A method is provided for extending the frequency band of an audio signal during a decoding or improvement process. The method includes obtaining the decoded signal in a first frequency band, referred to as a low band. Tonal components and a surround signal are extracted from the signal from the low-band signal, and the tonal components and the surround signal are combined by adaptive mixing using energy-level control factors to obtain an audio signal, referred to as a combined signal. The low-band decoded signal before the extraction step or the combined signal after the combination step are extended over at least one second frequency band which is higher than the first frequency band. Also proved are a frequency-band extension device which implements the described method and a decoder including a device of this type.

A method is provided for extending the frequency band of an audio signal during a decoding or improvement process. The method includes obtaining the decoded signal in a first frequency band, referred to as a low band. Tonal components and a surround signal are extracted from the signal from the low-band signal, and the tonal components and the surround signal are combined by adaptive mixing using energy-level control factors to obtain an audio signal, referred to as a combined signal. The low-band decoded signal before the extraction step or the combined signal after the combination step are extended over at least one second frequency band which is higher than the first frequency band. Also proved are a frequency-band extension device which implements the described method and a decoder including a device of this type.

A method is provided for extending the frequency band of an audio signal during a decoding or improvement process. The method includes obtaining the decoded signal in a first frequency band, referred to as a low band. Tonal components and a surround signal are extracted from the signal from the low-band signal, and the tonal components and the surround signal are combined by adaptive mixing using energy-level control factors to obtain an audio signal, referred to as a combined signal. The low-band decoded signal before the extraction step or the combined signal after the combination step are extended over at least one second frequency band which is higher than the first frequency band. Also proved are a frequency-band extension device which implements the described method and a decoder including a device of this type.

In some embodiments, a stamp comprising at least one stamping component and one stamping insert with a mounted band unit. The stamping component may comprise a top part and a bottom part with a cushion-receiving element. The mounted band unit may be connected so as to move synchronously via a reversing mechanism in the bottom part to the top part. In the resting position a text plate mounted on the stamping insert and a stamping area of the mounted band unit may abut against an ink pad soaked with ink in the cushion-receiving element. During a stamping process for producing a stamp impression the stamping insert can be shifted via the reversing mechanism into a stamping position. On the stamping insert, a height adjustment element for the mounted band unit and/or a text plate carrier may be provided.

In some embodiments, a stamp comprising at least one stamping component and one stamping insert with a mounted band unit. The stamping component may comprise a top part and a bottom part with a cushion-receiving element. The mounted band unit may be connected so as to move synchronously via a reversing mechanism in the bottom part to the top part. In the resting position a text plate mounted on the stamping insert and a stamping area of the mounted band unit may abut against an ink pad soaked with ink in the cushion-receiving element. During a stamping process for producing a stamp impression the stamping insert can be shifted via the reversing mechanism into a stamping position. On the stamping insert, a height adjustment element for the mounted band unit and/or a text plate carrier may be provided.

An integrated overprint colorful seal with multiple printing surfaces, comprising a seal housing (1), a middle frame (2) accommodated in the seal housing (1), a spring (3) squeezed between the seal housing and the middle frame, a seal body (4) in a regular triangular prism or a quadrangular prism shape, and a driving mechanism. Each side surface of the seal body (4) in the regular triangular prism or quadrangular prism shape is a printing surface (60) in a different color and the printing surface is overprinted on a target object to show a colorful seal pattern. The seal integrates the multiple printing surfaces in an integral whole, can implement semi-automatic overprint of three colors or four colors and is precise in overprint. The seal also supports printing surface replacement and ink-replenishment, and is easy to use and convenient to carry.

An integrated overprint colorful seal with multiple printing surfaces, comprising a seal housing (1), a middle frame (2) accommodated in the seal housing (1), a spring (3) squeezed between the seal housing and the middle frame, a seal body (4) in a regular triangular prism or a quadrangular prism shape, and a driving mechanism. Each side surface of the seal body (4) in the regular triangular prism or quadrangular prism shape is a printing surface (60) in a different color and the printing surface is overprinted on a target object to show a colorful seal pattern. The seal integrates the multiple printing surfaces in an integral whole, can implement semi-automatic overprint of three colors or four colors and is precise in overprint. The seal also supports printing surface replacement and ink-replenishment, and is easy to use and convenient to carry.

A method is provided for extending the frequency band of an audio signal during a decoding or improvement process. The method includes obtaining the decoded signal in a first frequency band, referred to as a low band. Tonal components and a surround signal are extracted from the signal from the low-band signal, and the tonal components and the surround signal are combined by adaptive mixing using energy-level control factors to obtain an audio signal, referred to as a combined signal. The low-band decoded signal before the extraction step or the combined signal after the combination step are extended over at least one second frequency band which is higher than the first frequency band. Also proved are a frequency-band extension device which implements the described method and a decoder including a device of this type.

A self-inking stamp is configured such that, in a marking preparation state, a marking member is maintained in a state in which it is oriented upwardly within a stamp body of the self-inking stamp and pressed against an ink pad to supply ink thereto, and, during a marking operation, after the inner frame is moved downwardly while being reversingly rotated and oriented downwardly, the downwardly-oriented marking member is exposed from the stamp body and enabled to make a mark. The self-inking stamp is also configured to lock the marking member in a state in which it is exposed from the stamp body, for replacement and cleaning of the marking member.

A self-inking stamp is configured such that, in a marking preparation state, a marking member is maintained in a state in which it is oriented upwardly within a stamp body of the self-inking stamp and pressed against an ink pad to supply ink thereto, and, during a marking operation, after the inner frame is moved downwardly while being reversingly rotated and oriented downwardly, the downwardly-oriented marking member is exposed from the stamp body and enabled to make a mark. The self-inking stamp is also configured to lock the marking member in a state in which it is exposed from the stamp body, for replacement and cleaning of the marking member.