Vocal Resposne

NaamaK

Hello,

I am building experiments in which I want the participants to give a vocal response instead of a keyboard response. I do not need a recording of their responses, however, I need the onset of the vocal response to be recognized in order to log the RT, and move to the next slide in the sequence.

I am having trouble getting this done. It seems that PyAudio does not work with Pyton 3.6.6

I am attaching my inline script.

I would greatly appreciate the help.

script:

import pyaudio
import struct
import math

# A low threshold increases sensitivity, a high threshold
# reduces it.
sound_threshold = 0.5
# Maximum response time
timeout = 5000

FORMAT = pyaudio.paInt16
SHORT_NORMALIZE = (1.0/32768.0)
CHANNELS = 2
RATE = 44100
INPUT_BLOCK_TIME = 0.01
INPUT_FRAMES_PER_BLOCK = int(RATE*INPUT_BLOCK_TIME)
chunk=1024

def get_rms(block):

"""Get root mean square as a measure of loudness"""

count = len(block)/2
format = "%dh" % (count)
shorts = struct.unpack( format, block )
sum_squares = 0.0
for sample in shorts:
n = sample * SHORT_NORMALIZE
sum_squares += n*n
return math.sqrt( sum_squares / count )

# Open the mic
stream = pyaudio.PyAudio().open(
format=FORMAT,
channels=CHANNELS,
rate=RATE,
input=True,
input_device_index=0,
frames_per_buffer=INPUT_FRAMES_PER_BLOCK
)

# Listen for sounds until a sound is detected or a timeout occurs.
start_time = clock.time()
while True:
if clock.time() - start_time >= timeout:
response_time = timeout
response = u'timeout'
var.loudness = None
break
try:
block = stream.read(chunk)
except IOError as e:
print (e)
loudness = get_rms(block)
if loudness > sound_threshold:
response_time = clock.time() - start_time
response = u'detected'
var.loudness = loudness
break

# Process the response
set_response(response=response, response_time=response_time)

# Close the audio stream
stream.close()
pyaudio.PyAudio().terminate()

eduard

Hi,

Have you checked other discussions on the forum? Voice key has been discussed a lot.

e.g. :

• https://forum.cogsci.nl/discussion/5397/issue-with-response-times-and-loudness-in-a-reading-aloud-task-with-voice-key
• https://forum.cogsci.nl/discussion/5965/voice-key-recording/p1

Generally, it would also help, if you describe the problems that you have in more detail. Like what is the behaviour you observe? Which parts work, which don't? Are there any error messages?

With these kind of information we can help you in a more targeted way.

Thanks,

Eduard