python3においてwavファイルを保存しようとするとエラーが発生する

前提・実現したいこと

pythonで音声認識をするための前処理として読み込んだwavファイル(A)にFIRフィルタをかけたwavファイル(B)を保存したい

発生している問題・エラーメッセージ

Traceback (most recent call last):
  File "fir.py", line 43, in <module>
    save(y, fs, 16, "fir_combined_sine.wav")
  File "fir.py", line 24, in save
    wf.writeframes(data)
  File "/home/hoge/.pyenv/versions/anaconda3-5.0.1/lib/python3.6/wave.py", line 427, in writeframes
    self.writeframesraw(data)
  File "/home/hoge/.pyenv/versions/anaconda3-5.0.1/lib/python3.6/wave.py", line 416, in writeframesraw
    self._ensure_header_written(len(data))
  File "/home/hoge/.pyenv/versions/anaconda3-5.0.1/lib/python3.6/wave.py", line 457, in _ensure_header_written
    self._write_header(datasize)
  File "/home/hoge/.pyenv/versions/anaconda3-5.0.1/lib/python3.6/wave.py", line 474, in _write_header
    self._sampwidth * 8, b'data'))
struct.error: required argument is not an integer
Exception ignored in: <bound method Wave_write.__del__ of <wave.Wave_write object at 0x7fab1a6fae10>>
Traceback (most recent call last):
  File "/home/hoge/.pyenv/versions/anaconda3-5.0.1/lib/python3.6/wave.py", line 316, in __del__
    self.close()
  File "/home/hoge/.pyenv/versions/anaconda3-5.0.1/lib/python3.6/wave.py", line 434, in close
    self._ensure_header_written(0)
  File "/home/hoge/.pyenv/versions/anaconda3-5.0.1/lib/python3.6/wave.py", line 457, in _ensure_header_written
    self._write_header(datasize)
  File "/home/hoge/.pyenv/versions/anaconda3-5.0.1/lib/python3.6/wave.py", line 474, in _write_header
    self._sampwidth * 8, b'data'))
struct.error: required argument is not an integer

該当のソースコード

#coding:utf-8
import wave
import struct
from pylab import *

def fir(x,b):
	y = [0.0] * len(x)
	N = len(b) - 1
	for n in range(len(x)):
		for i in range(N+1):
			if n - i >= 0:
				y[n] += b[i] * x[n - i]
	return y

def save(data, fs, bit, filename):
    wf = wave.open(filename, "w")
    wf.setnchannels(1)
    wf.setsampwidth(bit / 8)
    wf.setframerate(fs)
    wf.writeframes(data)
    wf.close()

if __name__ == '__main__':
    wf = wave.open("data/VOICEACTRESS100_092.wav", "r")
    fs = wf.getnframes()

    x = wf.readframes(wf.getnframes())
    x = frombuffer(x, dtype="int16") / 32768.0

    b = [1, -0.97]
    y = fir(x, b)

    y = [int(v * 32767.0) for v in y]
    y = struct.pack("h" * len(y), *y)

    save(y, fs, 16, "fir_test.wav")