diff --git a/main.cpp b/main.cpp
index e7fe4d4..e702e32 100644
--- a/main.cpp
+++ b/main.cpp
@@ -26,7 +26,7 @@ using namespace std::literals::chrono_literals;
 void fft_mag(std::complex<float>* in, float* out, size_t len);
 
 
-static const size_t block_len = 16384;
+static const size_t frame_len = 16384;
 static const int wf_width = 1000;
 static const int wf_height = 1200;
 
@@ -58,7 +58,7 @@ static void tec_thread()
 
 static std::atomic<bool> poh_accept_input;
 static std::binary_semaphore poh_input_ready{0};
-static std::complex<float> poh_input_block[block_len];
+static std::complex<float> poh_input_frame[frame_len];
 static std::mutex wf_poh_mutex;
 static unsigned int wf_poh[wf_width*wf_height];
 
@@ -69,18 +69,18 @@ static std::atomic<float> tec_p;
 
 static void poh_thread()
 {
-    std::vector<float> block_mag(block_len);
+    std::vector<float> frame_mag(frame_len);
 
-    poh_accept_input = true; // accept first block
+    poh_accept_input = true; // accept first frame
     while(!shutdown_threads) {
         poh_input_ready.acquire();
 
-        fft_mag(poh_input_block, block_mag.data(), block_len);
-        poh_accept_input = true; // poh_input_block not used again until next iteration
+        fft_mag(poh_input_frame, frame_mag.data(), frame_len);
+        poh_accept_input = true; // poh_input_frame not used again until next iteration
 
         // stabilize laser
         float freq_peak_local;
-        freq_peak_local = 40.0f*float(distance(block_mag.begin(), max_element(block_mag.begin(), block_mag.end())))/float(block_len);
+        freq_peak_local = 40.0f*float(distance(frame_mag.begin(), max_element(frame_mag.begin(), frame_mag.end())))/float(frame_len);
         freq_peak = freq_peak_local;
         float freq_error = freq_peak_local - freq_setpoint;
         tec_current = std::max(tec_bias+tec_p*freq_error, 0.0f);
@@ -90,8 +90,8 @@ static void poh_thread()
             std::lock_guard<std::mutex> guard(wf_poh_mutex);
             std::memmove(&wf_poh[wf_width], &wf_poh[0], sizeof(int)*wf_width*(wf_height - 1));
             for(int i=0;i<wf_width;i++) {
-                int j = i*block_len/wf_width;
-                wf_poh[i] = 0xff000000 | 0x010101*std::min(int(block_mag[j]/900.0f), 255);
+                int j = i*frame_len/wf_width;
+                wf_poh[i] = 0xff000000 | 0x010101*std::min(int(frame_mag[j]/900.0f), 255);
             }
             wf_poh[int(freq_setpoint*wf_width)/40] = 0xff0000ff;
         }
@@ -100,25 +100,25 @@ static void poh_thread()
 
 static std::atomic<bool> ls_accept_input;
 static std::binary_semaphore ls_input_ready{0};
-static std::complex<float> ls_input_block[block_len];
+static std::complex<float> ls_input_frame[frame_len];
 static std::mutex wf_ls_mutex;
 static unsigned int wf_ls[wf_width*wf_height];
 
 static void ls_thread()
 {
-    std::vector<float> block_mag(block_len);
+    std::vector<float> frame_mag(frame_len);
 
     ls_accept_input = true;
     while(!shutdown_threads) {
         ls_input_ready.acquire();
-        fft_mag(ls_input_block, block_mag.data(), block_len);
+        fft_mag(ls_input_frame, frame_mag.data(), frame_len);
         ls_accept_input = true;
         {
             std::lock_guard<std::mutex> guard(wf_ls_mutex);
             std::memmove(&wf_ls[wf_width], &wf_ls[0], sizeof(int)*wf_width*(wf_height - 1));
             for(int i=0;i<wf_width;i++) {
-                int j = i*block_len/wf_width;
-                wf_ls[i] = 0xff000000 | 0x010101*std::min(int(block_mag[j]/900.0f), 255);
+                int j = i*frame_len/wf_width;
+                wf_ls[i] = 0xff000000 | 0x010101*std::min(int(frame_mag[j]/900.0f), 255);
             }
         }
     }
@@ -136,9 +136,9 @@ static void* brf_dispatch(struct bladerf* dev, struct bladerf_stream* stream,
 {
     if(poh_accept_input && ls_accept_input) {
         std::complex<int16_t>* samples = (std::complex<int16_t>*)samples_v;
-        for(size_t i=0;i<block_len;i++) {
-            poh_input_block[i] = samples[2*i];
-            ls_input_block[i] = samples[2*i+1];
+        for(size_t i=0;i<frame_len;i++) {
+            poh_input_frame[i] = samples[2*i];
+            ls_input_frame[i] = samples[2*i+1];
         }
         poh_accept_input = false;
         poh_input_ready.release();
@@ -198,7 +198,7 @@ static void brf_thread()
         }
     }
     if((status = bladerf_init_stream(&brf_stream, brf_dev, brf_dispatch, &brf_buffers,
-            16, BLADERF_FORMAT_SC16_Q11, 2*block_len, 8, NULL)) != 0) {
+            16, BLADERF_FORMAT_SC16_Q11, 2*frame_len, 8, NULL)) != 0) {
         std::cerr << "failed to init bladeRF stream: " << bladerf_strerror(status) << std::endl;
         return;
     }