From cedafd791930b50affc4411f7b41acc641fcd7d7 Mon Sep 17 00:00:00 2001
From: DL1YCF <dl1ycf@darc.de>
Date: Mon, 25 May 2020 21:42:17 +0200
Subject: [PATCH] added some more comments
---
transmitter.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/transmitter.c b/transmitter.c
index 6254dd6..af466a8 100644
--- a/transmitter.c
+++ b/transmitter.c
@@ -817,8 +817,8 @@ fprintf(stderr,"transmitter: allocate buffers: mic_input_buffer=%d iq_output_buf
// is is also used to shape the audio samples
cw_shape_buffer48=g_new(double,tx->buffer_size);
if (protocol == NEW_PROTOCOL || protocol == SOAPYSDR_PROTOCOL) {
- // We need this buffer for the new protocol only, where it is only
- // used to shape the TX envelope
+ // In the original protocol (P1) the TX sample rate equals the
+ // mic sample rate, therefore we do not need this buffer there
cw_shape_buffer192=g_new(double,tx->output_samples);
}
fprintf(stderr,"transmitter: allocate buffers: mic_input_buffer=%p iq_output_buffer=%p pixels=%p\n",tx->mic_input_buffer,tx->iq_output_buffer,tx->pixel_samples);
@@ -1129,6 +1129,10 @@ static void full_tx_buffer(TRANSMITTER *tx) {
break;
#ifdef SOAPYSDR
case SOAPYSDR_PROTOCOL:
+ //
+ // the only difference to the P2 treatment is that we do not
+ // generate audio samples to be sent to the radio
+ //
isample=0;
for(j=0;j<tx->output_samples;j++) {
ramp=cw_shape_buffer192[j]; // between 0.0 and 1.0
@@ -1335,6 +1339,10 @@ void add_mic_sample(TRANSMITTER *tx,float mic_sample) {
cw_shape_buffer192[4*tx->samples+3]=0.0;
}
if (protocol == SOAPYSDR_PROTOCOL) {
+ //
+ // this essentially the P2 code, where the ratio
+ // is fixed to 4
+ //
int ratio = tx->output_samples / tx->buffer_size;
int i=ratio*tx->samples;
int j;
--
2.45.2