Pythonでsoxを使用したいが認識してくれない

前提・実現したいこと

Pythonで音声認識をするべく、公開されているソースコードを用いて実行を試みており、そのためにsoxというモジュールを使用したいのですが、Pythonが認識してくれません。

jupyter notebookを使っています。

発生している問題・エラーメッセージ

This install of SoX cannot process .wav files.
This install of SoX cannot process .wav files.

oto/data/original/jsut_ver1.1/basic5000/wav\BASIC5000_0001.wav
---------------------------------------------------------------------------
FileNotFoundError                         Traceback (most recent call last)
<ipython-input-2-eceebcabe0cd> in <module>
     33                 exit()
     34 
---> 35             tfm.build_file(input_filepath=wav_path_in, 
     36                            output_filepath=wav_path_out)
     37 

c:\users\tsujo\appdata\local\programs\python\python39\lib\site-packages\sox\transform.py in build_file(self, input_filepath, output_filepath, input_array, sample_rate_in, extra_args, return_output)
    708 
    709         '''
--> 710         return self.build(
    711             input_filepath, output_filepath, input_array, sample_rate_in,
    712             extra_args, return_output

c:\users\tsujo\appdata\local\programs\python\python39\lib\site-packages\sox\transform.py in build(self, input_filepath, output_filepath, input_array, sample_rate_in, extra_args, return_output)
    591 
    592         '''
--> 593         input_format, input_filepath = self._parse_inputs(
    594             input_filepath, input_array, sample_rate_in
    595         )

c:\users\tsujo\appdata\local\programs\python\python39\lib\site-packages\sox\transform.py in _parse_inputs(self, input_filepath, input_array, sample_rate_in)
    494             input_format = self.input_format
    495             if input_format.get('channels') is None:
--> 496                 input_format['channels'] = file_info.channels(input_filepath)
    497         elif input_array is not None:
    498             if not isinstance(input_array, np.ndarray):

c:\users\tsujo\appdata\local\programs\python\python39\lib\site-packages\sox\file_info.py in channels(input_filepath)
     80     '''
     81     validate_input_file(input_filepath)
---> 82     output = soxi(input_filepath, 'c')
     83     return int(output)
     84 

c:\users\tsujo\appdata\local\programs\python\python39\lib\site-packages\sox\core.py in soxi(filepath, argument)
    145 
    146     try:
--> 147         shell_output = subprocess.check_output(
    148             args,
    149             stderr=subprocess.PIPE

c:\users\tsujo\appdata\local\programs\python\python39\lib\subprocess.py in check_output(timeout, *popenargs, **kwargs)
    422         kwargs['input'] = empty
    423 
--> 424     return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
    425                **kwargs).stdout
    426 

c:\users\tsujo\appdata\local\programs\python\python39\lib\subprocess.py in run(input, capture_output, timeout, check, *popenargs, **kwargs)
    503         kwargs['stderr'] = PIPE
    504 
--> 505     with Popen(*popenargs, **kwargs) as process:
    506         try:
    507             stdout, stderr = process.communicate(input, timeout=timeout)

c:\users\tsujo\appdata\local\programs\python\python39\lib\subprocess.py in __init__(self, args, bufsize, executable, stdin, stdout, stderr, preexec_fn, close_fds, shell, cwd, env, universal_newlines, startupinfo, creationflags, restore_signals, start_new_session, pass_fds, user, group, extra_groups, encoding, errors, text, umask)
    949                             encoding=encoding, errors=errors)
    950 
--> 951             self._execute_child(args, executable, preexec_fn, close_fds,
    952                                 pass_fds, cwd, env,
    953                                 startupinfo, creationflags, shell,

c:\users\tsujo\appdata\local\programs\python\python39\lib\subprocess.py in _execute_child(self, args, executable, preexec_fn, close_fds, pass_fds, cwd, env, startupinfo, creationflags, shell, p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite, unused_restore_signals, unused_gid, unused_gids, unused_uid, unused_umask, unused_start_new_session)
   1418             # Start the process
   1419             try:
-> 1420                 hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
   1421                                          # no special security
   1422                                          None, None,

FileNotFoundError: [WinError 2] 指定されたファイルが見つかりません。

該当のソースコード

Python
1import sox
2
3import os
4
5if __name__ == "__main__":
6
7    original_wav_dir = 'oto/data/original/jsut_ver1.1/basic5000/wav'
8
9    out_wav_dir = 'oto/data/wav'
10
11    out_scp_dir = 'oto/data/label/all'
12
13    os.makedirs(out_wav_dir, exist_ok=True)
14    os.makedirs(out_scp_dir, exist_ok=True)
15
16    tfm = sox.Transformer()
17
18    tfm.convert(samplerate=16000)
19
20    with open(os.path.join(out_scp_dir, 'wav.scp'), mode='w') as scp_file:
21
22        for i in range(5000):
23            filename = 'BASIC5000_%04d' % (i+1)
24 
25            wav_path_in = os.path.join(original_wav_dir, filename+'.wav')
26
27            wav_path_out = os.path.join(out_wav_dir, filename+'.wav')
28
29            print(wav_path_in)
30
31            if not os.path.exists(wav_path_in):
32                print('Error: Not found %s' % (wav_path_in))
33                exit()
34
35            tfm.build_file(input_filepath=wav_path_in, 
36                           output_filepath=wav_path_out)
37
38            scp_file.write('%s %s\n' % 
39                           (filename, os.path.abspath(wav_path_out)))
40
41