| 摘要 |
PURPOSE:To remove higher harmonic from respective D/A converted modes by LPFs having the same disconnecting frequency by converting sampling frequency into the least common multiple of each mode at the reception of two or more digital signals having differnt sampling frequency. CONSTITUTION:In a satellite broadcasting receiver having an A mode of 15kHz band width and 4 channels (CH) and a B mode of 20kHz and 2 channels for a voice signal and setting up respective sampling frequencies to 32kHz and 48kHz, an PCM input signal is inputted to a function block 1 having functions such as PCM decodin and A/B mode detection. A signal from the block 1 is inputted to a data interpolation part 3 through an error data interpolation circuit 2. The interpolation part 3 converts the sampling frequencies into the least common multiple, i.e. 96kHz, of both A and B modes, allows a D/A converter 4 to convert its output signal with said frequency and sends a CH identifying code and clock signals of the A and B modes to a deglitch circuit 5 in accordance with an A/D mode switching signal. The circuit 5 distributes the analog signal in each mode and removes higher harmonic by the LPFs 6 having the same disconnection frequency to output the harmonic-removed signals. |
