Broadcast receiver

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Using the antenna 1, a sterophonic broadcast signal is received, the two audio signals of which for the right-hand and left-hand sound channel are optionally subjected or not subjected to dynamic compression at the transmitter end.
The received signal is processed in the tuner 2 and supplied to the decoder 3 which delivers the two audio signals R for the right-hand sound channel and L for the left-hand sound channel or also the L+R and L-R signals.
These signals are supplied to the recorder 8 for recording.
If no dynamic compression has yet been performed in the signal at the transmitter end, a signal compression is necessary or advantageous in the recording with the recorder 8.
If dynamic compression has already been carried out at the transmitter end, further compression at the receiver end would be superfluous or even disadvantageous.
The signal from the output of tuner 2 is now additionally supplied to the analysing circuit 4.
The circuit 4 also decodes the signal and determines the respective so-called scale factor.
Depending on the scale factor, the switching voltage Us is generated which passes as switching voltage to the change-over switch 7.
When the analysing circuit 4 finds by means of the scale factors that no compression has yet been performed at the transmitting end, it generates a switching voltage having the value 0 which places the change-over switch 7 into its above position.
As a result, the dynamic compressors 5a and 5b are inserted into the signal paths for R and L.
These effect a dynamic compression of signals R and L for the recording in order to improve by this means the signal-to-noise ratio during replay.
When it is found in the analysing circuit 4 by means of the scale factors that dynamic compression has already been carried out at the transmitting end, the switching voltage Us assumes the value 1.
As a result, the change-over switch 7 is switched to its lower position.
The compressors 5a and 5b are then switched off so that no additional compression of the signals R and L is carried out in required manner in the receiver