11.10 Configure the settings relating to audio [Audio]
The settings relating to audio can be configured on this page.
Note
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Images and audio will not be synchronized. Therefore, images and audio may not always match.
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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.
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Off: Does not receive/transmit audio between the camera and the PC. Therefore, the settings and controls relating to audio will be invalidated.
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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.
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Audio output: Audio data from the PC will be transmitted to the camera. Audio can be heard from the speaker connected to the camera.
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Interactive(Half-duplex): Both reception and transmission are available. However, audio data cannot simultaneously be transmitted and received.
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Interactive(Full-duplex): Both reception and transmission are simultaneously available.
Note
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Howling may be generated depending on usage conditions. If howling is generated, prevent sound generated by the PC from entering the PC microphone.
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When “Multicast” is selected for “Transmission type” on the [JPEG/H.264] tab of the “Image/Audio” page, audio transmission will become unavailable while monitoring H.264 images. To transmit audio from a PC to the camera, click the [JPEG] button on the “Live” page.
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The “Audio recording” function only operates when “Mic input” or “Interactive(Full-duplex)” is selected for “Audio transmission/reception”.
[Mic select]

“Mic select” can only be configured when “Mic input”, “Interactive(Half-duplex)”, or “Interactive(Full-duplex)” is selected for “Audio transmission/reception”.
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Internal: The camera’s built-in mic is used.
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External: Uses the audio inputted from the mic or the line input terminal. An audio cable (accessory) must be connected to the audio cable connector.
[Audio encoding format]
Select the audio reception encoding format from G.726, G.711, and AAC-LC.
Note
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G.711 is available only when “Mic input” is selected for “Audio transmission/reception”.
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G.726 is always applied for the audio transmission encoding format.
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AAC-LC is used for mic audio saved on SD memory cards. The default bit rate setting is 64kbps. After selecting AAC-LC, the specified bit rate setting will be used.
[Audio bit rate]
Select the audio bit rate used to transmit/receive audio data.
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When “G.726” is selected for “Audio encoding format”: 16kbps/32kbps
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When “G.711” is selected for “Audio encoding format”: cannot be selected
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When “AAC-LC” is selected for “Audio encoding format”: 64kbps/96kbps/128kbps
[Mic input volume (Camera to PC)]
Select a volume level on the PC to hear audio transmitted from the camera.
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Mic High: The volume level will become high. This setting will be applied when audio is input to the camera using a microphone.
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Mic Middle: The volume level will become middle. This setting will be applied when audio is input to the camera using a microphone.
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Mic Low: The volume level will become low. This setting will be applied when audio is input to the camera using a microphone.
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Line High: The volume level will become high. This setting will be applied when audio is input to the camera using the Line input.
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Line Middle: The volume level will become middle. This setting will be applied when audio is input to the camera using the Line input.
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Line Low: The volume level will become low. This setting will be applied when audio is input to the camera using the Line input.
Note
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These settings are linked with the volume settings of the “Audio recording” function.
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When “Internal” is selected for “Mic select”, “Line High”, “Line Middle”, and “Line Low” cannot be selected.
[Mic input interval (Camera to PC)]
Select an interval for audio reception from the following.
20ms/ 40ms/ 80ms/ 160ms
Note
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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.
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“Mic input interval (Camera to PC)” is unavailable when “AAC-LC” 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
[Audio output interval (PC to Camera)]
Select an interval for audio transmission from the following.
160ms/ 320ms/ 640ms/ 1280ms
Note
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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.
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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)”.
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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
Note
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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).
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Available port number: 1024-50000 (Only even numbers are available.)
[Permission level of audio trans./recep.]
Select an access level for audio transmission/reception from the following.
1. Level 1 only/ 2. Level 2 or higher/ 3. All users