Then, results of comparison between the determined volume and a volume predetermined as a target volume are notified.

The sound volume button (25a) and the sound volume button (25b) functionally constituting a pair are separated.

automatic control of programme loudness

Loudness control systems may also produce undesirable audio effects when content shifts from a high overall loudness level to a lower overall loudness level.

Such loudness drops may be detected, and the loudness control system may be adjusted to minimize the undesirable effects during the transition between loudness levels.

standard reference loudness tape

A noise amount calculation procedure calculates, based on the calculated color differences, an amount of noise in the region to be evaluated.

The purpose of the invention is to appropriately calculate an amount of noise.

Noise Magnitude: Controls the amount and size of random noise

Loudness control systems or methods may normalize audio signals to a predetermined loudness level.

The sound level at the output of a radio receiving device is controlled, within the range which is set by a user, proportionally to the initial loudness changes.

When the sound volume of the speaker (23) is large, the amplifier apparatus raises the drive voltage of the speaker (23) to suppress the distortion of the sound volume.

A data signal containing settings for configuring the loudness controller is used for selectively controlling the operations of the loudness controller.

Buzzer volume control (56) is provided.

The volume level is also increased during each traffic announcement.