Terminal Device Audio Signal Identification Extraction

The patent applies universality by enabling sound emitting devices to serve dual functions: providing voice guidance information and transmitting identification codes simultaneously. This eliminates the need for separate dedicated communication equipment, as existing audio playback devices can now perform both information delivery and identification transmission roles, thereby reducing system complexity and cost.

The patent substitutes the mechanical/electronic communication system (radio waves, infrared rays requiring specialized transmitters and receivers) with an acoustic system using sound waves. By embedding identification codes within audio signals that are already being played for voice guidance, the system replaces complex wireless communication infrastructure with simple sound emission and reception capabilities that are already present in standard audio devices.

The patent makes existing sound emitting devices universal by enabling them to transmit identification information alongside voice guidance. This multi-functionality approach ensures reliable information delivery without requiring visitors to carry specialized receivers, as standard devices with sound playback capability can receive and process the embedded identification codes.

The system applies self-service by using the sound emitting devices themselves to transmit their own identification information. The devices that provide the voice guidance automatically embed and transmit their unique identification codes within the audio output, eliminating the need for separate transmission equipment and enabling self-identification without external communication infrastructure.

The patent achieves versatility through universality by enabling any sound emitting device to function as an identification transmitter. This allows the system to work with a wide variety of existing audio devices without requiring specialized equipment, thereby maintaining adaptability across different exhibits and visitor devices while significantly reducing system complexity and cost.

The patent uses copying by embedding the identification code information within the existing audio signal that is already being transmitted for voice guidance. Rather than creating a separate communication channel, the system copies the identification data into the audio waveform, allowing it to be transmitted along with the guidance information through the same channel and equipment.