Regeneration of wideband speech

A computing system, comprising:

• a memory, operable to host data for a narrowband speech signal, the narrowband speech signal being generated from a wideband speech signal;
• a processor, operably coupled to the memory, the processor to execute instructions that cause the processor to:
• receive samples of a narrowband speech signal having a first range of frequencies, wherein a first portion of a range of frequencies in a wideband speech signal is represented in the narrowband speech signal;
• identify, based on a characteristic of the narrowband speech signal, frequencies in the first range of frequencies to translate into a target band of a regenerated speech signal, the characteristic being determined from a pitch-dependent spectral translation as approximating a harmonic structure in a second portion of the range of frequencies in the wideband speech signal, wherein the second portion of the range of frequencies is excluded from being represented in the narrowband speech signal;
• modulate the identified frequencies in the first range of frequencies of the received samples of the narrowband speech signal with a modulation signal, the modulation signal having a modulating frequency adapted to upshift the identified frequencies in the first range of frequencies into the target band;
• filter the modulated samples, using a target band filter, to form the regenerated speech signal in the target band;
• and
• combine the narrowband speech signal with the regenerated speech signal to produce a new wideband speech signal.

A machine-readable storage device, excluding a transitory propagating signal, the storage device comprising instructions for execution by a processor of the machine, wherein the instructions, when executed, cause the processor to perform operations comprising:

• obtaining samples of a narrowband speech signal having a first range of frequencies, wherein a first portion of a range of frequencies in a wideband speech signal is represented in the narrowband speech signal;
• identifying, based on a characteristic of the narrowband speech signal, frequencies in the first range of frequencies to translate into a target band of a regenerated speech signal, the characteristic being determined from a pitch-dependent spectral translation as approximating a harmonic structure in a second portion of the range of frequencies in the wideband speech signal, wherein the second portion of the range of frequencies is excluded from being represented in the narrowband speech signal;
• modulating the identified frequencies in the first range of frequencies of the obtained samples of the narrowband speech signal with a modulation signal, the modulation signal having a modulating frequency adapted to upshift the identified frequencies in the first range of frequencies into the target band;
• filtering the modulated samples, using a target band filter, to form the regenerated speech signal in the target band;
• and
• combining the narrowband speech signal with the regenerated speech signal to produce a new wideband speech signal.