8.6 Configure the settings relating to audio [Audio]
Click the [Audio] tab on the “Image/Audio” page. (→6.1 How to display the setup menu, 6.2 How to operate the setup menu)
The settings relating to audio can be configured on this page.
Note
Images and audio will not be synchronized. Therefore, images and audio may not always match.
Audio may be interrupted depending on the network environment.
[Audio transmission/reception]
Select the communication mode used for audio data transmission/reception between the camera and the PC from the following.
Off: Does not receive/transmit audio between the camera and the PC. Therefore, the settings and controls relating to audio will be invalidated.
Mic input: The PC receives audio data from the camera. Audio can be heard with images on the PC. Images and audio will not be synchronized.
Audio output: Audio data from the PC will be transmitted to the camera. Audio can be heard from the speaker connected to the camera.
Interactive(Half-duplex): Both reception and transmission are available. However, audio data cannot simultaneously be transmitted and received.
Interactive(Full-duplex): Both reception and transmission are simultaneously available.
Default: Off
Note
Howling may be generated depending on usage conditions. If howling is generated, prevent sound generated by the PC from entering the PC microphone.
When “Multicast” is selected for “Transmission type” on the [JPEG/H.264] tab of the “Image/Audio” page, “Audio output” will become unavailable while monitoring H.264 images. To enable “Audio output”, click the [JPEG] button on the “Live” page.
“Audio detection” only operates when “Mic input” or “Interactive(Full-duplex)” is selected for “Audio transmission/reception”.
[Audio encoding format]
Select the audio reception encoding format from G.726, G.711, AAC-LC and AAC-LC (HIGH QUALITY).
Default: G.726
IMPORTANT
When “AAC-LC (HIGH QUALITY)” is selected, there are limitations about the following function.
“Audio detection” is not available.
HTTPS is not available.
The maximum concurrent access number is limited to 5.
[Audio bit rate]
Select the audio bit rate used to transmit/receive audio data.
When G.726 is selected for “Audio encoding format” : 16kbps/ 32kbps
When AAC-LC (HIGH QUALITY) is selected for “Audio encoding format” : 64kbps/ 96kbps/ 128kbps
Default:
When “G.726” is selected : 32kbps
When “AAC-LC (HIGH QUALITY)” is selected : 128kbps
Note
When selecting a smaller value for “Bandwidth control(bit rate)” (→12.1 Configure the network settings [Network]) while putting a priority on the JPEG image and H.264 image transmission, select “16kbps” for “Audio bit rate”.
[Audio bit rate] is unavailable when “G.711” or “AAC-LC” is selected for “Audio encoding format”.
[Mic input volume (Camera to PC)]
Select a volume level on the PC to hear audio transmitted from the camera.
Line High: The volume level will become high.
Line Middle: The volume level will become middle.
Line Low: The volume level will become low.
Default: Line Middle
Note
These settings are linked with the volume settings of “Audio detection”.
[AGC (audio)]
Automatically adjusts the audio reception to a suitable volume. The degree to which the volume is adjusted can be selected from High/Middle/Low.
When “High” is selected, it is easier to hear quiet sounds, but sounds may be heard as noise. If you do not want to hear noise, select “Middle” or “Low”.
Default: High
Note
This setting is also applied to the volume for [Audio detection].
The audio is only for line input.
IMPORTANT
If the [AGC (audio)] setting is changed after configuring [Audio detection], the volume of the sound that is detected with [Audio detection] may change. In this case, make sure to check the [Audio detection] setting.
[Mic input interval (Camera to PC)]
Select an interval for audio reception from the following.
20ms/ 40ms/ 80ms/ 160ms
Default: 40ms
Note
When a shorter interval is selected, the delay time will be shorter. When a longer interval is selected, audio interruption may be diminished even though the delay time will be longer. Select the interval according to the network environment.
“Mic input interval (Camera to PC)” is unavailable when “AAC-LC” or "AAC-LC (HIGH QUALITY)" is selected for “Audio encoding format”.
[Audio output volume (PC to Camera)]
Select a volume level on the camera to hear audio transmitted from the PC.
High/Middle/Low
Default: Middle
[Audio output interval (PC to Camera)]
Select an interval for audio transmission from the following.
160ms/320ms/640ms/1280ms
Default: 640ms
Note
When a shorter interval is selected, the delay time will be shorter. When a longer interval is selected, audio interruption may be diminished even though the delay time will be longer. Select the interval according to the network environment.
Audio may temporarily be interrupted and noise may be heard when multiple users are accessing the camera concurrently. It may be possible to diminish the interruption or noise by setting a longer interval for “Audio output interval (PC to Camera)”.
Audio may sometimes not be heard depending on the network environment.
[Audio output duration]
Configure the maximum duration for each time audio is outputted.
1min/2min/3min/5min/10min/20min/30min/1h
Default: 5min
Note
Audio output stops when the specified time has passed. To turn the audio transmission function on, click the Audio output button again.
[Audio output port (PC to Camera)]
Enter the transmission port number (the port number on the camera used to receive audio data transmitted from the PC).
Available port number: 1024 to 50000 (Only even numbers are available.)
Default: 34004
Note
The transmission port number entered for “Audio output port (PC to Camera)” will be used only when “Unicast port (MANUAL)” is selected for “Transmission type” ([Transmission type]). When “Off” is selected for “H.264 transmission” ([H.264 transmission]) or when “Unicast port (AUTO)” or “Multicast” is selected for “Transmission type”, it is not necessary to enter the transmission port number.
[Permission level of audio trans./recep.]
Select an access level for audio reception from the following.
1. Level 1 only/ 2. Level 2 or higher/ 3. All users
Default: 3. All users
Note
Refer to Section 11 Configure the settings relating to the authentication [User mng.] for further information about the access level.