A voice synthesis device comprising: a plurality of detection nodes configured to detect voice signals, and an aggregation node configured to receive the voice signals sent by the plurality of detection nodes, to determine whether each of the plurality of detection nodes is trusted, and to synthesize the voice signals sent by the detection nodes which are determined to be trusted to obtain synthesized voice signal; characterized in that: each of the plurality of detection nodes is further configured to send a feedback signal to the aggregation node in response to receiving a broadcast signal sent by the aggregation node, and wherein the aggregation node is further configured to send the broadcast signal to the plurality of detection nodes, to determine a trust degree for each of the detection nodes in response to receiving the feedback signal from each of the plurality of detection nodes, and to determine whether each of the plurality of detection nodes is trusted based on its trust degree; wherein the trust degree for the detection nodes is determined as: K i t = Y i t − 1 n ∑ i = 1 n Y i t 1 n ∑ i = 1 n Y i t, wherein K i ( t) denotes the trust degree for a detection node i at time t, n denotes the number of the plurality of detection nodes, and Y i ( t) denotes a voice signal detected by the detection node i at time t, as the feedback signal; wherein the trust degree is compared with a predefined threshold, and wherein, in response to the trust degree K i ( t) being greater than or equal to the predefined threshold, it is determined that the detection node i is untrusted at time t, and in response to the trust degree K i ( t) being smaller than the predefined threshold, it is determined that the detection node i is trusted at time t. a plurality of detection nodes configured to detect voice signals, and an aggregation node configured to receive the voice signals sent by the plurality of detection nodes, to determine whether each of the plurality of detection nodes is trusted, and to synthesize the voice signals sent by the detection nodes which are determined to be trusted to obtain synthesized voice signal; characterized in that: each of the plurality of detection nodes is further configured to send a feedback signal to the aggregation node in response to receiving a broadcast signal sent by the aggregation node, and wherein the aggregation node is further configured to send the broadcast signal to the plurality of detection nodes, to determine a trust degree for each of the detection nodes in response to receiving the feedback signal from each of the plurality of detection nodes, and to determine whether each of the plurality of detection nodes is trusted based on its trust degree; wherein the trust degree for the detection nodes is determined as: K i t = Y i t − 1 n ∑ i = 1 n Y i t 1 n ∑ i = 1 n Y i t, wherein K i ( t) denotes the trust degree for a detection node i at time t, n denotes the number of the plurality of detection nodes, and Y i ( t) denotes a voice signal detected by the detection node i at time t, as the feedback signal; wherein the trust degree is compared with a predefined threshold, and wherein, in response to the trust degree K i ( t) being greater than or equal to the predefined threshold, it is determined that the detection node i is untrusted at time t, and in response to the trust degree K i ( t) being smaller than the predefined threshold, it is determined that the detection node i is trusted at time t. each of the plurality of detection nodes is further configured to send a feedback signal to the aggregation node in response to receiving a broadcast signal sent by the aggregation node, and wherein the aggregation node is further configured to send the broadcast signal to the plurality of detection nodes, to determine a trust degree for each of the detection nodes in response to receiving the feedback signal from each of the plurality of detection nodes, and to determine whether each of the plurality of detection nodes is trusted based on its trust degree; wherein the trust degree for the detection nodes is determined as: K i t = Y i t − 1 n ∑ i = 1 n Y i t 1 n ∑ i = 1 n Y i t, wherein K i ( t) denotes the trust degree for a detection node i at time t, n denotes the number of the plurality of detection nodes, and Y i ( t) denotes a voice signal detected by the detection node i at time t, as the feedback signal; wherein the trust degree is compared with a predefined threshold, and wherein, in response to the trust degree K i ( t) being greater than or equal to the predefined threshold, it is determined that the detection node i is untrusted at time t, and in response to the trust degree K i ( t) being smaller than the predefined threshold, it is determined that the detection node i is trusted at time t.