Voice Speed Up/Slow Down

The Gong System has the ability to let users change the playing speed of a voice message. For example:

  • One may want to better understand a speech by playing it slowly.
  • One may want to quickly browse the messages by playing them quickly.

The message can be played at different speeds without affecting the pitch of the speech. The following image shows the interface for changing the speed of the message.

Speed Up/Slow Down Interface
The Interface for Adjusting the Playback Speed

The speed can be adjusted using the slider at the top. For example, moving the slider slightly to the left gives a slight decrease in speed. Similarly, the speed would be increased slightly if the slider is slightly moved in the opposite direction. Instead of showing exact value of the timing of the speed, the system gives an approximate speed of very slow speed, slow speed, normal speed, fast speed and very fast speed. Right at the start, the playback speed is set to its natural speed. If the playback speed is changed, a user can easily revert to the normal speed by pressing the button on the right.

So, when the slider is at this state, the voice recording is played without being sped up or slowed down:

Normal Playback Speed
Message Played at the Normal Speed

When the slider is moved to the left, the voice recording is played slower:

Slower Playback Speed
Message Played at a Very Slow Speed

When the slider is moved to the right, the voice recording is played at a faster speed:

Faster Playback Speed
Message Played at a Very Fast Speed

Speed Up/Slow Down in Words per Minute

The playback speed of any message can be changed in the Gong System. Moreover, if the text of the message and its word alignment information is available, the playback speed is expressed in a "Words per Minute" measure. This value is calculated based on the duration of the voice message and the number of words in the text.

In the following example this particular voice message has 168 words per minute.

Normal Playback Speed in Words per Minute
Message Played at its Natural Speed (168 words per minute)

To change the speed, the user can move the slider to the left or to the right. The speed would be indicated by the words per minute number. For example, the image below shows a speed of 118 words per minute which is slower than the natural speed of 168 words per minute.

Slower Playback Speed in Words per Minute
Message Played at a Slower Speed (118 words per minute)

Similarly, moving the slider to the right makes the message play faster. In the following example, it is played at a speed of 212 words per minute.

Faster Playback Speed in Words per Minute
Message Played at a Faster Speed (212 words per minute)