig_saw_up, 3 }, { &bitmap_sig_saw_down, 4 }, { &bitmap_sig_square, 5 }, - { &bitmap_sig_noise, 6 }, - { &bitmap_sig_noise, 7 }, - { &bitmap_sig_noise, 8 }, - { &bitmap_sig_noise, 9 } + { &bitmap_sig_noise, 6 } } }; diff --git a/firmware/baseband/proc_siggen.cpp b/firmware/baseband/proc_siggen.cpp index 714f51202..810477cf0 100644 --- a/firmware/baseband/proc_siggen.cpp +++ b/firmware/baseband/proc_siggen.cpp @@ -61,21 +61,9 @@ void SigGenProcessor::execute(const buffer_c8_t& buffer) { } else if (tone_shape == 5) { // Square sample = (((tone_phase & 0xFF000000) >> 24) & 0x80) ? 127 : -128; - } else if (tone_shape == 6) { // taps: 6 5; feedback polynomial: x^6 + x^5 + 1 , Periode 63 = 2^n-1,it generates armonincs n x 20Khz - // White Noise generator, pseudo random noise generator, 8 bits linear-feedback shift register (LFSR) algorithm, variant Fibonacci. + } else if (tone_shape == 6) { // White Noise generator, pseudo random noise generator, 8 bits linear-feedback shift register (LFSR) algorithm, variant Fibonacci. // https://en.wikipedia.org/wiki/Linear-feedback_shift_register - bit = ((lfsr >> 2) ^ (lfsr >> 3)) & 1; - lfsr = (lfsr >> 1) | (bit << 7); - sample = lfsr; - } else if (tone_shape == 7) { // taps: 7 6; feedback polynomial: x^7 + x^6 + 1 , Periode 127 = 2^n-1,it generates armonincs n x 10Khz - bit = ((lfsr >> 1) ^ (lfsr >> 2)) & 1; - lfsr = (lfsr >> 1) | (bit << 7); - sample = lfsr; - } else if (tone_shape == 8) { //taps:8,6,5,4;feedback polynomial: x^8 + x^6 + x^5 + x^4 + 1,Periode 255= 2^n-1, armonics n x 5khz - bit = ((lfsr >> 0) ^ (lfsr >> 2) ^ (lfsr >> 3) ^ (lfsr >> 4)) & 1; - lfsr = (lfsr >> 1) | (bit << 7); - sample = lfsr; - } else if (tone_shape == 9) { // 16 bits LFSR .taps: 16, 15, 13, 4 ;feedback polynomial: x^16 + x^15 + x^13 + x^4 + 1 + // 16 bits LFSR .taps: 16, 15, 13, 4 ;feedback polynomial: x^16 + x^15 + x^13 + x^4 + 1 // Periode 65535= 2^n-1, harmonics every < 1Khz , quite continuous . if (counter == 0) { bit_16 = ((lfsr_16 >> 0) ^ (lfsr_16 >> 1) ^ (lfsr_16 >> 3) ^ (lfsr_16 >> 4) ^ (lfsr_16 >> 12) & 1); @@ -87,6 +75,20 @@ void SigGenProcessor::execute(const buffer_c8_t& buffer) { counter = 0; } } + + /* else if (tone_shape == 7) { // 8 bit options, finally not used- + bit = ((lfsr >> 2) ^ (lfsr >> 3)) & 1; // taps: 6 5; feedback polynomial: x^6 + x^5 + 1 , Periode 63 = 2^n-1,it generates armonincs n x 20Khz + lfsr = (lfsr >> 1) | (bit << 7); + sample = lfsr; + } else if (tone_shape == 8) { // taps: 7 6; feedback polynomial: x^7 + x^6 + 1 , Periode 127 = 2^n-1,it generates armonincs n x 10Khz + bit = ((lfsr >> 1) ^ (lfsr >> 2)) & 1; + lfsr = (lfsr >> 1) | (bit << 7); + sample = lfsr; + } else if (tone_shape == 9) { //taps:8,6,5,4;feedback polynomial: x^8 + x^6 + x^5 + x^4 + 1,Periode 255= 2^n-1, armonics n x 5khz + bit = ((lfsr >> 0) ^ (lfsr >> 2) ^ (lfsr >> 3) ^ (lfsr >> 4)) & 1; + lfsr = (lfsr >> 1) | (bit << 7); + sample = lfsr; } */ + if (tone_shape < 6) { tone_phase += tone_delta; @@ -125,7 +127,7 @@ void SigGenProcessor::on_message(const Message* const msg) { fm_delta = message.bw * (0xFFFFFFULL / 1536000); tone_shape = message.shape; - lfsr = seed_value ; // init lfsr 8 bits. + // lfsr = seed_value ; // Finally not used , init lfsr 8 bits. lfsr_16 = seed_value_16; // init lfsr 16 bits. configured = true; diff --git a/firmware/baseband/proc_siggen.hpp b/firmware/baseband/proc_siggen.hpp index 84c6b896c..0bbcf36f7 100644 --- a/firmware/baseband/proc_siggen.hpp +++ b/firmware/baseband/proc_siggen.hpp @@ -42,13 +42,13 @@ private: uint8_t tone_shape { }; uint32_t sample_count { 0 }; bool auto_off { }; - int32_t phase { 0 }, sphase { 0 }, delta { 0 }; // they may have sign . - int8_t sample { 0 }, re { 0 }, im { 0 }; // they may have sign . - uint8_t seed_value = {0x56}; // seed 8 bits lfsr : any nonzero start state will work. - uint16_t seed_value_16 = {0xACE1}; // seed 16 bits lfsr : any nonzero start state will work. - uint8_t lfsr { }, bit { }; // bit must be 8-bit to allow bit<<7 later in the code */ - uint16_t lfsr_16 { }, bit_16 { }; // bit must be 8-bit to allow bit<<7 later in the code */ + int32_t phase { 0 }, sphase { 0 }, delta { 0 }; // they may have sign in the pseudo random sample generation. + int8_t sample { 0 }, re { 0 }, im { 0 }; // they have sign + and -. + uint16_t seed_value_16 = {0xACE1}; // seed 16 bits lfsr : any nonzero start state will work. + uint16_t lfsr_16 { }, bit_16 { }; // bit must be 16-bit to allow bit<<15 later in the code */ uint8_t counter {0}; + // uint8_t seed_value = {0x56}; // Finally not used lfsr of 8 bits , seed 8blfsr : any nonzero start state will work. + // uint8_t lfsr { }, bit { }; // Finally not used lfsr of 8 bits , bit must be 8-bit to allow bit<<7 later in the code */ TXProgressMessage txprogress_message { }; };