Audio setup - Revision history

Cmaina at 12:48, 29 April 2015

2015-04-29T12:48:12Z

Cmaina at 12:46, 29 April 2015

2015-04-29T12:46:27Z

Cmaina at 12:45, 29 April 2015

2015-04-29T12:45:54Z

Cmaina at 12:34, 29 April 2015

2015-04-29T12:34:03Z

Cmaina at 12:22, 29 April 2015

2015-04-29T12:22:00Z

Cmaina at 12:03, 29 April 2015

2015-04-29T12:03:06Z

Cmaina at 12:02, 29 April 2015

2015-04-29T12:02:47Z

Cmaina at 12:01, 29 April 2015

2015-04-29T12:01:21Z

Cmaina at 12:00, 29 April 2015

2015-04-29T12:00:11Z

Cmaina at 11:56, 29 April 2015

2015-04-29T11:56:11Z

@@ Line 31: / Line 31: @@
 <span style="font-family:courier new,courier,monospace;">sudo apt-get install sox</span>
-at the command line. There are two function <span style="font-family:courier new,courier,monospace;">play</span> and <span style="font-family:courier new,courier,monospace;">rec</span> which can then be used for recording and playback. To record some speech, follow the following steps
+at the command line. There are two functions&nbsp;<span style="font-family:courier new,courier,monospace;">play</span> and <span style="font-family:courier new,courier,monospace;">rec</span> which can then be used for recording and playback. To record some speech, follow the following steps
 #set the audio driver by typing <span style="font-family:courier new,courier,monospace;">export&nbsp;AUDIODRIVER=alsa</span>
 #set the recoding device by typing <span style="font-family:courier new,courier,monospace;">export&nbsp;AUDIODEV=hw:&lt;card number&gt;,&lt;device number&gt;</span>. The card and device numbers of the recording device are obtained from <span style="font-family:courier new,courier,monospace;">arecord -l. Using the result above we type export AUDIODEV=hw:1,0</span>
-#<font face="courier new, courier, monospace">Record some audio by typing <span style="font-family:courier new,courier,monospace;">rec -c 1 -r 8000 speech.wav trim 0 2</span></font>and pressing Enter. This command will record a single channel at 8kHz and save the resulting speech in <span style="font-family:courier new,courier,monospace;">speech.wav. The recording will last 2 seconds.</span>
+#<font face="courier new, courier, monospace">Record some audio by typing <span style="font-family:courier new,courier,monospace;">rec -c 1 -r 8000 speech.wav trim 0 2&nbsp;</span></font>and pressing Enter. This command will record a single channel at 8kHz and save the resulting speech in <span style="font-family:courier new,courier,monospace;">speech.wav. The recording will last 2 seconds.</span>
 '''<span style="font-size:medium;">Audio Output</span>'''

@@ Line 25: / Line 25: @@
   These device details will be useful in recording audio.
 '''<font size="2">Installing SoX for audio recording</font>'''
 SoX is a program for recording and manipulating audio. You can install it by typing&nbsp;
@@ Line 37: / Line 37: @@
 #<font face="courier new, courier, monospace">Record some audio by typing <span style="font-family:courier new,courier,monospace;">rec -c 1 -r 8000 speech.wav trim 0 2</span></font>and pressing Enter. This command will record a single channel at 8kHz and save the resulting speech in <span style="font-family:courier new,courier,monospace;">speech.wav. The recording will last 2 seconds.</span>
-<span style="font-size:medium;">Audio Output</span>
+'''<span style="font-size:medium;">Audio Output</span>'''
-<span style="font-size:medium;"></span>To playback the audio recorded, we follow the following steps
+To playback the audio recorded, we follow the following steps
 #Plug in a set of head phones in the audio jack.
 #Set the audio output to the headphones by typing <span style="font-family:courier new,courier,monospace;">amixer cset numid=3 1</span> at the command line .
-#Determine the playback device details using <span style="font-family:courier new,courier,monospace;">aplay -l&nbsp;<span style="font-family:courier new,courier,monospace;"></span></span>
+#Determine the playback device details using <span style="font-family:courier new,courier,monospace;">aplay -l&nbsp;</span>
 #Set the audio device using &nbsp;<span style="font-family:courier new,courier,monospace;">AUDIODEV=hw:&lt;card number&gt;,&lt;device number&gt;</span>.
 #Type play speech.wav
 #If the volume is too low type alsamixer and adjust the volume using the arrow keys.

