Measurement standards are available for many telephones and telecommunications devices worldwide. Measurements, which can be run singly or as a set, are started at the touch of a button. ACQUA automatically archives the results so that they can be printed out or analyzed after the measurements are complete. In addition, users can alter these measurement descriptors or create their own for further measurement and analysis possibilities. Standards relevant to North America include:
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Acoustic tests according to TIA/EIA-470-B
- Transmit and receive objective loudness ratings (TOLR
& ROLR)
- Transmit and receive frequency response
- Transmit and receive distortion
- Off-hook noise
- On-hook noise
- Receive noise
- Receive volume control
- Sidetone objective loudness rating
Acoustic tests according to TIA/EIA-IS-95, TIA/EIA-628 and TIA/EIA-IS-136-270-B
- Transmit and receive frequency response, analog and digital
- Transmit and receive audio sensitivity, analog and digital
- D/A converter and reconstruction filter: distortion
- RF sensitivity, analog
- Loudness contrast receive
- Loudness contrast transmit
- Acoustic echo path loss, analog and digital
Acoustic tests according to GSM 11.10, Section 30
- Sending and receiving sensitivity / frequency response
- Sending and receiving loudness ratings
- Sidetone Masking Rating (STMR)
- Listener Sidetone Rating (LSTR)
- Telephone Acoustic Coupling Loss (TAL)
- Echo Loss (EL) male voice, female voice, sine sweep
- Stability Margin
- Sending, receiving, and sidetone distortion
- Sending and receiving out-of-band signals
- Sending and receiving idle channel noise
Tests performed according to G.168-2002:
- Convergence and steady state residual and returned echo level tests
- Performance under conditions of double talk
- Leak rate test
- Infinite return loss convergence test
- Non-divergence of narrow-band signals
- Stability test
- In-band signaling
- Comfort noise test
- Facsimile test
VDA Specification for Car Hands-free Terminals
The Verband der Automobilindustrie (German Association of the Automobile Industry) used the expertise of HEAD acoustics to develop a detailed test specification for evaluating hands-free terminals in automobiles. Tests include:
- Delay
- Loudness rating
- Frequency response
- Idle Channel noise
- Discrimination against out-of-band signals in sending direction
- Spurious out-of band signals in receiving direction
- Acoustical echo
- Terminal coupling loss (TCLw)
- Echo level vs. time
- Spectral echo attenuation
- Switching characteristics: activation and attenuation range
- Attenuation range during double talk
- Detection of echo components during double talk
- Background noise transmission
- Ambient noise rejection
- Quality of background noise transmission
- Comfort noise injection
Voice over Internet Protocol
Acoustic tests according to TIA-810-A for handsets, headsets and hands-free terminals:
- Frequency response
- Loudness ratings
- Noise
- Receive comfort noise
- Distortion and noise
- Weighted terminal coupling loss (TCLw)
- Stability loss
- Long duration maximum acoustic pressure
- Short duration (peak) acoustic pressure
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