From 55279532a6cb9e48fd1ede2fbebb3e3c03af72c5 Mon Sep 17 00:00:00 2001 From: f4exb Date: Sat, 7 Mar 2020 22:05:56 +0100 Subject: [PATCH] ChirpChat mod: increment or decrement phase for up and down chirps --- plugins/channeltx/modchirpchat/chirpchatmodsource.cpp | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/plugins/channeltx/modchirpchat/chirpchatmodsource.cpp b/plugins/channeltx/modchirpchat/chirpchatmodsource.cpp index 4502e5e4a..900375ee3 100644 --- a/plugins/channeltx/modchirpchat/chirpchatmodsource.cpp +++ b/plugins/channeltx/modchirpchat/chirpchatmodsource.cpp @@ -198,7 +198,7 @@ void ChirpChatModSource::modulateSample() } else if (m_state == ChirpChatStatePreamble) { - m_modPhasor += m_phaseIncrements[m_chirp]; + m_modPhasor += m_phaseIncrements[m_chirp]; // up chirps m_modSample = Complex(std::polar(0.891235351562 * SDR_TX_SCALED, m_modPhasor)); m_fftCounter++; @@ -229,7 +229,7 @@ void ChirpChatModSource::modulateSample() } else if (m_state == ChirpChatStateSyncWord) { - m_modPhasor += m_phaseIncrements[m_chirp]; + m_modPhasor += m_phaseIncrements[m_chirp]; // up chirps m_modSample = Complex(std::polar(0.891235351562 * SDR_TX_SCALED, m_modPhasor)); m_fftCounter++; @@ -252,8 +252,7 @@ void ChirpChatModSource::modulateSample() } else if (m_state == ChirpChatStateSFD) { - int chirpIndex = m_fftLength*ChirpChatModSettings::oversampling - 1 - m_chirp; - m_modPhasor += m_phaseIncrements[chirpIndex]; + m_modPhasor -= m_phaseIncrements[m_chirp]; // down chirps m_modSample = Complex(std::polar(0.891235351562 * SDR_TX_SCALED, m_modPhasor)); m_fftCounter++; m_sampleCounter++; @@ -282,7 +281,7 @@ void ChirpChatModSource::modulateSample() } else if (m_state == ChirpChatStatePayload) { - m_modPhasor += m_phaseIncrements[m_chirp]; + m_modPhasor += m_phaseIncrements[m_chirp]; // up chirps m_modSample = Complex(std::polar(0.891235351562 * SDR_TX_SCALED, m_modPhasor)); m_fftCounter++;