Driving of multi-channel speakers

摘要

A drive system comprises a splitter (107) which generates a low frequency signal and high frequency signal from an input signal. A first drive circuit (111, 115) is coupled to the splitter (107) and generates a drive signal for an audio driver (105) from the low frequency signal. A second drive circuit (117, 119) is coupled to the splitter (117) and generates a drive signal for a second audio driver (101) from the high frequency signal. The second drive circuit (117, 119) provides a bass frequency extension for the second audio driver (101) by applying low frequency boost to the low frequency signal. A processor (125) determines a driver excursion indication for the second audio driver (101) and a controller (127) performs a combined adjustment of a cross-over frequency for the high and low frequency signals and a characteristic of the low frequency boost based on the driver excursion indication. The invention may provide improved interworking between e.g. a subwoofer and satellite speakers.

主权项

1. A drive system for generating drive signals for audio drivers, the drive system comprising:
a splitter (107) for generating a first signal and a second signal from an input signal, wherein
the first signal comprises signal components of a first frequency interval of the input signal and the second signal comprises signal components of a second frequency interval of the input signal,the first and second frequency intervals having a cross-over frequency and the first frequency interval corresponding to lower frequencies than the second frequency interval; a first drive circuit (111, 115) coupled to the splitter (107) and arranged to generate a first drive signal for a first audio driver (105) from the first signal; a second drive circuit (117, 119) coupled to the splitter (107) and arranged to generate a second drive signal for a second audio driver (101) from the second signal; means (125) for determining a driver excursion indication for the second audio driver (101); means (117) for providing a bass frequency extension for the second audio driver (101) by applying low frequency boost to the second signal,
wherein the low frequency boost provides increased gain above an original maximum gain value for frequencies of the second signal within a first frequency band of the second frequency interval relative to frequencies of the second frequency band above the first frequency band; and adjustment means (127) for performing a combined adjustment of the cross-over frequency and a characteristic of the low frequency boost in response to the driver excursion indication.