| 摘要 |
<p>A data transmission system arranged to transmit data over a speech transmission system comprises a transmitter (10) having a modulator (18) which converts the data to a speech-like signal having at least one speech-like characteristic defined by at least one parameter, and a speech compression module (20) which converts the speech-like signal to digital compressed speech format. A receiver (14) includes a speech decompression module (26) and a demodulator (28) which converts the speech-like signals back to the original data by analysing the parameters. If a digital speech compression link is used on either the end uplink or end downlink part of the communications path, the data may be mapped directly onto the compressed speech bit stream or recovered from the bit stream respectively.</p> |