@@ Line 25: / Line 25: @@
   These device details will be useful in recording audio.
 '''<font size="2">Installing SoX for audio recording</font>'''
 SoX is a program for recording and manipulating audio. You can install it by typing&nbsp;
@@ Line 32: / Line 33: @@
 at the command line. There are two function <span style="font-family:courier new,courier,monospace;">play</span> and <span style="font-family:courier new,courier,monospace;">rec</span> which can then be used for recording and playback. To record some speech, follow the following steps
-#set the audio driver by typing <span style="font-family:courier new,courier,monospace;">AUDIODRIVER=alsa</span>
+#set the audio driver by typing <span style="font-family:courier new,courier,monospace;">export&nbsp;AUDIODRIVER=alsa</span>
-#set the recoding device by typing<span style="font-family:courier new,courier,monospace;">AUDIODEV=hw:&lt;card number&gt;,&lt;device number&gt;</span>. The card and device numbers of the recording device are obtained from <span style="font-family:courier new,courier,monospace;">arecord -l. Using the result above we type AUDIODEV=hw:1,0<span style="font-family:courier new,courier,monospace;"></span></span>
+#set the recoding device by typing <span style="font-family:courier new,courier,monospace;">export&nbsp;AUDIODEV=hw:&lt;card number&gt;,&lt;device number&gt;</span>. The card and device numbers of the recording device are obtained from <span style="font-family:courier new,courier,monospace;">arecord -l. Using the result above we type export AUDIODEV=hw:1,0</span>

@@ Line 20: / Line 20: @@
   Subdevice #0: subdevice #0
   </code>
-These device details will be useful in recording audio.
+'''<font size="2">Installing SoX for audio recording</font>'''

@@ Line 3: / Line 3: @@
 '''<span style="font-size:medium;">Audio Input</span>'''
-<span style="font-size:medium;"><span style="font-size:small;">In order to record audio, we need to connect a microphone to the Pi. If you connect a USB mic, you can ensure that the Pi recognizes it by typing<span style="font-family:courier new,courier,monospace;">lsusb</span> at the command line</span></span>
+<span style="font-size:medium;"><span style="font-size:small;">In order to record audio, we need to connect a microphone to the Pi. If you connect a USB mic, you can ensure that the Pi recognizes it by typing&nbsp;<span style="font-family:courier new,courier,monospace;">lsusb</span> at the command line</span></span>
 <code>pi@raspberrypi ~ $ lsusb</code><br/><code>Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.<br/>Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub<br/>Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.<br/>Bus 001 Device 004: ID 0000:0538<br/>Bus 001 Device 006: ID 0d8c:013c C-Media Electronics, Inc. CM108 Audio Controller<br/>Bus 001 Device 005: ID 1c4f:0002 SiGma Micro Keyboard TRACER Gamma Ivory</code>
@@ Line 13: / Line 13: @@
 <code>pi@raspberrypi ~ $ arecord -l</code>
-****&nbsp;<code>List of CAPTURE Hardware Devices ****</code>
+<code>**** List of CAPTURE Hardware Devices ****</code>
 <code>card 1: Device [USB PnP Sound Device], device 0: USB Audio [USB Audio]</code>
@@ Line 22: / Line 22: @@
   </code>

@@ Line 5: / Line 5: @@
 <span style="font-size:medium;"><span style="font-size:small;">In order to record audio, we need to connect a microphone to the Pi. If you connect a USB mic, you can ensure that the Pi recognizes it by typing<span style="font-family:courier new,courier,monospace;">lsusb</span> at the command line</span></span>
-<code>pi@raspberrypi ~ $ lsusb<br/>Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.<br/>Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub<br/>Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.<br/>Bus 001 Device 004: ID 0000:0538<br/>Bus 001 Device 006: ID 0d8c:013c C-Media Electronics, Inc. CM108 Audio Controller<br/>Bus 001 Device 005: ID 1c4f:0002 SiGma Micro Keyboard TRACER Gamma Ivory</code>
+<code>pi@raspberrypi ~ $ lsusb</code>
 Here we have connected the C-Media USB Microphone.

@@ Line 3: / Line 3: @@
 '''<span style="font-size:medium;">Audio Input</span>'''
-<span style="font-size:medium;"><span style="font-size:small;">In order to record audio, we need to connect a microphone to the Pi. If you connect a USB mic, you can ensure that the Pi recognizes it by typing<span style="font-family:courier new,courier,monospace;"> lsusb</span> at the command line</span></span>
+<span style="font-size:medium;"><span style="font-size:small;">In order to record audio, we need to connect a microphone to the Pi. If you connect a USB mic, you can ensure that the Pi recognizes it by typing<span style="font-family:courier new,courier,monospace;">lsusb</span> at the command line</span></span>
 <code>pi@raspberrypi ~ $ lsusb<br/>Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.<br/>Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub<br/>Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.<br/>Bus 001 Device 004: ID 0000:0538<br/>Bus 001 Device 006: ID 0d8c:013c C-Media Electronics, Inc. CM108 Audio Controller<br/>Bus 001 Device 005: ID 1c4f:0002 SiGma Micro Keyboard TRACER Gamma Ivory</code>
@@ Line 11: / Line 11: @@
 You can obtain the device details by typing <span style="font-family:courier new,courier,monospace;">arecord -l</span>
-<code>
+<code>pi@raspberrypi ~ $ arecord -l</code>
-pi@raspberrypi ~ $ arecord -l<br>
-**** List of CAPTURE Hardware Devices ****<br>
+****&nbsp;<code>List of CAPTURE Hardware Devices ****</code>
-card 1: Device [USB PnP Sound Device], device 0: USB Audio [USB Audio]<br>
-  Subdevices: 1/1<br>
+<code>card 1: Device [USB PnP Sound Device], device 0: USB Audio [USB Audio]</code>
-  Subdevice #0: subdevice #0<br>
-</code>
+ <code> Subdevices: 1/1