Bild

Siemens Stiftung

Speech signal - individual word

Chart:
Screenshot of the oscillographic curve of the spoken word "dogs".

Speech sounds are fluctuating sound signals where the composition of frequencies changes all the time.
Aperiodical overlap periodical parts. Unlike noises, some of which have similar frequency curves, sound in speech is always the carrier of meaning or of messages sent out by the speaker. Other noises like smacking of lips, hissing, rhythms, basic pitch are typical of the individual (acoustic fingerprint) but not essential for the speech content!

Information and ideas:
Supplementary to worksheets and transparencies.

Relevant for teaching:
Sound/acoustics: parameters
Vibrations and waves
Communication and understanding

Bild

Siemens Stiftung

Speech recognition sentence - syllable - phoneme

Chart:
The components of speech, from phoneme to sentence presented visually.

The graphic shows the oscilloscope curve of the spoken sentence "It?s raining cats and dogs" and excerpts from the units from which speech is composed: sentence, word, phoneme.

Information and ideas:
Speech recognition and speech synthesis are very topical themes in the field of information and communication technology.
Further information on this graphic is available as information sheet on the media portal of the Siemens Stiftung.

Relevant for teaching:
The human body
Structure and function of a sense organ
Reception of impulses and information transmission
Sensory perception

Bild

Siemens Stiftung

The Ear, Hearing and Hearing Impairment: Speech as highly complex sound signal

Graphic:
Oscillographic curve of the spoken sentence "It's raining cats and dogs".

Speech sounds are fluctuating sound signals where the composition of frequencies changes all the time.
Aperiodical overlap periodical parts. Unlike noises, some of which have similar frequency curves, sound in speech is always the carrier of meaning or of messages sent out by the speaker. Other noises like smacking of lips, hissing, rhythms, basic pitch are typical of the individual (acoustic fingerprint) but not essential for the speech content!

Information and ideas:
Supplementary to worksheets and transparencies.

Relevant for teaching:
Sound/acoustics: parameters
Vibrations and waves
Communication and understanding

Bild

Siemens Stiftung

Communication costs energy

Interactive graphic:
Overview of the annual energy requirement of communication with a smartphone

In modern communications, as with every form of communication, a message is sent from a transmitter via a channel to a receiver. A smartphone is used daily, to communicate, navigate via GPS, or call up information from the Web. In this context, the graphic shows devices and transmitters with their annual energy requirement in kilowatt-hours (kWh). Most users have little idea about the amounts of energy (particularly electric power) that are needed for this modern communications technology. Servers, for example, need energy for uninterrupted operation and for the required cooling of equipment.

Information and ideas:
This topic raises questions such as: How much energy is needed worldwide for mobile radio communications? What could this energy otherwise be used for?


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Audio

Siemens Stiftung

The Ear, Hearing and Hearing Impairment: Speech as highly complex sound signal

Recording:
A sentence spoken which also serves as an example of frequency-spectographical analysis in the topic "Types of sound".

Speech sounds are fluctuating sound signals where the composition of frequencies changes all the time.

Aperiodical overlap periodical parts. Unlike noises, some of which have similar frequency curves, sound in speech is always the carrier of meaning or of messages sent out by the speaker. Other noises like smacking of lips, hissing, rhythms, basic pitch are typical of the individual (acoustic fingerprint) but not essential for the speech content!

Information and ideas:
Supplementary to worksheets and transparencies.

Relevant for teaching:
Sound/acoustics: parameters
Vibrations and waves
Communication and understanding

Audio

Siemens Stiftung

Birdsong

Recording:
We often do not consciously perceive sounds in nature but we easily recognize birdsong.

Birdsong can reach a level of 40 decibels.

Information and ideas:
Recording to be identified by students or used for sound effects for a radio play/story.

Relevant for teaching:
Structure and function of a sensory organ
Senses discover the environment
Games to practise using the senses

Primärmaterial/Quelle

Siemens Stiftung

Morse alphabet

Web resource:
What is the Morse code and how is it interpreted? On this Website you will find the answer and an overview of all code values.


The Morse code translates the symbols of the Latin alphabet into an "alphabet" consisting of three signals: a short signal, a long signal and a pause. The information is created by the combination of signals and pauses. This code was developed for the telegraphic transmission of information in the first half of the 19th century. At the beginning of the 21st century it is hardly used any more. However, everyone knows of it because of the internationally understood distress call "SOS".

Information and ideas:
For further study for students and as a reference work for code values.

Primärmaterial/Quelle

Siemens Stiftung

ASCII code table

Web resource(s):
What is the ASCII code and how is it interpreted? On this Website you will find the answer as well as a summary of all code values in table form.


In order for texts to be processable in the computer they must be translated into the language of the computer (coded). The best known code for the Latin alphabet is the so-called ASCII code (American Standard Code for Information Interchange). This assigns a number to every letter and every figure as well as to every punctuation mark and control character.

Information and ideas:
For further study for students and as a reference work for code values.

Audio

Siemens Stiftung

Speech signal - individual word

Recording:
Individual word "dogs", which serves as example of frequency-spectographical analysis with the topic of "Types of sound".

Speech sounds are fluctuating sound signals where the composition of frequencies changes all the time.
Periodic parts are aperiodic parts overlapped. Unlike noises, some of which have similar frequency curves, sound in speech is always the carrier of meaning or of messages sent out by the speaker. Other noises like smacking of lips, hissing, rhythms, basic pitch are typical of the individual (acoustic fingerprint) but not essential for the speech content!

Information and ideas:
Supplementary to worksheets and transparencies.

Relevant for teaching:
Sound/acoustics: parameters
Vibrations and waves
Communication and understanding

Audio

Siemens Stiftung

The Ear, Hearing and Hearing Impairment;: Elephant trumpeting

Recording:
The trumpets of an elephant can be pretty loud! Example of loud sources of sound in nature.

Using their voice and their sense of hearing, elephants are able to communicate with each other over long distances.
Frightened elephants, elephants that are attacking something as well as elephants that are under attack all trumpet - and reach a sound level of between 85 and 90 decibels.
Such sounds enable elephants to communicate with each other over a distance of several kilometres.

Information and ideas:
Recording to be identified by students or used for sound effects for a radio play/story.

Relevant for teaching:
Structure and function of a sensory organ
Senses discover the environment
Games to practise using the senses
Acoustic phenomena