Audio amplifier arrangement having a volume dependent tone control

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention will be further described with reference to FIGS.
2 and 3.
The previously mentioned embodiments can be recognized in the embodiment of FIG.
3.
FIG.
2 shows a television apparatus 6 including an audio amplifier arrangement 11 according to the invention.
The television apparatus 6 includes means 8 for obtaining a baseband video and audio signal from a modulated carrier selected for this purpose, which carrier is applied to an input 7.
The means 8 are further coupled to two different devices, viz.
to a video signal amplifier 9 for controlling a display tube 10 and to the audio amplifier arrangement 11 for controlling a loudspeaker 12.
The transfer of the audio amplifier arrangement 11 is also adjustable by means of an operating unit 13.
The operating unit 13 may be, for example a receiver for signals from a remote control unit which supplies control signals to the means 8 and the devices 9 and 11.
FIG.
3 shows an embodiment of the audio amplifier arrangement 11.
In this arrangement components which are not important for understanding the invention, such as, for example DC bias components are omitted.
The afore-mentioned baseband audio signal originating from the means 8 is applied to an input terminal 19.
The signal path successively incorporates a filtering device 20 and an amplifier stage 30, with output terminals 32 and 33.
The loudspeaker 12 is coupled to these output terminals between which the amplifier stage 30 supplies a bipolar output signal.
The gain factor of the amplifier stage 30 is continuously controllable by means of a voltage applied to the terminal 39.
The amplifier stage 30 may be, for example an integrated circuit of the type "TDA7056A".
The low-pass slope of the filtering device 20 is adjustable by means of a control signal at the terminal 29, which signal may be derived from a "loudness" or "bass-boost" key on a remote control unit.
The signals at the terminals 29 and 39 originate from the operating unit 13