diff --git a/candle-examples/examples/whisper/audio.rs b/candle-examples/examples/whisper/audio.rs
index d50b7923..d095e239 100644
--- a/candle-examples/examples/whisper/audio.rs
+++ b/candle-examples/examples/whisper/audio.rs
@@ -148,7 +148,7 @@ fn log_mel_spectrogram_w<T: Float>(
     mel
 }
 
-fn log_mel_spectrogram_<T: Float>(
+fn log_mel_spectrogram_<T: Float + std::fmt::Display>(
     samples: &[T],
     filters: &[T],
     fft_size: usize,
@@ -200,20 +200,17 @@ fn log_mel_spectrogram_<T: Float>(
     mel
 }
 
-pub fn pcm_to_mel<T: Float>(
+pub fn pcm_to_mel<T: Float + std::fmt::Display>(
     samples: &[T],
     filters: &[T],
-    n_mel: usize,
-    n_fft: usize,
 ) -> anyhow::Result<Vec<T>> {
-    if filters.len() != n_mel * n_fft {
-        anyhow::bail!(
-            "unexpected filter length {} (n_mel: {}, n_fft: {})",
-            filters.len(),
-            n_mel,
-            n_fft
-        )
-    }
-    let mel = log_mel_spectrogram_(samples, filters, n_fft, super::HOP_LENGTH, n_mel, false);
+    let mel = log_mel_spectrogram_(
+        samples,
+        filters,
+        super::N_FFT,
+        super::HOP_LENGTH,
+        super::N_MELS,
+        false,
+    );
     Ok(mel)
 }
diff --git a/candle-examples/examples/whisper/main.rs b/candle-examples/examples/whisper/main.rs
index 6e15fa8a..6ea3e536 100644
--- a/candle-examples/examples/whisper/main.rs
+++ b/candle-examples/examples/whisper/main.rs
@@ -201,7 +201,6 @@ fn main() -> Result<()> {
     let mel_filters = mel_filters.deserialize()?;
     let mel_filters = mel_filters.tensor("mel_80", &device)?;
     println!("loaded mel filters {:?}", mel_filters.shape());
-    let (n_mel, n_fft) = mel_filters.shape().r2()?;
     let mel_filters = mel_filters.flatten_all()?.to_vec1::<f32>()?;
 
     let mut input = std::fs::File::open(args.input)?;
@@ -215,9 +214,10 @@ fn main() -> Result<()> {
         .iter()
         .map(|v| *v as f32 / 32768.)
         .collect();
-    let mel = audio::pcm_to_mel(&pcm_data, &mel_filters, n_mel, n_fft)?;
+    println!("pcm data loaded {}", pcm_data.len());
+    let mel = audio::pcm_to_mel(&pcm_data, &mel_filters)?;
     let mel_len = mel.len();
-    let mel = Tensor::from_vec(mel, (1, n_mel, mel_len / n_mel), &device)?;
+    let mel = Tensor::from_vec(mel, (1, N_MELS, mel_len / N_MELS), &device)?;
     println!("loaded mel: {:?}", mel.dims());
 
     let weights = unsafe { candle::safetensors::MmapedFile::new(args.weights)? };