Audio frequency responseAudio frequency response

Audio frequency response

17. The steady state audio frequency response shall be nominally flat over the range of 50 Hz to 7 kHz.

Note 1 Appropriate audio filtering may be required at the input to the transmitter in order to meet the out‑of‑band and spurious emission requirements of guideline 8.

Note 2 Performance parameters are not specified in this standard. However, to obtain good monophonic reception from stereophonic broadcasts, the relative delay of L and R signals originating from the same source needs to be within acceptable limits on arrival at the modulator input, otherwise cancellation may take place in the M signal matrix. Such delays may occur in any section of the system where L and R signals follow separate routes ‑ such as in tape recorders and relay circuits, or in the acoustic paths to spaced microphones. Consequently, relative signal delay needs careful attention in program production and system engineering.