Active Noise ReductionActive Noise Reduction (ANR) is the function to cancel the noise component of the collected audio in order to improvethe transmitted audio quality.The noise cancellation function can be collectively configured according to the usage environment. Also, selecting “Custom”enables the detailed configuration of the noise cancellation function.Table 6-22 ANR PresetANR Preset DescriptionOff The noise cancellation characteristics cannot be configured.Light Reduces the background noise. Reduces the background noise less effectively than “Standard”. On an analogchannel, the effect of the background noise reduction is the same as when “Off” is configured.Standard Reduces the background noise. Assuming a variety of environments, this configuration is for notdeteriorating audio.PowerfulReduces the background noise more effectively than “Standard”. Audio may be slightlysuppressed. Also, since the position of the microphone is being detected even while nottransmitting, this configuration is suitable for a user using the transceiver in a noisy environmentor with the microphone on the shoulder.ProfessionalReduces the background noise. This configuration reduces noise of a specific environment, suchas a siren, and is also harmless to audio.The optimal noise cancellation effect is available by having the mouth of a transmitting user andthe microphone positioned at an appropriate distance when the transceiver is used. Thisconfiguration is suitable for use in a fire department and a police station.CustomThe following various functions of noise cancellation can be configured:Vocoder:In Vocoder, whether the transceiver transmits on a digital channel with or without reducing andeliminating the noise component of the background noise can be configured. If the transceiver isused in a noisy environment, enabling this function allows the transceiver to transmit by reducingand eliminating the noise components in the background noise, so that the noise at the receivingtransceiver is eliminated or reduced. However, a part of the voice component is also reduced, andthis reduction may cause the received audio to be fuzzy. In such case, disabling this function resultsin the transmitted audio resembling an analog voice signal, so the audio on the receiving transceivermay sound natural.DSP:In DSP, whether to reduce and eliminate the background noise or not while transmitting can beconfigured. This configuration can be configured according to the situation of the background noiseor usage environment. Using a microphone consisting of 2 microphones can be more effective.Noise Attenuation Level:In Noise Attenuation Level, the amount of noise reduction can be configured. The standardconfiguration is 0 dB, and the sound quality is balanced with the amount of noise reduction. If -20 dBis configured, the noise can be most effectively reduced while the sound quality degrades more easily.If +10 dB is configured, the noise is least effectively reduced while the sound quality degrades less.Low Noise Level Adjustment:In Low Noise Level Adjustment, whether to stop the noise cancellation process automatically inan environment where background noise is low can be configured. If this function is enabled, thedegradation of sound quality can be prevented in an environment where background noise is low.Optimization based on Microphone Position (Portable only):Whether to optimize the noise cancellation process according to the positional relationship of themicrophone and the mouth of a user can be configured. If this function is enabled, the positionalrelationship of the microphone and the mouth is detected and the noise cancellation process isoptimized. This function is effective when the microphone is not held stable by a user or unable tobe used in front of the mouth. If this function is disabled, the noise cancellation process is notoptimized according to the microphone position. However, if the microphone is used in front of themouth, optimized noise cancellation is available. This function is valid when an internal microphoneor KMC-54 is used.Siren:In Siren, whether to remove the siren audio component when a siren audio is detected can beconfigured.6 SOUND6.7 Configuring Audio Profile (Audio Profile)Common FUNC (K, F)/Ver 2.20 136CONTENTS INDEX
