TH18334B - Radio receiver with NICAM or DAB decoder - Google Patents

Abstract

Broadcast receiver with circuit (1) for automatic gain control (Fetting control circuit) with decoder (16) for decoding of DAB (Diqital Audio Broadcasting) or NICAM- (NearInstantaneous Companded Audio Multiplex) audio signals, splitter (17) for separation of audio signals. Modulated PSK (Phase Shift Keying) or QPSK (Quadrature PSK) or DQPSK (Differential OPSK), which is defined in such a way that the circuit (1) for controlling amplification values is provided in the path through the audio signal. That are encoded numerically On the source side from the splitter (17) (Fig. 5) and the regulator voltage variable for controlling the amplification can be derived from one or more outputs (O / I) of the splitter. signal

Claims (3)

1. TV or radio receiver with an intermediate frequency amplification path (1, 23) with automatic gain control and a junction with an audio splitter. Which the audio splitter As a digital splitter (17,19,19a, 19b, 20) for PSK or QPSK or DPSK reception, which is characterized by automatic gain control. For the intermediate frequency amplification path (1,23) and for the automatic gain control of the unit, the modulator or amplification circuit (22) is generated from the output or signal (I, Q) of the splitter. That digital signal (17,19, 19a, 19b, 20) 2. TV or radio receiver according to claim 1, which is unique to that digital splitter (17,19,19a, 20) is a NICAM or DAB splitter. 3. Television or radio receiver in accordance with either 1 or 2 claim Which are unique to that digital splitter (17,19,19a, 19b, 20) There are two phase signals (I, Q), each of which is squared (19a, 19b) and added together (20) to form a signal. Control the value for signal amplification.