| 摘要 |
<p> Described is a transmission system (20) comprising a transmitter (22) for transmitting a NARROWBAND speech signal, e.g. bandwidth limited between 300 and 3400 Hz, to a receiver (24) via a transmission channel (26). The transmission system (20) is characterized in that the transmitter (22) or the receiver (24) comprise amplifying means (28,30,32,34,36,38) for enhancing a listener's perception of low-frequency speech signal components by amplifying a frequency band of the NARROWBAND speech signal. The frequency band may contain frequencies in the range of 300-450 Hz. The amplifying means (28,30,32,34,36,38) may comprise a band pass filter (28,34) for deriving the frequency band from the NARROWBAND speech signal and an amplifier (30,36) for amplifying the frequency band. The amplification of the frequency band gives a reinforced perception of frequency components below the NARROWBAND speech signal (e.g. 50-300 Hz), compensating for the lack of the physical presence of these components.</p> |
