Bandpass audio signal

An audio signal is intercepted. It is known that the signal includes double-side band suppressed carrier modulation. It is known that the target channel uses carrier frequency as 4000Hz with a bandwidth of 1500Hz.

More mathematically, a bandpass signal is formulated as:

$s(t)=m(t)cos(2\pi f_{c}t)$

In such a case there is a single channel broadcasting the message $m(t)$ at carrier frequency $f_c$

In case of multiple channels broadcasting it becomes:

$s(t)=m_1(t)cos(2\pi f_{1}t)+m_2(t)cos(2\pi f_{2}t)+...$

So, given $s(t)$ as this audio signal (original attachment unavailable), can you recover $m(t)$ within the bandwidth [2500Hz-5500Hz]?

Please provide the keyword you hear in lower case.